I drive a LRP brushless system with a 6.5 Motor. If its very dirty and also wet I take the undertray and that heatens the motor up to 80°C, by cutting the body to its marked areas its 15°C less during a normal 7min run. I have also drilled 3 12mm holes into the end of the body that allows the income air to come out. I also tried to attach a cooling unit with fan but its to big and doesnt fit the body perfect, so every time its possible I drive without undertray, but 70°C is normal for my system.
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