Quote:
Originally Posted by Piotrsko
I believe the process is like the torque vs hp curve on an ICE. Max efficiency is supposed to be wheere the lines cross.
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Where did you hear that? The lines cross at the same RPM, always! (Exactly what RPM depends on what units you use for power.)
In SAE units, HP is defined as (Torque * RPM / 5250). So those lines will always cross at 5250 RPM, assuming the engine was measured both above and below that RPM.
5200+ RPM is almost never the most efficient speed to spin your engine.