Converting from tbi to map tpi

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07-17-2004, 02:40 AM

87CIZ

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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?

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07-17-2004, 02:50 PM

anesthes

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Car: '88 Formula, '94 Corvette, '95 Bird

Engine: LC9, 355" LT1, LT1

Transmission: T5, Zf6, 4L60E

Axle/Gears: 3.42, Dana44 3.45, 3.23

Re: Converting from tbi to map tpi

Quote:

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?

Sounds like your doing the same thing I am.

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