moving car physics

well, i've setted up my car physics, but i can't move it now. after some searches in the forum, now i know that i have to change physical values to move my car instead of simple ent_move the entity.
i've read an article in the forum that i can change the gravity and mass all the time.
that would be helpful with player physics, but not for my car.

can anybody help me with some simple car physics? just for the car, only one physic object!

i'm really getting stuck on this..

thanks for your help..

ventilators script really looks cool, but i don't need rotating wheels. i only want realistic physic for the car model object

got my answer now, here : Link to Article