Algodoo

well the wheels arent centred properly you need to make the wheels have a center hinge and just use a solid clear circle

try to make a better suspension and if you down the hinge force it will help a little

I have downloaded ur scene and tried fixed it.

The problem is that pylogons r not good as wheels.
Because They begin to bounces around at high speed

Instead, I putet an circle into the wheel, it works much better.

Ok.

The suspension set is not working very well.
It's hard and break easily.

Whatever....

The car looks brilliant.
and the problem is so small.

So i have made a fixed version, and if u want i can upload it.

Thanks for all your help, I've been looking at this and I think I'm going to start all over again with a different car.
The suspension was glitching like crazy, and I found the reason it was bouncing around so much, was because of the tire, when I hollowed it out for the alloys, it seems to have messed with the collisions for circles or something, I added another, slightly larger wheel behind it, and made it transparent and it worked fine, but, it made the layers more complicated than I want.

But again, thanks for the help =D