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Old 04-11-2012, 06:41 PM   #139
Banned User
Join Date: Aug 2009
Location: St Louis, MO
Posts: 3,008
My Ride: 01 330x-xi
Originally Posted by Zak@ActiveAutowerke View Post
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.
Can you explain why it's not a great idea? If you take no risk you get no reward. I'm not saying this should be done or I would do it. I'm just curious why others don't and what factual information they have to back up, not doing it. If it's going to come down to risk vs reward leave the car stock. If it's coming down to hassle, don't mod it. I am only curious, nothing else. Perhaps a good place to start is what rpm the water pump needs to spin to maintain proper temps. Maybe you can run an oil cooler and the under drives? IDK, I just know it's not common for people to run pullies on s/c kits.
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