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Originally Posted by UncleBob
how the turbo works is off of pressure differential. There must be more flow over the turbine than the compressor is producing....otherwise you have what we like to call "perpetual motion" 
Although PSI does not equal flow directly, its definitely related. |
The energy driving a turbine isn't just the pressure, it's also the temperature. The greater temperature differential you can get (i.e. very hot exhaust into turbine, cooler exhaust out) the less pressure differential you need.
It's not a perpetual motion machine until the compressor is doing more work than the turbine is creating.
I've got a spare thermocouple lying around, but I haven't yet measured the temp drop across the turbine.