Hey, thanks for the feedback! Regarding 1st gear, while I do agree it feels a bit too long, especially on race start, I am following the official specs of the real gearbox (reverse gear is even slightly longer...). You have to play with the clutch to get a good launch, but it tends to heat it up quite a bit.
Center of mass I recently moved up again a little bit as I had made it likely too low, although to be honest I do not know how high it should be - what I can say is I have not managed to roll the car on a flat straight, even with abrupt steering and playing with the brakes. However, it does indeed roll somewhat easily when going on kerbs. My main references for that behavior would be from videos of Jardier's Clio Cup season, there are 2 instances of a car flipping after being hit and turned almost 90 degrees by another car, even on a flat surface (Paul Ricard, but there's another instance at Eau Rouge, Spa), and Jardier himself had to ease the steering to avoid rolling after riding a kerb at Paul Ricard.
Also, another reason for higher CoM is to help the car go 3-wheel, but even as it is now it won't lift the rear as much as the real car.
I unfortunately have no proper reference for the turbo (what pressure I should put in LFS or how much it lags), I kept default settings here, I'll have another look at official documents to see if I can find something useful.
As for the sound, I must admit it's not really to my liking (not close enough to the real sound), I agree it could be a bit louder, I just hope it won't cause clipping if I do that.
