Originally Posted by
nashrcracer
i need a 13.5 1 cell lipo rollout for a 150' pavement track with a spx anybody got an idea where to start? bloody 4cell 17.5 gear isn't even close
I have been running an 84mm rollout with a 110' backstraight on SPX Profile 7 on 1-cell. Others at my track have been down below 80mm, but I think this depends on the motor, motor timing, and speed control settings.
For that extra 40-feet your track has, I would start at 90mm and go up or down based on laptimes, not temperature. As long as the temps are below 170F, change gearing based on laptimes. We have been finding that lower rollouts keeps the motor cooler and more consistent from the start to end of the race.