[John4C]

This is what I have in total for the ‘editions’

 

[4C🍀]

Alfa 4C US and Euro Chassis Differences

In creating the Alfa Romeo 4C, the company wanted to create an affordable exotic car and spiritual successor of the legendary 33 Stradale. To achieve a very high level of performance yet stay within the targeted price range, Alfa Romeo turned to the use of lightweight materials which were previously used only for military and aerospace applications. This keeps the weight of the car low and subsequently allowed the use of a lightweight and powerful four cylinder engine that guarantees excellent performance due to a high power to weight ratio. The fact that the engine is an off the shelf unit helps keep the car within the required budget.

The net results are a car that has a dry weight of approximately 1973 lbs in Europe and has a power to weight ratio of 8.22 lb/hp. In the US, the Alfa Romeo 4C will gain some 342 lbs, due to structural and equipment changes. Below we'll take a look at the chassis of the Alfa Romeo 4C along with some of the differences between the US and European model, with the help of Fiat Chrysler Automobiles and Alfa Romeo.

Applications of composite materials for manufacturing vehicle chassis have so far been limited to supercars costing at least $200,000, or vehicles with very limited road use.

The Alfa Romeo 4C is the first sports car made with extensive use of composite materials like carbon fiber and offered at the price of a mid-sized luxury sedan.
The engineers and designers of the Alfa Romeo 4C had to face many challenges:
• High cost of materials
• Difficulty mass production application
• High design complexity
Achieving these goals allowed the engineers to obtain two main advantages: a high level of integration between components (a single complex carbon part instead of many welded or bolted steel parts) and a considerable reduction of weight.
To understand the benefits provided by the use of carbon it is useful to compare this material with "conventional" alloys and metals.

The 4C is not only the first sports car in its class to offer a carbon fiber chassis, it also spearheaded improved production methods of a wide range of components that had been difficult to apply to mass production, due to the conventional use of pressed steel.

The Alfa Romeo 4C chassis is dominated by the central carbon fiber "tub", which houses the passenger compartment and includes the attachment points of the front suspension.

A strong high resistance steel roll-bar is positioned behind the passengers. This prevents passenger compartment deformation in the event of roll over. There are aluminium structures at both ends that protect against impacts, the rear aluminium structure creates a "cradle" for the engine and transmission, and includes the attachments of the rear suspension. These structures feature controlled collapsibility for safety.

To comply with US crash standards, both the front and rear aluminium structures and the aluminium tub have significant differences on the versions sold in the US market compared to the European versions.
The differences in the European and US versions of the front chassis are indicated below. (front view)

 

[4C🍀]

There are also differences between the European and US versions of the aluminium front chassis. The various colors indicate
the different characteristics of the US and European chassis.
• Parts in red: specific parts added.
• Parts in blue: parts in common but different thickness.
• Parts in yellow: same volume but different thickness.
• Parts in grey: parts in common
The following, on the other hand, are the differences relating to the European and US versions of the rear chassis.

 

[4C🍀]

Inside the Alfa Romeo 4C
The Alfa Romeo 4C is a stunning example of Italian design and engineering. Carrying on a legacy of making legendary high performance cars, the new Alfa Romeo 4C is poised to become an instant classic. The concept guiding Alfa Romeo was to create an "affordable supercar" with all the performance and soul that only an Italian performance car delivers yet be attainable by anyone with means. To achieve these results, the Alfa Romeo 4C has been built utilizing the most advanced and exotic manufacturing techniques.
Alfa Romeo has published a look at what goes into building the new 4C. It is posted below in its entirety for you to enjoy.

Alfa Romeo 4C: excellence made in Italy
Alfa Romeo unveils the technical contents and manufacturing secrets of the new 'compact supercar' which embodies the sportiness intrinsic to the 'Alfa Romeo DNA': performance and engineering excellence offering maximum driving satisfaction in total safety in addition to breathtaking style.

The Alfa Romeo 4C developers have combined the best technical and manufacturing competencies of two brands: Alfa Romeo and Maserati. Thanks to the internal synergies of the Fiat – Chrysler Group, the two carmakers were able to collaborate from the perspective of integrating Alfa Romeo's design roles and Maserati's manufacturing functions. The engineering and technological contribution of other Italian world-wide leaders in the component industry for high-performance sportscars has also been instrumental in achieving the result.

In particular, the Maserati plant brings in topmost quality and meticulously studied details reminiscent of hand-crafted work. As the birthplace of the world's most famous 'sportscars,' Modena and its surroundings are definitely the place that offers everything one may need to manufacture them: tradition, technology and know-how, but most of all, the same passion driving the team who conceived, designed and built the Alfa Romeo 4C.
Hi-tech materials for weight/power ratio for the supercar
• Contents and performance become an achievable dream.
• The most advanced mix of hi-tech materials combines exceptional stiffness and strength with a reduced specific weight.
• Weight/power ratio lower than 4 kg/HP and total dry weight of just 895 kg.
• The carbon fibre monocoque weighs just 65 kg.
The Alfa Romeo 4C was born from a clean slate and an idea or, rather, the clean state was the prerequisite for conceiving, developing and producing a new concept in the domain of sportscars, the "affordable supercar." The 4C was designed not only to be an exclusive car both for contents and performance, but also to become an achievable dream for Alfa Romeo fans all over the world. As a consequence, it was necessary to think in terms of limited production volumes, but still in the order of some thousands vehicles per year and, therefore, decidedly higher than those of the practically handcrafted production characterising this class.
The clean slate, which was initially free of design and manufacturing constraints, was soon assigned new parameters and presented with new challenges the first of which was a fundamental reference data point: a supercar weight/power ratio must be less than 4 kg/HP.
To achieve the right ratio, Alfa Romeo designers could have focused on horsepower (i.e.: increasing power and performance), but this would have impacted the purchase and maintenance costs, thus making the car significantly less affordable. They decided to go a different way; they reduced the car weight by using materials where lightness is combined with efficiency and by perfecting, sometimes even creating, manufacturing processes where high technology is joined to craftsmanship. In this way they were able to obtain a total dry weight of just 895 kg, a true record that makes the 4C one of the lightest cars in the world. The 4C is lighter than a city car and its weight/power ratio is less than 4 kg/HP.

In order to achieve this ambitious goal a lot of attention was devoted to the materials, each of which was chosen on the basis of its specific weight as well as on the chemical-physical, mechanical and technological properties that best fulfil the performance requirements and dynamic behaviour needs of a sports car. The 895 kg of vehicle weight mainly consist of aluminium, steel, lightened SMC and carbon fibre.
Carbon fibre
The secret of the 4C Alfa Romeo lightness and dynamic behaviour lays in the use of 10% carbon fibre, which represents 25% of the 4C overall volume. At present, carbon fibre is the material offering the best weight/stiffness efficiency. This is the reason why it was chosen for the structural function monocoque that makes up the central, load-bearing cell of the chassis. This solution combines reduced weight and excellent performance, and is already adopted for the most advanced supercargo; the monocoque weighs just 65 kg.

The monocoque was entirely designed by the Alfa Romeo specialised team and manufactured by Adler Plastic by means of an innovative manufacturing process capable of joining state-of-the-art manufacturing technology and the manual craftsmanship typical of the Italian artisans. Thanks to this approach, the 'pre-preg' technology inspired by the Formula 1 was also transferred to standard manufacturing, so much so that Alfa Romeo is the only brand capable to assure a production of over 1,000 pieces per year.
'Pre-preg' carbon fibre processed in an autoclave with vacuum bag marked the passage from piece design to material design. The monocoque has reached stress and dynamic behaviour response levels that would be unthinkable with different technologies and materials.
'Pre-preg' carbon fibres may be arranged in an optimum structural direction in relation to the forces, thus producing a result that metal would only yield if layers were overlaid, shims differentiated, and reinforcements added.

