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EFI on a budget for my 351m

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  #1  
Old 03-14-2015, 09:18 PM
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EFI on a budget for my 351m

I have been doing a ton of research on this subject an I will be using the GM TBI set up .I have found wiring diagrams on what to use. I can source all the parts from the wrecking yard . The computer will need to be re flashed .I got my engine wiring harness from a 1990 suburban with a 350 v8 cause these harnesses are almost stand alone from the factory

"START HERE"--Fuel Injection FAQ--"START HERE" - Binder Planet Forums

This is where i found a lot of good info an the wiring diagrams
This build is going to take awhile as i'm doing everything my self like going though the wiring harness then making the TBI adapter. Okay here are some pics of what i got so far

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the last pic i have the harness weeded out of all unnecessary wires
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Old 03-14-2015, 09:50 PM
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More power to ya. You're a brave soul in taking on a GM TBI. Subscribed.

A couple of magazine articles for others' background:
Carburetor to TBI Conversion - Hot Rod Magazine
A Homemade TBI Conversion for $904
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Old 03-15-2015, 12:14 AM
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Been debating this for years.. Subscribed..
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Old 03-15-2015, 01:53 AM
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Good luck, to bad it says GM but it should work well I'll be watching.
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Old 03-15-2015, 09:52 AM
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My plan is to use this on my 78 bronco an my FE 390. Once i got things down to the basics it seems to be rather simple to do this type of project .The computer tuning is the only thing i for see to take a few tries to get it perfect. For the bronco i will be using the stock duraspark distributor. on the FE i will be making a hybrid GM/dursspark distributor . The goals are for quick starting an some more MPG'S
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Old 03-15-2015, 02:11 PM
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Interesting idea. Subscribed and looking forward to seeing your progress.
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Old 03-15-2015, 03:46 PM
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Have you considered the TB Ford set up used in the early to mid 80'S ??
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Old 03-15-2015, 04:15 PM
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Yes I did an I found more support for the GM TBI plus at the wrecking yard i work at there is a ton of GM TBI stuff to pick from an zero ford TBI stuff . I already have gotten all the GM stufff Well back to sifting though wires
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Old 03-16-2015, 09:43 AM
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Okay i got the first harness done today.I eliminated the EGR knock sensors an the ESC . These things will turned off when computer is reflashed. For timing control i'm using the ignition module out of the GM distributor along with the GM coil to. ok here some pics of the finished harness

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soldering wires
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I got it stand alone 2 grounds 1 batt 1 key on source. I will be using 2 relays on thw batt an key on wired
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Old 03-16-2015, 10:39 AM
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When I did my EFI, I used the power feeds to the Ignition Module. I cut the plug off the Ignition module then wired in some Diodes to power the Relay. The Ignition Module gets power at the start and run through this connector and the Diodes prevent power from backfeeding the other circuit. Worked a charm!

I suppose with a good sized Diode, you could power the EFI computer directly off these two wires kinda like how the Ignition Module does it.
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Old 03-16-2015, 01:42 PM
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I do not possess the skills to pull this off (yet) but have wondered how hard it would be to adapt this system onto something (anything) else. Subscribed.
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Old 03-16-2015, 01:53 PM
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sounds cool, i have thought about going with a holley terminator, or the eldelbrock multiport, but i have little money to use on the truck so that will be a while, but very sweet idea.
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Old 03-20-2015, 11:43 PM
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GM TBI will never be a high performance setup, so don't expect that. There is far more processing power in your cell phone than in that old brainbox. If someone were looking for a higher perfoming EFI the Holley Terminator, Edelbrock E-Street, MSD Atomic EFI, and F.A.S.T. EZ-EFI or EZ-EFI 2.0 would be a better setup. MSD and the F.A.S.T. 2.0 can also connect to the distributors made by those companies to control spark timing.
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Old 03-21-2015, 10:19 AM
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I used a junkyard Mustang 5.0 harness and computer, modified it for EDIS8 to get rid of the distributor, and used some adapter plates to mount a Lightning 351W lower intake to my 400. Runs like a champ and fully tuneable SEFI with the laptop.
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Old 03-21-2015, 08:58 PM
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High performance is not what i'm going for an all those aftermarket systems are way past any budget i could ever afford .I got the wiring harness laid out on the engine for a trail fit an to figure out whhere i need to fab up brackets for map senser an the ignition module .okay pic time

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Old 03-21-2015, 08:58 PM
 
 
 
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