I am running 4s with my MM in a Rustler, I have the LVC set @ custom and 3.3 vpc I have found this is about the time that the vehicle starts to slow down anyways and I dont run a fan or cap and ESC runs cool the feigao runs pretty warm to hot mostly beacuse I have it geared up and it s Feigao....lol...also set up the BEC program before you solder your connections, I soldered my connections than tried to program and it confused the Castlelink, I called CC and they told me to program first. So I had to desolder and remove shrink tubing and do double work...I really hate that.....:-(