In addition, the autoclave polymerisation makes it possible to manufacture box-section structures in one phase, whereas normally the production and assembly of various components often made of different materials is required. One example would be the door post. In its standard steel version, the door pillar is comprised of approximately 6 pieces assembled to one another and to the car body at different stages of the manufacturing process.
If autoclave polymerisation is used, the door post is a one-piece component included in the load-bearing structure. The monocoque is a carbon fibre one-piece structure and, as such, it resists external stress with a clear advantage in terms of dynamic behaviour.

Aluminium
The choice of materials characterised by high torsional rigidity and reduced specific weight is a common element to all of the 4C structural parts. An example in this sense is the use of aluminium for the roof reinforcement cage and the front and rear frameworks. Just as in the previous case, some interventions aimed at reducing the weight and increasing the stiffness of the component were made in the component design and manufacturing phases. In particular, the designers replaced the traditional rectangular strut section with a newly designed section. In this way, they obtained lighter and, at the same time, safer frameworks. Frameworks are manufactured using the innovative 'Cobapress' process. Cobapress joins the advantages of fusion and the benefits of forging under press by compressing the aluminium alloy even further, thus removing any residual porosity. All this determines the component lightening to the advantage of its mechanical properties.

In addition, thanks to the use of seam welding processes, the welding is very precise, the components are not deformed and the filling of the gaps is excellent.
Aluminium also plays the main role in the hybrid-type front brake discs with aluminium bell and cast iron ring gear. This patented technology developed by SHW guarantees up to 2 kg of weight reduction per disc in addition to better braking. Furthermore, the sophisticated surface finishing technology by brushing increases grip and pedal feeling whereas the innovative release system between disc and bell guarantees a more comfortable and safer braking. The difference in the thermal expansion coefficients of cast iron and aluminium is compensated by specific steel radial pins that accurately transmit the braking action.

SMC (Sheet Moulding Compound)
Using SMC (Sheet Moulding Compound), a low-density and high resistance composite material, for the body has allowed a 20% weight reduction in comparison with the traditional sheet steel. The Alfa Romeo 4C is the first standard production car to achieve such a high percentage of low-density SMC: with a weight of 1.5 g/cm³ this material is decidedly lighter than steel (~7.8 g/cm³) and aluminium (~2.7 g/cm³), besides being more malleable. This feature has allowed for the styling and design freedom that were necessary to create a true, instantly recognisable Alfa Romeo. Moreover SMC is a stable material which, unlike aluminium, does not strain in the event of minor impacts, has high resistance to chemicals and atmospheric agents, and also disperses noise very well to the advantage of acoustic comfort.

Finally, low-density SMC guarantees a good functional integration of the parts; this in turn entails a reduction in the number of components and operations, and requires shorter assembly times, thus lowering production costs.
PUR-RIM (injected polyurethane)
The PUR-RIM (injected polyurethane) was chosen for bumpers and wings for the same reasons described above. It is a lightweight material (it weighs 20% less than steel) suitable for creating very complex design elements, such as the 4C wing, and for keeping an ideal cost/production volume ratio.
Windows
In the search for the lowest possible weight, no material was ignored, not even glass. In the case of glass, the lightening was obtained by adopting a real silhouette-thinning approach: all the window glasses are on average around 10% thinner than those normally fitted on cars; this allows for an average weight reduction of 15%. The windscreen in particular is only 4 mm thick. This is an extraordinary result especially in consideration of the fact that this particularly aerodynamic shape is difficult to obtain on such thin glass.

 

[4C🍀]

Engine

• Direct-injection 240HP 1750 Turbo Petrol engine
• Aluminium block and specific intake and exhaust systems
• Torque and specific power values lead the class: over 200 Nm/l and 137 HP/l
• Top speed 258 km/h and from 0 to 100 km/h in just 4.5 seconds
• Direct petrol injection, dual continuous variable valve timing system, turbocharger and 'scavenging' system that eliminates 'turbolag'

The new '4 cylinder' 1750 Turbo Petrol with direct injection at 200 bar that achieves performance of absolute excellence is making its début on the Alfa Romeo 4C. Torque and specific power set new records for this size of engine at over 200 Nm/l and 137 HP/l, respectively, while maximum power of 240 HP (176 kW) is reached at 6000 rpm. The maximum torque of 350 Nm ensures its extraordinary elasticity and sportiness since it is maintained constant between 2100 and 4000 rpm, but 80% of the torque is already available at just 1800 rpm.
Fitted out like this, the compact supercar registers exceptional results both during pick-up and when accelerating. The Alfa Romeo 4C goes from 0 to 100 km/h in just 4.5 seconds and develops a top speed of over 250 km/h. Driving pleasure is magnified by the full, rich sound of the exhaust, where the low frequencies and classic roar have been emphasised. This impressive level of performance has been achieved with minimum impact on the environment. Thanks to multiple injection control and advanced anti-friction and energy loss reduction systems, the emissions of the Alfa Romeo 4C fall well within the strict limits of Euro 6.
Aluminium block and specific intake and exhaust systems
The Alfa Romeo 4C 240 HP direct injection 1750 Turbo Petrol engine implements an innovative aluminium block and specific intake and exhaust systems which have been optimised to enhance the sports appeal of the car even further. In addition, it boasts cutting-edge technical solutions including direct fuel injection, dual continuous variable valve timing system, a turbocharger and a revolutionary scavenging control system that gets rid of any turbo lag.
In line with the search to achieve as much lightness as possible, the 4C's engine weighs 22 kg less than that of the Giulietta Quadrifoglio Verde. Helping reach this goal is the aluminium block with die-cast inserts that not only is lighter, but also contributes toward improving the rigidity of the engine and reducing its vibrations (fewer vibrations were obtained also by using a crankshaft with eight counterweights, which allows the maximum rpm to be increased).
To optimise performance, emissions and oil consumption, the cylinder head intake ducts were redesigned, as were the cylinder liners, which today are made of a special cast iron that is thinner. The pistons have new segmenting with reduced load.
'Scavenging' technology
The Alfa Romeo 4C's advanced 'scavenging' technology maximises torque at low engine speeds and delivers more power in response to driver input. The control unit determines valve overlap times and angles with great precision to create a through-flow of air from the inlet manifold to the exhaust manifold. By improving the scavenging of the combustion chamber, this direct flow increases combustion efficiency and turbine speed and reduces turbo-lag.
Turbocharger
To complement the 'scavenging' technology, the engine is also equipped with a new generation turbocharger and a pulse converter exhaust manifold that exploits pressure waves to boost torque at low engine speeds. The manifold and the turbine are made from microcast steel and designed to operate at very high temperatures (over 1000°) - a pre-requisite to low fuel consumption on medium-high speed motorway journeys. The wastegate valve is another helpful device for engine efficiency. This adjusts turbo pressure using control logic which varies to suit driving conditions, minimising pumping losses.
After-Run Pump
Like all top competition cars, the Alfa Romeo 4C uses an automatic cool-down system to protect its turbocharger. Switching off the engine would normally cause the immediate stoppage of oil circulation, leaving the oil in the turbocharger to stagnate at very high temperatures. The thermal stress suffered by the oil in this way causes a loss of lubricating capacity and also leads to the formation of residues that can damage the engine. To prevent this, Alfa Romeo has introduced an after-run pump. This electric pump is automatically controlled by the ECU and keeps oil circulating through the turbocharger until it has cooled sufficiently.
Gearbox

