can i use tbi ecm with tpi?
03-19-2006, 01:55 PM
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Car: '82 formula clone, 95 saab 900se
Engine: 350 vortec'd tbi, 2.0L turbo
Transmission: 700r4, 5 spd
Axle/Gears: 10 bolt 2.77 open
can i use tbi ecm with tpi?
i'm pulling a tpi system from an 86 t/a and swapping it into an 89 305 tbi firebird formula but there is no ecm with the tpi do i need to buy a tpi ecm or can i just have the tbi computer retuned or something?
03-19-2006, 02:45 PM
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Originally Posted by johnnyboy
i'm pulling a tpi system from an 86 t/a and swapping it into an 89 305 tbi firebird formula but there is no ecm with the tpi do i need to buy a tpi ecm or can i just have the tbi computer retuned or something?
RBob.
03-19-2006, 03:00 PM
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Car: '82 formula clone, 95 saab 900se
Engine: 350 vortec'd tbi, 2.0L turbo
Transmission: 700r4, 5 spd
Axle/Gears: 10 bolt 2.77 open
Originally Posted by RBob
The TBI ECM can work, but I wouldn't use it. Best bet would be to get a 1227730 ECM. This was used on the '90-92 TPI f-body's. Will need to do some re-pinning of the ECM harness connectors but other then that there are GM calibrations available for it.
RBob.
RBob.
i pretty much know nothing about computers
03-19-2006, 03:41 PM
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Repinning is easy, is the act of disengaging a pin from the connector and re-inserting it into another location. However, you do need to be able to follow a wiring diagram, or a list of connections to change. Over on the TPI board there is a long thread that is titled something to the affect "Converting from TBI to TPI."
This thread contains everything you need to know about the conversion.
Did the TPI engine come with a wiring harness? If so, it may be easier to swap that in place of the TBI harness. It would be a MAF setup for that year. I recommended the '730 ECM which is speed density. The harness would be different thent he '86 harness.
RBob.
This thread contains everything you need to know about the conversion.
Did the TPI engine come with a wiring harness? If so, it may be easier to swap that in place of the TBI harness. It would be a MAF setup for that year. I recommended the '730 ECM which is speed density. The harness would be different thent he '86 harness.
RBob.
03-19-2006, 05:26 PM
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Car: '82 formula clone, 95 saab 900se
Engine: 350 vortec'd tbi, 2.0L turbo
Transmission: 700r4, 5 spd
Axle/Gears: 10 bolt 2.77 open
Originally Posted by RBob
Did the TPI engine come with a wiring harness? If so, it may be easier to swap that in place of the TBI harness. It would be a MAF setup for that year. I recommended the '730 ECM which is speed density. The harness would be different thent he '86 harness.
RBob.
RBob.
03-19-2006, 08:47 PM
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Originally Posted by johnnyboy
yeah i'm going to pull the wiring harness with the tpi so what's different with speed density?
If the '86 TPI engine comes with the MAF sensor, wiring harness, and ECM, just bolt all of it in together. This makes it a simple drop in. Pull out the TBI harness and ECM and sell those on the classifieds.
RBob.
03-20-2006, 07:45 PM
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Car: '82 formula clone, 95 saab 900se
Engine: 350 vortec'd tbi, 2.0L turbo
Transmission: 700r4, 5 spd
Axle/Gears: 10 bolt 2.77 open
Originally Posted by RBob
A speed density (SD) system uses manifold absolute pressure (MAP), an intake air temperature sensor, along with a volumetric efficiency table to calculate the incoming air flow. A mass air flow (MAF) system uses the MAF sensor to directly read the airflow into the engine. Both systems use the airflow to figure out how much fuel to inject.
If the '86 TPI engine comes with the MAF sensor, wiring harness, and ECM, just bolt all of it in together. This makes it a simple drop in. Pull out the TBI harness and ECM and sell those on the classifieds.
RBob.
If the '86 TPI engine comes with the MAF sensor, wiring harness, and ECM, just bolt all of it in together. This makes it a simple drop in. Pull out the TBI harness and ECM and sell those on the classifieds.
RBob.
thanks for the advice
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03-29-2006, 09:21 PM
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Car: '82 formula clone, 95 saab 900se
Engine: 350 vortec'd tbi, 2.0L turbo
Transmission: 700r4, 5 spd
Axle/Gears: 10 bolt 2.77 open
what's the service number for an 86-89 tpi 305 ecm?
Last edited by johnnyboy; 03-29-2006 at 09:24 PM.
04-01-2006, 06:27 AM
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Originally Posted by johnnyboy
what's the service number for an 86-89 tpi 305 ecm?
1227165
88999194
88999128
The MEMCAL is the part that makes it fit a particular vehcile. It contains the calibration information.
RBob.
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