Yes, I know, it's a model car sim, but I do cars too and it does keep your reactions on top form and inproves your driving, take a look and download the demo at
www.virtualrc.comI have the full thing and I think it's superb, you will need either a joystick or a way of connecting your trannie to the computer because it's very difficult to drive with keys.
Also, unless you have a gaming spec computer like myself, I suggest you keep the graphics quality to low or medium.
I challenge you to beat my RC Speedway time of 5.1 seconds, post a screenshot on here if you do
Andy