I run the HW150amp sensored on 4s with a tekin truggy motor. It's fast a very smooth. I tried sensorless and I got destroyed when I wrecked and the marshal flipped me over. Guess what the castle did? sang and just as it decided to move, BLAM. Broke the right front wheel completely off. I run sensored on everything I race, it's insurance to being FOODER in the track. The brakes are way better also. You might think about 6s for a monster truck, keep it cooler, way fast.