I ran mine with and without the shell but i have two fans on mine and am only running a 1515 1Y not the 1527 so temps weren't really an issue. I could get it to cut out on the temp fuse by getting the truck to just wheelie up and down my street non stop. (on and off the throttle wheelie brake wheelie brake)As soon as the TX returns to neutral the ESC fuse is reset. But mind you my truck was geared for 80mph corrected on 6s at that point because of the diffs.
I remember that you put the truggy diffs in yours as well that should help a lot. The other thing you can try is running it on 6s that should drop your amp draw and hopefully your temps as well. Mike is selling 10 tooth pinions from losi they are pretty good. I also have a more practical motor for sale that is brand new in the box
Are your batteries good quality. I bought maxamps batteries to begin with and they are pooooooo
., flight power all the way.
I have recently switched to running a MMM at the moment until i get the brakes sorted on the MGM and until my black box gets back from repair so that i can run it again. All the sensor wires are soldered onto the controller and i would hate if they got caught and torn off while i was running. The MMM doesn't get that hot the fan will come on every now and than but i dont know if that is because of the batteries i am running or the fact that putting the truggy diffs in have made the drive shafts a little too long causing some binding i will experiment a little tomorrow with gearing.
As far as shell mounting i made an alluminum plate that went directly over the motor to mount the ESC. I got the guy at my LHS to make some standoffs that i could screw into the G3R chassis. That way the ESC sits around window height on the shell and gets good airflow when you put a few holes in and you can run a greater variety of shells