• 6-speed Alfa TCT dual dry clutch transmission
• New gear change management software
• New Launch Control for standing starts

Power alone could never deliver the superb performance of the Alfa Romeo 4C. An advanced transmission system is needed to control it. The 4C is equipped with an Alfa TCT 6-speed gearbox with dual dry clutch, a solution that combines the instant power of a sequential shift with all the convenience of an automatic.
A true point of reference of the category due to its low weight and extreme speed of actuation, the gears can be changed in sequential mode using the shift paddles located behind the steering wheel. In detail, the transmission works like two gearboxes in parallel, each with its own clutch. The next gear is selected while the previous gear is still engaged, eliminating all discontinuity in power transmission.
The Alfa TCT gearbox has been optimised for the Alfa Romeo supercar. The 4C's special clutch features all-new control software that ensures the fastest possible gear shifts under all conditions. Gearshifts are more aggressive in the sporting performance modes, and drivers can clearly feel the new gear engaging, as on a racing car. On bends, on the other hand, gearshifts are completed in the smoothest way possible to avoid reducing stability.
The Alfa Romeo 4C is also fitted with Launch Control for easy high performance standing starts. Launch Control is activated by pressing the brake pedal while pushing the accelerator pedal all the way down and squeezing the paddle on the left of the steering wheel. As soon as you release the brake, the system automatically controls the gearbox, traction and power to maximise acceleration.

Performance

• From 0 to 100 km/h in just 4.5 seconds flat and 258 km/h of top speed
• Deceleration peaks in the range of 1.2 g and lateral acceleration peaks over 1.1 g
• New Alfa DNA selector with 'Race' mode

You look at it and you like it: wide tyres, low ride and a well-balanced aggressive style. It is beautiful. But that's not all. You hear the engine and it excites you with its full and convincing mechanical sound. So there is nothing left to do except sit down behind the wheel, engage first gear and give yourself time and pleasure, because that is what it is all about: becoming familiar with direct controls immediate responses.
The Alfa Romeo 4C offers even the most expert driver extraordinary performance and sensations: from 0 to 100 km/h in just 4.5 seconds flat, 258 km/h of top speed, deceleration peaks in the range of 1.2 g and lateral acceleration peaks over 1.1 g. All this is also achieved with a balanced weight distribution, with 40% on the front axle and 60% on the rear.
Something else that is essential is keeping the unsuspended mass as low as possible. In a hypothetical run around the track, it is necessary to ensure that the wheels grip the terrain for as long as possible, which is to the full benefit of road hold and the longitudinal and transverse accelerations.
If these principles bring about the excellent dynamic qualities of the 4C, there is one characteristic enduringly connected to every Alfa Romeo: ease in recognising one of the brand's models through other senses. So it is not only eye-catching, but the sound of the engine - which has been emphasised with low frequencies and the classic roar of the exhaust - and the enveloping seat designed so that the driver 'feels' the car also create its unique identity.
'Body' perceptions are felt inside and even more so - with an added thrill - at the wheel. The brake, for example, can be modulated when loaded to get the necessary feedback even in the most demanding braking situations. Steering, which has to convey as much 'feel' as possible is unassisted, progressive and 'genuine', and the accelerator is ready to handle exits from curves with as much acceleration as possible.
Like all the latest-generation Alfa Romeos, the 4C as well is equipped with the DNA selector. This device lets the driver change the car's temperament to adapt it to the conditions it is subjected to at the moment.
In addition to the three settings available up until today - Dynamic, Natural and All Weather - the device built for the Alfa Romeo supercar has a fourth mode: 'Race', designed to enhance the driving experience on a track even further.
Race is the most extreme performance mode, and is engaged by moving the mode selector to 'Dynamic' position and holding it there for 5 seconds. Alfa Race mode puts you in total control of your car under race conditions. By minimising the interventions of electronic systems, it leaves you, the driver, in complete control. In this situation, ESC stability control remains inactive and only intervenes to ensure stability under harsh braking. ASR does not intervene either on the acceleration or braking, leaving you to control traction through the accelerator pedal alone. Alfa's Q2 electronic differential control system, on the other hand, remains active, as it is essential to permitting fast exits from bends.
Performance changes with the 'Dynamic' mode, which configures the car to deliver great driving performance. Engine control parameters are configured to respond quickly to accelerator input and the Alfa TCT gearbox selects a rapid action program to reduce gear shift times by up to 25%. The ESC system permits a certain angle of drift and only intervenes if steering wheel position and drift angle could put the car at risk.
Press the Alfa DNA selector to switch to 'Natural' mode, designed for everyday use. Gearshift parameters are configured for maximum comfort and smoothness. In manual mode, the Alfa TCT transmission makes up for loss of driver concentration. The Auto-Up function shifts up to the next gear when engine speed approaches the permitted limit, while the Auto-Down function shifts down as soon as engine speed falls below 1000 rpm. Finally, the Alfa Q2 differential operates in soft mode and only cuts in if one of the rear wheels suffers a significant loss of grip.
Finally, all you have to do is switch the selector to 'All Weather' mode to ensure maximum safety under adverse weather conditions. With this setting the car responds to accelerator input very gently. The ASR system selects special engine and brake control logic and, in the event of loss of grip, modifies power to match road speed and prevent skidding that could otherwise be difficult to control.
Mechanics

• Sports suspension with superimposed wishbones and advanced MacPherson
• Ventilated disc braking system: from 100 to 0 km/h in just 36 metres
• Different diameter tyres: 17"-18" or 18"-19"
• Steering ratio: 90% of bends without ever taking your hands off the steering wheel

In addition to its absolute performance, the handling of the Alfa Romeo 4C makes it one of a kind. You can fully enjoy the car in all situations, and not only during extreme use on the track, thanks to its feel and ease of driving at top levels. Sport suspensions, self-ventilated brake discs, different diameter tyres and direct steering: an advanced ride control system able to keep weight down to a minimum has been designed for the 4C.
Sports suspension
The suspension adopts race-derived technical solutions to optimise performance and deliver unrivalled driving pleasure. A superimposed wishbone system is used on the front of the Alfa Romeo 4C. The wishbones are secured directly on the monocoque and comprise a coaxial spring-shock absorber assembly, tubular control arms and anti-roll bar, all lightweight and efficient.
An Advanced MacPherson geometry has been adopted on the rear to ensure superb road holding and driving fun, even in the most extreme manoeuvres. More specifically, hysteresis of the suspension has been improved with the side-load spring and the support plate of the shock absorber spring at the same time forming the upper constraint of the strut. In this way both height from ground and weight have been reduced, all to the benefit of grip and precision, even at high speeds.

Braking system
The braking system of the Alfa Romeo 4C excels in terms of effectiveness and reliability, even in the most extreme driving conditions. The car can be braked from 100 to 0 km/h in just 36 metres. Merit for this goes to the hybrid self-ventilating, perforated discs complete with Brembo caliper on the front with aluminium bell and cast iron ring gear. This is technology patented by SHW and it guarantees up to 2 kg of reduced weight per disc and improved braking. Moreover, the sophisticated brushed surface finish technology increases grip and feel of the pedal, while the innovative release system between disc and bell provides more comfortable and safer braking. Special steel radial pins handle the difference in thermal expansion between cast iron and aluminium and accurately transmit the braking motion.
Different diameter tyres
The search for the greatest possible grip also led to the selection of different diameter tyres, 17"-18" or 18"-19", larger on the back to satisfy the need for greater grip on the axle where the traction works.

