Overdrive alternator pulleys from ZZP - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-03-2004, 03:57 PM   #1
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Default Overdrive alternator pulleys from ZZP

I was giving these a gander while brainstorming:
http://www.zzperformance.com/zzp/pro...ive_pulley.htm

Specifically the 5% overdrive alternator pulley.


Anyone here have information on the cost effective benefits these possibly provide?
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Old 07-04-2004, 06:04 AM   #2
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Anyone? I swear I'll start bustin' heads!
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Old 07-04-2004, 11:01 AM   #3
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I've looked at these before, there is a modest performance gain but imo a nice coolness factor with the brushed aluminum. The alternator overdrive will spin quicker giving a greater charge which is good for the big power users but not needed for stock applications.
Still its a cheap mod and would look great with aftermarket sc pulley.
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Old 07-04-2004, 11:28 AM   #4
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wouldnt it effect down on things like a/c???
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Old 07-04-2004, 04:51 PM   #5
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PontiacDad, I'm pretty sure its the other way around: The alternator will spin slower which will free up high rpm power.

The ZZP site claims a 5% overdrive is not enough to cause any problems with other electrical features.
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Old 07-04-2004, 04:56 PM   #6
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Quote:
Originally Posted by Allmachtige
PontiacDad, I'm pretty sure its the other way around: The alternator will spin slower which will free up high rpm power.

The ZZP site claims a 5% overdrive is not enough to cause any problems with other electrical features.
I went back and re read it. It was as I thought, overdrive for big stereos underdrive for high rpm.
Quote:
By spinning the alternator slower than stock you can free up some of the HP robbed in the upper RPM bands. The 20% underdrive is excellent for the track but not recommended for street use in cars with aftermarket stereos. The 5% overdrive alt pulley works great for cars with large stereos or extra electronics in the vehicle. All 3 of the pulleys are very lightweight and will reduce rotating mass. This is significant because at redline a stock alt pulley is spinning over 17,000 RPM!
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Old 07-04-2004, 05:12 PM   #7
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I assume because the Alt on my 93 is the same, it'll work for me? I'm interested in the overdrive pulley, since I have to push some subs around...

Good idea. I wonder if the DP units use an overdrive pulley.
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Old 07-04-2004, 05:15 PM   #8
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Actually the DP on my 94 seems to have an underdrive pulley, which would cause the alternator to work harder.
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