Best Efi Route

Saine65

Member
May 31, 2020
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Pueblo, CO
Sorry for the noob post, new here.

I'm wanting to build a 408w for my 65 and wanting to convert to EFI at the same time but not sure what route is best for me. Currently debating between foxbody intake (9.2 deck lower of course) and harness and carb-style intake with EFI elbow. Also unsure of what management system. At first i thought i would go Megasquirt with the foxbody stuff so it would be mostly plug and play but if I'm going to be installing a harness why not go with a holley terminator and get a new harness? Car will be heavily street driven with the occasional drag race/autocross weekends here and there.
 

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rbohm

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dump the fox body stuff, and go with something like the holley sniper on a four barrel intake. there are number of companies that are building similar systems, and the nice thing is that they are all self learning systems.
 

Saine65

Member
May 31, 2020
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Pueblo, CO
dump the fox body stuff, and go with something like the holley sniper on a four barrel intake. there are number of companies that are building similar systems, and the nice thing is that they are all self learning systems.
What would be the gain? I already have all the fox body stuff with 24# injectors, matching maf, a street heat intake, harness and computer ready to go on but I got it dirt cheap and wouldn't mind buying something better if it's worth it.
 

74stang2togo

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Mar 7, 2002
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dump the fox body stuff, and go with something like the holley sniper on a four barrel intake. there are number of companies that are building similar systems, and the nice thing is that they are all self learning systems.
This, but remember they are not all created equal.

The MSD Atomic is a pile of crap. I have it on my car, and will be selling it soon. It's no better on cold starts than a carburetor, goes through IAC motors about once a year, and takes FOREVER to "self-learn".

I also hear almost nothing good about Fitech or the Professional Products Powerjection product lines.

There are a lot of good ways to go EFI these days. You can even use off-the-shelf OE-style parts with aftermarket management from several companies these days to tailor-make a setup that runs the way YOU want it to. @a91what would be able to tell you a lot more than I could. I'm going back to a good ol' fashioned Edelbrock carburetor on my car in the short-term, and will, depending on which engine swap I go with in the future (playing with the idea of either a 351W or a Coyote), be consulting him on the best way to run the engine I choose to go with.
 

kevbot

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Mar 29, 2020
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What would be the gain? I already have all the fox body stuff with 24# injectors, matching maf, a street heat intake, harness and computer ready to go on but I got it dirt cheap and wouldn't mind buying something better if it's worth it.
If you want to sell the injectors and MAF let me know!
 

rbohm

SN Certified Technician
Apr 12, 2002
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What would be the gain? I already have all the fox body stuff with 24# injectors, matching maf, a street heat intake, harness and computer ready to go on but I got it dirt cheap and wouldn't mind buying something better if it's worth it.
reduced complexity for one. second you get a more vintage look with modern electronics. third you get an easier to tune and maintain setup. the holley sniper system has a control panel that mounts in the car so you can make adjustments on the fly if you choose. the EEC VI system is good but it is limited in its ability to adjust to changes outside the range of its programming parameters, and those are hard to change even with a tuner that adds another $800 to your budget, and they cant do on the fly adjustments.
 

wicked93gs

10 Year Member
Sep 30, 2006
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Why would go EFI and gimp yourself with a carb-type manifold? The whole POINT of EFI is to increase efficiency and carb-type manifolds are far more restrictive. Nowhere does any OEM since the mid 80s gimp themselves in such a manner. Look at manifolds like the Taurus SHO, the 4.6L Cobra engine, the infamous Olds quad-4, or any number of cross-ram designs to see what some of the possibilities are. As for control...Megasquirt all the way...it has far more capability than the Holley Sniper...and a far lower price(even for the top of the line MS3 Pro). Dont gimp yourself on standalone capability or intake manifold.
 

Stang_1973

Founding Member
Jul 13, 2001
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San Antonio, Tx.
OK, so i have gone from carbed 302 to FAST EZ-EFI 302 to my current setup Ford system 351 EFI based off the foxbody harness and computer.

To be honest, my favorite was the FAST EZ-EFI. I installed the system myself in my driveway. everything was literally EZ to do. The handheld programmer was straightforward and the car ran great.

I then had a lead on a 351 Roller setup that came with all the parts in my drivetrain sig. so i decided, what the heck, ill use them. I had always read about Ford wiring being tricky so i went with a guy who around here is well known for his knowledge of the classic mustangs as well the 5.0s. Now my isnt the best for a 351, theres still a ton of untapped power in there. However ive realized that it wouldve been easier for me to build power using the EZ EFI. Right now its harder to find EFO stuff for 5.8L but regardless of that. lets say i want to step up my intake, heads and cam combo to get around 400-450 HP, very doable from what ive read. I would need to go back and tune for those upgrades. With the EZ-EFI it would self learn. I could literally take it a step at a time. Right now unless i wanna pay for more retunes, id have to save up and get all the parts and then tune it.

Some systems now even allow for the use of power adders and still self learn i believe. Aftermarket EFI has come a loooooong way in the passed 10 years.

Im actually debating to go back to a carb style manifold and another efi system.

But if you already have the parts and are confident in what you want to do. go for it man.

Heres a guy thats been doing this build for sometime that i follow on youtube. check em out.
View: https://www.youtube.com/watch?v=VwXAhNWjVJY&list=PL_oEM8z39tKCW3RWsbKSSE90E5R968kOC&index=7
 
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