[gtxracer]

Tom - I don't know what's going on with your setup, but even 80* weather with high humidity, I ran my MM/9XL/BEC setup without fans and it was fine on 4s. I was getting up to 35 min runtimes just messing around in grass and up to 20 min on the track. It's probably your gearing. Make sure your rear set screw on the diff input is tight, that will cause all your power to flow through your front wheels if it's loose. Also, gear up and use the speed calculator to pinpoint what your proper gearing should be for your desired speed. I have a CR (buggy) mount in mine, which is why I have a higher pinion.