Here are pictures of that xxx4-G+ with the Quark33 and the neu. I found in an old email that it was an Neu 1105. Thats a really small motor. He ran a 2100mah Lipo pack. Basically a 1/18th setup, but the xxx4-G+ is so light because its all graphite that it weighs the same as a Losi Mini LST which runs fine on a heavy duty 1/18th setup. He claimes his buggy was running 1lb lighter than his buddies xxx4 with a Novak GTB 4.5 and 6cell and had better acceleration. Also claimed a 30 minute run time, which I have a hard time believing on only 2100mah pack.
Don't forget I think this worked for him cuz the 1/10 he was running was so light. If you try this in a rustler or something you will likely not have the same sucess. Also notice the BIG fan over the esc in the pictures. :eek:
Why not try the Quark 33A instead of the mamba25. The Quark is at least rated for 5s Lipo and has a heatsink which I think will at least give it a chance.
http://www.quarkbrushless.com/pro_procarcontrol_33a.htm