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Many of the compressor wheels actually make boost between inducer and exducer, so...yes, the heat may very well still be there. And a problem with blowing off the boost is you have to recirculate it within the confines of your air-metering system.
And alot of the drag associated with the centrifugal blowers is in the gear-train and bearings...they overdrive the compressor wheel by up to 10:1 over the crank RPM (I would suspect in this application, maybe more). That is alot of power required, to overcome the bearing loads on the belt, the gear friction, and the boost generated at the wheel.
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" If you can't explain it simply, you don't understand it well enough. " - Albert Einstein
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