Algodoo

Put your car here and film top speed at low sim speed, then take note of how long it took your car to go 1 meter. When you've done that, find out the fraction of the normal sim speed the simulation was running at. Multiply 1 time your sim speed (my sim speed was 0.010, or one hundredth of the normal sim speed) and you have your speed in m/s once you have divided your result (mine was 100) by the number of seconds (realtime) it took your car to travel 1 meter (took the Audi 2 seconds). Then convert to MPH. BTW, this Audi, made by JoshTGM, has a top speed of about 111 mph.