Didn’t care about racing games, yet ?
Download track-mania-nations. A free(!) adaption from a commercial game, which is absolute addictive to play. It sometimes reminds me playing a logic puzzle with a racing car (especially the expert tracks). You can create your own tracks and play on LAN and the internet against human opponents. I didn’t care about PC-Games, particularly racing games, but this one is different. Just fast, good to control and looks nice.
Video of aM.01:
Copy the tracks into:
\TrackMania Nations ESWC\GameData\Tracks\Challenges\Downloaded\