fastest motor

[Serum]

Again; WHAT did you use to measure both speed and power? got an eagletree or anything else?

700 watt for 50 mph with brushed?
that's like 525 watts on the output shaft of the motor (75 percent eff.) which would make it possible to run 50 mph with 2S of good lipo cells. (not talking about runtime, just about the speed) i don't see that happen,

You should say how fast you want to go, a 7XL would take you to 60-65mph in 1/8 buggy. However a LTM 1940 8t would take you to im guessing 70+mph.

this is what gave me the idea that you don't have got much experience with power and brushless. No offence, but trust me, 70mph takes an awfull lot of power (Watts)

My lightweight e-maxx takes 1500 watts to get to topspeed and to stay on it takes a rough 1200 watts (and since it weighted about 6.5-7lbs with that setup, i don't think it's a heavy maxx, and a much lighter maxx isn't very possible)