Yellow STI injectors DO work

[guitaraholic]

Well, I put the yellow STI side feed injectors in my car, and it started right up and idled "okay" I could tell it was running a little rich, but it wasn't going to stall, I have yet to install the Z32 MAF or the ECU (both I have, doing that tomorrow, it got too dark). Just letting everyone know there is a nice low cost alternative out there. Hell, you can get them remained from autoparts giant for about $190 for a set of four.

Everything I have read tells me they are 550 high impedance. If anyone has any information that does not correspond to this please let me know. My ECU is chipped so I can tune it for the proper injector size.

[Z33dori]

nice find.......that good to hear

[Ninjabread]

Sweet.

High impedance means you need to wire in a resistor, right? Is that complicated at all?

[projekt_s13]

Are you talking about a sr or ka? Not that it would matter much but i would still like to know.

[babowc]

wasnt this known looooonnnnng time ago?
both KA and SR are high imp sidefeed.
which means, its a direct drop-in.
minus the plugs/clips.

[UNISA JECS]

I know they fit into our rails (KADE & SR) but the connector is slighty different did you have to change them to teh Sti connector?

[Ninjabread]

so you need the plugs too, and then just 2 wires?

[guitaraholic]

Sweet.

High impedance means you need to wire in a resistor, right? Is that complicated at all?



Actually its the other way around. If the injectors are LOW impedance and the ECU requires HIGH impedance, then yes you would require to use a resister to change the impendance of the injectors from LOW to HIGH, otherwise you will burn out the injector driver in the ECU (BAD!!!) because it would draw too much current, lower ohms equals higher current draw, like speakers (I believe). However, from what I have heard if the ECU uses low impedance, and you put in high,, you don't need to do anything.

However the ECU uses HIGH imp and the injectors are HIGH imp (from what I've heard). So you don't need to do anything

[guitaraholic]

Yes I had to change the plugs, that was pretty easy, I made quick disconnect pigtails, so I can change out the Sr20's 370's or the STI's 550's

BTW,, they don't have to be a STI plugs,, Legacy plugs will work too (that's what I used)

[babowc]

you just need the clips/plugs, whatever you want to call it.
and you splice it with STI clips.
hopefully you got it with the injectors.. if not, more than likely, autoparts store will have em.

there are two wires, and only two wires.
its really self explanatory after the drop-in. :)

[babowc]

Yes I had to change the plugs, that was pretty easy, I made quick disconnect pigtails, so I can change out the Sr20's 370's or the STI's 550's

thats actually a really good idea..
+1 for that,
never thought of that!!
:bigok:

[UNISA JECS]

Here is a picture of the plugs and injectors for the Sti injectors and im almost positive they are high impendence just like our injectors.

http://i167.photobucket.com/albums/u159/zilvia_album/injector.jpg

[guitaraholic]

Yeah,, that's pretty much them,, You can go to Autoparts Giant and pick up some remans for $165, or new Pythons for $190. Either way, its DIRT cheap for a nice injector upgrade. Look up part# 842-18132 (http://catalog.autopartsgiant.com/item.wws?sku=842-18132&mfr=GB%20REMANUFACTURING%20INC.&weight=1&cookieID=27J12O1Q727J12U25U&clientid=autopartsgiant)

[UNISA JECS]

http://i167.photobucket.com/albums/u159/zilvia_album/sti-injectors-1.jpg

[UNISA JECS]

The hardest part is gonna be finding the connectors for the Sti injectors as im sure there not easy to find separately

[guitaraholic]

The hardest part is gonna be finding the connectors for the Sti injectors as im sure there not easy to find separately

Actually, not too hard to find,, you can use a Subaru Legacy plugs. There are a lot more Legacies then STI's

[Ninjabread]

So basically, these are brand new 550, drop in (minus wiring) for 190$.

I'm sold.

[MURPHY]

send em some random ass injectors for cores too

[guitaraholic]

Yeah,, hell of a cheaper alternative. I've seen them used go for ~$100-$120 (that's what I got mine for), and remanned for $190-$200.

