Considering that Volvo already uses an air-assisted system called PowerPulse to make the turbocharging setup spool faster on its Diesel cars, relying on an electric compressor and a storage tank to supply air to the turbine during starts or when faster acceleration is required, and that its working principle quite resembles the way an APU fitted to an airliner supplies air to start the engine #1, eventually an all-electric starter-generator to be connected to a turbocharger doesn't sound too unlikely at all.
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