The New Holley Efi Terminator X for your Fox Body Mustang

First look at the new terminator x from holley for your sbf powered fox body

[@funkybassguy68]

This is by far the best explanation of this kit i have seen on YT. Makes it sound easy

[@xtreamcj3547]

Excellent explanation. You answered my questions. Thank you

[@mynameismyname5124]

Thank you so much for this video, I've been wanting to the digital dash for my fox. Now I feel much better about trying to tackle this myself!

[@sgan937]

Learning so much watching you guys, just have 2 many other things on in life atm.. one day.. thanks for the videos

[@kevin_nagle]

thank you for the video. currently using an Anderson PMS on a Vortech Si Foxbody. this looking like a great upgrade without going to an HP

[@eddierodriguez2472]

Great info brother.. im looking into doing something like this to my f100. but my favorite part was this @15:43 well said!!

[@topnotchaaron89]

Great video and step by step

[@kellyshotwell8681]

Perfect timing Devin

[@foxjunkie3013]

Great video!!!

[@ronbown3836]

I wanted to suggest something on your video. It's always good to ground your ECU directly to the battery. That eliminate any frequency noise and ground offset. Some ecu's have more than 1 ground.

[@theholleyefiguy]

ive made a few videos on wiring and harp on the main power and ground going back to the battery

[@waden404]

The routing "how to" is also what im interested in. This was a great video. Wiring absolitely freaks me the F out. Haaa

[@user-yh1vr5ch3r]

Great video, just unsure why Holley says to use the green wire to spice into the fuel relay under the drivers seat in there instuctions??

[@matthewpeterson4305]

Used to directly power a fuel pump (+12 volt). Do not use this wire to power fuel pumps that require over 15 Amps. This is what the manual says regarding the fuel pump and a relay.

[@frank3stangs]

Great video!! I have a turbo 347, 4r70w trans. I have the holley crank trigger. I don't use the TFI. How do I connect the trigger to the kit? Thanks!!

[@user-yh1vr5ch3r]

Holly says you can use that green wire to splice into the fuel pup relay under the drivers seat on a 87 fox ?

[@johnmarshall351]

Devin, I’ve been trying to find a good explanation about this kit for a while. And by gods grace I found your vid. I have a few questions, 1. Can this be used with the stock fuel pump, and fuel injectors? 2. Do I need to add a fuel pressure sensor to the fuel system?

[@kylerobinson6102]

Does this work well with a Dakota VXT Digital Gauge kit for the Fox Body? Anything I should know about before I buy it?

[@enchantedwenis4994]

Has anyone installed one of these kits with the 92-97 4r70w harness? I’m having a hell of a time getting the ECU to read vehicle speed correctly. I don’t get a mph reading until going around 10mph actual if plugged into the OSS sensor. If plugged into my VSS sensor, it reads half of my actual speed as in ecu reads 5mph when my speedometer reads 10mph and 8mph at 16mph (the 95 f150 speedometer reading comes from the VSS in the rearend, i installed a mustang VSS with 20 tooth gear in my trans tail section, I verified my dash speedometer with gps). After 4 attempts with Holley’s tech line, all I get are instructions on how to get my dash speedo to work or I’m told no one else has issues with it or there’s an issue in my trans.

[@thomasandkimcowieson8340]

Holley does sell a CAN to USB adapter. Part #558-443.

[@tufgriz8917]

So a single wide band 02 will work on a v8? how about a video on the setup wizard and auto tune?

[@cjfinch6238]

If I wanted to run the holley 4150 efi throttle body with this kit would it be plug and play for TPS & IAC?

[@Scrapla1]

You have to buy an extra harness to keep factory ac?

