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Another thought, Tom:
Since the PWM controller isn't 100% efficient, another means of obtaining yet more speed (if you frequenly drive with your foot on the floor) would be a controller bypass. Based on controller efficiency figures I've seen tossed around on the EVDL, I think you'd see at least another 10% speed increase. Plus you could still use field weakening on top of a bypass circuit.
The challenge would be setting it up in such a way that didn't damage the controller from back EMF on switching the controller back into the circuit.
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