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Check out phantom electric superchargers. They are using electric motors to drive centrifugal compressors.
They have dyno proven results in several types of cars.
Unfortunately the systems are rather small however I wonder if two systems one for each turbo could work on the S55.
Compounding turbo technology could be an alternate to turbo upgrades, by pre-pressurizing the air charge the pressure ratios are multiplied and the stock turbos can produce higher than normal boost pressures more efficiently.
Thoughts?
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