Steering
As it is entirely mechanical, therefore without power steering, steering with plasticised links contributes to limiting the total weight of the car and ensures a direct driving feeling for the driver. The steering ratio (16.2) is also such as to allow 90% of bends to be taken without ever taking your hands off the steering wheel.

 

[4C🍀]

Interior
The interior of the Alfa Romeo 4C is the result of an in-depth study of anthropometric and ergonomic parameters that established a relationship between the sports layout of the car and features that form a 'continuity' with the design of the body. It is a design concept in which the various elements - dashboard, instruments and seats - follow specific driver and passenger usability and comfort criteria.
Definition of the interior took on particular importance when configuring the carbon fibre 'monocoque' cell. This veritable 'monolithic core' led to a rational organisation of the main construction elements in keeping with the principle of integrating parts and optimising weights. Initially focused on arranging controls and instruments so they are turned toward the driver, this approach actually simplified construction in terms of assembly processes and separation into subassemblies when industrialising the project.
The climate control system ducts are integrated with the entire dashboard block, which contains a supporting 'technical spider' structure inside the mould. Consisting of a thermoformed shell like those found on limited edition supercars, the dashboard is designed to make using functions simple and reaches its zenith in the concept of extreme driver-orientation, thanks to digital instruments and gear shift controls located on the appropriately shaped steering wheel.

The cockpit, which powerfully suggests the world of motorcycle racing and race cars, brings together all information necessary to drive and control the car. All readings are visible on the instrument panel, comprising an original digital display, containing all the control functions for the Alfa Romeo supercar.
This formal construction simplification in terms of reducing the number of components and placing the various parts in clear view meets the goal of concentrating the relationship with the car's interior on the experience of driving. User-friendly and formal importance was given to positioning the TCT transmission selector, activated by buttons on the tunnel console, the gear change levers on the steering wheel, and the DNA system selector for changing the operating parameters of the engine and the chief mechanical and electronic devices.

With regard to the selection of materials, the Alfa Romeo 4C project is a perfect synthesis of the brand's values. It is a combination of advanced technology and dynamism, sportiness and performance, and tradition and modernity. The lines, shapes, materials and colours emphasise this desire to take centre stage: the pride of being an Alfa Romeo. The material is not intended as a covering, but as an enhancement of the external and internal skin, volumes and, where possible, as a visible structure. The material is the very essence of the structure.
The aesthetic choices are based on technical and natural materials, and not appearance, but substance. The interior space is minimal and 'naked' in its treatments and finishes. The environment is dark black, embellished only by a few metal details with an aluminium effect. The real protagonist is carbon. As it is a structure, it is found both inside and outside the car in an aesthetic continuum and conveys technicality and lightness at the same time.
The seats, with a composite structure, ensure the perfect feeling of the road that the driver gets, thanks to the possibility of finding an ideal driving position while guaranteeing comfort even in everyday use. In detail, the seat upholstery ranges from technical fabrics with high performance and robust nylon yarns to natural leathers in the colours of Alfa Romeo tradition: red for sportiness and "dinamica", a polyester microfibre with a soft and adhesive touch to keep grip on the seat, as well as on the road. Also the internal 'asphalt type', 3D and 'rough' grains call the real subject matter to mind: contact with the road. Finally, the pedal unit and footboards for driver and passenger are made of aluminium, in this way highlighting its sports character down to the smallest detail.

Architecture

• Two bucket seats, rear wheel drive with a mid/rear mounted transverse engine
• Weight distribution: 40% on the front axle and 60% on the rear

Driving pleasure is the result of carefully balanced design. Rear wheel drive and a centrally mounted engine: the architecture of the Alfa Romeo 4C is typical of competition cars in which perfect weight distribution is the primary objective.
The Alfa Romeo 4C has rear wheel drive to make full use of the dynamic advantages afforded by this configuration. Rear wheel drive gives better grip under acceleration, when engine power throws weight towards the rear of the car. Rear wheel drive also lets you enter curves at higher speeds, delivering a far more intense driving experience.
The aluminium engine is centrally mounted. This significantly reduces weight as it eliminates the need for a propeller shaft and optimises weight distribution - 40% on the front axle and 60% on the rear - by concentrating mass near the centre for crisper handling.
Aerodynamics

• A negative Cz contributes towards achieving increased stability at higher speeds
• Cx equal to 0.34, the best value among cars with negative lift

Having defined the 4C's architecture, Alfa Romeo engineers started to search for the most suitable materials for this solution. Aluminium, steel, SMC and carbon fibre were chosen for their ability to combine lightness and efficiency. In this way a total dry weight of only 895 kg was achieved. This record makes the Alfa Romeo 4C one of the lightest cars in the world.
After choosing the materials, the designers worked on all external and internal flows of the car, paying close attention to every detail necessary to decrease the creation of vortices and at the same time to ensure cooling of the engine compartment. On top of this special design of the rear and lower underbody air intakes and over 200,000 hours of optimisation in the wind tunnel and on the track were added. The final result is a Cx equal to 0.34, the best value among cars with negative lift.
The Alfa Romeo 4C achieves maximum aerodynamic efficiency levels, guaranteeing a negative Cz which, as in racing cars, contributes towards achieving increased stability at higher speeds thanks to the negative lift.

 

[4C🍀]

Alfa Romeo 4C Sets Record at Nurburgring

Alfa Romeo released a video of its new 4C sport car setting a record laptime at the Nürburgring circuit. Driven by the expert driver and journalist Horst von Saurma, the Alfa Romeo 4C completed one lap of the Nordschleife section in just 8'04'', a record for cars under 250 HP.

This time beats a slew of more powerful cars. Take a look at how the Alfa Romeo 4C stacks up against the competition:

8:04 - Alfa Romeo 4C, 240 PS
8:05 - Porsche Cayman S, 325 PS (sport auto 06/13)
8:05 - BMW M3, 420 PS (sport auto 12/07)
8:05 - BMW M5, (5th Gen)560 PS (sport auto 09/12)
8:05 - Mercedes CLK 63 AMG Black Series, 507 PS(sport auto 03/08)
8:05 - Ferrari 575M Maranello F1, 580 PS(sport auto 12/02)
8:05 - Porsche 997 Carrera S, (WHEELS 06/04)
8:05 - Porsche 997 Carrera S, 355PS(sport auto 05/05),
8:06 - Porsche Cayman R, 330 PS(sport auto 10/10)
8:09 - Honda NSX-R, 320 PS(sport auto 08/02)
8:10 - Chrysler Viper GTS, 411 PS(sport auto 10/97)
8:10 - Porsche Cayman R, 330 PS(sport auto 10/10)
8:10 - Porsche Boxster S, 310 PS
8:11 - Porsche Cayman S, 295 PS(sport auto 07/05)
8:12 - Porsche 993 Turbo (sport auto 03/97)
8:41 - Lotus Elise SC, 220 PS (AutoBild sportscars 08/08)

 

[4C🍀]

Alfa Romeo 4C Spider (may 2015)

 

[4C🍀]

 

[4C🍀]

 

[4C🍀]

 

[4C🍀]

 

[Anglospider]

Thanks for posting this, it makes for good reading.

My own Spider is seriously slow, though, I can't get anywhere near 257mph . Class Action anyone ?

