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Old 04-30-2012, 03:31 PM   #1
MRPAT920
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Talking 87 TBI to TPI yes another thread..

well guys im moving up to the motor on my project K5 it has the stock tbi unit that needs a rebuilt so instead im doing a TPI install with a used unit i found at the offroad swampmeet

i know i need to replace the serpentine belt brackets to a camaro belt brackets..right??

i also need a in tank pump..right??
does any body have a good part # napa,carquest,zatozone


i also need a wiring harness who makes a good one or the best

heres some pics of the TPI i picked up..







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Old 04-30-2012, 04:17 PM   #2
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Nice looking unit I have one from a 91 T/A that I'm going to put on mine. Coolest looking intake ever IMO.

You will need a higher pressure pump but I don't know a part number. I'd do an adjustable fuel pressure regulator too.

As for wiring, I know there were a few places making conversion harnesses, but what are your plans for the computer? I'm not sure if the factory TBI computer will work with MPFI

I picked up the FAST EZ-EFI multi-port retrofit kit. It's self tuning and a standalone harness, so you literally just lay it out, plug it in and hook up some grounds. It's just an idea. Good luck with the swap, hopefully somebody else chimes in who can ACTUALLY answer some of your questions
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Old 04-30-2012, 05:10 PM
Posted in reply to Z71paramedic's post starting "Nice looking unit:thumb: I have one..."
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Originally Posted by Z71paramedic View Post
Nice looking unit I have one from a 91 T/A that I'm going to put on mine. Coolest looking intake ever IMO.

You will need a higher pressure pump but I don't know a part number. I'd do an adjustable fuel pressure regulator too.

As for wiring, I know there were a few places making conversion harnesses, but what are your plans for the computer? I'm not sure if the factory TBI computer will work with MPFI

I picked up the FAST EZ-EFI multi-port retrofit kit. It's self tuning and a standalone harness, so you literally just lay it out, plug it in and hook up some grounds. It's just an idea. Good luck with the swap, hopefully somebody else chimes in who can ACTUALLY answer some of your questions
an adjustable regulator would be cool since i need to drop the tank this weekend i can install the new intank and regulate it down until i get the tpi unit in..
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Old 04-30-2012, 05:44 PM   #4
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U will need to change the ecm but I'm not sure of the number. Someone will know or use the search, it has been covered before
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Old 04-30-2012, 06:43 PM
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MRPAT920
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is this the right fuel pump??

http://www.amazon.com/gp/aw/d/B000C9...g=533633849-20
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Old 04-30-2012, 07:04 PM
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For a stock replacement in tank pump, yes. Thats the one i used on my LS swap.
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Old 04-30-2012, 09:18 PM   #7
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Originally Posted by MRPAT920 View Post
well guys im moving up to the motor on my project K5 it has the stock tbi unit that needs a rebuilt so instead im doing a TPI install with a used unit i found at the offroad swampmeet

i know i need to replace the serpentine belt brackets to a camaro belt brackets..right??

i also need a in tank pump..right??
does any body have a good part # napa,carquest,zatozone


i also need a wiring harness who makes a good one or the best
There are a few options for wiring.
1. Build an underhood TPI computer and wiring harness (1990/91 Corvette clone), more or less like the one pictured here that I built. (Excellent wiring skills required)


2. Rework the current harness TBI for TPI. (Excellent wiring skills required)

3. Contact a custom harness builder like: http://www.larryselectricsite.com/st...hp?productid=2

The TPI pictures posted are for a MAF sensor type TPI. I recommend getting a 9th injector (cold start injector) block off kit, and use a MAP sensor TPI computer like the kit offered by Larry's Electric.

Here is the video of the TPI system I built running the engine on an engine test stand.



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Old 04-30-2012, 10:14 PM
Posted in reply to dave w's post starting "There are a few options for wiring. 1...."
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with the larryE kit will the truck pass smog with ???

Im not good at wiring at all im a full on idiot at that stuff lol so i perfer to get a plug and play kit

thanks for your help dave
9th injector block off is on the list..
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Old 05-01-2012, 05:36 AM
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with the larryE kit will the truck pass smog with ???

Im not good at wiring at all im a full on idiot at that stuff lol so i perfer to get a plug and play kit

thanks for your help dave
9th injector block off is on the list..
Pass Smog? That is a question for Larry's Electric.

If I had to pass smog, here is what I'd do.
1. Install a Vehicle Speed Sensor for TPI. The TBI is a different Vehicle Speed Sensor.
More info here on Vehicle Speed Sensors http://www.jagsthatrun.com/Pages/Spe...eedometer.html

2. Install a TPI Knock Sensor. The knock sensor for TBI is a different Knock Sensor.

3. Read up on all the local emission laws including the fine print!

4. Make sure I had all the emission equipment original to the TPI working correctly. (EGR, CCP, A.I.R, CAT, and what ever else was used back then)

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