Why does weight matter?

So you can push it to keep up with a truggy. You just need a bigger motor. K thx. Got it now.

[zeropointbug]

Yes, the heavier the vehicle is, for a given speed, the more power it takes to move it around. None of the Feigao motors can do 55mph in a Revo 'reliably' (heck, it can hardly do 40mph reliably)... although, a 1515 Neu could do it, my 1512 can even do it, and the temps are still under 180F.