 

[4C🍀]

On the Alfa Romeo 4C it was decided not to extreme the power, but rather to contain the weight: 895 kg empty for 240 hp (1005kg with half tank and liquids), therefore, a weight-to-power ratio of less than 4 kg/hp. A fact that guarantees maximum agility and performance from supercars.

In just under 4 meters in length, 2 meters in width and 118 cm in height, ultra-light materials, such as carbon fiber, aluminum and composites that make the car even more dynamic, are located. Snapping, powerful and evolved. On board 4C, cutting-edge materials, innovative processes and Alfa Romeo values create a true concentrate of efficiency.

Carbon, Aluminum and Plastics

Carbon fiber is used to make the central cell that houses the cockpit: a natural element that offers considerable advantages over traditional materials, defined as “isotropic” because they have the same strength characteristics in all directions. Carbon fiber, anisotropic, can be processed to ensure the unidirectionality of the fibers and make an element even 5 times more durable.

In the case of the 4C, which we remember, totaled the record at the Nurburgring of 8min and 04sec, the weight the total weight of the “carbon” is only 65kg. The technology used for the realization of the monocoque is called pre-preg (pre-impregnated and formed from unidirectional fibers) and is combined with a processing called “cura” that allows to obtain a single piece, without assemblies: it is a Dallara patent used by the latter in the highest series and at its first use on non-F1 cars The entire architecture is the first example of the application of structural solutions of this type on a vehicle intended for large volumes: until now, in fact, these solutions had only been used for super-sport cars such as the Lamborghini Aventador or the Ferrari LaFerrari.

The aluminum, solid and incredibly light, gives shape to the engine crankcase, the engine itself and the two structures that front and rear protect the passenger compartment from shocks. Aluminum, in weight reduction, plays an important role equal to that of the carbon monocoque: it represents 38% of the total weight of the car. This material is used according to a process called Cobapresswhich combines the advantages of casting with those of forging obtaining very high density parts.
Behind the occupants, on the other hand, a high-strength steel roll-bar prevents deformation in the event of rollover.

The bodywork is made entirely of SMC-type composite material (in this case a glass fiber reinforced polyester – specific gravity of 1.5 g/cm³ compared to 2.7 g/cm³ of aluminum) with low density and high strength. The use of this material gives benefits in terms of weight reduction (-50% compared to a light alloy).

The search for lightness therefore takes place both on the bodywork and on the chassis: the bumpers are made of injection polyurethane (commercially called PUR-RIM) which allows a weight reduction of about 20% compared to traditional bumpers. The windows are 10% thinner and 15% lighter than traditional ones, the windshield is only four millimeters thick.
Composite materials, which have so far been difficult to apply to series production, complete the innovative structure of the car, as they guarantee greater stability than aluminum and a weight reduction of 20% compared to sheet metal.

Remove the superfluous to save weight

To create a light car, in artisanal production and with a relatively low cost, the Alfa Romeo has rained the use of solutions that have always characterized supercars and small manufacturers of artisanal cars.
Not being able to save on the technical quality of the car and on the components, and having to keep the affordable price and not incur excessive production and engineering costs, Alfa Romeo has chosen this traditional solution: the philosophy of eliminating the superfluous and reusing components already on the market.

The car and its components are made solely of lightweight and ultra-light materials and all unnecessary parts are eliminated. The instrumentation is entirely digital, therefore missing heavy tachometers and odometers replaced by virtual graphics, some carbon fiber parts of the body are visible, without internal coating. The dashboard is a light cast of one-piece die-cast polymer material where Mito and Juliet's switches are incorporated. The steering is without servo assistance (nether electric, nor hydraulic), for greater feedback, even if in the parking lots the 'weight' is felt a lot.

For the realization of the car, some alternative solutions to the traditional ones on secondary or purely aesthetic components were used. The car is not equipped with a traditional fairing light lighting system, in which standard spotlights are incorporated, without a specific design (similar for example to the Pagani Zonda), to these are added a distinctive composition of LED lights, always incorporated with the same system. Mast and shell of the exterior rearview mirror are of Grande Punto derivation, the gear selection buttons is Abarth 500 origin.

Optimal mass balance

The pleasure of driving is the result of a precise design balance. Rear-wheel drive and engine in a central position: for the Alfa Romeo 4C a construction architecture typical of sports cars, where the goal to be achieved is a rigorous weight balance.

The Alfa Romeo 4C chooses rear-wheel drive and takes full advantage of all the dynamic benefits of this configuration. Unloading the power on the rear wheels means better grip during acceleration, when the engine start weighs down the rear of the car. But not only that: the rear-wheel drive allows a faster entry into corners, giving the rider an even more intense driving pleasure, including power oversteers: the joy of every enthusiast. A Torsen type self-locking differential would have been appreciated, as sometimes the exuberance of the engine cannot be 'unloaded' on the ground.
The aluminum engine is centrally positioned. This means lightening the car, which does not need a drive shaft, and optimizing the weight balance (front 38% – rear 62%) making it more snappy thanks to the central mass, and sometimes slightly understeer if you make a mistake when inserting at the curve.

The engine: how much better FCA offers on the four-cylinder

The 1,750 turbo gasoline is the state of the art technology applied to an internal combustion engine. Alfa Romeo technicians have transformed it into an even more aggressive and efficient propulsion unit: 4 cylinders, aluminum crankcase and structure, new generation turbocharger, direct injection at very high pressure, double continuous phase variator, Scavenging technology and dual clutch gearbox allow the 1,750 engine to reach new levels of sportiness.

The values of torque and specific power are at the top of the category, the maximum power of 240 hp is already reached at 6,000 rpm and 350Nm from 2,200 to 4,250 rpm (80% already available at 1700 rpm): data that demonstrate extraordinary elasticity and dynamism. Outstanding results in both recovery and acceleration: Alfa Romeo 4C reaches 100 km/h in 4.5 seconds and develops a top speed of 258 km/h. Moreover, thanks to the control of multiple injections and the systems to reduce friction and energy losses, the emission value of Alfa Romeo 4C is so low that it meets the strict limits of the European Euro 6 legislation. The weight of the engine is 135 kg, 24 less than the cast iron unit of the “old” version.

On the 1750Tbi, Scavenging technology maximizes torque at very low revs, ensuring greater responsiveness to the driver's demands. Technically, the control unit defines with extreme precision the angle and crossing times of the valves, allowing a direct inflow of air to be generated from the intake manifold to the exhaust manifold. This inflow improves both the washing of the chamber, increasing the combustion efficiency, and the turbine speed, decreasing the turbo-lag phenomena.

In combination with Scavenging technology, the engine is equipped with a new generation turbocharger, with a Pulse Converter type exhaust manifold that optimizes the exploitation of pressure waves to increase torque at low revs. Both the manifold and the turbine are made of cast steel to be able to operate at very high temperatures (over 1000°): an indispensable condition to reduce consumption during highway driving at medium or high speeds. Another useful element to the efficiency of the powertrain is the Wastegate valve, which controls the pressure of the turbo according to different logics depending on the dynamic setting of the car, limiting pumping losses.

Like all super sporty cars, 4C uses an automatic cool-down system to protect the turbine. Normally the shutdown of the engine causes the immediate stop of the circulation of the oil that is stagnating in ducts at very high temperatures: the thermal stress causes the oil to lose its lubricating capacity and leads to the formation of residues that risk damaging the engine. To avoid this phenomenon, the After-Run Pump was introduced, an electric pump controlled by the control unit that keeps the circulation in the turbo active by automatically completing the cooling procedure.

