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There was a misunderstanding with my garage booking… I was a month out. They get fitted on the 26th 😁

But I will say I love how flat the car corners now with the coilovers. I love how it feels now. The harsh ride has gone and the car feels like it’s on rails even at speed.
 

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Could you sum please it all up 4 me Rudi @GMS, as I am a bit confused by your own love letter to the OEM setup in your product descriptions.
For primarily street use, with 2-5 trackdays a year.
  • Does this tune lower the car either way, or can it be put to standard (of factory) height, as Belgium roads are full of stupid concrete pieces trying to lower the driven speed, but hence making driving a lowered car a painfull experience.
  • When the height can be kept standard, would the ride quality also be improved, or do you get the same result by putting uniballs in the standard arms?
  • And in that respect, is a standard front (with or without uniballs), GMS rear arms setup a balanced setup as well?
  • Is this mod worth doing before you get coilovers, or should we begin with those?

Thx, and enjoy summer!!
 

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Discussion Starter · #84 ·
Sure...

  • Does this tune lower the car either way, or can it be put to standard (of factory) height, as Belgium roads are full of stupid concrete pieces trying to lower the driven speed, but hence making driving a lowered car a painful experience.
This upgrade itself, does not alter the ride height. The coilovers do and they should be adjusted accordingly. As mentioned in previous posts, with OEM front control arms, the optimal ride height is no lower than the default factory specified ride height which is 110mm (ground clearance from skirt to the ground with 1/2 of fuel and a driver in it). If your car is any lower than this, your geometry at the front is sub-optimal. With GMS performance front control arms, the recommended ground clearance is 100mm at front and 110mm at rear (ground clearance from skirt to the ground with 1/2 of fuel and a driver in it). You can go another 10mm lower on both ends, with a track only car, but for a street driven car, anything lower than 100mm at the front is not a pleasant drive over the potholes and speed bumps. Yes, you can run the GMS performance front control arms at "standard" height without an issue, but then again, the uniballs alone would be enough to make an improvement over OEM setup, no need to go for entire new GMS performance control arms, as they work the best with slightly lowered cars.

  • When the height can be kept standard, would the ride quality also be improved, or do you get the same result by putting uniballs in the standard arms?
By keeping OEM control arms, not lowering the car and replacing the OEM rubber bushings with GMS front control arm uniballs, the steering feedback, dynamic alignment change and steering precision will improve and the geometry will stay as with OEM control arms is. An improvement over OEM setup, but not as noticeable as with the rear control arms upgrade.

  • And in that respect, is a standard front (with or without uniballs), GMS rear arms setup a balanced setup as well?
Running the GMS performance control arms or uniballs at the rear only, is perfectly fine. While I can confidently say that GMS performance rear control arms or uniballs will reward every 4C owner with much finer handling and overall feeling of the car, the GMS performance front control arms are aimed for track focused owners, to extract the very best out of their tuned, lowered cars. For other, not so hardcore users, the GMS front uniballs are more rational choice.
  • Is this mod worth doing before you get coilovers, or should we begin with those?
Do the coilovers first.
 

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@GMS - Have you completed the final design for the full arms yet? Have you shipped any units to anyone?
 

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Discussion Starter · #86 ·
There were several noticeable improvements (thermal stress, rigidity and fatigue durability) and revisions made since the first prototype, so the engineering challenges on this project made the fabrication process a bit longer than expected, all to make the product up to our standard. Finally, all the parts are now fabricated and the positive reports on fatigue stress analyze we just had received, were the last missing part of this engineering puzzle. We are now ready to hand over the final product to the cutomers. The preorders are to be dispatched next week. Will post some pictures later...
 

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Sure...

  • Does this tune lower the car either way, or can it be put to standard (of factory) height, as Belgium roads are full of stupid concrete pieces trying to lower the driven speed, but hence making driving a lowered car a painful experience.
This upgrade itself, does not alter the ride height. The coilovers do and they should be adjusted accordingly. As mentioned in previous posts, with OEM front control arms, the optimal ride height is no lower than the default factory specified ride height which is 110mm (ground clearance from skirt to the ground with 1/2 of fuel and a driver in it). If your car is any lower than this, your geometry at the front is sub-optimal. With GMS performance front control arms, the recommended ground clearance is 100mm at front and 110mm at rear (ground clearance from skirt to the ground with 1/2 of fuel and a driver in it). You can go another 10mm lower on both ends, with a track only car, but for a street driven car, anything lower than 100mm at the front is not a pleasant drive over the potholes and speed bumps. Yes, you can run the GMS performance front control arms at "standard" height without an issue, but then again, the uniballs alone would be enough to make an improvement over OEM setup, no need to go for entire new GMS performance control arms, as they work the best with slightly lowered cars.

  • When the height can be kept standard, would the ride quality also be improved, or do you get the same result by putting uniballs in the standard arms?
By keeping OEM control arms, not lowering the car and replacing the OEM rubber bushings with GMS front control arm uniballs, the steering feedback, dynamic alignment change and steering precision will improve and the geometry will stay as with OEM control arms is. An improvement over OEM setup, but not as noticeable as with the rear control arms upgrade.

  • And in that respect, is a standard front (with or without uniballs), GMS rear arms setup a balanced setup as well?
Running the GMS performance control arms or uniballs at the rear only, is perfectly fine. While I can confidently say that GMS performance rear control arms or uniballs will reward every 4C owner with much finer handling and overall feeling of the car, the GMS performance front control arms are aimed for track focused owners, to extract the very best out of their tuned, lowered cars. For other, not so hardcore users, the GMS front uniballs are more rational choice.
  • Is this mod worth doing before you get coilovers, or should we begin with those?
Do the coilovers first.
Thanks for the explanation, Rudi. Will be looking into the path to these!
 

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Discussion Starter · #89 ·
We expect to have a smaller batch finished and ready for dispatch in 14 - 21 days. First we'll cover the backorders. Then, those of you who have registered "back on stock requests" via our online store will be notified via email when the parts will be available again. Once we sort out both of this areas, we'll make the control arms available in online store again. We are trying our best not to let anyone down and deliver parts as fast as we can, but the complexity of this product takes about double the time to fabricate compared to the GMS performance rear arms so we thank you for your patience.
 
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