Fastest Revo possible

[glassdoctor]

Neu 1521 1.5D and Shulze 40.160 on a big 8s lipo pack. That will produce over 50,000 rpm with power to spare.

These are 3000W (4hp) motors so we are talking 100 amps at 30 volts, which would probably happen briefly.

I have to think 70+mph would be a conservative estimate with a setup like that. you are more limited by running surface/chassis and driver ability than horsepower at this point IMO.