can i make a suggestion. make a track with dojo sise 1, and the all the track is a floor. you can have high friction areas and low frition areas and even ramps. you both race and theirs an initial push ot get you started. and then you try ot push the other guy off the track to get DQd.
or you could have then race in a figure 8 track and see what happens
and you could but relativly high grav and DM, and still be fun
the problem with this isi that the driver could just stop and stay on the track, whcih is probably safer.
hope you get done soon, id love to try out htis mod