Vehicle Colliders in different gravities

I am trying to calulate the changes that need to be made to the Wheel colliders of a vehicle depending on the amount of gravity. When I change Physics.Gravity to larger values my car begins to move very fast and in low gravity it moves very slowly. Are there any special values for stiffness for example that need to be calculated, does the mass need to be changed? What stats should I change to achieve realistic car physics in different gravities?