Recommended Project Settings

Min/Max Contact Settings

It is not required, but highly recommended to set your Physics Contact Offset settings as low as Unreal will allow you. 

The default settings will cause your wheels to bounce when moving between separate surfaces as if it hit a bump, even when they are at the exact same height. This effect gets worse the higher your movement speed.

Max Terminal and Angular Velocities

These settings will limit the max speed of your vehicles. I recommend these values:

Physics Substepping

Highly recommended, turn on physics substepping. This setting adds extra physics frames if your frame rate drops too low, keeping the physics simulation stable.

That should be it! The Vehicle System should internally take care of any other settings where possible.