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
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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:
