305tpi to a 350tpi computer ?'s
05-07-2011, 05:37 AM
#1
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Car: 86 trans am gta,and 88 corvette
Engine: TA-355ci tpi,vette 383 tpi
Transmission: 5spd manual,700r4
Axle/Gears: borgwarner 370 posi,vette is stock
305tpi to a 350tpi computer ?'s
the car is an 86 trans am ,the engine is a 88 5.7L from a corvette.now my problem is the engine runs on the 305 prom and esc(spark controll module)not very well i might add.but when i changed to the 5.7L prom and esc the engine will not start.the prom came from the vette that the engine came from but the esc is new.is there something that i am missing?
05-07-2011, 09:55 PM
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Car: 1991 Pontiac Firebird
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 2.73
Re: 305tpi to a 350tpi computer ?'s
I could be wrong but I think you need the computer from the vette as well. If it's the same TBI setup (which I believe it is, again I could be wrong) then the harness should be reusable. I tried the same thing once on my old 92fbird. I don't know why but switching out the proms made things worse. I had to actually switch the entire computer. In my case the computer from the donor vehicle hooked right up to my harness. Hope this helps.
05-09-2011, 07:52 PM
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 305tpi to a 350tpi computer ?'s
I know that in order to use a vette computer in an F-body. Some repinning of the harness IS required. Is the 5.7 prom from an F-body?
05-09-2011, 07:56 PM
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 305tpi to a 350tpi computer ?'s
You probably need F-body 350 knock sensor, F-body 350 esc, and definately an F-body 350 prom.
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