305 tbi to 350 tpi help
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Junior Member
Joined: Sep 2018
Posts: 11
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From: Florida
Car: 1991 Firebird GTX
Engine: 305
Transmission: T5 manual
Axle/Gears: 308
305 tbi to 350 tpi help
The 350 is coming out of a 89 gta 350 with a certificate of destruction that was an automatic car but my 91 is a 305 with a 5 speed manual, I was told I wouldn’t be able to get the 350 tpi to run with the manual car? Anyone know anything about this?
Joined: Dec 2004
Posts: 16,751
Likes: 995
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 305 tbi to 350 tpi help
the car will run with a manual transmission . However you will benefit form a custom tune.
Is the 91 tbi or tpi ? If it’s tbi I would add the injector pigtail and repin the ecm to a 1227730 ecm.
If its tpi already just get your memcal reprogrammed. Here is a thread on the 746 to 730 ecm.
https://www.thirdgen.org/forums/tpi/...d-density.html
Is the 91 tbi or tpi ? If it’s tbi I would add the injector pigtail and repin the ecm to a 1227730 ecm.
If its tpi already just get your memcal reprogrammed. Here is a thread on the 746 to 730 ecm.
https://www.thirdgen.org/forums/tpi/...d-density.html
Joined: Mar 2014
Posts: 4,553
Likes: 806
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 305 tbi to 350 tpi help
Sure it will. You will have to get a custom chip burned since there was no 5spd 350 cars but it will work. I'm soon to be swapping an L98 engine into my L03 car but am going with an upgraded TBI setup instead of using the TPI.
Thread Starter
Junior Member
Joined: Sep 2018
Posts: 11
Likes: 0
From: Florida
Car: 1991 Firebird GTX
Engine: 305
Transmission: T5 manual
Axle/Gears: 308
Re: 305 tbi to 350 tpi help
the car will run with a manual transmission . However you will benefit form a custom tune.
Is the 91 tbi or tpi ? If it’s tbi I would add the injector pigtail and repin the ecm to a 1227730 ecm.
If its tpi already just get your memcal reprogrammed. Here is a thread on the 746 to 730 ecm.
https://www.thirdgen.org/forums/tpi/...d-density.html
Is the 91 tbi or tpi ? If it’s tbi I would add the injector pigtail and repin the ecm to a 1227730 ecm.
If its tpi already just get your memcal reprogrammed. Here is a thread on the 746 to 730 ecm.
https://www.thirdgen.org/forums/tpi/...d-density.html
Joined: Dec 2004
Posts: 16,751
Likes: 995
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Thread Starter
Junior Member
Joined: Sep 2018
Posts: 11
Likes: 0
From: Florida
Car: 1991 Firebird GTX
Engine: 305
Transmission: T5 manual
Axle/Gears: 308
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Joined: Dec 2004
Posts: 16,751
Likes: 995
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 305 tbi to 350 tpi help
You could also find a harness from a 90-92 tpi speed density by posting a ad in the classifieds section.
If your not confortable repinning the ecm connector. Here are the connectors needed. If you need a ecm and or chip if you do decide to go speed density send me a pm for reprogramming and possibly a ecm if I have one at the time. I do have one right now.
https://www.ebay.com/itm/90-92-Camar...QAAMXQgb1RPrM4
Tpi maf can be done with the harness you have you just need to double check the firewall connectors pinout. This connector is called c100.
If your not confortable repinning the ecm connector. Here are the connectors needed. If you need a ecm and or chip if you do decide to go speed density send me a pm for reprogramming and possibly a ecm if I have one at the time. I do have one right now.
https://www.ebay.com/itm/90-92-Camar...QAAMXQgb1RPrM4
Tpi maf can be done with the harness you have you just need to double check the firewall connectors pinout. This connector is called c100.
Joined: Dec 2004
Posts: 16,751
Likes: 995
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 305 tbi to 350 tpi help
C100 pinout here so you can see if they are the same or different.
http://www.austinthirdgen.org/?pid=19
http://www.austinthirdgen.org/?pid=19
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