underdrive pulleys? go or no?
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Joined: Apr 2003
Posts: 270
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From: PA
Car: 2002 Trans Am WS6
Engine: LS1
Transmission: T56
Axle/Gears: 4.10
underdrive pulleys? go or no?
anyone who has purchased underdrive pulleys please share your experiences. i was debating making them(i work at a macjine shop at school) and was wondering what the dimensions are on the pulleys, also if there is really any benefit from putting them on, and any problems you experienced.
thanks!
thanks!
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Joined: Jun 2002
Posts: 6,819
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Have them, gives tad bit better low end. Supposibly increases mpg, takes tad away from charging.
IMO, you cant make one for the price of buying one.
IMO, you cant make one for the price of buying one.
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Joined: Jul 2002
Posts: 467
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Underdrive pulleys are good.
The only thing to make sure of is that you have a high output alternator. Throughout the years, there were many different kinds of alternators used. They varied from anywhere from 65, to 90 amps I believe.
If you happen to have one of the lower output alternators, and you've since added things like a high wattage stereo, or power door locks / mirrors, what have you, it might be a good idea to go with a newer high output alternator.
The only thing to make sure of is that you have a high output alternator. Throughout the years, there were many different kinds of alternators used. They varied from anywhere from 65, to 90 amps I believe.
If you happen to have one of the lower output alternators, and you've since added things like a high wattage stereo, or power door locks / mirrors, what have you, it might be a good idea to go with a newer high output alternator.
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Joined: Jul 2002
Posts: 467
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Hey Doward,
It must have come pretty loaded. Is it a Firebird? Did it come with that rare factory subwoofer option with the dual subwoofers in the B-pillars? That's a pretty sweet option. You would know you have it if you have a little button on your dash that has a little "musical note" on it. It might also say "Performance Sound" somewhere.
It must have come pretty loaded. Is it a Firebird? Did it come with that rare factory subwoofer option with the dual subwoofers in the B-pillars? That's a pretty sweet option. You would know you have it if you have a little button on your dash that has a little "musical note" on it. It might also say "Performance Sound" somewhere.
Supreme Member
Joined: Mar 2000
Posts: 13,414
Likes: 6
From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
My '86 has either a 105 or 95.. I forget... 
It came when you got air conditioning. 'Fact, my '84 parts car, with a/c, had the little 65 amp alternator. Not sure when the "larger" alternator started... somewhere between 84 and 86..
It came when you got air conditioning. 'Fact, my '84 parts car, with a/c, had the little 65 amp alternator. Not sure when the "larger" alternator started... somewhere between 84 and 86.. 
Supreme Member
Joined: Aug 2002
Posts: 3,827
Likes: 1
From: Gainesville, FL
Car: 1988 Chevy Camaro Hardtop
Engine: Turbocharged/Intercooled 3.1
Transmission: World Class T5 5 Speed
Originally posted by TomP
My '86 has either a 105 or 95.. I forget... It came when you got air conditioning. 'Fact, my '84 parts car, with a/c, had the little 65 amp alternator. Not sure when the "larger" alternator started... somewhere between 84 and 86..
My '86 has either a 105 or 95.. I forget...
It came when you got air conditioning. 'Fact, my '84 parts car, with a/c, had the little 65 amp alternator. Not sure when the "larger" alternator started... somewhere between 84 and 86.. A/C car. Yep, 100amp Altenator... it's one of my RPO codes, I don't remember which, now...
600 posts. :hail:
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Joined: Jun 2000
Posts: 2,937
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From: Moorpark
Car: 1991 CAMARO 1968 FIREBIRD
Engine: CAMARO 3.1L FIREBIRD 455
Transmission: CAMARO 700R4 FIREBIRD TH-400
I have mine and have loved them since day 1 just do the crank pully i did the alternator and it caused paoblems so i took that off and put on the stock one and all was good. the crank makes the biggest difference
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Joined: Feb 2002
Posts: 830
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From: Lehigh Valley, PA
Car: 00 T/A Firehawk
Engine: 346ci LS1
Transmission: MN6
Axle/Gears: 3.42 LSD
I have it on my car, this is an excerpt from my RPOs.
K60 : GENERATOR, 100 AMP
I have a 1990 Camaro RS with a 3.1 with A/C, power locks, and power trunk.
Just thought I would share! So if you got the letters K60 in your RPOs then you've got the 100AMP alt!
K60 : GENERATOR, 100 AMP
I have a 1990 Camaro RS with a 3.1 with A/C, power locks, and power trunk.
Just thought I would share! So if you got the letters K60 in your RPOs then you've got the 100AMP alt!
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