alternator help - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 3rd, 01, 07:33 AM Thread Starter
Join Date: Oct 2001
Posts: 5

i just put some power pulleys on my 1992 3.1 v6 camaro and was wondering if would be alright if i went to a bigger amp alternator and i also have a killer stereo in it and at night when i have my lights on and sitting through a drive through for food or at a stop light the car does not get enough juice it just dies i need some suggestion about getting a higher amp alternator or mabe just getting a bigger battery
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post #2 of 5 (permalink) Old Dec 3rd, 01, 09:07 PM
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Join Date: Aug 2001
Location: san jose ca usa
Posts: 503

No matter how high of an output alt you put on your engine your battery will still get drained at idle. Those pulleys you added make the alt spin to slow at idle to charge the battery so even a 120 amp alt will have no effect.

70 camaro 307 (350soon) /350th
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post #3 of 5 (permalink) Old Dec 5th, 01, 02:13 PM
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Join Date: Aug 2000
Location: DULUTH, GA.
Posts: 917
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Well, I have to agree with Joe and disagree with Joe as well.

I will start with the issue of changing to underdrive pulleys in an effort to save power. The power consumption savings are pretty nil these days. So, the problem is as Joes states that it is in that the pulley is not spinning the alternator fast enough.

Now on the disagreement level, larger capacity alternators do have higher charging rates at idle than lesser ones. In fact about 50% of the rating is generated at 1750rpms of alternator shaft speed with the provision, AND THIS IS THE BIG IF, that you have enough shaft speed to turn the self exciting alternator on!! If not, he is absolutely right on....the charging system is not working because of alt shaft speed.

And..not to mention I bet you have some subwoofer moving amp that requires wattage of a nuclear power plant to move and the two makes for problematic conditions.

YOu need to size your alternator and battery to the load that you have hooked up and make sure that the charging system will still charge under the most dire of circumstances or else you have what you have!

ConceptOne Pulleys and Brackets
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post #4 of 5 (permalink) Old Dec 5th, 01, 08:19 PM
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Join Date: Oct 2001
Location: milw,wi,usa
Posts: 159

sounds like your spending alot of money just for a 'few' horses that you probably can't even feel.I'd put the stock pulleys back on.Gm engineers spent alot of time figuring out those pulley sizes so all would work right.I don't know what those pulleys you bought cost but now your talking buying a bigger alt also.I'd put that money towards other power making items.
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post #5 of 5 (permalink) Old Dec 7th, 01, 04:57 AM
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Join Date: May 2000
Location: Westlake, OH 44145
Posts: 707

You need top add a backup battery!!!
Milan is offline  
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