Which EFI

a1machinista1 · Oct 23, 2023

I plan on using an aftermarket EFI on my next Foxbody. 302 daily. Which system for ease of install and ease of upgrades?

86HO5.0 · Oct 24, 2023

PimpXS.

Uses stock 60 pin connector, amazing support and versatility.

Bullitt347 · Oct 24, 2023

Holley Terminator X

AeroCoupe · Oct 24, 2023

If your factory harness is in good shape then Pimp XS or DYI AutoTune MSPNP2 or MSPRO3. If your factory harness is not all that great then Holley Terminator X with a custom harness to integrate into your dash wiring or Pro-M's unit.

I cannot remember who does the wiring on the Terminator X harness to adapt them to the Fox Mustang dash harness but I have seen it a couple of times on here and/or the Corral.

Essn95 · Oct 24, 2023

AeroCoupe said:
If your factory harness is in good shape then Pimp XS or DYI AutoTune MSPNP2 or MSPRO3. If your factory harness is not all that great then Holley Terminator X with a custom harness to integrate into your dash wiring or Pro-M's unit.

I cannot remember who does the wiring on the Terminator X harness to adapt them to the Fox Mustang dash harness but I have seen it a couple of times on here and/or the Corral.

MF Kustoms does the plug and play for the Terminator X

a1machinista1 · Oct 24, 2023

Isn't the whole idea of an aftermarket efi is to get rid of stock wiring?(efi)

a1machinista1 · Oct 24, 2023

How intrusive into the dash harness are these systems?

Noobz347 · Oct 24, 2023

a1machinista1 said:
Isn't the whole idea of an aftermarket efi is to get rid of stock wiring?(efi)

No, usually it's about running an updated CPU capable of accepting a custom tune and taking sensor samples at a much higher rate than the 30+ year old EEC-IV with limited adaptive capabilities.

a1machinista1 · Oct 24, 2023

Seems reasonable. Do the kits tend to be plug and place or splice and play?

Noobz347 · Oct 24, 2023

a1machinista1 said:
Seems reasonable. Do the kits tend to be plug and place or splice and play?

I have seen ample examples of both.

I really think it comes down to what sensors you want to use and how much capability you want to have on the table for "what if"s.

An example:

I run a stroker, 2.2L Kenne Bell, Pro-M 75 MAF, OEM harness (modified for MAF), A9L, with a 3-bank chip in the back.

I am thinking [hard] about going back to speed density... but not with a stock EEC. I want something that will take 2x Wide-band inputs, 3-Bar MAP, blow the TB out 80mm and have the whole thing run like a kitten in parking lots with [no] mass air meter.

I'm on the fence about the engine harness... Mine is in pretty good shape as far as I know (I'm the second owner) but I'm not so attached to it that it has to stay.

a1machinista1 · Oct 24, 2023

For example, my last Foxbody I believed had some connection issues with the 10 pins. The car was totaled before I had a chance to clean them up, which I believe was givimg me inconsistent and eradicate readings. How much of a role do the ten pins come into play with a new efi when I get a new Fox?

Noobz347 · Oct 24, 2023

a1machinista1 said:
For example, my last Foxbody I believed had some connection issues with the 10 pins. The car was totaled before I had a chance to clean them up, which I believe was givimg me inconsistent and eradicate readings. How much of a role do the ten pins come into play with a new efi when I get a new Fox?

They have a lot to do with it. The injector harness and sensors all go through there:

In your case, I'd swap the harness. Once you start running the wires to one sensor or one injector, at a time, it's not so bad.

Getting the old stuff surgically removed will probably take you longer.

a1machinista1 · Oct 25, 2023

So a new Pro Flo 4 for example still uses the factory injector harness? I would have thought that a new harness would be used and bypassed all the factory wiring.

TOOLOW91 · Oct 25, 2023

a1machinista1 said:
Isn't the whole idea of an aftermarket efi is to get rid of stock wiring?(efi)

That’s always been my take . Some guys disagree . Every ass has a seat.

