CPI injection, got links?

Knuckle Dragger · 02-14-2012, 08:20:23 PM

Looking for information on using the CPI injection system GM ran on the 95+ 5.7 trucks. Anyone have suggestions on where to look for info? Websites showing the conversions, harness modifications and/or system adaptability to run with a performance orientated engine? Really not a lot out there that I’ve found so just about any direction would be helpful.

I want to make sure it’s a feasible swap before I start to gather the intake, harness etc.

Leonards78LT · 02-14-2012, 11:27:57 PM

Quote:

Originally Posted by Knuckle Dragger

Looking for information on using the CPI injection system GM ran on the 95+ 5.7 trucks. Anyone have suggestions on where to look for info? Websites showing the conversions, harness modifications and/or system adaptability to run with a performance orientated engine? Really not a lot out there that I’ve found so just about any direction would be helpful.

I want to make sure it’s a feasible swap before I start to gather the intake, harness etc.

This is some general information, no schematics.
http://www.chevythunder.com/gm_cpi_a...i_19922004.htm

Knuckle Dragger · 02-15-2012, 01:23:37 AM

Quote:

Originally Posted by Leonards78LT

This is some general information, no schematics.
http://www.chevythunder.com/gm_cpi_a...i_19922004.htm

That was very helpful, thank you. I had forgot they used a cam and crank sensor. That's troublesome since i don't have the provisions for the crank sensor.

Leonards78LT · 02-15-2012, 01:58:54 AM

Quote:

Originally Posted by Knuckle Dragger

That was very helpful, thank you. I had forgot they used a cam and crank sensor. That's troublesome since i don't have the provisions for the crank sensor.

You can add the timing cover that was used on the 1996-99 Vortec engine, along with the crank sensor, and gear. It will require the use of a shorter snout balancer due the the thickness of the crank sensor gear, but it is doable.

Fbird · 02-17-2012, 10:15:17 AM

are you sure you want to use that PITA system with poppet valve injectors?
You are refering to the same CPI that was on the 95 Jimmy/Blazer 4.3 pos vortec.

linder technologies.....IIRC did alot of work on those systems.

camaro75LT · 02-17-2012, 02:52:18 PM

What's your goal with the spider injection system? There are a number of gm efi setups but that particular one has a multitude of issues.

Leonards78LT · 02-17-2012, 03:20:21 PM

The 1996 and later will be a better choice, as it has individual injectors, not just one "Maxi" injector used on the 1992-95 models.

Knuckle Dragger · 02-17-2012, 06:05:39 PM

Quote:

Originally Posted by Leonards78LT

The 1996 and later will be a better choice, as it has individual injectors, not just one "Maxi" injector used on the 1992-95 models.

It's my understanding they can all be upgraded to the individual injector deal. I'm not sure I want to deal with the crank sensor. Still not sure where I'm going with it.

Leonards78LT · 02-17-2012, 07:49:41 PM

Quote:

Originally Posted by Knuckle Dragger

It's my understanding they can all be upgraded to the individual injector deal. I'm not sure I want to deal with the crank sensor. Still not sure where I'm going with it.

There is a improved kit for the 1996 and later which is sequentially injected, it will not work on the single injector type used on the 1992-95 models.

arick793 · 02-19-2012, 08:50:57 PM

Here's the kit I think he's talking about http://www.theautoshop.net/VortecMPFI.htm

Knuckle Dragger · 02-19-2012, 11:18:52 PM

Quote:

Originally Posted by arick793

Here's the kit I think he's talking about http://www.theautoshop.net/VortecMPFI.htm

That's pretty cool, but I was thinking about the 96+ stuff Leonards78lt is talking about when I originally posted this thread. I didn't do a lot of work on the CPI stuff so my knowledge base is suspect regarding them.

Leonards78LT · 02-19-2012, 11:39:22 PM

Quote:

Originally Posted by Knuckle Dragger

That's pretty cool, but I was thinking about the 96+ stuff Leonards78lt is talking about when I originally posted this thread. I didn't do a lot of work on the CPI stuff so my knowledge base is suspect regarding them.

The link to the upgrade kit is what I was talking about, unless you are happy with the stock spider set up (should be called a "bug" since it has 6 "legs").

Knuckle Dragger · 02-19-2012, 11:59:11 PM

Quote:

Originally Posted by Leonards78LT

The link to the upgrade kit is what I was talking about, unless you are happy with the stock spider set up (should be called a "bug" since it has 6 "legs").

Didn't GM come out with a replacement part that has one injector per leg but it was all contained in the "body"

My hang up right now is opening the engine up to make the changes for the crank sensor. I was really wanting something where I could just change the induction system and go injection. TBI was my choice since it really doesn't change the overall look as much. But it just won't support much over stock HP. Not that I have a power house with an estimated 350hp. I thought maybe CPI but that's not looking like it's worth the work.

Leonards78LT · 02-20-2012, 01:29:47 AM

Quote:

Originally Posted by Knuckle Dragger

Didn't GM come out with a replacement part that has one injector per leg but it was all contained in the "body"

My hang up right now is opening the engine up to make the changes for the crank sensor. I was really wanting something where I could just change the induction system and go injection. TBI was my choice since it really doesn't change the overall look as much. But it just won't support much over stock HP. Not that I have a power house with an estimated 350hp. I thought maybe CPI but that's not looking like it's worth the work.

This is the link to gmpartsdirect:
http://www.gmpartsdirect.com/results...ber=PK93441235

I dont know why the picture is of a 6 cylinder set up.

RS1970 · 02-24-2012, 03:27:35 AM

If you want a easy "bolt on and drive away" EFI system take a look at the new one from MSD or the EZ EFI from FAST. Both are really straight forward. Simple to install and don't require any internal modifications (or even removing the intake). And as a bonus, no configuring junk yard parts to fit your car. By the time you piece together a junkyard system, modify your fuel system, source all the parts, get it installed, tuned and running. You could spend just a bit more and have a far superior setup in a fraction of the time with zero tuning. It's all plug and play. If you have everything you need on hand, its a one day install.

Oh yeah, and it will support a lot more power down the road and tune itself as you make changes.