[@edgararevalo7081]

Hey great videos very informative I have a question with this kit on a fox the fuel pump runs on a relay already do you need to hook up the fuel pump wire for the Holley and if so can I use the stock relay and tap in

[@brianmiller4466]

Thats a very good question and the answer is no, not really. Lol! While you could prolly reuse the stock relay itself, its a standard 30A 12V relay. You cant use it the way Ford did off the final line. After looking over wiring schematics for the Fox Ponies I realized that the stock ECU turns the fuel pump on by switching the ground to the relay coil. Actually many items are controlled this way. By switching the negative the ECU doesn’t have to supply gobs of power. Basically, devices controlled by the ECU are turned on and off simply by switching the neg side on and off. Actually after a quick look at the schematic for the Terminator X it looks like Holley follows this strategy too. Also now that I think of it, if you ditched the factory ECU and harness(which includes the PCM relay) like I did, the stock fp relay is no longer connected to +12V. This is because its fed thru the PCM relay. That said you would run the green fuel pump wire from your new Holley harness to the spade #85, a ground(negative technically) to #86, a 12gauge wire from #87 to your battery and a 12gauge wire from 30 to your pump. FYI this is a for example. It is IMPERATIVE you size you wire and fuse it accordingly. A 12gauge wire is typically rated for 20A(NEC small wire rules). If you pump specs say it draws 30A a 10gauge would be required and so on. I believe a 16 or 18gauge will suffice for the relay coil as it doesn’t draw much current. Again be absolutely sure you install an appropriately sized fuse on the wire from the batt to #87 as close as possible to the batt to protect wiring(and you) from a short and or fire. Personally I tossed it and purchased a new 30A auto relay (same wiring configuration and pinout/spade #s). It even had a weather pack like silicone seal to keep the elements out.

[@trentdawg2832]

Can i run this on a 1967 mustang 289 with a efi intake or is it only fox body specific???

[@24gunsinc]

What about the EGR harness next to the the throttle body ?

[@johnbeebe1991]

Could you change the computer screen on this unit to a bigger one if you wanted to afterwards

[@ralphpineo9584]

Almost purchased a megasquirt, now I have more research to do and the price between the two is minimal.

[@johngunn7947]

What about the Max controlling a 4r70w?

[@TonyDFreestyle96]

HI Devin thank you for this vid. Question for you... on the TFI module adapter harness, is there a negative side coil wire or any coil wiring in the kit? Also for a boosted application street car (low boost) 5 to 10 psi max, do you recommend an ignition box with the holley and which npt pressure transducer style map sensor can I run? I see a 3.5bar from Holley. It that Ok?

[@brianmiller4466]

Uuh? Its in the installation instructions Dawg. Lol! White wire. Looks like 3.5bar is good for 50ish psi. Not sure how that works but Im figuring at sea level atmospheric pressure is 14.7 psi. So thats like 35psi of boost. Im looking to run same boost range on my 331 and ordered the 3bar. Hell thats still like 28psi. Just incase that intercooled TT kit I been lookin at goes on a fire-sale

[@rskybsns481]

"that's because it's a FORD and it has a DISTRIBUTOR, so..." 😂😂😂

[@daryldavis4074]

Got a 351w. Doing coil near plus. Do they make inition adaptor for cnp I see you show it for the distributor. But I am deleting ignition box and distributor

[@theholleyefiguy]

No you'll have to add your coil wiring in but can also run a universal mpfi cnp setup

[@TonyDFreestyle96]

HI Devin, can you recommend an oil pressure sensor that plugs into the holley harness and works properly?

[@theholleyefiguy]

www.holley.com/products/fuel_systems/fuel_injection/modules_and_sensors/sensors/pressure_sensors/parts/554-102

[@blk5pointO]

You know if the foxbody harness will be available separately for use with the hp?

[@theholleyefiguy]

i would assume so

[@couchfighter]

550-937 VS 550-937F..............Whats the difference? one is 999.00 one is 1129.00? cant see and difference in them. Any help wold be appreciated as I am getting ready to place the order. Thanks keep up the awesome videos!

[@Boosted89GT]

The 550-937 doesn't come with the sensors coolant, Intake airt temp, TFI harness or the seat bracket. I just looked it up today may go that route since 937f been on back order so long. A few stores have the 937 in stock but they are selling fast.

[@598bowtie]

Will this system be capable of doing dual solenoid boost control? Thanks and great videos “subscribed”

[@nsboost]

manuel ocasio Yes

[@598bowtie]

nsboost thanks

[@frmula1fan51]

$1200 + 6 hours of work + no mention of hp gains= maybe?? In all honesty, this thing has caught my fancy. I just have some questions that I been answered. 1. 2 o2 sensors. Is it possible to add a 2nd o2 sensor and have the ecu take advantage of it? 2. How does the system replace Ford's mass air system? How does the Holley system compare to the Ford system? How does Holley's replacement system work? 3. How future proof are these units? Will it work for the indefinite future without upgrades or electronic failure? Or is there signed obsolescence here? Thank you for your videos.

