isn't this
https://www.youtube.com/watch?v=gwh4WJnC0-8 and older build?
I think I know what My mistake was.
when the tire were doing discrete collision, the collision assume a 1.0/32.0 of penetration.
this allowed for the collision to move smooth form frame to frame.
Now I change the to be continue Collison by doing a convex sweep, what this does is that the tire now have a zero penetration.
by doing this is possible that the tire may be very close to eh ground and the collision return a failure
and report zero, then the tire is under the influence of the spring only and sync the spring is very strung is get pushed down.
The in turn cause a deep penetration which the solve need to resolver by pushing the tire up with a constant velocity for a few frames until is clear the ground, and the it the effect repeat again.
actually as bad as this video looks,
https://youtu.be/qPgkvAdh5Z0is very realistic, unwanted but realistic.
This is what happen when a car has a super inflated tire, or when the shock absolver are damaged.
basically the ground at as a high stiff spring and tire keep bounce off the ground.
The solution Is that I need to allow for the tire deflation. Basically this is the value that the tire is allow to deform when I hit the ground and allow for contact continuity form frame to frame.
I will fix it tonight.