Kar racing is a game that I developed some years ago (2003) on demand for an US company "Webfoot games". Nice hours debating game related stuff with game producers...
The develop process was hard and I can remember that I didn't sleep too many hours per day (3 or 4 in the better case).
Well, the game uses directX7 but only for 2d triangle rasterization, the engine was full developed from scratch by me and the CPU managed all 3d transformations. Of course in this time I was a terrible MicroSoft corrupted programmer XD and I loved to use DirectDraw, DirectSound, DirectInput and DirectAnything :S
Now, open source development opened my eyes. (haaaaaallelujahh)
A friend of mine Jorge Gómez was the graphic artist.