FI retrofit, it's done!!! Options

[toon1]

I've been working on retrofitting newer fuel injectors for the 914. My goal was to find an injector that can utilize as many of the stock parts as possible.

I came up with a inj. off a 96 forn escort 1.8l motor.

One comment is needed, this will only work with an aftermarket FI system s these inj. are HIGH inpedence.

This setup gives the ability to use higher fuel pressure, 44psi . It has a lower flow rate than the stock inj.. so the pulse widths will be longer and should give a little better idle quality.

these are disc style rather than pintle( stock). fuel atomization will be much better giving a cleaner, more efficiant burn.

The length of the inj. where shorter than stock so I added an O ring to make up the difference.

The plastic tips are different ,I cut them off and put the tip of the stock inj. on the new inj., fit perfect. now the stock tip O ring can be used.

the fuel rail was machined to tolerance for the top O ring seal. And I made a bracket to support the fuel rail from vibration and also keeping it from popping off the top of the inj.

Here's the setup assembled. enjoy

[toon1]

more

[toon1]

one more

[jimkelly]

toon1 you are the man - keep us posted as to performance gains : )

[BMXerror]

Who did the machining? Looks good.
Mark D.

[toon1]

Thank's, I did all the machining, I'm not a machinest so I kinof muddle through it. I have acess to tons of equip. at work.

[yarin]

Great stuff! Thanks for posting pics!

I'm going to try something similar myself along those same lines. I'd like to move away from stock injectors to something high impedence thats also newer than 35 years old.

What injector connectors are you going to use?

[toon1]

Great stuff! Thanks for posting pics!

I'm going to try something similar myself along those same lines. I'd like to move away from stock injectors to something high impedence thats also newer than 35 years old.

What injector connectors are you going to use?

I'm using the connectors that go with the inj's., I got the inj. wire harness when I got the inj.

I finally got this done and the motor is torn down. It will be awhile before I get to use them (IMG:style_emoticons/default/mad.gif) I'm real anxious to see how they work (IMG:style_emoticons/default/biggrin.gif)


I'm supprised this went down the board so fast (IMG:style_emoticons/default/dry.gif) I figured more people would be interested. to my knowladge, this is the first ever retro of a non stock inj. utilizing almost all the stock components.

Even though this is for MS users only, this could open up possibility's to other retro fit's.

OH well, this will make the MS guy's happy, we now have a viable alternative to the stock inj's. These are more than readily avail. and cost $40/4, at PP. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif)

Keith

[swl]

I really like the manifold you built. I know we don't have flow issues on the teener but the billet just looks better than the stock pipe. Will there be enough room to drop the engine with the manifold in place?

Allowing my mind to wander much farther than it should...

If the impedence mismatch is the only thing that prevents using that injector on a stock d/l-jet could someone design a driver pack for it? Use the stock injector signal as input to a fast response driver and wire the output to the new injectors?

There would still need to be a way of compensating for a different flow rate (no chance the two have the same flow rate). That could be done grossly through the pressure regulator then fine tuned as per normal with the richness adjustment.

Am I being too simplistic?

[toon1]

I really like the manifold you built. I know we don't have flow issues on the teener but the billet just looks better than the stock pipe. Will there be enough room to drop the engine with the manifold in place?

Allowing my mind to wander much farther than it should...

If the impedence mismatch is the only thing that prevents using that injector on a stock d/l-jet could someone design a driver pack for it? Use the stock injector signal as input to a fast response driver and wire the output to the new injectors?

There would still need to be a way of compensating for a different flow rate (no chance the two have the same flow rate). That could be done grossly through the pressure regulator then fine tuned as per normal with the richness adjustment.

Am I being too simplistic?

the biillet fuel rail was necassary to utilize these inj.. They have an O ring ontop not a barb.

NO the inj,s and fuel rail will need to be removed for an engine drop.

If you could design a cheap, and easy way to use high imp. inj. with the stock syst., THAT WOULD BE HUGE!!!!!!!

There are plenty of inj's. avail. with flow rates close to stock that are much cheaper and readily avail. . I chose this inj. because I was going to use a different FP and wanted a higher press. fuel system for better atomization.

This would give everyone the ability to use the stock FP and REG and just change the inj's.

