jittery, unstable bouncy physics?

How do I make more stable physics?

My vehicle is just kind of bouncing up and down like it has had too much coffee or something, I have tried changing the elasticity, gravity, densities etc.

I want it to just be parked on the ground if it is not moving, not bouncing like a cartoon car.

I can provide capx if needed, is there rule of thumb about this?

Without the capx it could be any number of reasons.

Providing the capx is always the fastest way.

The thing on the back wheel is the ''shocks''

dl.dropboxusercontent.com/u/70111979/jittery%20car%20with%20shocks.capx

One thing you should immediately change is this:

• the tires use collision polygon - set them to circle in physics behaviour

ok thats a little better.

it still seems a bit ''unstable'' however.

what density do people usually make objects in physics games?

If you make everything density 1 and disable collisions with shock1 it's even better.

Maybe play around with the car density a bit..

im finding i like the heavier densities, it makes collisions more realistic.

also im finding i changed the stepping rate, velocity/time, on the tires, and that made the car more stable when on the ground