hey my uncle just bought the hpi 4wd wheely king rtr and was wondering what is the biggest pack he could put in it also what are the motors/speed controllers he could add to it
The biggest battery that will fit in the stock holder is a flat 6 cell stick pack. The motor plate is set up to use a 540 motor which means his choices for a motor and esc are almost endless.
As far as the esc and motor are concerned there is no limit on mah, voltage is where they have limits. I wouldn't go over 7 cells on the stock esc, it has trouble with just 6 cells depending on the gearing.