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Old 06-28-2005, 12:14 PM   #1
BAMA RS
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Default Injectors for DOHC

Will the injectors from a new STi (or any JDM STi) work with the DOHC motor? I have SR20DETs right now but am looking for something bigger. I see some 550cc yellow tops on ebay but am not sure if those are direct drop-in or not. Thanks.

Cameron
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Old 06-28-2005, 02:19 PM   #2
maxiav
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I think on a 98RS you should be able to fit Sti Pinks, but if you are not turbo or S/C just get some WRX injectors... I think those are 370ccs or something like that...
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Old 06-28-2005, 07:16 PM   #3
Andursun0013
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i remember someone saying the STi injector won't be a direct drop in for the 98 fuel rail. I have a set of 440cc yellow top STi injectors from an 2.0RA engine that are a direct drop in that I am currently using. I plan on buying tomei sr20 injectors when I upgrade
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Old 06-29-2005, 02:36 PM   #4
ThuotRDX
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can you post more info on the tomei injectors? right now i am using sr20det injectors.
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Old 06-29-2005, 07:12 PM   #5
Andursun0013
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If I had some I would, I'm not going to be needing them anytime soon so I haven't looked into finding them. The reason I know about them is the guy I bought my 440's from (dmross) is using them in his RA swap. He bought the 740 cc injectors and is having ZERO issues. He would have more info on them than I would. If your using SR injectors now, I don't see why it wouldn't just drop right in. Of course you should be able to use any injector designed for the SR20
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Old 06-29-2005, 10:40 PM   #6
Joncas2
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STI Injectors will not work with 98 DOHC. Two suggestions:

If you are doing a buildup and tossing the factory ECU, try http://www.outbackmotors.com/. They make some great, great pieces (fuel rails, adapters, plus injectors) for the 98 DOHC.

If you are keeping the ECU to use with a piggyback, or if your fueling requirements are not as aggressive, the 440cc yellow tops are a perfect fit.

I am using the yellow tops and I purchased them from www.racecompengineering.com. In my application, I am running a piggyback, 440cc primaries, and (2) 1600cc secondaries.
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Old 06-30-2005, 04:38 PM   #7
BAMA RS
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Thanks for all of the info. I'm buying some 440 cc yellow tops for my setup.

I like the fuel rails from outbackmotors.com. Are you using those in your setup Joncas?
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Old 07-01-2005, 05:58 PM   #8
Joncas2
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Quote:
Originally Posted by BAMA RS
Thanks for all of the info. I'm buying some 440 cc yellow tops for my setup.

I like the fuel rails from outbackmotors.com. Are you using those in your setup Joncas?
Unfortunately I cannot because I am using an Emanage. It only supports up to 50% larger than stock fuel flow on the primary injectors. The top feeds provided from Outback are not the right size for good injector control with my setup (idling would be tough). Great people there. I am using the AN adapters for my stock fuel rails though and I am very pleased. The 440's were the perfect size for me. I would use the others if I could. For now its not possible. We have OBDII testing here. If I can get a waiver then Outback rails and a standalone would be a great alternative. For now, I must pass emissions.

Good luck.
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Old 07-31-2005, 05:16 PM   #9
BAMA RS
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Default Update!

I finally got around to installing my yellow tops but they don't fit!? It looks like i'd have to drill the fuel rail to get them to fit. Has anyone else had this problem or do i have the wrong injectors? By the way, here is a horrible comparison pic.



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Old 08-01-2005, 08:10 AM   #10
Andursun0013
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What car are those from??? I have yellow tops from a Version 5 or 6 STi RA and they dropped right in my 98 RS Fuel Rails with NO modifications.

Kyle
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Old 08-01-2005, 05:01 PM   #11
BAMA RS
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I was told they are from a Ver. 5 STi RA. Did yours look just like those?
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Old 08-01-2005, 08:02 PM   #12
Andursun0013
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No, looked like the red tops for the most part - just had a yellow top
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Old 08-02-2005, 12:25 AM   #13
Joncas2
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My yellow tops (440's) also drop into the 98 fuel rail like a glove. No mods required. Me thinks you have been given some different/incorrect injectors. My yellows don't even look like the one in your picture.
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Old 08-02-2005, 10:38 AM   #14
WebWizard
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not trying to hijack your thread, but I have been looking for larger injectors for my 98 RS.. Anyone know a site that sells direct drop in?
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Old 08-03-2005, 05:56 AM   #15
ChicksDigWagons
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New Turbo Project...

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Quote:
Originally Posted by BAMA RS
I finally got around to installing my yellow tops but they don't fit!? It looks like i'd have to drill the fuel rail to get them to fit. Has anyone else had this problem or do i have the wrong injectors? By the way, here is a horrible comparison pic.




Those injectors look like they would fit in one of the earlier side-feed fuel rails. My Legacy Turbo injectors look exactly like the yellow tops you have except they are pink. I'm not sure what year they changed the style, but I do know the legacy turbo injectors did not fit my 97 EJ22 grey top fuel rail. I have a set of 1995 Legacy fuel rails/injectors I should check to see how they compare.
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Old 08-03-2005, 06:19 PM   #16
Joncas2
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Default

Quote:
Originally Posted by WebWizard
not trying to hijack your thread, but I have been looking for larger injectors for my 98 RS.. Anyone know a site that sells direct drop in?
I purchased my set 440's for my 98RS here: http://www.racecompengineering.com/product-eng_3.htm

RCE-0622 STi 440cc Ver.5/6 Side-feed Injector (fits MY98 RS also) -- $489/set

Not the least expensive I've seen but I take comfort in that I know they are new and I know they will fit. Great vendor. I love the injectors. I have some additional fuel tidbits from www.outbackmotorsports.com. Another great vendor.
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Old 08-10-2005, 10:32 AM   #17
CUNNINGHAM
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I haved used the SR20DET 370cc's and The 04/05 STI yellows in my stock 98RS rails with no problem. I have currently gone to the Perrin 816cc With STI fuel rails. Adapters will need to be made to fit rails Here is a pic.

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