what application are you using the motors in, i.e. 4 cell 12th scale, 6/5 cell 10th etc. What motors are you using 27t 19t or mod? and what type of track are you running on, high or low grip, asphalt or carpet, big track or small track, open or tight.
You have to watch the TechnoViking http://www.youtube.com/watch?v=_1nzEFMjkI4