buggy suspension dynamics

Quick test using maya's dynamics system and a poly helix which has a blendshap on it. There's a dynamic spring constraint which drives the position of the bottom of the spring.

Problem with this test is the bottom goes right through the top position due to the momentum on the first swing. In reality the upward motion would cause it to bend and move out in the x or z axis as it finds somewhere to go - the springs length cannot physically pass beyond a certain point.

This is not really an issue with a cars suspention because it is physically constrained by its pistons so cannot travel beyond its shortest point.