well because even though it is a high quality motor its out of its efficiency "nook" and you will loose power through heat and cause your electronics to get warmer. with torque you can gear way high and achieve the same goal. you want 50mph? then i think a 2300 kv motor with 6s high burst amp rated lipos geared at about 24t pinion should get you there. but im guessing right now not really positive. there is a member on traxxas that his revo went 60mph on 6s with a lower kv nue all he did was gear to the sky. i think it was stumblin.