Hey JX53mb,
I’m giving your physics a test using my own models and I’ve followed your instructions as best I can. My cars are completely uncontrollable though. I think my problem seems to be that the collision for the wheels has a radius of a minuscule amount. I don’t know why this is. The cars (not scaled in any way) are of similar size to your example car, but the radii of the wheel’s collision is like .3, which is wrong, it should be ~30. I even tried with a blank project and I’m still getting this issue. If it helps I’m using Blender, whereas you use 3DS Max. But I wouldn’t think that would matter because they’re importing in a similar size.
Can you help me at all