TBI to TPI....
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Joined: Mar 2004
Posts: 144
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From: Southeast Tennessee
Car: '91 RS, F41
Engine: 305
Transmission: WC T5
TBI to TPI....
I have an 87 TPI setup i want to put on my 91 camaro... will i have any problems swapping the computers? they look like they hook up the same, and i have the wiring harness for the engine bay.... to TBI engines have most of the same sensors as the TPI engines?
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: TBI to TPI....
Originally posted by flowmasterchevy
I have an 87 TPI setup i want to put on my 91 camaro... will i have any problems swapping the computers?---No.
they look like they hook up the same,---they do not. you have to repin the stock harness or get a new/different one.
and i have the wiring harness for the engine bay.... to TBI engines have most of the same sensors as the TPI engines?---Mostly the same. Knock sensor is different, TPS mainly.
I have an 87 TPI setup i want to put on my 91 camaro... will i have any problems swapping the computers?---No.
they look like they hook up the same,---they do not. you have to repin the stock harness or get a new/different one.
and i have the wiring harness for the engine bay.... to TBI engines have most of the same sensors as the TPI engines?---Mostly the same. Knock sensor is different, TPS mainly.
For the love of ***, SEARCH. This topic has been covered a thousand times.
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Joined: Jan 2003
Posts: 2,133
Likes: 4
From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
Re: TBI to TPI....
Originally posted by flowmasterchevy
I have an 87 TPI setup i want to put on my 91 camaro... will i have any problems swapping the computers? they look like they hook up the same, and i have the wiring harness for the engine bay.... to TBI engines have most of the same sensors as the TPI engines?
I have an 87 TPI setup i want to put on my 91 camaro... will i have any problems swapping the computers? they look like they hook up the same, and i have the wiring harness for the engine bay.... to TBI engines have most of the same sensors as the TPI engines?
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Joined: Feb 2004
Posts: 1,159
Likes: 2
From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
search for me on the tpi board as I just did this swap on my '92 using a system that just came off an '85 iroc and I used ls1 injectors and an accel base manifold. I ran into every problem in the book.
Joined: Jul 1999
Posts: 12,101
Likes: 127
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Re: TBI to TPI....
Originally posted by rgarcia63
If you have to pass emissons, early to late model swaps are not legal at least not in Texas.
If you have to pass emissons, early to late model swaps are not legal at least not in Texas.
-- Joe
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Joined: Oct 2003
Posts: 302
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From: Houston / The Woodlands, TX
Car: 82 ElCamino, looking for a 3rd gen
Engine: 305 TPI(427SB in progress) 730 $8D
Transmission: THM350 (Getting a 4L80E soon)
Axle/Gears: 10 Bolt w/ 2.43 gears :(
I would check with your states laws regarding engine swaps.
Here is some info for Texas engine swaps.
http://www.txdps.state.tx.us/vi/Misc/faq/engine.html
Here is some info for Texas engine swaps.
http://www.txdps.state.tx.us/vi/Misc/faq/engine.html
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
That law was made so that I could not put a carb on my car (older model) or to perhaps TBI and say "Yeah it is fine and pollutets less. It has been proven that TPI is more efficient, all around than TBI. The emmisions on a TPI car even include two catalytic converters. That is basically the same system that also came in the 90-92s (yes I know what the differences are). Go to a sniffer and you will pass more easily with the TPI.
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Joined: Apr 2003
Posts: 1,751
Likes: 4
From: Bonner Springs, KS
Car: 1995 Corvette
Engine: LT1
Transmission: 6 spd Manual
Axle/Gears: Dana 44, 3:45:1
If you adapt your TPI setup to a speed density system (repin your existing harness for the 730 ecm), then you can just say that you have a TPI out of a 91 Z28... I'm going to be doing just that (repin TBI to SD TPI) on my brothers '91 Bird this winter (although I don't have any emissions requirements)...
Thread Starter
Member
Joined: Mar 2004
Posts: 144
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From: Southeast Tennessee
Car: '91 RS, F41
Engine: 305
Transmission: WC T5
my main concern was using a non vats computer in a vats car... i can find alot of info about vats, but it never discusses that... anyone have any info on this?
Supreme Member
Joined: Apr 2003
Posts: 1,751
Likes: 4
From: Bonner Springs, KS
Car: 1995 Corvette
Engine: LT1
Transmission: 6 spd Manual
Axle/Gears: Dana 44, 3:45:1
yet another reason to use a SD setup.. 
Search around a bit, there are many great posts about TBI to TPI conversions (including ones that detail repinning your existing wiring harness to a SD TPI one)..
Search around a bit, there are many great posts about TBI to TPI conversions (including ones that detail repinning your existing wiring harness to a SD TPI one)..
Thread Starter
Member
Joined: Mar 2004
Posts: 144
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From: Southeast Tennessee
Car: '91 RS, F41
Engine: 305
Transmission: WC T5
what exactly is repinning? if i have a car with the V.A.T.S system and a computer without V.A.T.S, will it just work like a regular switch or do i need to do the bypassing technique?
Joined: Jun 2004
Posts: 918
Likes: 31
From: Las Vegas
Car: '88 Trans Am
Engine: 5.7L TPI
Transmission: Slushbox
Axle/Gears: 3.27
if you have a 90-92 tbi car(lo3) the 90-92tpi engine harness swaps into place change the fuel pump and go....if you had the 3.1 v6 you would change the dash harness as well as the eng. harness...
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