wiring harness modifications
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
wiring harness modifications
I understand that the `84 TBI harness can be modified to run 8 or 9 injectors as commonly found in the 86-89 TPI setup (or perhaps more correctly as a 90-92 since the '84 vettes are speed-density). Since the `84 TBI has dual throttle-bodies / two injectors, it should be a pretty small leap forward to mimic the two banks of 4 injectors each on later TPI systems. Basically if anyone knows how to do this or knows of a good place to find directions, I'd love to see it. Also if I'm missing any important details. I'm doing a TPI conversion on the cheap and would really like to retain the dash cluster gauges functioning that *I believe* is lost when using a harness/ECM from later years. I've seen a few places that will do the conversion for anywhere from $250-$450, but if it's "simple" I wouldn't mind giving it a go `round.
And I know I'd be better off with a SR or MR etc, but the key words here are "on the cheap!" :p:
:cheers:
Oh, and I'm posting it here instead of the crossfire forum, since most of those guys wouldn't much care for my bailing on the Xfire... :lol:
[Modified by Ramanstud, 6:30 AM 11/13/2002]
And I know I'd be better off with a SR or MR etc, but the key words here are "on the cheap!" :p:
:cheers:
Oh, and I'm posting it here instead of the crossfire forum, since most of those guys wouldn't much care for my bailing on the Xfire... :lol:
[Modified by Ramanstud, 6:30 AM 11/13/2002]
Drifting
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Re: wiring harness modifications (Ramanstud)
Couple questions
1) What computer do you hope to use in the long run?
2) I guess that was my only question.
The ECM end connectors are going to be vastly different for 84 and then 85-91.
1) What computer do you hope to use in the long run?
2) I guess that was my only question.
The ECM end connectors are going to be vastly different for 84 and then 85-91.
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
Re: wiring harness modifications (HighHopes85)
Couple questions
The ECM end connectors are going to be vastly different for 84 and then 85-91.
The ECM end connectors are going to be vastly different for 84 and then 85-91.
thanks for the response...
:confused:
[Modified by Ramanstud, 11:57 PM 11/14/2002]
Drifting
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Re: wiring harness modifications (Ramanstud)
You don't need to use a 90-91 plenum. However, if you do, the plenum has a mounting pad for the MAP sensor. If you use the 85-89 setup, you will have to mount the MAP sensor somewhere not on the upper plenum and will just run a vacuum line to the MAP.
As far as everything else--I honestly don't know. I would think that the logic needed for the TPI is much different than that for the CF but I have never owned a CF setup.
As far as everything else--I honestly don't know. I would think that the logic needed for the TPI is much different than that for the CF but I have never owned a CF setup.
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Re: wiring harness modifications (HighHopes85)
Its MUCHO different.. I mean the engine charactersitics are different,
sensors are different, fuel pressure is TOTALLY different, ECM HAS to know whats going on, u can't jsut split it 6 extra injectors and see if they work.. Sorry bud, but it aint THAT easy.. lol
If it were, you'd be seeing ZR1 plenum / intake conevrsions on many TPI C4's too.. :D
sensors are different, fuel pressure is TOTALLY different, ECM HAS to know whats going on, u can't jsut split it 6 extra injectors and see if they work.. Sorry bud, but it aint THAT easy.. lol
If it were, you'd be seeing ZR1 plenum / intake conevrsions on many TPI C4's too.. :D
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
nevermind
yes... I understand there's a difference between 12psi and 45psi. Perhaps I should have made a point of - dare I say it - assuming the hardware swaps (that's a dangerous assumption I know- but baby steps!). The key words here are 'wiring,' 'harness,' and 'modifications!' I was just interested in whether or not the later sensors (90-91 manifold sensors, for instance) had the same wiring (not necessarily the same harness plugs) and be compatible signal wise should I try to retrofit them into an 84 harness. I.e. would the `84 ECM recognize the signal from a 90 MAP sensor- if I could even hook it up in the first place. I do not doubt there to be some bugs/hurdles for what I'm referring to, but I think it is an interesting question- well for anybody with an 84.... :p:
However, since I seem to have such difficuly conveying the purpose of my query... and to avoid further unneeded tangients- I'll apply my curiosity to the Big Book of Fuel Injection and see what turns up.
Thanks anyway.
:seeya
However, since I seem to have such difficuly conveying the purpose of my query... and to avoid further unneeded tangients- I'll apply my curiosity to the Big Book of Fuel Injection and see what turns up.
Thanks anyway.
:seeya
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Instructor
Joined: Jul 2002
Posts: 161
Likes: 0
From: Urbana IL
Re: nevermind (Ramanstud)
Please keep us informed if this progresses, I'm sure that there are sevral of us that would be interested, if it can be done, I would guess most of us haven't chimed in because we just don't know the answers, keep us posted, and good luck! :cheers: :smash:
