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Old 03-16-2010, 04:08 AM   #3
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Join Date: May 2008
Location: Orange County, CA
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My Ride: 325ci
Originally Posted by SL Blak Soldier View Post
correct me if i'm wrong, but underdrive pulleys don't make any power. they just make the accessories that are run off the belts use less of the motor's energy.
true, i believe how they work is by using a larger diameter pulley to create a reduction in the force it takes to turn them. thus, less engine power is consumed by the acessories.
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