| some energy away from the rotating group of the engine, yes. But the amount of energy it requires from the crank/cylinder to do this work on a high-temperature, relatively low density gas is quite small. The primary energy source (thermal energy) for driving a turbocharger can be obtained without a detriment to the very element you are seeking to produce (power/torque). To drive a centrifugal supercharger sized for our engines at some ~18psi of boost will require about 75HP off the crank. The turbos will extract the same amount of energy via the thermodynamic energy available in the exhaust, thereby leaving that 75HP in the crank and only taking off just a few for the additional backpressure felt from the turbine.
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Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
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