NES: Al Unser Jr Turbo Racing
You know, this is generally a game I see for around $1 or less actually. You saying it's a pretty good game?
Might have to pick this one up..
Overall, I think racing games on the older systems are not given much attention. This one is pretty neat, and it has some replay value. It controls pretty well, the graphics are good, it has good sound effects, I love the music (only four melodies but they are fantastic). It is more challenging when you create a driver.
This game uses a battery to save your progress, and while you could finish it in one sit, I think it is more enjoyable if you make your own driver and make your car more powerful race after race.
Data East games on the NES are hit or miss (Karate Champ, Robocop 2) and that maybe another reason why this one was overlooked.