[suicideneil]

Link fixed.

With lipos, each cell is 3.7v nominal, so 18.5v / 3.7 = 5s. Fully charged voltage is 4.2v per cell.

Sensored escs are good for crawling at very low rpms (where as a sensorless design will have issues reading the back emf signals from the motor as it needs a certain number of rpms), or for multi-pole outrunner motors used in a direct-to-diff drive system for example; in the vast majority of cases, you dont need a sensored setup, plus the only good ones are Novak (under powered if you want to go faster than ~35-40mph), or the Tekin RX8 (expensive as its aimed at racers, and only 2 motors available).

I would look in the 1/8 scale onroad think tank thread and read the whole thing- basically the same kinda cars as what you're building, only they are 1/8 to start with, rather than being stretched.

Dunno what you mean about needing a front diff though? Your emaxx has a front and rear diff, and would work best with a centerdiff unit bolted to the middle of the chassis in place of the tranny, just like a typical 1/8 conversion done using one of Mike's centerdiff motor mounts.