Ok guys, I am new to this page from the second gen page. I have a second gen that I am building and have put a stock TPI setup on it. I am about to the point where I will need a wiring harness. I have the original 1988 harness, and am thinking about having it modified. I made a number of other conversions as well. I put a 1990 700R4 with some buildup in the car, dual electric fans, 1990 serpentine belt system. I need a harness/harnesses to accomodate this. Can one of you point me in the right direction? I have talked to painless and am not impressed. I also have the 1227727 computer for under hood mounting from a vette.

Doug

 

call howell engine development he originally worked for GM on the TPI stuff and I have heard he is the only one to use.
http://www.howell-efi.com/

 

I've used them all and the winner is:

http://www.speedscenewiring.com

 

Is the '88 harness from a TPI engine? If so, and you're running the 165 ECM, you should be good to go. The '88 TPI had dual fans, serp belt setup and a 700R4.

 

Oh, BTW, welcome to thirdgen.org.

 

Thanks guys,

I have sent email's off to the companies referenced. Anxiously awaiting replies. I am curious i had the 1227730 computer, other than water proofing is there any difference if used with the 1227727 computer? The A/C and alt are reversed since I used the 90 serpentine system, but I can probably handle something that simple. Funny, I can build engines all day long, but a little electrical stuff is foreign to me.

Doug

 

I'm converting my TBI truck to TPI....whats better .... to but a new harness or convert my TBI harness??

Thanks,
-Timbo-

 

I think Street & Performance seels a plug and play kit. They used to be at www.tunedport.com I am pretty sure it was based on the 7730 ECM.


Hope that helps,

Px

 

Hey Doug, I didn't realize you had the Vette ECM when I emailed you. Should be fine...I recall some guys on the PROM Board using the 727 ECM....maybe a trip over there, and post a question to see if they're compatible. But even if the 730 and 727 have differences, it shouldn't affect your swap as long as the harness plugs into the 727...I can't think of anything TPI/Engine-wise that's really different on the Vettes vs. F-bodies.

What didn't you like about Painless?

 

I think there's a Tech Article on the main page detailing this swap...check it out, should give you what you seek

 

Since GM didn't make a TPI harness for trucks, you're WAY better off converting your TBI harness to TPI. Speartech does a good job, as does SpeedScene. SpeedScene is a little cheaper tho.

 

Doug, run what you have. The '88 harness has added stuff like drivers side stuff like starter, headlights, gauge senders, which can be culled out. You will be able to use your stock 2nd gen wiring for that stuff.

 

Thanks guys, lots of great ideas. One of the problems with painless is they don't include much with their harnesses, have to have separate harnesses for everything. I like the design of the original which has most everything bundled together.

Doug