The truck was completely stock and running the 2000mAh Tenergy. But, even with the 650mAh NiCD, it was still pretty quick.....if only for about five minutes.
I'm not sure what motor is in that Buzzsaw, Jean, but my guess is it's the 360. If it's slow, then it's probably geared to go slow. Weight and tire size might also factor in. Pull the motor and see exactly what you have.
My Tacoma, in stock form w/ battery, probably weighed close to 2 - 2.5lbs. It was really light. Remember, it also had a Lexan body, which kept the weight down.
My guess is that max efficiency RPM for the 380SH is at 6V (nominal rating). Perhaps others with greater knowledge on the subject can chime in here.
If I were you, I'd pull the motor and see what you have. If it's a 360, then experiment a little..... swap the pinion gear onto a 380SH or 380 Sport Tuned and let er rip.
Tamiya Toyota Hi-Lux Monster Racer