04 STI injector swap

martimus919 · Post by **martimus919** » Mon Nov 16, 2009 11:44 pm

I found STI injectors off of an 04 does any one know the size they ran? Also they should just pop into N/A 2.2 rails correct?

macipusy · Post by **macipusy** » Mon Nov 16, 2009 11:46 pm

I believe they are 550cc if it's a USDM STi and they will fit into 92-94N/A rails.

555BCTurbo · Post by **555BCTurbo** » Tue Nov 17, 2009 4:34 am

They'll also fit in Turbo rails too

martimus919 · Post by **martimus919** » Tue Nov 17, 2009 5:31 pm

I've heard otherwise on the turbo rails, i guess the legacy sport injectors and rails are one of a kind from subaru.

martimus919 · Post by **martimus919** » Wed Nov 18, 2009 1:59 am

Would I be ok putting the STI injectors in before getting the Revtronix chip. What problems would I run into if I did this?

ericem · Post by **ericem** » Wed Nov 18, 2009 3:50 am

Extremely rich?

wtdash · Post by **wtdash** » Wed Nov 18, 2009 5:29 am

The '90-91 (Auto- @ least) rails are the same as the turbo rails - been there done that. The JDM 440cc (gray) and 480cc (yellow) both fit either. (Thanks to 555BCTurbo for that info.)

The USDM STi Yellow side-feeds fit the '92-94 NA, from what I've read on here and NASIOC.

When I ran the 480s on the way to get tuned for the Revtronix chip, it ran - but not well. Over 300 miles and the ECU never figured them out.

FWIW, there is someone on here that runs the 480s successfully w/the stock ECU, but most max it out w/the 440s.

So, the 550's would be 'iffy'.

asc_up · Post by **asc_up** » Wed Nov 18, 2009 6:16 am

The car wouldn't run with 550's. It would simply inject too much fuel and flood the engine.

macipusy · Post by **macipusy** » Tue Nov 24, 2009 4:37 am

Suprisingly my car ran and idled fine with the 550's and no tune. I did stay out of boost though.

Magnetrax · Post by **Magnetrax** » Sat Dec 12, 2009 4:24 am

what about running the vf39 w/top mount ic, sti yellows 550 and regulating the fuel pressure? could you dumb it down enough to make it work w/o aftermarket management

chochocho · Post by **chochocho** » Fri Dec 18, 2009 10:08 pm

to fit into the 92-94 n/a rails, did any of the seals/washers on the injector needed to be replaced?

thanks.

Post by **Legacy777** » Sun Dec 20, 2009 4:45 am

Nope nothing had to be replaced, the sti yellow 550's drop right into the 92-94 n/a rails.

RJ93SS · Post by **RJ93SS** » Mon Dec 21, 2009 12:55 am

mine will be here soon. they drop into the n/a rails, thats great

93legacylsleeper · Post by **93legacylsleeper** » Fri Jan 01, 2010 12:38 am

So wait Josh, you specified 92-94 N/A rails. What about a newer 2.2 liter like a 96 legacy? still the same rails? Are the 92-94 the only N/A rails that will work?

macipusy · Post by **macipusy** » Sun Jan 03, 2010 5:19 pm

I looked at the 98 2.2L rails next to 92-94 NA rails and they looked the same to me. I'm pretty sure they are the same as far as length and mounting points, but would have somebody doublecheck the injector fitment. I think the 98 2.2 injectors are the same shape as the STi's, but not 100% sure.

Adam West · Post by **Adam West** » Sun Jan 03, 2010 11:58 pm

Little off topic...

But what are folks paying for these? What's the going rate for 550's? Low and high. Need to get a set before going up to Revtronix this spring.

Thanks in advance for the info.

AW

93legacylsleeper · Post by **93legacylsleeper** » Mon Jan 04, 2010 12:04 am

I picked my N/A rails at the junk yard for $11.99 each. Just went and bought STI Yellow 550's for $120. Just had to patient and shop around.

Post by **Legacy777** » Mon Jan 04, 2010 3:43 am

Newer ones may work, but I can't say for 100% certain that they'll work. I do know the 92-94's work.

RJ93SS · Post by **RJ93SS** » Tue Jan 05, 2010 10:56 pm

Adam West wrote:Little off topic...

But what are folks paying for these? What's the going rate for 550's? Low and high. Need to get a set before going up to Revtronix this spring.

Thanks in advance for the info.

AW

just got mine shipped to van from nwic for 110 u.s. shipped

martimus919 · Post by **martimus919** » Sat Jan 09, 2010 8:32 am

I've got my yellow top STI side feeds already in my 93 N/A rails i picked up from the junk yard, just waiting for the chip now. The injectors dropped right into the N/A rails no problems. I'll try to put up some pics soon, i cleaned the rails in a ultrasonic cleaner so they look all pretty now.

cj91legss · Post by **cj91legss** » Sat Jan 09, 2010 4:16 pm

I bought my set of yellow 550s off a member here for 180 i think... On ebay they're going for 250-300+

As far as maybe an aftermarket fuel pressure regulator, Would that help with the 550s?

Florin1 · Post by **Florin1** » Tue Jan 26, 2010 1:12 am

i got td04, 06 IC, na rails w 550's and no chip/tune and my car runs fine. Not optimal, but fine...for now. (JECS is waiting on the shelf) waiting on the RTUP chip too...

brweber352 · Post by **brweber352** » Tue Jan 26, 2010 1:46 am

I got my injectors of Ebay for around $200. They were cleaned and flow tested but never installed, I guess the guy sold his car before he got to use them. BTW, they do not flow 550cc. I got a printout from witchhunter.com and after cleaning, 2 flowed 530cc,1 was 529cc, and 1 was 531cc. Yes, these are the yellow 550cc injectors off the STI everyone talks about, I'm running them in 92-94 N/A rails. I'm not saying they all flow 530cc, but mine sure as hell do.
These were tested at the standard of 43.5psi(3 Bar).

Post by **Legacy777** » Tue Jan 26, 2010 3:45 am

Mine were a little closer, but still weren't all at or above 550

http://main.experiencetherave.com/subar ... _calib.pdf

Adam West · Post by **Adam West** » Tue Jan 26, 2010 4:21 am

Interesting. My 440s flowed right on at 440cc. The flow bench is kinda cool if haven't seen one before.

Also I see a lot of 565's for sale. I take it they won't work in the rails.

Is there a chart that makes all the MY injector choices clear?

I've seen something for tranny's like this and would love to put my hands on something like it for stock injectors...

Wow, if it included rail types that would be great too.

Suppose that's a lot to ask tho.

Thanks in advance for the perspective and info.

AW

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04 STI injector swap

04 STI injector swap

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