Well I did a couple of runs on the VXL with 3s and it was pretty good...... but not perfect, power was ok but not great. Everything was running quite hot as the vxl on 3s is already at the limit without using a heavy crt .5 (not
that heavy but heavier than the rustler it came out of).
So......... so I bought a MMM and a 1512 2650kv

weight is about 100g more but a much better combo, im going to try it with a 3S this afternoon for a direct comparrison then probably get hold of a 4S pack. Im going to make a new chassis as I think the motor needs moving back and out a bit to make room for rest of the electronics.
Oh yes and after fighting with diff gears, outdrives and prop shafts i've given up, im going to fit a PROPER regular sized 1/8th center diff with a plastic 46t kyosho spur and use beffy 1/8th prop shafts.