Quote:
Originally Posted by CanAutM3
The thrust load on the bearing is proportionnal to the load of the compressor itself. The less mass flow the compressor is pumping the less thrust (axial) load there is on the bearing. When the throttles are closed (or intake valves in the case of a valvetronic engine), the compressor does not need to pump much mass flow to maintain boost. So not much power is needed to maintain the boost level and not much power is required to overcome the friction caused by the thrust loading.
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True, at the lower engine operating range.....you can buy electric turbo's on ebay. They add no power that you can feel despite being driven by quite a large 12v DC motor.