To answer your dash question. Depends on what you’re doing .

You can keep stock gauges working as they do . Have to tap into 2 wires in fire wall plug . Same for tach and AC command.

Fuel pump relay wiring .

Otherwise that’s really it

This is pertaining to Holley efi .

limp · Oct 25, 2023

You tuber Chris Sullivan has installed a couple of ( I believe) Holly systems on his car projects.... His 69 LX Camaro has one and I think one of his corvettes got one... To somebody like me who has never fooled with FI, it was fairly easy to follow..... You might want to watch some of his videos.....

Mustang5L5 · Oct 26, 2023

a1machinista1 said:
Isn't the whole idea of an aftermarket efi is to get rid of stock wiring?(efi)

Not necessarily. First and foremost it's about updating the 30+ year old ECU's known for failures and something a bit more modern/faster with better tuning capabilities.

Wiring depends on the vehicle. There are plenty of vehicles out there with wiring that is dry rotted out and just failing in general. There are also cars out there where the wiring is in great shape and perfectly serviceable.

FastDriver · Oct 26, 2023

I have a BigStuff 3 on 2 of my cars, both built back before 2010, and I have the stock EECIV on my daily driver. I'd go with Holley HP, Terminator X, or PimpXS (or whatever @a91what told me to) if I were doing it over again, today.

On my daily, which is running pretty well, I didn't want to do a whole standalone kit Electronically, everything's working right, but it's running rich at idle and cruise, and needs 850-900 RPM to idle acceptably. It has a Pro-M 75mm MAF with 30 lbs injectors on a car with an e-cam & GT40 heads/intake. So, given how little I really want to do with it, I found a Moates Quarterhorse on FB marketplace for $250 that I intend to install and make only minor tweaks.

a1machinista1 · Nov 27, 2023

So I want to comeback to this topic since I have made some progress with the car. I found two broken vacuum hardliners on the bottom of the upper intake. It was sucking air and I believe the ecu was dumping fuel to save the engine. I fixed the upper intake. Taking the lower off tomorrow. I got new ACT, PCV, grommet and filter, both temp sensors, thermostat, 19lb injectors, a new wideband gauge.a new Ron Francis engine wiring harness.
This car has egt deleted, smog pump and all parts deleted. GT40 heads and intake. 2.5" catted xpipe Borla. After I get it all together and smoke tested I'm thinking I'm going to want to change the ECU? I'm looking at microsquirt, ms2pnp, pimpxs. I like the idea of having control of the parameters. I would really like to keep the ECU around $1k.. thoughts?

86HO5.0 · Nov 28, 2023

PimpXS. Amazing product and support.

Mcmahst · Nov 28, 2023

Noobz347, say more about using a Speed Density system for better performance. I’m using a totally stock 87 TBitd SD system on my 73 Mustang, and thought I would have to convert it to MAF to ever improve performance. How would I use SD with aftermarket performance parts? Is it just having a programable ECU via the laptop, using the stock sensors?

Which EFI

a1machinista1

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86HO5.0

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Bullitt347

I have been doing it wrong this whole time

AeroCoupe

lube between the nut and the face. I know my lubes

Essn95

a1machinista1

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a1machinista1

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Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

a1machinista1

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Noobz347

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a1machinista1

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Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

a1machinista1

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TOOLOW91

If you're the village idiot what's that make me?

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

FastDriver

I was uncomfortably high & wearing a helmet

a1machinista1

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86HO5.0

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Mcmahst

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Which EFI

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I have been doing it wrong this whole time

lube between the nut and the face. I know my lubes

Active Member

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Stangnet Facilities Maint Tech... Er... Janitor

Active Member

Stangnet Facilities Maint Tech... Er... Janitor

Active Member

Stangnet Facilities Maint Tech... Er... Janitor

Active Member

If you're the village idiot what's that make me?

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

I was uncomfortably high & wearing a helmet

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