Quote:
Originally Posted by cRiPpLe_rOoStEr
Though there are other ways to overcome turbo-lag, it might not be impossible to have both an electric supercharger and a conventional turbo, in a way similar to present-day twin-stage turbocharging or to what Volkswagen does with its TwinCharger setup that incorporates a mechanically-driven blower to provide low-end boost until the turbo kicks in. On a sidenote, BMW was experiencing with starter motors fitted to conventional turbochargers in a Diesel prototype, which seems to be the best idea as it not just overcomes the turbo lag but also doesn't waste the kinetic energy available in the exhaust flow.
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Interestingly, Audi's system is exactly what you're talking about.
On top, a standard 2-stage turbo, but piped in parallel is a smaller electric supercharger on a 48v system to overcome turbo lag.
Sam