by mungewell » Fri Jul 12, 2013 2:20 am
Firstly are you sure the wrong wheels are driven... where did you find these car models?
The pyhsics of the car is defined in its '.xml' file, there is a section for specifying the drive train. For example:
Check what your model has defined, the author may have only been concerned with the graphic side of the car.
Simon
PS. Also note that parameters are checked against what is allowable for that category, so you might find some values are being changed if the car is in the wrong category.