I've found with my CC 5700 and esc that it does better with a little lower voltage. I'm running it in an E-Maxx with giant Losi Claw tires and it is really fast but it gets really hot. The timing is on low. With 7.2V it will run cool all day pushing the heavy Emaxx through grass or whatever. When I jumpo 14.4V it starts getting hot and shutting down. I have tried several different gearing combos but the mamba doesn't like 14.4 and the heavy Emaxx combined.

When I was running it in my B4 with a 3S it never even got warm. I was getting 60+ mph out of the B4 (if I could keep it from flipping over).

I lowered my gearing even more today on the Emaxx and it ran great on 14.4V nicad. Unreal power from a motor designed for a small buggy or truck.

Running such large tires through the built-in BEC with 12 cells will put quite a strain on the built-in BEC. This causes the BEC to get HOT, and once it gets hot enough, it will cause the Mamba Max to shut down. You can help this problem by running either a receiver pack or a UBEC.