Refined suspension and screaming braking

A suspension scheme that uses technical solutions from the world of competition, to optimise performance and offer unparalleled driving fun. For the front, the Alfa Romeo 4C adopts an overlapping triangle system that allows the pilot to directly feel the feedback of the wheels, without filters, in this way you can control the angles of camber and convergence optimally, for more precise feedback and a better seal (1.1g of lateral acceleration). For the rear, advanced Mc Pherson suspensions that ensure maximum road holding even in the most extreme maneuvers. For both, aluminum and high-strength steel.

Braking system ready for the most intense uses of performance on the track: perforated self-ventilating discs complete with Brembo caliper on the front, to go from 100 to 0 km/h in just 36 meters, record for sports cars, to the levels of the best supercars (1.2g of maximum delight). The brake tracks are made of cast iron while the bells are in lighter aluminum, to save about 2 kg on each wheel, as well as to improve braking without resorting to expensive composite brakes.
And because the car really guarantees maximum grip, avoiding skating in any climatic conditions, tires with differentiated diameter, 17′′-18′′ or, optional, 18′′-19′′, larger tires on the rear for vehicle dynamics were designed.

On-demand electronics: Alfa DNA

Optimize the operating logic of electronic systems to obtain the type of performance best suited to the circumstances. With the simple press of a finger you can choose the character of the car: docile and prudent (All weather), balanced and performing (Natural) or snappy and aggressive (Dynamic). This since 2008 is the function of the Alfa D.N.A. selector. On board the Alfa Romeo 4C the same device is completely rethought to meet the needs of a highly sporty supercar.
So a new mode is added to the three existing configurations: Alfa Race.

All weather
To be activated when the weather conditions are adverse to make the march safer. In this mode the car gives a particularly soft response to the accelerator controls. In particular: the ASR device adopts a specific logic for the management of brakes and engine and, in case of loss of grip, the power is calibrated according to the speed of the car in order to prevent skidding that would be difficult to control.
Natural
The configuration designed for everyday use: the gear shift management is gear-oriented and eliminates any vibration at the engagement. In manual mode, the Alfa TCT gearbox prevents driver distractions: with the Auto-Up function it switches to the upper ratio when the number of revolutions comes near the limiter, with the Auto-Down function it enters the lower ratio when the engine drops below 1,000 rpm. Finally, the Alfa Q2 differential works softly and only intervenes when one of the rear wheels loses grip in a noticeable way.
Dynamic
This mode prepares the car for great driving performance: the engine adopts a specific calibration to respond immediately to throttle stresses, while the Alfa TCT gearbox activates a quick-tachment program that reduces shift times by up to 25%. The ESC allows the driver a certain angle of skid and is limited to intervening only when, by analyzing the position of the steering wheel and the angle of yaw, the car is in a situation of potential danger.

Alfa Race
It is the most extreme driving setting, which is inserted by placing the selector in Dynamic mode and holding it down for a few seconds. Perfect to use on the track when it is necessary to have absolute control of the car: Alfa Race limits the intervention of electronic systems to a minimum, leaving the initiative to the driver, it is recommended to use only for expert hands. In this case, the ESC stability control remains inactive and is limited to preventing imbalance in the most intense braking. The ASR does not intervene on the power or the brakes, so that the traction is managed exclusively through the accelerator pedal. Instead, the Alpha Q2 differential remains active, which is essential for maximizing the output speed from the curves and the 'brushed' are guaranteed.

TCT Dry Dual Clutch Gearbox

It is not only the power that sets the level of performance of the Alfa Romeo 4C, to manage the cues of the engine you need an evolved transmission system. Therefore, the car is equipped with the 6-speed gearbox with Alfa TCT dry dual clutch: a solution that combines the immediacy of the sequential and the comfort of the automatic. It is a system that works as two gearboxes in parallel, each with its own clutch, where the engagement of the next gear takes place while the previous one is still inserted, eliminating the delivery gaps.

The Alfa TCT gearbox has been modified ad hoc to board the Alfa Romeo 4C. In this particular version the change management software is completely new and guarantees maximum speed in the selection of the ratio, in all conditions. In the more sporty modes the change is more aggressive and there is a slight backlash due to the engagement of the new gear as in competition cars. In corners, however, the gears follow one another as smoothly as possible so as not to affect the stability of the vehicle.
The Launch Control system for the management of standstill starts has also been introduced on 4C. By simultaneously pressing the brake and the accelerator to the end of the stroke and pressing the paddle to the left of the steering wheel, the control unit activates the Launch Control and launches the speedometer towards 6,000 lap waiting for the Start: as soon as the brake is released, the system intervenes on gearbox, traction and power control in order to maximize acceleration.

 

[4C🍀]

The factory in Modena: excellence of Made in Italy

Alfa Romeo has chosen to produce 4C in Modena, creating a dedicated unit within the Maserati factories. Here the watchwords are advanced technology and craftsmanship of the highest profile: a combination that allows you to create exceptional cars with extraordinary technique and care.
Along the assembly line of 4C it is the people who make the difference. The specialists working on the new Alfa Romeo, after 500 hours of ad hoc training, followed the last stages of the car's development for 10 months: a background that allows them to have an extremely in-depth technical knowledge. For each car, the technicians personally follow each individual phase of assembly and, at the end, dedicate themselves to the careful quality controls, aimed at ensuring the perfect functionality of all the components. Finally, the car is entrusted to an experienced test driver who checks its dynamic performance in different driving situations.

Italian excellence in the automotive sector can be found in every single element of the car. The most recognized Italian companies in the sector, already supplying the largest supercar companies in the world, have been involved in the realization of Alfa Romeo 4C:
– Adler Group: manufacturer of the carbon monocoque;
– Emarc: manufacturer of the roll bar and all aluminum supports;
– IMR: Composite bodywork manufacturer.

For this reason Alfa Romeo 4C represents Made in Italy excellence in the automotive sector. We hope that Alfa continues to make the Self-passionate of Today and Tomorrow dream, as it is doing with the 4C.

 

[Alfanut]

No, I haven’t read it all yet but I remain flabbergasted at how under-appreciated the 4C is even by some Alfisti as well as some (past) owners. She is a very special gem. Thank you for posting, @4C🍀.

 

[4C🍀]

From news auto 🇮🇹

ALFA ROMEO 4C, WHY LIKE IT, HISTORY AND PRICES

History of the Alfa Romeo 4C

The Alfa Romeo 4C was first unveiled at the Geneva Motor Show in 2011 as a concept car, arousing great enthusiasm among car enthusiasts. Subsequently in 2013, also at the Geneva Motor Show, the 4C was presented internationally as a car intended for marketing. In the same year production officially began, with the 4C becoming available on the market, immediately a strong interest.
This car marked the return of Alfa Romeo to the sports car segment after a long period of absence. In 2014 it was presented at the International Auto Show in New York anticipating its launch on the North American market that took place the same year.
In 2015, the 4C Spider version came alongside the Coupé version. Note that the American version of the 4C had significant changes on the carbon fiber bodywork now reinforced with aluminum supports and a consequent increase in weight, changes attributable to the various safety regulations of the NHTSA regulator. Production of the car officially ended in 2020.

Alfa Romeo 4C | HOW IT'S MADE

There has been a lot of talk about the Alfa Romeo 4C, the Italian response to the planetary success of the Lotus Elise phenomenon. Initially it was supposed to be born under the name of Ferrari Dino, then under the sign of the scorpion Abarth and, finally, it came out as Alfa Romeo as part of the relaunch plan that was supposed to return large cars under the sign of the Biscione.
In spite of the rumors of the usual uninformed, the wonderful carbon fiber frame developed in Dallara had nothing in common with that of the KTM X Bow.

