woo. heated discussion. Anyway, I think that the major thing to fix would be unreasonably far bounces. bouncing on collision isn't to bad of a thing, but when the car decides to spontaneously shoot of into the sky, that's rediculous, and not very fun. If everything was realistic, it wouldn't be very much fun. You wouldn't make insane stunts or jumps. I think one minor adjustment would be to implement more realistic air friction. I forgot the equation, but I think it's either drag=coef*vel or drag=coef*drag^2 . Maybe try both? simply apply this to the verlets. this way, even if it does try and go shooting off, it will radically slow down.