EV14 GT500 630cc injector DIY
 

After reading some of the recent DIY attempts to get cheap EV14 injectors working and finally getting my turbo installed I figured I would try to make the cheap GT500 630CC BOSCH injectors work.

I found a set of the Motorcraft Part# CM5216 injectors for $102 shipped. You can find these all day long for $110.
http://www.oehq.com/oeparts_motcm5216.htm

You can look them up under 2013 Ford Mustang GT500 parts. I ordered new o-rings, bottom donuts and filter baskets from 300zxrb26dett on the forum. I found new EV14 connectors on ebay for around $4.50 a piece and will be making a new harness.

I had some ¾” round aluminum stock laying around so I figured I would try to make my own top hats, but you can find these for $40-50 bucks on Ebay. The EV14’s are a lot shorter than the old EV1’s, but by the time you open the lower opening of the hat to fit the EV14 (0.520”) and turn the upper portion to fit the miata fuel rail(0.410”) you end up with little or no material left in the transition area. Myfist one was made to exact same length as the old 1.6 injector I had laying around (from bottom donut to upper cushion seat). This left very little material and I ended up snapping the top off during trail installation, it was paper thin. I added about 0.100” to the length to add a little more material and it works great. I might have to add a thick washer on the fuel rail spacers or make new spacers.

The green lower o-ring supplied with the EV14 injector is too small to seal on the head/intake.I first thought a separate adaptor would be needed, but I tried replacing the green o-ring with one of the EV1 lower donuts and it works. As you can see inthe pics it is not a perfect fit, but the slightly increased OD of the donut on the one edge actually allows for a better seal on the head/intake. I had an old 1.6 intake manifold lying around and did a test fit. With some oil on the donut you can slip it in and it seals much better than the plain donut on an EV1 injector.I always wondered if the factory donuts seal under boost. I had a little harder time to get these guys to fit when installing it on the 1.8 head, but a little guidance from a long flat tip screw driver helps to get the donut guided in and sealing properly.

I was able toget it all installed this weekend with no leaks. I pinched one of the upper o-rings in the fuel rail and had a leaker on #3 during my first attempt. A little more lube and a new o-ring fixed that problem.

Next step is to wire up the new connectors and run new wire all the way to my MS2 for batch fire in the short term and eventual sequential operation. I am also wiring everything in for eventual COPs.

In one of the other threads there was a question about the injector squirting in a dual cone pattern to direct fuel at each valve, but looking at the injector tip it does not appear to be the case with so many holes in a circular pattern. I would expect these injectors to produce a single cone spray pattern. Has anyone tested theseto know how they spray? I was going to run some alcohol through them to see,but got excited and installed them instead.

The 1.8 installation does not allow a lot of room to rotate the connector around since the new injector sits much lower and the connector will contact the head in certain positions.

I will update the thread when I get it wired up and running.
https://www.miataturbo.net/attachmen...1&d=1401717948
https://www.miataturbo.net/attachmen...1&d=1401717948
https://www.miataturbo.net/attachmen...1&d=1401717948
https://www.miataturbo.net/attachmen...1&d=1401717948
https://www.miataturbo.net/attachmen...1&d=1401717948
https://www.miataturbo.net/attachmen...1&d=1401717948
Installed
https://www.miataturbo.net/attachmen...1&d=1401717948

Very cool. btw if anyone needs pre-made and good to go tophats for these, I have some ID1000 tophats for sale, as well as the clips for these injectors ;)

https://www.miataturbo.net/miata-par...s-plugs-78865/

Did you have to add any additional spacers to the fuel rail spacers to make those ID top hats work?

No. they should be plug in play.

I ended up making new fuel rail spacers to add the 0.100" height I added to the injector spacers. I tried it with the factory spacers and I got it in, but it felt like it put too much pressure on the injectors. The added height helped a lot and allowed the injectors to be rotated a little after the rail is bolted on.

I made a new injector harness with new connectors and some extra MS3 harness wiring my brother had left from his Cobra. I did some test runs in the garage with the injectors hooked up for batch fire using the current hardware. It ran great and had a smooth idle.

These ev14`s are much louder. I thought I had a squished lifter for the longest time, but after getting the oil to temp and some revving the sound never went away. The mechanics stethoscope helped me eliminate the lifters and made it clear it was the injectors ticking. I did some searching and it appears to be a standard thing with the EV14`s and not a concern. Removing the isolator that the factory injectors come with and having a tight lower o-ring seal is not helping since there isn't anything to absorb the impact and sound of the injector pintle slamming open and closed.

I have not driven with these yet, but it does look like they will work great. I have to finish the hardware upgrades to my MS2 so I can run sequential injection and finish the all new sequential wiring for the new COP setup.

Update:
I finally got the car back on the road after swapping these injectors in and going to sequential fuel and spark. These EV14's work great and idle much better than the RX7 460cc injectors I had before.

I have had some missfire and MS restet issues to deal with due to spark issues, but now that it is resolved I have been able to re-tune for the new injectors and it ildles, cruises and pulls very smoothly compared to the old injectors. Datalogs show smoother AFR response as well.

I have never driven a car with matched injectors, so I really couldn't say how these factory GT500 injectors compare to the aftermarket matched EV14's that are avaliable.

For $120 in parts it was well worth it.

Thanks for the info, I might pull my rx8 425 out and get some of these. I want to run e85

any long term reviews on these? These seem like a legit option vs the rx7 and rx8 injectors out there.

^^^^^^^^^ these are the number one goto injectors in the turbo miata world. I'm running them, no issues.

Number one? huh. thought my Id's were the good ones.

Injector Dynamics are great, but not every one needs 1000cc injectors and/or wants to spend $520 on a set.
so the flow force 640cc injectors at $300 are a good value, and are big enough for most people.

I have been running these GT500 injectors for almost 5 years now. No issues at all. They still work great! Injector prices have gone up significantly and it looks like it will be $40-$50 per injector if you buy them now. I bought mine at $100 for all for which made it significantly cheaper than any other options available at the time.

I think I bought take-offs on ebay the first time I did this. Mustang folks swap em out from time to time and I got a set of 8 that I split with a buddy.

Is it ok to remove rhe plastic ring from the injector tip?
https://cimg2.ibsrv.net/gimg/www.mia...fc91c43a9a.jpg

I have the same doubt, what did you do???

Thank you!!!

Yeah, you can cut them off

Oh man, thank you, life saver, they didn´t feel properly seated with the plastic tip on but I did´t want to remove the plastic tips without being sure as they cant be put back on.

So whats the best approach, pull them out with pliers or cut them with a small dremel?

Thank you again!!

I left the plastic ring on the tip in place. It made the lower seal a little snug, but it fit way better. I never tested it with the ring removed.

Nigel (FF) sells them with the ring removed. I would use pliers as I feel I have much more control over a dremel in such a delicate operation, but each to their own.