[UNISA JECS]

For $190 where, is that for a set? I know you can get them from Autozone for $99.99 an injector but $190 for a set is awesome

[UNISA JECS]

Double Post...msglnght

[guitaraholic]

It's $47/ injector, so that comes out to ~$190,

Go to Autoparts Giant, and look up 2004 Subaru Impreza STI Turbo 2.5 injectors

[Rittmeister]

I've been told they're 520cc, not 550, by a guy who has done quite a bit of Nissan tuning with them. Anything to that?

[ch1873857]

hmm just replaced boss' STI injectors with power enterprise 850s. i have to clip his old clips off and use the PE ones. anyone want them?

[UNISA JECS]

hmm just replaced boss' STI injectors with power enterprise 850s. i have to clip his old clips off and use the PE ones. anyone want them?


I do to bad you could send them with the turbo you already sent.

[guitaraholic]

I guess you could up the fuel pressure a few pounds and make them flow 550 without a prob,, I'm guessing running around 49psi instead off 43.6 should get you at 550cc.

[UNISA JECS]

I've been told they're 520cc, not 550, by a guy who has done quite a bit of Nissan tuning with them. Anything to that?

I was also going to mention that to, I've heard 520cc.

[ch1873857]

I guess you could up the fuel pressure a few pounds and make them flow 550 without a prob,, I'm guessing running around 49psi instead off 43.6 should get you at 550cc.

:kiss: someone knows what they're talking about.. i just like the sti's baller spray pattern

[Tenchuu]

anyone know off hand if they will toss into a RB25 also before i go do all the legwork to find it out?

[Antihero983]

if anyone needs any, i work at a dealership and can get them AT cost!

[D1GP]

if anyone needs any, i work at a dealership and can get them AT cost!

what is the at cost price?

are there any sidefeed from suby that has a higher cc by chance?

[guitaraholic]

Not sure, though I believe the subie injectors are popularly modified for $816cc. Though I'm not 100% on that one.

[bejota180sx]

how much could you get me the injectors and clips or plugs whatever people call them? send PM

or anyone who hast them used send a pm 2 im really in the lookout for these injectores for quite some time now...

[Neejay]

Thanks for the info man.

[bardabe]

anyone know off hand if they will toss into a RB25 also before i go do all the legwork to find it out?

high impedence side feed. go knock ureself out :wackit:

[Antihero983]

ok i got a pirce for a couple people on here...

unfortunately we cannot get the injector plugs w/out ordering the whole harness, as they do not come seperately.

theyre a little bit more that the Reman ones mentions earlier, but theyre also brand new...

will WRX plugs work? we dont have any STIs on the lot right now that i can compare, and none of the FSMs are of any help....

[statik]

will WRX plugs work? we dont have any STIs on the lot right now that i can compare, and none of the FSMs are of any help....

from the first page

BTW,, they don't have to be a STI plugs,, Legacy plugs will work too (that's what I used)

[Antihero983]

from the first page


i read that, but i wanted to know if WRX ones would work in addition to the legacy plugs.

[paNX2K&SE-R]

Well, I put the yellow STI side feed injectors in my car, and it started right up and idled "okay"

Yeah they work great, I've been using them in my SE-R for a while now.


I've been told they're 520cc, not 550, by a guy who has done quite a bit of Nissan tuning with them. Anything to that?

Yes Kent thats correct, Scarpula sent his to JWT and Clark confirmed [email protected]


BTW, Any side feed Subie connectors work on them so start scouring those bone yards :)

[bejota180sx]

can i run them withought a tune? or will they make me run way to rich? i ask cause i found these injectors with the plugs for a great price and wanted to know if i should wait till i can get a tune or if i can run them with the stock ecu and walbro pump withought ruining something? wouldnt i be to rich and damage something?

