305 TPI swap
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Junior Member
Joined: May 2016
Posts: 2
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305 TPI swap
Hello. I'm looking for some advice on finishing up a 305 TBI->TPI swap.
I have a 1988 Camaro IROCZ 305 TPI (MAF) engine inside of a 1989 Pontiac Firebird Formula (which originally had a 305 TBI)
The engine wiring harness was burnt to hell in the car, pretty much beyond repair, and it lacked the relay connectors for MAF. So I'm looking around for engine wiring harnesses that would be the easiest to install or compatible. I already have the right computer/MEMCAL chip.
I've looked at Painless' GM MPFI harness (PN 60102), but it lacks the c207 connector in the passenger side under the dash. I did find a few 89' Firebird Formula 350 TPI harnesses, but my main concern is the wiring differences (i.e, the battery/EVAP cannister locations are reversed on mine compared to the 350 TPI formula firebird)
Does anyone have any recommendations for wiring harnesses that would be the easiest to install with these specifications?
Car: 1989 Pontiac Firebird Formula
Trans: Automatic 700R4
Engine: 305 TPI(MPFI) from 1988 Chevrolet Camaro IROCZ
Computer: 122 7165 (AKFR MEMCAL)
Any advice would be appreciated. Thanks.
I have a 1988 Camaro IROCZ 305 TPI (MAF) engine inside of a 1989 Pontiac Firebird Formula (which originally had a 305 TBI)
The engine wiring harness was burnt to hell in the car, pretty much beyond repair, and it lacked the relay connectors for MAF. So I'm looking around for engine wiring harnesses that would be the easiest to install or compatible. I already have the right computer/MEMCAL chip.
I've looked at Painless' GM MPFI harness (PN 60102), but it lacks the c207 connector in the passenger side under the dash. I did find a few 89' Firebird Formula 350 TPI harnesses, but my main concern is the wiring differences (i.e, the battery/EVAP cannister locations are reversed on mine compared to the 350 TPI formula firebird)
Does anyone have any recommendations for wiring harnesses that would be the easiest to install with these specifications?
Car: 1989 Pontiac Firebird Formula
Trans: Automatic 700R4
Engine: 305 TPI(MPFI) from 1988 Chevrolet Camaro IROCZ
Computer: 122 7165 (AKFR MEMCAL)
Any advice would be appreciated. Thanks.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: 305 TPI swap
Welcome aboard thirdgen.org.
Is the '88 still available to you?
Is the '88 still available to you?
Thread Starter
Junior Member
Joined: May 2016
Posts: 2
Likes: 0
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Look in the "Parts for Sale" classifieds forum, and post in the "Parts Wanted" forum. You'll want an '86-'88 MAF TPI harness ('85 may be okay as well, but I'm not sure about that) since that's what your engine and ECM are. '89 deleted the cold start injector, and '90-'92 were a different system (speed density).
Junior Member
Joined: Nov 2019
Posts: 1
Likes: 0
From: Charlotte, NC
Car: 1989 Formula
Engine: 305
Transmission: 700r4
Re: 305 TPI swap
305 TBI to TPI swap.
Hello all. I am in need of help; please. I have an 89 Formula 5.0 with a TBI system. I have a 91 Formula 5.7 as a donor car. What would I need to do to the 89 to convert the TBI over to TPI in the 5.0 (305)? Eventually, I will rebuild the 350 and put in the 89, but I'm just not to that point yet. Any help is appreciated.
Thanks,
Mike
Hello all. I am in need of help; please. I have an 89 Formula 5.0 with a TBI system. I have a 91 Formula 5.7 as a donor car. What would I need to do to the 89 to convert the TBI over to TPI in the 5.0 (305)? Eventually, I will rebuild the 350 and put in the 89, but I'm just not to that point yet. Any help is appreciated.
Thanks,
Mike
Member
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Joined: Apr 2016
Posts: 458
Likes: 171
From: East Moline, IL
Car: 88 T/A, 91 Formula, 94 Firehawk
Engine: 400 Pontiac, 5.0 TPI, 5.7 LT1
Transmission: 700R4, T5, T56
Axle/Gears: 4.10, 3.42, 3.42
Re: 305 TPI swap
305 TBI to TPI swap.
Hello all. I am in need of help; please. I have an 89 Formula 5.0 with a TBI system. I have a 91 Formula 5.7 as a donor car. What would I need to do to the 89 to convert the TBI over to TPI in the 5.0 (305)? Eventually, I will rebuild the 350 and put in the 89, but I'm just not to that point yet. Any help is appreciated.
Thanks,
Mike
Hello all. I am in need of help; please. I have an 89 Formula 5.0 with a TBI system. I have a 91 Formula 5.7 as a donor car. What would I need to do to the 89 to convert the TBI over to TPI in the 5.0 (305)? Eventually, I will rebuild the 350 and put in the 89, but I'm just not to that point yet. Any help is appreciated.
Thanks,
Mike
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