[@chrisadams6344]

Will this support the Holley coil on plug kit they have for the 351w? I’m doing a nitrous 408w

[@theholleyefiguy]

yes

[@chrisadams6344]

Can you adjust nitrous through the small screen or just laptop?

[@rdy2run332]

I currently have the iac valve blocked off on my car.can i keep it blocked off with the terminator x system without any troubles ya think?

[@theholleyefiguy]

Yes you'll be fine

[@curtschultz3997]

Do you think that this is better/easier tuning than megasquirt plug and play ecu? I currently have mspnp and I'm having a helluva time trying to tune my setup. Its a 331 sbf 76mm turbo 80lb injectors on e85.

[@theholleyefiguy]

im a bit biased but i find most of the tuner studios stuff to be absurd and complex for no reason

[@pjriver81]

How much cost that kit

[@hayden2408]

Does this kit allow you to run 2 02 sensors sorry if it's a dumb question I just saw it only came with one O2 sensor

[@theholleyefiguy]

No it doesnt you'll need a dominator ecu for that

[@rdy2run332]

Hey another question i was wondering what is the best safest way to get your switched 12v power? Is it ok to get a fuse tap and get the 12v from fuse panel?

[@mustangsquad3029]

That's what i did and it works fine, just watch, there is 2 fuse options that you could tap into, not sure which is which you will just have to test it, one gets key on power but it stays on for a pretty long time after you shut the car off, probably an hour or 2 when i tested it, and the other shuts right off with the key, make sure you test it so you don't drain your battery.

[@brianmiller4466]

😬😬😬 sure. Lol

[@boambuehl6255]

What do you have to do to run the factory air conditioning with this?

[@brianmiller4466]

Lmao! Read the damn directions and wire it. 🤨🤨 The A/C kick and shutdown are in the included I/O wiring. Basically go to the WOT relay. Hell, roll the windas down and screw the A/C. Just drive faster. Looks like the I/O is configureable. Use it for a boost controller or maybe lotsa spray! Ehh? Ehh? 🥳🥳🥳

[@thereddobermanfamily2945]

Can you still run a mass air if it’s just a N/A setup?

[@richd4819]

Why would you want to keep MAF?

[@lsxtmt4910]

A quick walkthrough video on how to update the firmware for terminator would be great for us noobs

[@rdy2run332]

So do you know how to wire in the fuel pump on a 92 foxbody.is it just like instructions say to cut power wire out of relay and splice in the green wire supplied in the holley kit and just cap off the cut wire in the relay. Basically can i just reuse my factory fuel pump relay? Any help greatly appreciated thanks.

[@Bobby4v]

Im having this issue right now. After removing my whole factory efi harness i dont have the factory relay anymore. Did you figure this out?

[@rdy2run332]

@@Bobby4v i think so i ended up getting the aeromotive fuel pump relay kit from lmr. Just gonna wire that straight to the fuel pump and then the gren wire will trigger the relay in the fuel pump kit.

[@Bobby4v]

@@rdy2run332 on thanks ill look into that. I thought i screwed up by removing the whole efi harness, even though that's what the book says to do. Lol

[@Precisionreelworks]

Any idea if this will work on a 1995 truck with a 5.0? I've got a very custom motor and have been looking for a decent standalone setup for a while 😁

[@enchantedwenis4994]

I’m doing the same thing. Four problems I have ran into, 1 had to buy a new distributor. I bought a distributor for 93 cobra as the fox body’s had the ignition module attached to the distributor. My 95 f150 module was remotely mounted. 2 had an issue figuring out if the Terminator VSS plugs into the OSS sensor or VSS in the aode, it goes into the OSS sensor, 3 the aode harness comes with a line pressure transducer plug and is already wired, the pins the instructions mentioned to assign are locked and are already assigned but I haven’t figured out how to get it to monitor. 4 the trans harness is not long at all if you want to use preexisting bulk head holes. Long enough if you want to drill a hole through the floor. Holley has not been very helpful or supportive through this whole process. But I understand there is a pandemic going on and I’m using a fox kit on a f150. I recommend the kit as long as you are running a manual transmission. I think this product was rushed in regards to the X Max. Edit: 4/8 still having issue with the advertised Line Psi harness but I made my own harness and programmed my own input for tuning my shift points. I bought a mustang VSS with a 20 tooth driven gear, moved the plug to the VSS sensor in the tail housing. I had to do math to figure out what rear gear ratio would read my speed correctly. Basically had to divide my rear gear by 2. The TermX Max VSS trans individual config looks for variable reluctance signal (analog) the TermX (non Max) looks for a digital signal (nice if they added this in the manual, months of forum BUMPing to get an answer) Now I recommend the kit with an auto trans, but only after months of trying to answers for seemingly simple problems.

