There are a wide variety of RS 540 motors.
The Tamiya Black Can 540 and the so called Torque Tuned variations are only marginally better than the stock 540 silver can.
The RS540J is surprisingly good on the field.
The Hackmotos 540 23T is VERY hot. It is not going to work with any pinion larger than 26T.
The Sports tuned does not really give any visible performance gain.
The “black” motor is pretty popular these days. It is 23T (there are 21T variations) with approximately 20000 rpm. Speed is good but torque is not.
The vintage Tamiya RX540SD was pretty decent.
Wild One on a 21T:
CC01 on a 23T:
TD4 on a silver can:
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