Started to write this out, and suddenly remembered most are geared for 'on the road.' None of these will be exactly what you seek. But worth a look.
Recently on OneBookShelf (RPGNow,WargameVault,etc.) there's Outrider, pretty close. Most games, including GW's Dark Future, also a possibility, were designed around Matchbox/Hot Wheels sized cars.
I've even seen Thunder Road board game converted to larger tabletop.
Doug