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#194693 - 03/22/06 11:01 PM TPI Wiring harness question for those that have converted.  
Joined: Feb 2005
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La Grange, Texas
I'm in the process of gathering TPI stuff for my 85 SS, and have 90% of what I need. I want to start with the MAF, and maybe move on to the SD later. For now I'm just staying with a very mild engine, and wanting a daily driver. I have an 88 MAF harness and computer from an IROC for the swap, and if I decide to go with the SD later I'll mod this harness if I use it.

Here is my main question for now:

The hole in the fire wall on the G body is round where the factory harness goes through, and the hole on the F body is square, and alot larger. For those of you that used a harness from the F body, what did you do to seal it at the fire wall? I can square out the round hole and make the harness seal work, but is the length on the rest of the harness good, or are there length problems? Would you have rather used a custom G body TPI harness now after looking back? I want this to be done right, and don't mind spending the money if a custom harness "is the way to go". But if the harness I have will work just fine, I don't want to throw my money one way when I could use it else where. If I need to cut the hole in the fire wall, I want to do it and fit everything before I have the body painted.
Thanks for your input,
Scott.



1987 Aero SS W/T-tops:
Iceman X-member, K&N, MSD, Energy suspension, Edelbrock, Hooker long tubes, 2-1/2 duals, x-pipe & Flowmasters.

1985 Monte Carlo: '99 Vortec 5.7L TPI/2004R, 8.5" Posi w/3:42's

#194694 - 03/22/06 11:55 PM Re: TPI Wiring harness question for those that have converted.  
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TPI Monte SS Offline
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TPI Monte SS  Offline
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North Jersey
The F-body engine bay is almost the same size and shape as the G-body (minus the strut towers). The F-harness fits nicely; almost like it was meant to be there. For the firewall, use a Dremel cutoff wheel and make your rectangle cutout, then just put some seamsealer around the hole after the harness is passed through. The computer will basically land right in the same place the original one was. If you need some pics, surf into my site, and start here - http://www.bowtiepower.com/hearttransplant.html


SSeeya,
Steve Ragusa - North Jersey
'88 SS - BudgetTourer - ZZ4-cammed 355 TPI, serpentine belt conversion, World Class 5-speed, 17" wheels, 12" front discs, Eibachs/Bilsteins, 1LE lower A-arms, tall lower balljoints, 34mm front swaybar, 3/4" straight rear bar, Celebrity headlights, and more. Sold on 2/28/11.
#194695 - 03/23/06 01:55 AM Re: TPI Wiring harness question for those that have converted.  
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85SSMan Offline
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Wichita, Kansas
I cut the square piece off of the TPI harness and put the round one from the Monte on the TPI harness. It works great, but probably takes as long as it would to cut the square hole in your fire wall.

Chris



1985 Monte SS, Rebuilt L69 with TPI. 200-4R Tranny. 951 Modine with TPI duel fans. True 2 1/4 Flowmaster Duals. B.F.H. made dual hump crossmember. Stock Suspension, interior, and body.
SOLD TO INTMDATR3 ON 03/04/06
#194696 - 03/23/06 03:23 AM Re: TPI Wiring harness question for those that have converted.  
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PB86SS/87LS  Offline
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New Berlin, WI
I did what 85SSMan did, worked pretty well for me. Then to seal it just use a butt load of black silicone on both sides \:\) .


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42
-81'Grand LeMans Safari Wagon 3.8 2bbl/200C/2.73
-07'TBSS Stockish daily driver
[Linked Image]
#194697 - 03/23/06 12:06 PM Re: TPI Wiring harness question for those that have converted.  
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Duts87SS Offline
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Spanish Fort, AL USA
So, do you just scrape, cut, and peel the square piece off?

I think I'm going to work on my IP harness adapter this weekend.


