Jump to content
SAU Community

Subaru Injectors On Rb25

Don Dada

By Don Dada,
in Engines & Forced Induction

 Share

Recommended Posts

Don Dada Mentor

Don Dada

Posted
Posted

Ok guys after doing some research it seems like the Subaru side feed yellow top injectors can work on the 25det

Alot of Sr20 guys are doing the swap and says it fits as oem in the rail, are high imp,and just the connectors are different.

The problem is a little confusion over the USDM which claims their own is 550cc or thereabouts and the JDM spec which is 440cc for the same yellow tops

The JDM seem to have this on the EJ20 twin turbo out of the Legacy an the USDM out of the STI.

If this is true i can't believe there is no info on SAU to support this...... yes i've searched!!!

Anyone have any further info on this???? Sounds like a better option than the rx7 side feeds that need the collar to work.....and not to mention cheaper!!!

Link to comment
https://www.sau.com.au/forums/topic/297808-subaru-injectors-on-rb25/
Share on other sites
Don Dada Mentor

Don Dada

Posted
  • Author
Posted
imo - upgrade to either RX7's or the S15R 480's. More headroom for *futre boost bugs.

*future - edit

The Rx7 needs a collar to work and the connectors are different also.

S15 are verrrry hard to source here so its not an option.

I can confirm 90% that the Subaru yellow tops fit in the rb25/sr20 rails without modification and i know the USDM Ej25 STI has these said injectors just need to confirm if the JDM spec out of the Ej20 twin turbo Legacy are 440cc or 550cc for the same yellow tops.

Some part numbers for the two would be nice!!!

rob82 Mentor

rob82

Posted
Posted
The Rx7 needs a collar to work and the connectors are different also.

S15 are verrrry hard to source here so its not an option.

I can confirm 90% that the Subaru yellow tops fit in the rb25/sr20 rails without modification and i know the USDM Ej25 STI has these said injectors just need to confirm if the JDM spec out of the Ej20 twin turbo Legacy are 440cc or 550cc for the same yellow tops.

Some part numbers for the two would be nice!!!

The 02-03B4 TT run 440cc Injectors.

WizardBlack Rookie

WizardBlack

Posted
Posted
I assume this is JDM spec as only the JDM Legacy came TT right?

Does anyone have part nos. for the US spec Sti and the Jdm Legacy yellow top injectors so we can compare???

USDM STi injectors are multi-oriface and 550 cc./min. Likewise, it's very easy to max them out on the original car and they put up with 100% IDC without fluttering, so they're pretty darn tough. Many injectors won't deal with much past ~85%. I used to tune Scoobies and I pegged them on plenty of cars with no det.

CEF11E Veteran

CEF11E

Posted
Posted

they are good injectors, I tested them when looking at producing hiflows. they flow just like oem injectors and as mentioned apart from having to chop up your loom and wire in new plugs they fit. the reason no one often goes for a set of these is because they are expensive once you buy 2 sets even if you buy 3 sets and split them. you also have to source at least 2 sets of injectors.

this is the reason I went with hiflowing the standard units. cost and having to modify the loom.

  • 3 months later...
Don Dada Mentor

Don Dada

Posted
  • Author
Posted

Was looking into this again and realized that both the Ej20 single turbo and the Ej20 twin turbo have what looks to be the physically same yellow side feed injector.

So the question now is...... are the single turbo yellow and twin turbo yellow JDM injectors the same size???

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Rezz
      OEM Soko: Japanese business supplying Automotive items from Japan - Freebie inside!

      By Rezz · Posted

      We have some genuine Japanese legally decommissioned car number plates now in stock 🙂 Add some legitimately obtained JDM style to your Skyline or other Japanese model, or simply as a garage/man cave decoration! About the 40mm hole: The Ministry of Land, Infrastructure & Transport in Japan recognised the popularity of keeping decommissioned plates among car enthusiasts and came up with a method to "destroy" (or render them unusable for street use) while still retaining their collectable/usable value for display etc.  We have 40mm hole covers available to cover the hole nicely with a Sakura motif, which are also available in white in (very!) limited quantities, however they frequently sell out. Please let me know if you're wanting one or more of these and I'll check availability. The Sakura motif covers are more common. https://www.oemsoko.co.jp/products/genuine-decommissioned-japanese-vehicle-number-plate-set-su-7515 https://www.oemsoko.co.jp/products/genuine-decommissioned-japanese-vehicle-number-plate-set https://www.oemsoko.co.jp/products/genuine-japanese-vehicle-number-plate-400mm-hole-cover *Please note that we can't obtain particular number or area name (eg: "Gunma 500 Fu ・86") if requested. All plates are provided as they become available after decommissioning. 
    • MidnightR32
      RB20DET lean on cold start

      By MidnightR32 · Posted

      Ah, fair enough. For the IAT, I'm using a legit GM sensor that was used on the car prior to my current build. I'll get another wideband and IAT ordered and follow up when they show up. Thanks for the help.
    • GTSBoy
      RB20DET lean on cold start

      By GTSBoy · Posted

      You shouldn't need to massively fatten up the mixtures for cold conditions. For one thing - 0°C is not that cold. For another, the Haltech will be using the IAT sensor to tell it how dense the air air, and calculate the correct amount of fuelling. Then the cold start enrichment is added as a % on top of that, so it should scale with the main fuelling. You might also doubt the IAT sensor at this time. You're not using one from an RB26 are you? Using a nice Bosch sensor or similar? Happens. Some wideband units take great pleasure in killing their sensors. Put another wideband in the tailpipe and compare. Or just swap the sensor to a brand new one and see.
    • MidnightR32
      RB20DET lean on cold start

      By MidnightR32 · Posted

      Oh, my misunderstand. When the car was running, it sounded ok, but if I gave it any gas it wanted to die but caught itself afterwards. It's very different from how it was a couple months ago when it was warmer outside. The logs show that the AFRs are better during, what I assume, is warmup enrichment. Because it's cold, and air is more dense, should I work on the enrichment bit?
    • A31Skyline
      Rb20e and RB20DET parts

      By A31Skyline · Posted

      yess of course im not using 2nd hand parts from my spare engine, but the place where i live is hard to find parts for the RB20DET ,but for the RB20E is everywhere including new ones and a lot cheaper ,because for the RB20DET you have to order it overseas to get one and it cost a lot of money 3x the price to be exact. so i ask this topic because if i can use the new ones but for RB20E is it compatible or not. if not im screwed haha, not totally screwed but i have to save a lot of money first before i can begin repairing my engine, thanks for the information before.
×
×
  • Create New...