This was my line of thought. On a gasoline engine every horsepower you make you put one horsepower worth of heat into the exhaust and one into the cooling system. So if it took say 50 hp to bring the turbine up to speed plus 10 hp to compress the air at that speed you'd need say 60 hp worth of...
I am interested in figuring out a general formula for how much energy it takes to spin up a turbocharger if we know the diameter of the wheel,mass, target rpm, and time to go from stationary to full speed. The goal is to get a general idea of what engine speed is required to get a turbo to spool...