Besides the obvious similarities (same director, same lead actor, same type of formula), those are both classics that lovingly embrace their cheesiness and take it to the entertaining extreme. I love both of these films, and while feeling Top Gun may be the "better" film, I love Days Of Thunder more. That's about far as my interest in motorsport goes.
Top Gun +
Days Of Thunder +
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"George, this is a little too much for me. Escaped convicts, fugitive sex... I've got a cockfight to focus on."
"George, this is a little too much for me. Escaped convicts, fugitive sex... I've got a cockfight to focus on."