Help with car suspentions

Hello everyone, I am wondering why the vehicle jumps like that. I put a fairly substantial mass in the tires and the mass part but it still jumps do you have any solutions? Could it be because of the springs that turn (I don’t know why they turn)?

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If you lower the damping on the springs it should stop. This is a common issue from over-damping spring constraints

Hello, after removing the constrained springs I noticed that there are also bounces…

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For the spring that turns it is due to the fact that I reversed attachment 0 and attachment 1 sorry…

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Your springs look like they use the Attachment connected to the wheel Attachment, not the one connected to the suspension which is probably why they turn.

Are you using the MeshParts as the CanCollide wheels? They probably aren’t smooth and round. Try making them CanCollide false and using Transparent Cylinder Parts as the physical wheels instead that are centered on the wheel’s hinge.

It’s good to have fairly dense wheels, but you also need to have some mass to the chassis as well. If there is low chassis mass then the springs won’t react like the springs on a real car.

What ratio should be taken between the mass of the chassis and the tires?I use perfectly round wheels. I’ll still try with something else…

You have to tune the mass of the chassis.
I usually start with all the wheels Density of 1.5, then keep testing with different Density of the chassis to tune the vehicle.
Also tune the Friction of the wheels so they have more or less grip with the mass of the entire vehicle. It’s a bit of a pain because changing one of those 3 will affect the way the car handles, but you may have to change the other 2 as well to get the performance you want.

MeshParts usually aren’t perfecly round and will have flat spots.
Roblox has designed Cylinders and Balls to act physically round as wheels, but you can still visually see flat spots on them.

Try tuning the chassis and wheel Density. If that doesn’t help then weld cylinders to the wheels and see what happens to the way the vehicle drives.