It seems Everyone here has been looking for a viable alternative to the stock inj. ,

Keith

[swl]

If you could design a cheap, and easy way to use high imp. inj. with the stock syst.,

'fraid my days of playing with electronics are long passed. When I last fiddled with design the Apple II and TRS80 were fighting for top dog honors!

But I know we have a bunch of bright young electronics guys on the board - maybe they could take up the challenge.

[brer]

(IMG:style_emoticons/default/clap56.gif) I'm impressed.
Keep us posted on your work.

[Mueller]

nice job.....

for "brand" new Ford (and other) injectors along with new connectors, check out this place.... fiveOmotorsports, I bought 8 new injectors for my truck for about $300...

[yarin]

nice job.....

for "brand" new Ford (and other) injectors along with new connectors, check out this place.... fiveOmotorsports, I bought 8 new injectors for my truck for about $300...

Thanks for the link!

I believe this IS a first for using aftermarket injectors on a stock intake system. Very nice work! I hope to follow someone soon.

[greybeard50]

This is exactly what I was contemplating for my T4 build, & I am glad you have chosen to be the "Trailblazer" so to speak.
However, I do need a bit more information or clarification. I cannot follow your customization of the new injectors. adding "O" rings here & changing the tip there is a bit crytic for me & I beg for more clarity.
Also, you indicate 4 injectors are available for $40 at "PP". I do not recognize the store. Please help. Do you have the part number for the injectors?

[MecGen]

Hey Thumbs Up ! (IMG:style_emoticons/default/clap56.gif)

Thanx for saving a lot of time for other teeners looking for an option. Thats exactly how I would of done it.
The "easy to source" injectors are half the ball game. There doesn't seem to be another option for for the inj rail, modifying one would be the same work=$$, and yours look sweet.

Looks like a well thought out project (IMG:style_emoticons/default/popcorn[1].gif)

+Karma
Later

(IMG:style_emoticons/default/beerchug.gif)

[type11969]

5.slow injectors work too and can be readily found on ebay for cheap (for 8) since those mustang guys are always upgrading.

Nice work btw!

[Dominic]

Nice work! (IMG:style_emoticons/default/beerchug.gif)
I'm interested to see pictures of your wiring harness. Will it be cutom made?

[toon1]

This is exactly what I was contemplating for my T4 build, & I am glad you have chosen to be the "Trailblazer" so to speak.
However, I do need a bit more information or clarification. I cannot follow your customization of the new injectors. adding "O" rings here & changing the tip there is a bit crytic for me & I beg for more clarity.
Also, you indicate 4 injectors are available for $40 at "PP". I do not recognize the store. Please help. Do you have the part number for the injectors?

Nice work! (IMG:style_emoticons/default/beerchug.gif)
I'm interested to see pictures of your wiring harness. Will it be cutom made?

Since the interest is growing , I will post more detailed pics. with regards to tip changing and other ?'s

Grey beard, if you look at some of the pics. you will see how I added an O ring to the new inj.body, above the stock 914 O ring. the new inj. was shorter, overall length than stock and the O ring added above makes up the difference for utilizing the 914 mounting hardware.

there is one pic. with the inj. side by side , the inj. on the left has the stock setup for the Ford escort. I cut that off and replaced it with the stock 914 plastic tip and seal.

PP stands for pick and pull, junk yard

Dominic, I am running MS so the wire harness is made for the MS system. I will use the inj. connectors that came off the escort and wire them into my harness. This is a great setup, the escort connectors fit real good, have seals and snap into place with keeper clips on the sides.

A little more info:


These injectors have a large size O ring on the top, 13.5mm, it was hard to find a drill or mill that would work. 1/2" is too small and 9/16 is too big.

I found a 9/16 end mill that had been resharpened and it was the excact size I needed. That was one of the most difficult parts of the project.

Keith

[yarin]

Hey Keith,

Sorry to dig up this old thread, but I was just thinking about your accomplishments and how everything worked out a few months down the road. Any issues with the connectors? Any MS tuning issues? You running 44psi with an adjustable FPR? I'd like to take on a similar project this winter and do the same.

I want to move away from factory injectors and PWM if possible.

Hope all is well.
--Yarin