TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old May 12, 2004 | 02:09 PM
  #1  
john_iroc's Avatar
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From: Thunder Bay, Ontario
Car: 89 Iroc-Z
Engine: 305 TPI
Transmission: 700r4
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Hi, I have a 89 Iroc-z 5.0 TPI and just wondering if the stock alternator is 80 or 100 amps. The labels is off so I cannot tell. thanks!
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Old May 12, 2004 | 02:28 PM
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From: So. California
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Pro-Built Automatic/Vigilante 2800
pretty sure it's an 80
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Old May 12, 2004 | 02:45 PM
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john_iroc's Avatar
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From: Thunder Bay, Ontario
Car: 89 Iroc-Z
Engine: 305 TPI
Transmission: 700r4
ok, thanks can I just get a 100 amp one and it will fit perfect. The guy at the autoshop said it might have something to do with the computer so he said to make sure i get the same one.
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Old May 12, 2004 | 11:23 PM
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From: Las Vegas
Car: 1987 Formula (original owner)
Engine: 305 TPI
Transmission: T5
Axle/Gears: 9-bolt/3.45
I'd be surprised if amps decreased over the years. My '87 has a 105 amp alt, and I'd think your '89 does too. But you never know about GM, lol.

Oh, maybe the IROCs and the Formulas/TAs are different.
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Old May 12, 2004 | 11:29 PM
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From: Las Vegas
Car: 1987 Formula (original owner)
Engine: 305 TPI
Transmission: T5
Axle/Gears: 9-bolt/3.45
I just checked the Delco website, and you should have a 105 also. The 85 and 100 amps were on the LO3. The Delco part number is 321-383.
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Old May 13, 2004 | 12:16 AM
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From: So. California
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Pro-Built Automatic/Vigilante 2800
my mistake I thought the higher amp alts were on the 5.7 only
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