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Old 07-26-2023, 06:59 PM   #1
JoeAlcohol
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Join Date: Aug 2022
Chapter/Region: MAIC
Location: West Chester, PA
Vehicle:
1994 WRX STI
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Default 1994 WRX STi Version 1 fuel rail options

I have a 94 Sti with the EJ20G engine. I'm working on installing the Robtune with 550cc injectors and have been having trouble finding the best solution now. I've searched everything in these forums and found the options for EJ25D fuel rails as well as the adapter kits but the information on that is so old, I'm having trouble finding some things.

I found the below fuel rails for an EJ25D that look like they're side feed and would work but the site doesn't offer much information. Does anyone know if this Racetronix fuel rail be a good option for 550cc side feed injectors on an EJ20G? Anyone use one before?


https://www.racetronix.biz/p/fuel-ra...blk/fr-ej25-bk
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Old 07-27-2023, 08:19 PM   #2
AndrewsSubaru
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1992 Legacy Turbo
2 Saab 9-2x Aeros

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I used 2004 usdm sti injectors and they were fine, I think they would work well for your application. This was a very long time ago on my 1992 legacy, I don't think I needed to change my rails either
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Old 07-28-2023, 12:24 PM   #3
JoeAlcohol
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Thanks, Everything that I've read is that the USDM injectors won't fit the standard EJ20G injectors of any year. I did find the below link to an KSM Motorsports tested batch of 550cc injectors. I asked them to confirm that they'll work with an EJ20G fuel rail from 1994. Hoping they have an answer and I can install these without modifying anything else.

https://www.ebay.com/itm/144644021176
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Old 07-30-2023, 12:42 PM   #4
AndrewsSubaru
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If you want cheap go with your initial instinct and get 25d rails. Just make sure they come with the injector retainers because your current ones would not be interchangeable. I would check your local scrapyard so you can get the whole assembly and not second guess. At a glance those injectors look like they would work, ultimately it's up to you if you try these or swap the rail and use usdm

Last edited by AndrewsSubaru; 07-30-2023 at 12:44 PM. Reason: ebay link
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