[@rocsti5402]

@@enchantedwenis4994 how is it going? Did u have an e4od?

[@enchantedwenis4994]

@@rocsti5402 4R70W but basically the same

[@mrprfct7069]

Will this work on a fox with a 03 cobra drivetrain and/or a 2018 coyote drivetrain?

[@dennissmithjr426]

No go to power by the hour for your coyote swap stuff

[@brianmiller4466]

They make a Terminator kit specifically for the Coyote

[@mrprfct7069]

@@brianmiller4466 but they don’t make one for terminator

[@brianmiller4466]

@@mrprfct7069 Uuh? Yes, they do. Holley makes Terminator X kits for BOTH, the Modular motors(ie 4.6/5.4) AAAND the Coyote 5.0 www.holley.com/products/fuel_systems/fuel_injection/terminator_x/terminator_x_and_x_max_ford_kits/

[@roberthughart338]

Devin is setup compatable 1992 Bronco 5.0 a4od 4x4

[@livewembly]

Can this be adapted to a ford pickup with a 460?

[@Kingcadillac816]

I'm here for same idea

[@RyTrapp0]

Yes, it's listed as being made for the 5.0l, 5.8l, and 7.5l - if you have a factory EFI pushrod Ford, it shouldn't make a difference We just picked this up for my nephew's Fox with a mildly built 5.0l; and we have a 460 out of a '97 F350 sitting in the corner, waiting to be swapped in next season. With the TermX, the wiring won't take any effort at all during the swap

[@Mww393]

Is holley the only one who has the can to usb adapter. 53.00 for a cable seems a little ridiculous

[@harperjmichael]

I think there are others out there but not much cheaper. I agree, it's way too high for what it is and really needs to be included in the kit. They have a damn adapter harness for the WB, why not put the proper plug on it and save time and money. Then they could include the USB cable.

[@nsboost]

You can likely build one for $20. Holley is gouging everyone on transducers and stuff. Ridiculous

[@efraingomez6630]

Where are you located? I want to get one these installed on my fox!

[@kylerobinson6102]

Did you ever get one put on the car and if so how did it go?

[@efraingomez6630]

@@kylerobinson6102 Yes I did it myself instructions from holley are pretty straight forward it took about a half day. A local shop wanted $5500 to install and tune this honestly after doing all of I would encourage everyone to do it themselves.

[@kylerobinson6102]

@@efraingomez6630 I ordered the Foxbody Terminator X Kit from Summit Racing yesterday and intend to do the conversion myself. It's an 86 347 car thats currently running mass air. I am hoping for a smoother driving car overall, am very excited to be going forward with the project. Again; a local shop in Edmonton Alberta tried to tell me it would be over $3,000 dollars when I've read it's as little as 4 to 6 hours worth of work.

[@marcusfabiousmaximus3463]

The problem is when your still using air bags and AC and having to pull those wires out of the old harness

[@Scrapla1]

There's a company that makes a kit to keep your ac which comes with new wires and connections so you don't have to cut up your stock harness.

[@Wortheys_Garage]

Wonder how hard it would be to wire the headlights tailights break lights radio etc with the terminator x

[@kylerobinson6102]

I've got a Dakota VXT Digital Gauge cluster that I hope play's nice with this.

[@jrh0369]

How does this compare to the Pro-M EFI system?

