Will STi injectors work?

ShaggyGT · Post by **ShaggyGT** » Tue May 03, 2005 12:34 pm

Ok, so I am fairly new to the forum. I just purchased a '91 Legacy Turbo sedan. I have been considering a few different paths for mods already, as I have done with every Subaru I have owned. I was considering injectors when the other day I thought about the USDM STi yellow top injectors. I have an '05 Legacy GT right now which has those injectors stock, and I am in the process of doing a large build on it so the stockers will be coming out. So would they work in the Legacy turbo or would I need to get a different type of fuel rail from another Suby? From what I have seen of possible upgraded injectors that could possibly work, it would seem the STi injectors would work perfect. What do you guys think?

-Matt

-K- · Post by **-K-** » Tue May 03, 2005 3:05 pm

They should fit with the 92-94 N/A rails. I have fit some nissmo 440cc injectors in those rails and they claim fitment on STi's.

azn2nr · Post by **azn2nr** » Tue May 03, 2005 5:46 pm

most side feed high flow subuaru injectors and nismo injectors will fit on 92-94 NA rails which subsequently fit on the turbo as well

ShaggyGT · Post by **ShaggyGT** » Tue May 03, 2005 6:27 pm

Awesome. So looks like I need to find some N/A rails for sale. I take it just about any N/A Subaru fuel rails for those years will work? Thanks for the replys.

-Matt

Post by **Legacy777** » Wed May 04, 2005 4:12 am

ShaggyGT wrote:Awesome. So looks like I need to find some N/A rails for sale. I take it just about any N/A Subaru fuel rails for those years will work? Thanks for the replys.

-Matt

You need 1992-1994 legacy n/a fuel rails. They must be between those years, and they must be from a legacy. MT/AT doesn't matter.

It's possible the 93-94 impreza might have the same injectors, but I have absolutely no way to confirm that.

BAC5.2 · Post by **BAC5.2** » Wed May 04, 2005 8:40 am

Josh - The EJ18 rails fit the usdm STi injectors, and I'm PRETTY sure that they fit on the EJ22T.

ShaggyGT · Post by **ShaggyGT** » Wed May 04, 2005 12:38 pm

Ok thanks!!! So am I better off checking out the closest U-Pick It yards or is there some place online I can locate them?

-Matt

BAC5.2 · Post by **BAC5.2** » Wed May 04, 2005 12:46 pm

Go to a pic-n-pull first. Rails are wicked cheap. You could probably get both rails for under 20 bucks no problem.

azn2nr · Post by **azn2nr** » Wed May 04, 2005 11:20 pm

the part numbers on the imprezza rails are off by one number. but from the looks of it they are the same.

i have 2 sets of rails, one from an imprezza and one from a leg na. ill be selling one shortly but they wont have the thing that holds the injector down. one of the sets is missing this part. im sure youll be able to get them at the delear for cheap

IronMonkeyL255 · Post by **IronMonkeyL255** » Wed May 04, 2005 11:33 pm

Hmm....... My brother has an n/a '94 legacy.........

I think he's going to be getting some LT rails once I get some STi injectors.

ShaggyGT · Post by **ShaggyGT** » Thu May 05, 2005 12:57 am

Let me know when you are ready to sell those rails. I will definitely take those off your hands.

-Matt

azn2nr · Post by **azn2nr** » Thu May 05, 2005 4:22 am

for sure. i could probaly let them go by the end of the week

THAWA · Post by **THAWA** » Thu May 05, 2005 4:58 am

Incase you didn't know, and I just found out not too long ago

. Sometime in the last 6 years FHI raised the fuel pressure from 36.3psi to 43.5psi. So if the injectors you are about to install are 440cc/min then that would actually be a downgrade of 3cc/min using the stock pressure. If they are 480cc/min then you're looking at 30cc/min more at the stock pressure.

azn2nr · Post by **azn2nr** » Thu May 05, 2005 5:11 am

wait what????

if the pressure is increaced than wouldnt it be even more fuel???

THAWA · Post by **THAWA** » Thu May 05, 2005 5:17 am

Yes. Reread what I posted. I think you may be confused.

azn2nr · Post by **azn2nr** » Thu May 05, 2005 5:23 am

oh, you mean if you put big injectors in the stock rails right???

the fpr's that are on the na rails are vac fed so they should be usable.

THAWA · Post by **THAWA** » Thu May 05, 2005 5:24 am

I think you may still be confused. All our Legacys have 36.3psi as the fuel pressure. Newer Subarus have 43.5psi as the fuel pressure.

azn2nr · Post by **azn2nr** » Thu May 05, 2005 5:27 am

yeah, so how is the 440cc injectors a downgrade.

douglas vincent · Post by **douglas vincent** » Thu May 05, 2005 5:34 am

I think he is saying that they are rated at 440 at 43 psi.

Just upgrade to a walbro fuel pump. I have and am running 40plus off boost and 3.5 bar on boost.

THAWA · Post by **THAWA** » Thu May 05, 2005 5:47 am

Right, 440cc/min at 43.5psi, which is 367cc/min at 36.3psi. Conversly, putting a 43.5psi FPR onto a Legacy would yeild 443cc/min

azn2nr · Post by **azn2nr** » Thu May 05, 2005 6:22 am

cool. good thing im gonn use the na fpr's.

THAWA · Post by **THAWA** » Thu May 05, 2005 6:26 am

You still aren't understanding what I'm saying. The Legacy FPR is 36.3psi, turbo or NA. Changing to one isn't going to do anyhting unless your stock one is knackered.

azn2nr · Post by **azn2nr** » Thu May 05, 2005 6:29 am

it will if i use the imprezza rail

oh and if this is so how do you explain jake runnin as rich as he did as he was using a ss fpr

THAWA · Post by **THAWA** » Thu May 05, 2005 6:33 am

What year impreza?

what injectors was jake using?

azn2nr · Post by **azn2nr** » Thu May 05, 2005 6:38 am

jake was using yellow 440's

the imprezza was problay 98 ish.

either way, its still a pretty easy fix

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Will STi injectors work?

Will STi injectors work?