Saturdays of Thunder

"Saturdays of Thunder" is the ninth episode of The Simpsons third season. It first started on the Fox Network in the United States on November 14, 1991. 
Story.
In this episode, Homer takes a fatherhood quiz and realizes that he knows nothing about Bart. He tries to be a better father and learns that Bart is entering in a "Soap Box Derby." Homer and Bart make a racer together, however it is not very good, and Bart decides to drive Martin's much nicer racer instead. Homer is at first sad, but decides that he must be a good father and support Bart.