[jhautz]

Its that speedo I'm betting. Try setting it to race mode and NiMH battery type. That should help with the over current kick out. If it works in race mode (or at least works better) then you can be sure its the same problem the others were having. If what they found in the other thead is right then a shipment back to MGM will be in order to fix it.

On 4s with that setup you could just run the Mamba Max with a 25mm fan on the heatsink and you should be fine. The MM can handle the same amount of (or more) current as the 90amp MGM. The MGM you have would be great for a very high voltage setup (8s or 10s lipo) But you dont need that in a buggy. the 4s you have is plenty.