Ive been having a lot of fun playing with a game called Racer. Its a freeware hardcore racing sim. Not arcade style, this requires a lot of practice. Also, its in Beta mode. That means lots of bugs. Particularly with crash physics. You usually end up flipping all over and they flying way way up in the air.
Its really cool though, with lots of realistic touches, sound, driving dynamics, etc. The game only comes with one crappy car and map. Since its a hardcore sim, all cars and tracks are made my users, and you are encourged to make your own. However, you can download user made cars & tracks, which is what I have done. Since it is in beta, many cars & tracks what worked fine with the previous beta dont work with the latest beta. It requires a lot of patience and tweaking. If you dont have patience, wait until the finished product.