Thanks for your support on the motor thing, Randman. 9 X 2 maybe in a 4WD on a long track, but nothing lower than a 10 in a truck, and that only at a really long straight like Hot Rod Hobbies (130'). Usually 11 or 12 turns for truck. Keep the single-digit turn motors for on-road.
I do stand by what I said about the gearing. We don't even possess a 12 tooth pinion. I think 15 is our lowest, and I can't remember when we used it with a mod motor. Normal starting point is a pinion 8 teeth over the wind. That is, a 12 wind motor gets a 20 tooth pinion for starters.
His final drive ratio is over 18!!! Normal is 9 - 14. That motor is screaming everywhere on the track -- it never slows down. I'll bet the run times suck too because the motor is demanding full power from the batteries constantly.
This heats up both motor and batteries, further decreasing both performance and run times. Of course it heats up all the electrical connections. Worse yet, it kills the life of the motor and the batteries. The final blow is slow lap times, as the truck can't reach a decent speed on any straightaway
Engineering Without Fear