OK... I gave up, as I see you aren't interested in helping out... Just posting silly jokes around... That behavior isn't realistic, I know that all physical engines aren't perfect, but such behavior isn't acceptable! And this isn't physX problem or bug, you won't see anything similar in UNITY or UDK... This is problem with implementation of it in GS! I've made clear video which shows how wheels are jerking up, that will never happens with ODE, and you'll never see such behavior in other game engines which are using physX, I wonder why?! But OK leave it as it is if it's good enough for you guys. But I still don't see any reason to make high poly race track to make movement smooth and to update vehicles tilt and roll smoothly and realistic, not as if I used trace to get normals and then just simply change tilt and roll of model, at least thats how it looks at the moment... I wonder who even tried to run demo I've posted above... I'm pretty sure none of you did.

EDIT: Superku thank you for trying to help. At least someone tried to help.