Hi volume oil pump vs standard volume pump

And I can't see any reason for extra windage at higher RPM's for an HV versus standard pump. There is no more oil flow into the engine. Either pump at high RPM's flows far more than the flow requirements of the engine; the flow into the engine will be limited by the pressure (which is set at high RPM's by the relief spring, not the pump impeller height) and the engines restrictions. You would get MORE flow into the engine at high RPM's, and more windage, by using as standard pump with the higher pressure relief spring than an HV pump with the low pressure relief spring.