My car is rigged with constraints, Cylindrical, and Springs. The friction and the friction weight are set to max, 2, and 100. There’s a mass part in the middle of the car below it. The speed of the car is 70, here’s a video;
https://streamable.com/dkj6mr
Thanks for any help! 
Did you modify the baseplate’s CustomPhysicalProperties? Does that maybe help?
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I’ve mentioned that the wheels have the friction weight and friction set to max.
im not sure why try checking the script of the chassis something might be there