Need info for 80mph brushless truggy...

[_paralyzed_]

I'd go atleast a 1521 because that speed you want is geared pretty high.

Did you gps or radar your revo? 66mph all day long would take a serious nitro motor, and usually at those speeds second gear melts. That's with an o.s. .28, so you must have had some serious motor.

Usually brushless rigs are geared for one thing. Bashing, racing, or speed runs. I suggest carrying two pinions and gearing up for speed runs and gearing down for bashing. Not doing that is why your buddy is overheating.