305TPI to 350TPI
12-24-2006, 08:45 PM
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Car: 88 gta
Engine: 350 HSR
Transmission: 700r4
Axle/Gears: 3:27 borg warner 9 bolt
305TPI to 350TPI
What all needs to be changed on a 305TPI base to get a 350 to run like stock. Need also to know what is better 21 or 24 pound injectors.This is in a 88GTA please help.
12-26-2006, 12:55 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The factory used 22 lb injectors in 350s.
350 PROM.
350 knock sensor if different than 305 for your year (later ones weren't, forget off the top of my head what year they were the same).
350 PROM.
350 knock sensor if different than 305 for your year (later ones weren't, forget off the top of my head what year they were the same).
12-26-2006, 01:35 PM
#4
GMs use an "ECM" (Engine Control Module or Electronic Control Module). Fords use an "ECU" in their cars.
No, it doesn't need to changed. The PROM and MEMCAL need to be either changed for a stock 350TPI unit or reprogrammed.
The ECM is the same for many, many different engines, years, and vehicles.
The MAF works the same whether it is mounted in front of a 265 CID or 535 CID I/M engine. It provides a signal relative to the mass of intake air, and the ECM uses the signal in fuel trim calculations. The signal range is the same for all displacement TPIs. The only difference was in 1985, when a different signalling protocol was used. They were still the same in all 1985s whether for the 305 (F-Bodies) or 350 (Y-Bodies). That applies to TPI only, since the V-6 MPFI engines used a different signalling protocol and necessarily different MAF. It all changed again in 1993, but that doesn't apply to ThirdGens.
No, it doesn't need to changed. The PROM and MEMCAL need to be either changed for a stock 350TPI unit or reprogrammed.
The ECM is the same for many, many different engines, years, and vehicles.
The MAF works the same whether it is mounted in front of a 265 CID or 535 CID I/M engine. It provides a signal relative to the mass of intake air, and the ECM uses the signal in fuel trim calculations. The signal range is the same for all displacement TPIs. The only difference was in 1985, when a different signalling protocol was used. They were still the same in all 1985s whether for the 305 (F-Bodies) or 350 (Y-Bodies). That applies to TPI only, since the V-6 MPFI engines used a different signalling protocol and necessarily different MAF. It all changed again in 1993, but that doesn't apply to ThirdGens.
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