Daf the reson im asking is i figure my gmaxx and the bl revo should weigh about the same. My gmaxx with the 3100xl on 12 cells is noticebly faster than my racebomb with the 9L on 14 cells.
The 9L on 14 cells could be geared to beat the 3100 on 12 cells for the simple reason that there is more power available(2 extra cells). The xl3100 is a faster motor, though. The xl2800 on 14 cells would be a sweet setup in a revo.