Alfa 4C carbon frame

The frame of the Alfa 4C consists of a carbon tank produced with Pre Preg technology (the same as the F1, to be able to orient the fibers so as to be optimally arranged with respect to the forces acting on the piece) weighing 65 kg that acts as a central element and cockpit; it provides two additional aluminum frames, front and rear, made with Cobapress technology (for better mechanical and lightness characteristics) to which are anchored steering and independent suspension with quadrilaterals deformable at the front, engine/gearbox and McPherson suspension at the rear.

Around this miracle of technology was built a wonderful bodywork in SMC composites (Sheet Moulding Compound, lighter and easier to work with aluminum), full of quotes from the greatest masterpieces of Alfa Romeo and the history of the automobile such as Alfa Romeo 33 Stradale Scaglione and Giulia TZ2.

The bumpers, on the other hand, are made of polyurethane, the windows are ultra-thin. The wide snout with the silhouette of the Alfa shield, the waistline that draws the sinuous lateral profile of the car body, the splendid side air intakes, the tail...everything is perfect in the 4C!

You can waste hours trying to discover new details in this masterpiece of Italian style. The tail, for example, is fantastic with the two classic-style circular optical groups, the air vent and the lower diffuser that closes the flat bottom of the 4C. Too bad that the engine, visible under the rear crystal, is a little too covered by the plastic cover. The choice of colors also enhances the shadow games that give this machine the appearance of a sculpture on 4 wheels.
Just under 4 meters long, it looks bigger than it actually is.

Alfa Romeo 4C | INTERIOR

The interiors are the mecca of every sports car enthusiast. Instead of the aluminum of the Lotus Elise, on the 4C you can see the carbon of the precious frame. Despite being a naked and pure sports car, it has an excellent level of finish: the dashboard is beautiful, with the compact and complete instrument cluster and the shaped steering wheel, and the paddles of the dual clutch gearbox are optimally positioned.

Then you look down and reach the Nirvana of every lover of beautiful cars: the pedalboard. It is an aluminum sculpture, infulcrated in carbon.

Inside, the Alfa Romeo 4C offers a minimalist, but driver-oriented environment. The passenger compartment is designed with high-quality materials, such as alcantara and aluminum, which add a touch of luxury to the car. Sports seats wrap passengers securely, ensuring immersive and comfortable riding.
The dashboard is oriented towards the driver and features two elegant circular vents for ventilation. The steering wheel, two-spoke, has the flattened crown at the bottom, which adds a sporty touch and improves the visibility of the instrument panel. This steering wheel, derived from the 500 Abarth model, features handmade stitching with a contrasting color, giving a refined and luxurious look.

The seat configuration has been entrusted to Sabelt, with two shell seats that wrap the passengers securely and offer excellent lateral support during sports driving. The House logo is embossed on the headrest, adding a touch of style and customization.


4C, DNA driving modes

On the central tunnel of the 4C there is the hand control for the management of the Alfa Romeo TCT dual-clutch gearbox. The latter allows you to select the different driving modes of the Alpha DNA, including Dynamic, Normal and All Weather, offering versatility adaptable to different road conditions. In addition, Race mode was introduced for the first time on the 4C, which also integrates the start control system, known as launch control.

DNA electronic management, which intervenes on electronic accelerator, engine/gear management and traction and stability controls, provides 4 different modes:
1) All weather – all weather, to have soft reactions on wet or slimy bottoms;
2) Normal – daily driving, with gearbox set with 'auto up and down' also in manual operation and basic calibration for the Q2 differential;
3) Dynamic – more responsive accelerator, 25% reduction in change times, more permissive ESC in terms of skid angle;
4) Alfa Race – extreme setting, perfect for the track by limiting the maximum intervention of electronic controls with the ESC deactivated, ASR limited and Q2 differential active.

The instrument cluster, fully digital, is 7 inches in size and is highly customizable based on the positions selected via the DNA handout.

Suspensions, brakes and wheels

The Alfa Romeo 4C uses a double swingarm suspension (double wishbone) with an upper and lower arm connecting the wheel to the car body. This suspension scheme offers greater precision control of the camber angle (the inclination of the wheel with respect to the road surface) and the toe (the orientation of the wheel with respect to the direction of travel), allowing for more responsive driving and better road holding during high-speed cornering and maneuvers.

For the rear, advanced Mc Pherson suspensions that ensure maximum road holding even in the most extreme maneuvers.
The suspension scheme used in the Alfa Romeo 4C was chosen to deliver sporty performance and an immersive driving experience. This configuration, combined with the carbon fiber frame and the overall lightness of the car, helps make the 4C agile, responsive and suitable for a sporty driving experience.

The powerful braking system employs ventilated discs with aluminum bells, to guarantee a total weight saving of 8 kg on unsprung masses and 4-piston pliers at the front.
The brake diameter is 305 mm front and 294 mm rear.

 

[4C🍀]

The car has 18” wheels on the front and 19” wheels on the rear, Pirelli PZero contyres, 205/40 R18 front and 235/35 R19 rear respectively or alternatively 205/45 R17 and 235/40 R18.

Alfa Romeo 4C | ENGINE AND MECHANICS

An unfairly hidden eye show! The engine is the 1,750 cc double shaft 16V turbo with direct injection derived from the Giulietta unit. Only that it employs a lighter aluminum alloy base which, on its own, saves as much as 30 kg compared to its cast iron counterpart.

In addition to the dual phase variator, an innovative Pulse Converter exhaust manifold allows you to drastically reduce the response time of the engine which in the generosity of the delivery curve has its strength. The turbo and exhaust manifold are made of steel with investment casting technology to withstand operating temperatures of up to 1,000°.

On the power test bench, in addition to having delivered 259 hp instead of 240 hp as stated by the House, it stunned us with a substantial and constant torque curve from 2,500 to 5,000 g/m.

This prodigious 4-cylinder, which however seems far from its limits in terms of development, is combined with the 6-speed dual-clutch gearbox of the Giulietta and the Q2 electronic differential.

Real weight breakdown on Alfa 4C wheels


Feather weight

Let's talk about the weight: declared 895 kg, real measured on the scales 999.6 kg with about half a fuel tank. Probably the 100 kg difference is due to the presence of numerous accessories such as air conditioning, 18”/19” rims and other small details. However, on the other hand, on our car there was also the sports exhaust, able to give a crazy sound to the bi-seater of the Biscione!

Real weight Alfa Romeo 4C


TECHNICAL CHARACTERISTICS Alfa Romeo 4C 1,750 TBi

Bodywork Coupé
Number of ports 2
Number of seats 2
Trunk (min-max) 110 – 0 dm³
Tank capacity 40 liters
Mass in running order 895 kg (declared)
Length 398 cm
Width 186 cm
Height 118 cm
Step 238 cm
DOCH 16V in-line 4-cylinder engine, aluminum crankcase, direct injection
Displacement 1,742 cc
Gasoline power supply
Max power/speed 177kW (240 hp) at 6,000 g/m
Max torque 350 Nm
Rear Traction
6-speed Sequential Gearbox
Max speed 258 km/h
Acceleration 0-100 km/h 4.5 seconds
Anti-nquin approval. Euro 6
CO2 emissions (g/km) 157
Consumption (litres/100 km): Urban 9.8, Extra-urban 5, Mixed 6.8

Alfa Romeo 4C | PERFORMANCE DETECTED BY NEWSAUTO

Alfa 4C detections (Alfa Race mode, launch control)
0-100 Km/h 4.2 seconds
0-140 Km/h 7,9 s
0-200 Km/h 17,7 s

Acceleration
0-100 meters 5.3 seconds exit speed 113 km/h
0-400 meters 12.4 seconds output speed 179 km/h
0-1000 m 23.3 seconds output speed 221 km/h

V-Shooting
80-100 Km/h 2,3
80-140 Km/h 7.6

Resumption in VI
80-100 Km/h 3,3
80-140 Km/h 11.4

Braking
100-0 33.7 m
140-0 66.3 m
200-0 137,3 m

 

[Ron Avery]

What a great thread, thanks for sett it up.

