try using ph_sphere instead of ph_poly on the wheels, you limited the hinges to not let it roll it's own axis over, so dont worry about that.

Code:

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phent_setmass (rearLeftWheel,130,ph_sphere);
and in the toher function
phent_setmass (rearRightWheel,100,ph_sphere);
 

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try it like this.

in my experience with physics (ragdolls, race cars, nascars, anything you can think of, even minigolf) i've found out ph_poly makes on impact objects "explode", i allways try to avoid it, only thing i use it on is my chassis.

regards,