Just for a reference, I just upgraded to brushless on my Madrat.
I have installed a sp 7.5t motor and esc gt2.0 lrp speed passion and currently using a 24t pinion.
I gave it a test run on grass for 15min and the esc was just warm to the touch. the motor was not even hot.
I think it also depends what settings you have programmed into the fine tuning of your esc.
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