In suspensions.ini:
[BASIC]
WHEELBASE=2.705 ; Wheelbase distance in meters
If you want to change the position of the car model on the suspension; car.ini:
[BASIC]
GRAPHICS_OFFSET=0,-0.450,0.295 ; 3 axis correction (x,y,z), applies only to the 3D object of the car. in meters
There you can move the car model