Its only work for the engine at lower rpm, once the turbo spools up beyond inertial forces then any power loss essentially dissapears.
Unfortunatly in the case of a supercharger the faster it spins, the more power it takes to drive the supercharger.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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