Some Garrett turbochargers can spin up to 280,000 rpm according to their site: http://garrettbyhoneywell.com/turbo-fundamentals/how-a-turbo-works/ http://garret

Some Garrett turbochargers can spin up to 280,000 rpm according to their site: http://garrettbyhoneywell.com/turbo-fundamentals/how-a-turbo-works/ http://garrettbyhoneywell.com/turbo-fundamentals/how-a-turbo... The motor/generator sits in the middle of the two turbines so that can help keep shaft length down but gearing 280,000 rpm down to something that wouldn't blow up the motor creates a whole new world of complexity. All I know is that this is very impressive engineering and that there are tons of unique innovations needed to make it all work together.