Dustin
87 SS
[Linked Image]
#194698 - 03/24/06 10:29 AM Re: TPI Wiring harness question for those that have converted.  
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z-villejw Offline
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Zanesville, Ohio
I'am also doing a TPI conversion. Where did you guys mount the relays? Steve, I looked at your pictures and you said you mounted them on the fender wells. The harness I have is out of a 89 camaro. Is the relay harness long enough to mount them on the driver side fender well in front of the washer bottle? I will be moving the battery to the driver side. If you had to extend the harness, how much? Thanks


1985 Black Monte SS Coupe TPI, 1968 427 Tri-Power RS SS Camaro, 2001 Corvette Convertible
My Motto is "Drive'm Like You Stole'm"
#194699 - 03/24/06 12:03 PM Re: TPI Wiring harness question for those that have converted.  
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TPI Monte SS Offline
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North Jersey
Quote:
Originally posted by z-villejw:
Steve, I looked at your pictures and you said you mounted them on the fender wells. The harness I have is out of a 89 camaro. Is the relay harness long enough to mount them on the driver side fender well in front of the washer bottle? I will be moving the battery to the driver side. If you had to extend the harness, how much? Thanks
I don't think the harness was long enough to go in front of the washer bottle, so I put the relays on the fenderwell in front the wiper motor and moved the washer bottle forward a few inches. On my old Monte, I mounted them right on the firewall; there's enough room back there to do that if you wish.


SSeeya,
Steve Ragusa - North Jersey
'88 SS - BudgetTourer - ZZ4-cammed 355 TPI, serpentine belt conversion, World Class 5-speed, 17" wheels, 12" front discs, Eibachs/Bilsteins, 1LE lower A-arms, tall lower balljoints, 34mm front swaybar, 3/4" straight rear bar, Celebrity headlights, and more. Sold on 2/28/11.
#194700 - 03/25/06 02:04 PM Re: TPI Wiring harness question for those that have converted.  
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La Grange, Texas
Thanks for all the info. I'll dig out my harnesses and try to decide which way I want to go with.

Steve, Your set up is really sweet. I see I have alot of ideas the will work. I was wondering about the swap and a few details, and after seeing your pictures, it really helps. May I pic your brain on a few things as I go.....Pleeeease?

\:D



1987 Aero SS W/T-tops:
Iceman X-member, K&N, MSD, Energy suspension, Edelbrock, Hooker long tubes, 2-1/2 duals, x-pipe & Flowmasters.

1985 Monte Carlo: '99 Vortec 5.7L TPI/2004R, 8.5" Posi w/3:42's

#194701 - 03/25/06 03:06 PM Re: TPI Wiring harness question for those that have converted.  
Joined: Aug 2005
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GearedSS Offline
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GearedSS  Offline
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stratford,ontario. canada
Quote:
Originally posted by z-villejw:
I'am also doing a TPI conversion. Where did you guys mount the relays? Steve, I looked at your pictures and you said you mounted them on the fender wells. The harness I have is out of a 89 camaro. Is the relay harness long enough to mount them on the driver side fender well in front of the washer bottle? I will be moving the battery to the driver side. If you had to extend the harness, how much? Thanks
I mounted my relays on the Firewall beside the brake booster. Just trying to keep the inners as bare as possible. \:D

#194702 - 03/25/06 08:08 PM Re: TPI Wiring harness question for those that have converted.  
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Clutch_Grabwell Offline
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Clutch_Grabwell  Offline
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Millbury, MA
Quote:
Originally posted by z-villejw:
Where did you guys mount the relays? Steve, I looked at your pictures and you said you mounted them on the fender wells. The harness I have is out of a 89 camaro... Thanks
I also started with an '89 harness, but ended up doing it the hard way... I separated the carb and emissions wiring from the Monte harness then added a Howell harness for the TPI.
Disclaimer: This is not a recommendation, but you asked about the relays... I added a hole for the harness in the firewall right behind the distributor and the wiring is routed under the HVAC box. The computer is in the stock location and the relays are mounted on a homemade panel behind the glove compartment. The original harness hole is used for fan switch and amplifier wiring.


1986 MCSS, T-tops, TPI 350, T56, 8.5" 3.42:1 Posi, cruise, A/C, ZQ8 brakes
All power: Windows, locks, mirrors, 8-way GTO seats
Concert Sound II, seven speakers, two amps
As seen in Hemmings Muscle Machines Aug. 2010
[Linked Image]
http://www.hemmings.com/mus/stories/2010/08/01/hmn_feature6.html
#194703 - 03/26/06 12:34 AM Re: TPI Wiring harness question for those that have converted.  
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z-villejw Offline
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Zanesville, Ohio
Thanks everybody for the help, I wiil be working on getting the relays mounted in that area. Thanks


1985 Black Monte SS Coupe TPI, 1968 427 Tri-Power RS SS Camaro, 2001 Corvette Convertible
My Motto is "Drive'm Like You Stole'm"

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