ZZP underdrive alternator pulley - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-06-2010, 11:59 PM   #11
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That'* a slightly smaller then stock pulley to spin the alternator a little bit faster.
Actually he said he has an under drive pulley. Slightly larger than stock and spins the alternator slower for a slight performance gain.
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Old 06-07-2010, 12:31 AM   #12
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Actually he said he has an under drive pulley. Slightly larger than stock and spins the alternator slower for a slight performance gain.
Which can over work and kill your battery over time
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Old 06-07-2010, 12:43 AM   #13
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Ya, for a daily driver, its usually best to leave little things like that alone. There is always a negative, and in this case, the performance gain is minuscule considering your undercharging the battery.
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Old 06-07-2010, 01:46 AM   #14
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I don't power a aftermarket stereo or anything. It only underdrives it by 14%. I think it would have worked, but I couldn't stop starring at it. I just kept popping the hood to check it. It was just making me too damn nervous, and like ya said, the performance gain was miniscule and not worth my anxiety
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Old 06-07-2010, 08:20 AM   #15
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Has any else installed a ZZP underdrive alternator pulley?
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That'* a slightly smaller then stock pulley to spin the alternator a little bit faster.
That would be an overdrive pulley. Underdrive means it spins less in an effort to save horsepower. ZZP has both the underdrive alternator and underdrive waterpump pullies. I don't understand why anyone would want to cut back on power production or cooling system performance. But...they sell them.
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Old 06-07-2010, 09:03 AM   #16
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My misunderstanding. Thought it was the smaller pulley. ZZP seems to make a lot of HP increase claims. This is not one I would use
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Old 06-07-2010, 10:34 AM   #17
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Wow, I think I skipped page 2. Sorry for the post with nothing new guys.

14% may have been a bigger thing than you realize. I started checking various connections and looking to bump voltage when I was scanning ign volts during some WOT runs. In my 97 I would see as little as 10 volts when the engine was looking for every bit it could get.
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