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Old 10-01-2012, 09:39 AM   #48
DSilk56
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Join Date: Nov 2010
Location: Miami, Florida
Posts: 819
My Ride: M-3 Convertible
Quote:
Originally Posted by nawewawe View Post
What is everyones opinion about a Under Drive Pulley kit? The sellers say it can free up horsepower up to 10hp? Is this true?
The 10 bhp claim is likely optimistic, however you can see some gain from going to an underdrive pulley. Just don't forget the tradeoff. With an underdrive pulley your ancillaries will be turning more slowly. This means your alternator, your water pump, your A/C compressor, and your power steering and brake booster. Slower rotational speeds mean less assist.
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