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Originally Posted by Barry Williams
My son runs a GTB 5.5 in his B4 on 81/20 gearing & it goes really well, but be aware that it`s not just the motor that gets hot, the speed controller is where we`ve had probs in the past with it overheating & the thermal cutout stops or slows the car dramatically. I have recently had to cut the body shell to allow more airflow to try to cool things down.
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Indeed, most of the 'work' in brushless setups is done by the speedo, that is normally the thing that will over heat.