Audi is working on a type of electric turbocharger that spools the turbo ahead of the exhaust gas pressure, to eliminate lag . VW is working on one that uses an air compressor to pre-spool the turbo charger. And Eaton has an electric assisted supercharger that helps the supercharger spool, it can also can start the engine, and recover energy from engine braking.

I'm wondering if something like stored kinetic energy like that on the Audi e-tron (a carbon vacuum sealed flywheel) could also be used to ram air into the intake, and how much resistance the air would have against the stored energy.