Weirdest one I ever drove was my brother's 91 non turbo rx7. He said that I should treat the redline as a minimum... Well, ok, if you insist... he showed me how he wanted it driven: Wrapped the tach back around to 2k before shifting - sounded like a giant electric RC car. And it just kept pulling the whole way. Knowing what I know now about rotaries, it's amazing it held together at those insane rpms... Best guess is about 12krpm. I seriously doubt he had premixed oil into the gas, so those poor apex seals were probably screaming bloody murder.