[captain harlock]

Compared to the 6s, the 1920/7 will be quite competitive, but you need to readjust the gearing of the truck and probably another cell will not hurt at all, but you'll be truly amazed by the power of the 19 series motors. My 1920/8 motor can make the T4 of mine pull out of my grasp or tear up the carpet its spinning on at 13.2 volts. The carpet in my room smoked out because of the rediculous power the 1920 has.