[@theholleyefiguy]

miles ahead of it

[@angry408w7]

The pro m system is a completely direct fit for your year specific mustang where this is a universal fox body application. It uses factory oem connectors made by Ron Francis wiring. The ECU is a Ford ecu and us written by Ford engineers. The new pro m insight makes set up so easy. Also it now has full automatic transmission controls, traction control, nos, meth injecton, flex fuel capability, ethanol content sensor on the feed side not the return like on most systems and a fuel pressure sensor that protects the engine in case of a drop in fuel delivery. Not to mention one on one tech support with the owner of the company. Not some guy reading out of a manual.. You'd be hard pressed to find anything better on the market. If you want half a system for half the money, get the Holley....

[@jrh0369]

ANGRY 408W that’s what I was thinking. I like the idea of the Holley system but lacks some of the features of the Pro m. I believe he mentioned something of using a MSD box and other spark boxes to the Holley but Pro M eliminates the need for it. I’d say the only cons on Pro M is that it doesn’t come with the data log screen and the price.

[@angry408w7]

@@jrh0369 data log with your laptop. It's simple.

[@jrh0369]

ANGRY 408W I meant a screen to use as a dash.

[@Dtrent81892]

Hey buddy, i sent you a message on IG of a question i have about a holley DBW harness

[@dylansmith1826]

will this work with a cleveland?

[@theholleyefiguy]

yes if you have stock fox body sensors in it

[@shawnthomas6782]

What Holley efi do u recommend for a small tire 235 or 275 stock suspension street /drag car with nitrous oxide ls in a 4th gen Camaro

[@theholleyefiguy]

depends how much stuff you wanna control

[@shawnthomas6782]

This efi stuff all new to me I’m coming from the old carburetor days lol just building a new car after being out of racing for 10 years

[@jcnpresser]

Finally terminator for a ford engine, maybe the ls swaps will start to slow down, who am I kidding, probably not.

[@kingofthanorth]

jcnpresser 🤣😂.

[@jonathanallen8236]

Coyotes did that

[@dylancoppenrath5673]

jcnpresser it’s ok the less that know about the good stuff the better

[@roberthughart338]

E4OD

[@mtb09]

Looking on putting this on a 351w fox with a 4r70w. I am trying to figure out how to do CNP. Looking at using LS coils, a cam sync, and a crank trigger. Would it be worth getting the LS kit so that the coil harness is already pinned out then buying the 4r70w harness separate?

[@theholleyefiguy]

probably best bet yeah

[@angry408w7]

Or get the pro m kit and use a factory distributor. Comes with ls coils and plug and play harness.

[@daryldavis4074]

What is the pro m kit I am trying to do the same thing cnp

[@angry408w7]

@@daryldavis4074 www.promracing.com

[@mtb09]

The Pro M is $3k. I should be able to do terminator x for half of that.

[@jasonbrinegar6759]

I see it's been a few years since this video was released. But apparently here in 2023 Male Male works!! Just like BBCs in Foxbodys... 🤣 I kid I kid.... Don't hurt me when I attend a future class.

[@HandDriven]

Wish they would not use GM parts and utilize the ford parts. Just morelarts to source and more money to spend l

[@anthony8194]

This kit sucks. Doesn't come with sensors for plug and play as advertised. I already have a wideband installed and it's not the same connector. I had to cut off the coil wire and splice into the new harness because it doesn't come with it. Just so many issues!

[@tbone5448]

Plug and play 4 hours

[@theholleyefiguy]

thats including removal of stock stuff

[@scrappyclappedoutfoxbody4174]

Male male no good. Got it.

[@larrypruitt3919]

Shouldn’t be putting LS engines in fox bodies. Amen brother!!!!!!!

[@1calvin]

How can they call it plug and play when you damn near have to rewire the car, I'll stick with my original plan....MEGASQUIRT

[@yarbrouc1]

If your wiring and connectors are degraded by age than you’ll eventually have too anyways

[@lpatierno84]

Yeah it's def not plug and play like they say

[@1Unstang]

We all know most Fox Body guys are LS guys though.

[@theholleyefiguy]

its a shame isnt it ?

[@RScott413]

I deny that assertion entirely. The 4-bolt Boss block changed everything.

[@larrypruitt3919]

Actually they are Chevy guys that love fox body’s.

[@Oper8or]

Male male, no good. unless you changed your gender preference, but that does not work for wiring.

[@sinistersilverado965]

LS swap it

[@laciedelayne2aj68]

With the single o2 and no turbo would you swap back and forth to each bank to compare ? Im just trying to figure out what tuning issues only one 02 causes