[Angrybird 12]

Being an Electrical Engineering Technician, and Knowing what I know about Turbochargers, the speed you would need to turn the turbo would require a step up gearing to increase the speed from what the electric motor produces to provide sufficent boost. Being that it would take probably a few (1-5maybe) horsepower motor to get that kind of speed. that would increase weight and drain power from the battery requiring a bigger or aux altenator along with a secondary battery.
I would say the effiency is not there, you would be better to just go with a real turbo. simplier, more bang for the buck and less power robbing...

The electric turbo chargers I have see are no more than a fan to blow air into the intake, virtually useless.