Wing from Reverie ?You probably mean downforce numbers? The GMS race wing (1700mm span / 300mm chord) numbers are provided by the wing manufacturer data and the GMS rear hood numbers are CFD estimates of similar designs (991 GT2 RS).
The downforce numbers are:
The exact figures for our wing are measured in free air stream, not on the car, so the raw numbers below are slightly higher than numbers we are stating.
- GMS rear hood with ducktail 20kg - 30kg of downforce at 160 km/h (CFD estimate)
- GMS race rear wing 30kg - 40kg of downforce at 160 km/h at 0° AOT (angle of attack)
- GMS race rear wing 70kg - 90kg of downforce at 160 km/h at 12° AOT
- GMS race rear wing at 12° of AOT mounted on GMS carbon rear hood with integrated ducktail = 100kg+ of downforce at 160 km/h
Angle (°) / Df (N) / Drag (N) / -L/D (ratio) / Drag (BHP):
*There is a slight mistake in video description ("30kg - 40kg") of downforce for hood only, up above are correct numbers...
- 0° / 461N / 32N / 14.62 / -1.9 bhp
- 4° / 672N / 48N / 13.89 / -2.9 bhp
- 8° / 857N / 71N / 12.01 / -4.2 bhp
- 12° / 954N / 95N / 10.02 / -5.7 bhp
- 14° / 966N / 108N / 8.93 / -6.4 bhp
- 16° / 964N / 126N / 7.67 / -7.5 bhp
Calin, I'd rather not disclose all the details as we've put a lot of effort in selecting the wing and persuading the manufacture to make us a small batch of custom shaped wing to fit within the 4C's body limits without loosing too much of effectiveness. The wing is curved according to the 4C's rear bumper (looking from the top), it has 300mm of chord width in the center section and a bit less on the side sections, 1700mm of span width and it is heavily cambered towards the edge, to make it act as a gurney flap. Due to this (curved, narrower side sections), we are a bit down on downforce and a bit up on a drag but with heavily cambered profile we stall at a bit higher speeds, compared to the wings already available on the market.Wing from Reverie ?
As soon as we are sure our current material selection is the thing. By spending lots of testing hours on design and materials especially, I am confident to say that improper selection of material for ARB will affect the effectiveness of the ARB on a long term to the point you might end up with nothing but well over 10kg of ballasts on your car. Thick, mild steel tube will drop its yielding characteristics after a long time use and because the 4C has short travel suspension and movement of the ARB's on the 4C is very limited this is a very important aspect when it comes to proper material selection.And now the answer to the biggest question ever asked on the forum (“When will the ARB be launched?”)… 😂
As mentioned the new, revised GMS 3" Dual center out is compatible with OEM, aftermarket and GMS ARB's. And by the way, it's slightly less loud. We plan to have the first batch finished this weekend and then they are off to customers. When we get the next batch done, I'll make it available again in online store.And the biggest question ever asked on the internet - when will the GMS exhaust be able to accommodate them?