Which Efi System?

65FBE2 · Jul 14, 2012

I need some advice. I have a 289 a code with the stock Autolite carb redone by Pony Carbs before they closed. The carb is a work of art and I don't want to keep using it. I want to keep in it's concourse condition. The car is a driver and I am looking for a turn key kit that works. What have some of you guys used that has worked well? The motor has Doug Tri-Y headers and comp cam dual energy 214/223 @ .05 and .490 lift. Protronix in stock distributor. 3.25 gear with a T5Z

65FBE2 · Jul 14, 2012

Let's try this, has anyone used FAST EZ EFI? Or Procomps system? I would be great full for any feedback

bartl · Jul 14, 2012

Why not just get another 4100 and send it to Kurt Praxl (aka VMF "carbontooters") and have him go through it? If you're bound and determined to do EFI just bear in mind the requirements for some systems (electric fuel pump location, line size and construction, return lines needed, sensors needed, manifold, regulator, ECU, etc.

PhilJustPhil · Jul 15, 2012

65FBE2 said:
I need some advice. I have a 289 a code with the stock Autolite carb redone by Pony Carbs before they closed. The carb is a work of art and I don't want to keep using it. I want to keep in it's concourse condition. The car is a driver and I am looking for a turn key kit that works. What have some of you guys used that has worked well? The motor has Doug Tri-Y headers and comp cam dual energy 214/223 @ .05 and .490 lift. Protronix in stock distributor. 3.25 gear with a T5Z

I installed a Powerjection III system this spring and wrote it up in this thread:
http://www.stangnet.com/mustang-forums/threads/efi-conversion-experience-long.856312/#post-8614002

65FBE2 · Jul 15, 2012

Nice thread! It was very helpful. Big question, if you had it to do over again, would you do it the same way? What if any MPG improvements have you noticed?

rbohm · Jul 15, 2012

the easiest efi systems are going to be those that bolt in place of a standard four barrel carb, and have the capability of learning the engine on its own rather than you actually having to hook up a laptop or other device to tune the system. the holley projection is a good one to use, among others. as to fuel economy improvements, you might see 2-3 mpg due to the tighter control of the fuel mixture, but dont expect anymore than that. and even that is the best you can expect.

PhilJustPhil · Jul 15, 2012

65FBE2 said:
Nice thread! It was very helpful. Big question, if you had it to do over again, would you do it the same way? What if any MPG improvements have you noticed?

PhilJustPhil · Jul 15, 2012

Can't comment on milage, and still have a way to go in terms of tuning for peak performance... the Adaptive Learn is pretty good, but benefits from some additional tuning. For it to "learn" it has to spend a bit of time in each RPM/MAP cell, so as it "learns" full throttle at first there is a lot of stumbling and popping until it narrows in on the tuning.

Currently I'm trying to fine tune the cold start parameters as it needs a bit of work there. But once started it runs fine. The big improvement to me is drivability while the car warms up. All the old bad habits of the (electric choke) carb are gone. Start it, and it runs great right away. This is really noticable in colder weather.

iskwezm · Jul 16, 2012

I have had the Powerjection III for about 3 years now with no issues.

Rusty67 · Jul 17, 2012

Is there something wrong with the Ford factory mass air system ? EEC-IV with a moats and a good tune can do wonders.

golf4283 · Jul 17, 2012

I agree with Rusty. I went with the stock ford Mass Air setup with an A9L computer in my car. Parts are cheap and redily available over the counter or at the junkyards and you have yourself a geniune Ford product in your car.

The aftermarket systems all look nice as well but just seem too pricey for my taste. I put together my EFI swap for about $450 which included all the sensors, intake, throttle body fuel injectors etc.

Rusty67 · Jul 17, 2012

A little tip, you can flip the upper intake manifold 180* to run the TB out the the passenger side if you don't want to relocate your battery.

rbohm · Jul 17, 2012

the only issue with the ford factory efi system is that it is limited in stock ford to mild modifications. there are tricks you can use like higher fuel pressure, large mass air flow sensors, larger fuel pumps, etc. the EECv would be a better choice imo.

Rusty67 · Jul 18, 2012

Was the 94-95 Mustang EEC-V or just EEC-IV with EDIS ?

Thats why I sugested a Moats quarterhorse to tune the factory unit. It is still cheaper then going aftermarket EFI and it is mass air.

PoppyMod · Jul 21, 2012

Hi,
As was noted with the Powerjection III system, It would be helpful to have documentation posted noting the procedure, parts, and comments after the install etc., adapting the Ford systems to our older junk. I did this for the 65-66 T5 conversions and has been requested numerous times.
It's a nice learning and training exercise.

blown65 · Jul 21, 2012

The factory ford is a nice inexpensive way to go, but I personally dont care for the look of it on a classic.

Buddy just did the EZ-EFI and that works nicely. No ignition control however.
I'm not familiar with the others.

Rusty67 · Jul 21, 2012

Most of the aftermarket systems are speed density and require a lot more tuning. For a daily driver application mass air is better. If it is a hot rod/race car or weekend cruiser then speed density is just fine.

blown65 · Jul 21, 2012

That's true to a point but that ez-efi was very easy to setup and required very little tuning. It does pretty good at self learn and would be much more forgiving than a mass air system when you start adding cams and other crap that throws a tune off. At least the FAST is always trying to learn.

He installed it on a Flat Head ford that made 120rwhp, not exactly a race car.

Which Efi System?

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