[guitaraholic]

Don't quote me on the "no damage" from without a tune, but I believe your car would run REALLY rich. W/O the tune, your car is thinking it has 370's not 520's, so it would dump ~50% more fuel than it thinks it is. It would foul your plugs, make your car run like crap, and I bet your mileage would be like 7mpg (just pulled that number out of my a$$). I know my car was able to turn over/idle with the new injectors in, but I didn't try driving with them until I put the tuned ECU in.

I guess you could run a ASFC as a bandaid, Hope that helps.

[bejota180sx]

yeah thats what i thought just cheking... not really fond of SAFC but how would you setup the SAFC to read the sti injectors if nobody knows if the are 520 or 550s everyone gets a friggin different number from theyre flow checks and things like that...

[guitaraholic]

Well, I have been running my STI injectors for about 2 weeks now, car has been running very good so far, awesome idle, and plenty of fuel for 17psi of boost (not on purpose, wastegate actuator is stuck..fixing soon). I am going to get the car dyno tuned and check the AFR's shortly, but as I stated before, even if I find out they are 520cc's, I'll just raise the fuel pressure to 49psi, and that will bring them up to 550cc

[40daws]

What year Leagcy and STI's will these injectors work from ?
Edit: Never mind. I found them.

[guitaraholic]

You talking about the plugs or the injectors? The plugs will work with "most" the legacies (red injectors), and 03-06 STI's (yellow injectors, not 100% sure on the year). As for the injectors, its just the 03-06 injectors (again, not sure on the years),, they are yellow, sidefeed, high impedance.

[bejota180sx]

i think yellow was o4-o5 but not sure about that i found them on a 05 sti

[welddrft]

I picked up some 04 STI injectors 3 months ago along with clips from a Impreza. Im about to test them out with the Z32 maf and a tuned ecu here soon to see if everything is good to go. If so I might sell the set or seperate. I also have an extra set of 4 plugs with plent of wire if anybody needs em. PM me if interested.

[bejota180sx]

remember to look for a USDM sti not a JDM sti for what ive read jdm sti have other injectors in theyre other engine...

[blownmotor]

WRX ijectors are top feed 04-06 USDM sti are side I bought mine's from a buddy for 100 dolllars only thing i had to do was take it off the manifold myself also legacy gt will work i believe its 05 and on they are rated at 525cc @ 43psi lag time is 0.79msec close enough to run on stock ecu

[bejota180sx]

what do you mean that close enought to run with stock ecu?

[blownmotor]

the injector lag time

[bejota180sx]

how come some people rate them 525cc while when they flow test them people get from 520cc up to sometimes 550cc? is there a reason why people get different things?

[chibich]

I have had an sti for about 3 years now, and just picked up a 240, and the stock injectors are 550cc, and most of the upgraded injectors for the sti required new clips. if you go on nasioc.com or iwsti.com and post up, I am sure there are a bunch of people out there with them. sadly I don't have mine any more otherwise I would offer them up. jdm sti injectors and wrx injectors will not work because they are a top feed design, where as the sti's are a side fed. If people are interested a company named perrin can also modify the sti injectors so that they will flow up to 816cc.

[chibich]

if anyone has any more questions about sti injectors let me know. haha. never thought I would see this on a 240 forum, but some of the guys do use nismo injectors and modified clips for their sti.

[slideways2004]

if anyone has any more questions about sti injectors let me know. haha. never thought I would see this on a 240 forum, but some of the guys do use nismo injectors and modified clips for their sti.

haha. that's funny. i like that. different people using parts off different manufactures and having great success

[importdude]

so has it been confirmed its peakhold or saterateD?

[guitaraholic]

Well, I believe most Saturated injectors are low impedance, where Peak and Hold are high impedance. Both the Sr20's injectors and STI's are high impedance. So I believe they are both Peak and Hold. So far they have worked for me just fine. Though I've read the opposite from other sites (low/peak and hold and high/saturated)

[dirtdiggler666]

not sure if i posted this but old toyota supra clips will work