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Inverter "tuning" already exists in the form of controller swaps for OEM EV inverters, allowing higher motor power and operation of inverter in non-standard applications.

Tuning of AC motors doesn't seem to me to have obvious potential... what would you change in a motor? Perhaps higher cooling capacity would allow higher sustained power in some cases, but the fundamental components of the motor are not readily tweaked.

Much of the "tuning" done with engines now simply consists of removing protective features of the control systems, causing them to run with excessive exhaust emissions and reduced reliability - it's sad compared to the good old days of actually improving production vehicles. Controller tuning offers much of the same, allowing overheating of the motor with excessive current and damage to the battery with excessive power draw.
 
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