Converting from tbi to map tpi
Thread Starter
Joined: Apr 2002
Posts: 2,029
Likes: 2
From: Ohio
Car: 88' Iroc-Z
Engine: LQ9
Transmission: T-56
Axle/Gears: 3.42
Converting from tbi to map tpi
I'm looking to convert my 88 iroc that came with the 305tbi motor and replacing it with a 355. but i'm going to a 4 barrel intake and 4 barrel throttle body with the intake drilled and welded for injectors. What I'm trying to figure out is, What do i need to go from tbi to map tpi? I already have the 730 ecm. do i need an entire harness? would that be easiest?
Joined: Jul 1999
Posts: 12,098
Likes: 126
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Converting from tbi to map tpi
Originally posted by 87CIZ
I'm looking to convert my 88 iroc that came with the 305tbi motor and replacing it with a 355. but i'm going to a 4 barrel intake and 4 barrel throttle body with the intake drilled and welded for injectors. What I'm trying to figure out is, What do i need to go from tbi to map tpi? I already have the 730 ecm. do i need an entire harness? would that be easiest?
I'm looking to convert my 88 iroc that came with the 305tbi motor and replacing it with a 355. but i'm going to a 4 barrel intake and 4 barrel throttle body with the intake drilled and welded for injectors. What I'm trying to figure out is, What do i need to go from tbi to map tpi? I already have the 730 ecm. do i need an entire harness? would that be easiest?
ANyway, just need to repin your harness, and add the injector connectors.
Do a search for a thread by me. I did a writeup on the conversion.
-- Joe
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