I do dream about cars sometimes. One time I dreamed about watching someone attempt to break the land speed record but then they just went about 2000 km/h into a concrete wall...
I had a scary premonition late last year though, (both in dreams, and general thoughts) It was about a week or month before the final Indycar race of the 2011 indycar season and with the old cars and in the week before that race I kept thinking that something terrible was going to happen. That someone was going to be killed. I think i even had a dream the night or two before the race that it would have been Dan Wheldon who died. I think I mainly thought that because he had done almost all of the testing with the new car and I thought that something bad would happen to him.
The next morning, I turned on the TV (It was morning for me in Australia during the indycar race) there was a wide angle showing debris (not long after the crash, and before the announcement) all over the track, It looked like an explosion went off. When I found out that Dan had died, I was just shocked, especially because I had been thinking that something like this would happen in the last race with the older car.
Some dreams I have about racing are good though, like me winning an F1 race or something along those lines.