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88 GTA help with serp belt size

Old 02-01-2019, 06:38 PM
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Car: 1988 GTA Trans am 1 owner since new
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88 GTA help with serp belt size

ok
I have a 88 gta 305 tpi 5 speed and serp belt

I got a bbk underdrive pulley set 3 years ago

and I also got a/c delete and deleted the smog pump,

the smog pump is gone totally and the ac delete pulley I got from the parts store here works fine.
it took me a lot of trip back and fourth to get the right length but

now I want to put the stock crank and the stock water pump pulley back and stock alt pulley back on

I also want to keep the ac delete pulley and the smog pump delete

NOW ...

WHO KNOWS HOW LONG OF A BELT I NEED TO BUY

ty


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Old 02-01-2019, 06:56 PM
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Re: 88 GTA help with serp belt size

I KNOW! I KNOW!!! I KNOW!! ME! ME! ME!

The size equal to the length of a piece of string or thin wire (a single conductor out of a cat5 cable is PERFECT) wound around the pulleys, less an inch and a half or so for the tensioner.
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Old 02-01-2019, 07:15 PM
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Car: 1988 GTA Trans am 1 owner since new
Engine: 383 built
Transmission: 1995 camaro t56 6 speed
Axle/Gears: 3.24 posi 9 bolt
Re: 88 GTA help with serp belt size

i know how to do that

I just wanted to know if I should just get a stock belt size from the store to see if it fits
if anything it should be shorter a tiny bit

??

and just a fyi

the bbk pulleys work mint but they did not charge my alt and made the car not start I had to go to a local alt shop and dig though a pile and I got one that was 50% smaller then my charging went from 12.5 ideling to 14.7 where it was before

I did notice a power small power gain 12 hp ish but not worth all the money

I just wondered if anyone had done that setup before

and just knew a measurement
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Old 02-02-2019, 09:43 AM
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Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
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Transmission: 700r4 Automatic
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Re: 88 GTA help with serp belt size

Originally Posted by bensbaby View Post
i know how to do that

I just wanted to know if I should just get a stock belt size from the store to see if it fits
if anything it should be shorter a tiny bit

??

and just a fyi

the bbk pulleys work mint but they did not charge my alt and made the car not start I had to go to a local alt shop and dig though a pile and I got one that was 50% smaller then my charging went from 12.5 ideling to 14.7 where it was before

I did notice a power small power gain 12 hp ish but not worth all the money

I just wondered if anyone had done that setup before

and just knew a measurement

A couple observations. Sounds like your pulley setup is custom. Not sure how any internet guess will identify proper belt size. I'd take the earlier advice and measure w/ a string, but be sure to factor the play in the tensioner.

Also, the "alt" is not charged. It spins, providing a charge to the battery where the energy is stored.

I found by running a larger pulley on the factory alternator, they tended to "live longer", and I never burnt another one. High RPMs seemed to burn them up when I had the factory pulley in-place. This was of course, with high rpm operation. Hope this info all is helpful.
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