Thread: Best Pulley
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      12-02-2012, 11:26 AM   #99
Drives: Jerez Black E90
Join Date: Sep 2007
Location: STL

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Is there any proof that the underdrive on the water pump actually has an effect in high rpm running? Many OEM pumps are on the right side of their envelope once you get within 2000 rpm of redline, underdriving the pump can actually help on-track cooling on some cars.
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