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Originally Posted by serialk11r
If that were true, then electronic wastegates wouldn't be useful.
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But they don't decouple anything. Their purpose is to better direct the exhaust flow and to provide some eventual restriction as some sort of exhaust-brake.
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Spinning the compressor at part throttle is wasted energy because the precise opposite of what you need is more airflow and more pressure.
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It used to be more critical for older vehicles with either a carburettor or port-injection than with the newer direct-injection gassers, not to mention the downsizing trend.
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Converting that turbine shaft power to electricity is harvesting wasted energy.
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Just like some engines have an intercooler bypass for cold start maybe a compressor bypass could be tried, as long as some coupling from the center shaft of the turbo to a motor-generator is provided.