I follow Formula 1 racing during the summer. There is a race every two weeks and it's pretty interesting. The races are usually on ESPN or ESPN2 on Sunday mornings (depending on where they are in the world). North American races are usually on ABC.
This weekend is the 24 hours of Le Mans on Motor trend tv. Very advanced cars with some of the tech transferred to street cars. Several years ago they showed a pit stop where they needed to change the break shoes. They did it in 35 seconds. After they did it, the car was out on the track doing over 200 mph. That's trusting your mechanic. I like the different classification of cars in the same race.
Indy Car is on NBC most of the time. It's pretty interesting when they have a road course or street course race. When they do ovals it usually degenerates to a NASCAR race. The cars look kind of stupid though.
NASCAR is NASCAR. Not much into that.