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Old 04-11-2012, 07:22 PM   #138
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Join Date: Apr 2012
Location: Miami FL
Posts: 58
My Ride: '94 325is
Originally Posted by xixixi View Post
Tested or theoretical? I see people using them on turbo apps all the time. The water pump is spun much faster than needed. If you spin a pump that can only move x amount of volume at million rpms it still only moves what it was designed to move. I am in no way saying you aren't correct. Does anyone have some hard facts to back this? Does AA inform you not to under drive the pump?
There is no reason to run underdrive pulleys with a supercharger kit. Underdriving the water pump is not a great idea with a supercharger on the car.

Why take any risk AND add hassle to belt sizing etc for a net gain of AT BEST 5 whp.
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