Mamba 6900 on ZX-5

Im usin a 6900 in my ghetto rustler. The ESC will heat up when its offroad but the motor itself stays pretty cool. I've mainly been doin on road speed runs geared high with a 3s lipo. Still playin with weight distribution and aerodynamics, have only achieved 66 mph with near stock gearing. But then again its only 2wd, but weighs in pretty hefty, 5-6 pound range.