 

[Refik]

View attachment 147456

The car has 18” wheels on the front and 19” wheels on the rear, Pirelli PZero contyres, 205/40 R18 front and 235/35 R19 rear respectively or alternatively 205/45 R17 and 235/40 R18.

Alfa Romeo 4C | ENGINE AND MECHANICS

An unfairly hidden eye show! The engine is the 1,750 cc double shaft 16V turbo with direct injection derived from the Giulietta unit. Only that it employs a lighter aluminum alloy base which, on its own, saves as much as 30 kg compared to its cast iron counterpart.

In addition to the dual phase variator, an innovative Pulse Converter exhaust manifold allows you to drastically reduce the response time of the engine which in the generosity of the delivery curve has its strength. The turbo and exhaust manifold are made of steel with investment casting technology to withstand operating temperatures of up to 1,000°.
View attachment 147457
On the power test bench, in addition to having delivered 259 hp instead of 240 hp as stated by the House, it stunned us with a substantial and constant torque curve from 2,500 to 5,000 g/m.
View attachment 147458
This prodigious 4-cylinder, which however seems far from its limits in terms of development, is combined with the 6-speed dual-clutch gearbox of the Giulietta and the Q2 electronic differential.
View attachment 147459
View attachment 147460
Real weight breakdown on Alfa 4C wheels


Feather weight

Let's talk about the weight: declared 895 kg, real measured on the scales 999.6 kg with about half a fuel tank. Probably the 100 kg difference is due to the presence of numerous accessories such as air conditioning, 18”/19” rims and other small details. However, on the other hand, on our car there was also the sports exhaust, able to give a crazy sound to the bi-seater of the Biscione!
View attachment 147461
Real weight Alfa Romeo 4C


TECHNICAL CHARACTERISTICS Alfa Romeo 4C 1,750 TBi

Bodywork Coupé
Number of ports 2
Number of seats 2
Trunk (min-max) 110 – 0 dm³
Tank capacity 40 liters
Mass in running order 895 kg (declared)
Length 398 cm
Width 186 cm
Height 118 cm
Step 238 cm
DOCH 16V in-line 4-cylinder engine, aluminum crankcase, direct injection
Displacement 1,742 cc
Gasoline power supply
Max power/speed 177kW (240 hp) at 6,000 g/m
Max torque 350 Nm
Rear Traction
6-speed Sequential Gearbox
Max speed 258 km/h
Acceleration 0-100 km/h 4.5 seconds
Anti-nquin approval. Euro 6
CO2 emissions (g/km) 157
Consumption (litres/100 km): Urban 9.8, Extra-urban 5, Mixed 6.8

Alfa Romeo 4C | PERFORMANCE DETECTED BY NEWSAUTO

Alfa 4C detections (Alfa Race mode, launch control)
0-100 Km/h 4.2 seconds
0-140 Km/h 7,9 s
0-200 Km/h 17,7 s

Acceleration
0-100 meters 5.3 seconds exit speed 113 km/h
0-400 meters 12.4 seconds output speed 179 km/h
0-1000 m 23.3 seconds output speed 221 km/h

V-Shooting
80-100 Km/h 2,3
80-140 Km/h 7.6

Resumption in VI
80-100 Km/h 3,3
80-140 Km/h 11.4

Braking
100-0 33.7 m
140-0 66.3 m
200-0 137,3 m
View attachment 147462

View attachment 147456

The car has 18” wheels on the front and 19” wheels on the rear, Pirelli PZero contyres, 205/40 R18 front and 235/35 R19 rear respectively or alternatively 205/45 R17 and 235/40 R18.

Alfa Romeo 4C | ENGINE AND MECHANICS

An unfairly hidden eye show! The engine is the 1,750 cc double shaft 16V turbo with direct injection derived from the Giulietta unit. Only that it employs a lighter aluminum alloy base which, on its own, saves as much as 30 kg compared to its cast iron counterpart.

In addition to the dual phase variator, an innovative Pulse Converter exhaust manifold allows you to drastically reduce the response time of the engine which in the generosity of the delivery curve has its strength. The turbo and exhaust manifold are made of steel with investment casting technology to withstand operating temperatures of up to 1,000°.
View attachment 147457
On the power test bench, in addition to having delivered 259 hp instead of 240 hp as stated by the House, it stunned us with a substantial and constant torque curve from 2,500 to 5,000 g/m.
View attachment 147458
This prodigious 4-cylinder, which however seems far from its limits in terms of development, is combined with the 6-speed dual-clutch gearbox of the Giulietta and the Q2 electronic differential.
View attachment 147459
View attachment 147460
Real weight breakdown on Alfa 4C wheels


Feather weight

Let's talk about the weight: declared 895 kg, real measured on the scales 999.6 kg with about half a fuel tank. Probably the 100 kg difference is due to the presence of numerous accessories such as air conditioning, 18”/19” rims and other small details. However, on the other hand, on our car there was also the sports exhaust, able to give a crazy sound to the bi-seater of the Biscione!
View attachment 147461
Real weight Alfa Romeo 4C


TECHNICAL CHARACTERISTICS Alfa Romeo 4C 1,750 TBi

Bodywork Coupé
Number of ports 2
Number of seats 2
Trunk (min-max) 110 – 0 dm³
Tank capacity 40 liters
Mass in running order 895 kg (declared)
Length 398 cm
Width 186 cm
Height 118 cm
Step 238 cm
DOCH 16V in-line 4-cylinder engine, aluminum crankcase, direct injection
Displacement 1,742 cc
Gasoline power supply
Max power/speed 177kW (240 hp) at 6,000 g/m
Max torque 350 Nm
Rear Traction
6-speed Sequential Gearbox
Max speed 258 km/h
Acceleration 0-100 km/h 4.5 seconds
Anti-nquin approval. Euro 6
CO2 emissions (g/km) 157
Consumption (litres/100 km): Urban 9.8, Extra-urban 5, Mixed 6.8

Alfa Romeo 4C | PERFORMANCE DETECTED BY NEWSAUTO

Alfa 4C detections (Alfa Race mode, launch control)
0-100 Km/h 4.2 seconds
0-140 Km/h 7,9 s
0-200 Km/h 17,7 s

Acceleration
0-100 meters 5.3 seconds exit speed 113 km/h
0-400 meters 12.4 seconds output speed 179 km/h
0-1000 m 23.3 seconds output speed 221 km/h

V-Shooting
80-100 Km/h 2,3
80-140 Km/h 7.6

Resumption in VI
80-100 Km/h 3,3
80-140 Km/h 11.4

Braking
100-0 33.7 m
140-0 66.3 m
200-0 137,3 m
View attachment 147462

Thank you for the post - fab. A question: Are differences in real weight breakdown on Alfa 4C wheels (first time I have seen these statistics), significant or not? Would we find greater variances on comparable cars? Thank you.