Fuel Injector question for '03 WRX
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This is a discussion on Fuel Injector question for '03 WRX within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; These will be my mods when done- Catless uppipe Hi-flo catted downpipe with 3" tail section Upgraded TMIC Silicone turbo ...

  1. #1
    Registered User DirtModJunkie's Avatar
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    Fuel Injector question for '03 WRX

    These will be my mods when done-

    Catless uppipe

    Hi-flo catted downpipe with 3" tail section

    Upgraded TMIC

    Silicone turbo inlet pipe

    SPT intake(installed)

    Accessport(installed)

    1.Is there a noticable difference between 550 cc and 565cc?
    1a.What is the difference between "Cobb Spec" 565cc and non-Cobb Spec?

    2.Can the stock fuel pump handle 550cc-565cc injectors with the stock turbo and these upgrades?
    I'm not going bigger turbo until I can afford quality.
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  3. #2
    zax
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    Quote Originally Posted by DirtModJunkie View Post
    1.Is there a noticable difference between 550 cc and 565cc?
    1a.What is the difference between "Cobb Spec" 565cc and non-Cobb Spec?
    If you're referring to WRX "blues" vs. STi "pinks," you won't see much difference in flow rate. Either will work fine for your application. Cobb-spec has colloquially been used to describe injectors that have similar voltage-IPW and latency curves to stock injectors. It just means there is less to tune after install. However, IMO, even the stock tune on the stock injectors left a bit to be desired with regards to the latency.

    Quote Originally Posted by DirtModJunkie View Post
    2.Can the stock fuel pump handle 550cc-565cc injectors with the stock turbo and these upgrades?
    I'm not going bigger turbo until I can afford quality.
    To be safe, I'd recommend upgrading your fuel pump first. The stock EJ205 fuel pump is a 130lph unit. The early 2.5L variants received 145lph units while later variants received 155lph+ units. From a standpoint of engineering: there is likely a reason Subaru chose to up the flow of the fuel pump when installing 565cc injectors. If the IPW gets too short and the fuel pump flow rate is not matched, you'll have a fuel pressure drop in the rails. This could spell doom for the motor. When compared to the cost of injectors, conventional fuel pumps are quite cheap ($90 for a Walbro + install kit). I'd recommend spending the money up front.
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    Registered User DirtModJunkie's Avatar
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    I was prepared to spend on the pump.
    Not neccesary to go larger than 255lph with my planned upgrades then?

    edit-Did some reading, it'll be quite sufficient

    Thanks to all who help us out
    Last edited by DirtModJunkie; 03-17-2014 at 06:23 PM.
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    zax
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    Quote Originally Posted by DirtModJunkie View Post
    I was prepared to spend on the pump.
    Not neccesary to go larger than 255lph with my planned upgrades then?

    edit-Did some reading, it'll be quite sufficient

    Thanks to all who help us out
    Yeah not any issue whatsoever. The 255lph will handle over 400whp.
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    UnBanned Sinister's Avatar
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    The 255lph will handle 450whp on E85 (35% more fuel demand than gasoline). (at least it did on mine!)

    Stock EJ205 injectors are 440cc. The 565's will be a marked difference over stock.

    The 06+ WRX injectors (565ccs) do flow a little more than the STI Pinks (550ccs). You CANNOT use blues in an AccessPort or other OTS map specifically designed for the pinks, and vice versa. The injector scaling is approximately 2.5% different. That's not a lot, but it is definitely something!
    Last edited by Sinister; 03-18-2014 at 08:37 PM.
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    You CANNOT use pinks in an AccessPort or other OTS map specifically designed for the pinks, and vice versa.
    I purchased the AP upgrade V3 and went to site to refresh myself on which maps they have archived.
    Stage 2 maps for the 2003 wrx specifically list the pinks as a mod & as 565cc .

    Would the '06 wrx injectors fit mine or are they sidefeed? I will research by the time you probably reply.

    Gonna enjoy the stock turbo pushed to her potential for a year or so, then likely the Blouch 05/16gxt or 05/18g
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    Do you plan on a turbo upgrade?

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    UnBanned Sinister's Avatar
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    Quote Originally Posted by DirtModJunkie View Post
    I purchased the AP upgrade V3 and went to site to refresh myself on which maps they have archived.
    Stage 2 maps for the 2003 wrx specifically list the pinks as a mod & as 565cc .

    Would the '06 wrx injectors fit mine or are they sidefeed? I will research by the time you probably reply.

    Gonna enjoy the stock turbo pushed to her potential for a year or so, then likely the Blouch 05/16gxt or 05/18g
    All the data I've seen has the pinks at between 520 and 550cc's. The blues all around 565cc's. The cobb spec injectors are within their tolerances for their maps. Basically they cost more because to guarantee their flow is within their limits of their map. A CYA option that some people find to be worthwhile if running a cobb ots map for an upgraded turbo and injectors.

    06+ Blues are all top feed. Don't have to deal with the yellow sidefeed bs.
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    Quote Originally Posted by Sinister View Post
    The 255lph will handle 450whp on E85 (35% more fuel demand than gasoline). (at least it did on mine!)

    Stock EJ205 injectors are 440cc. The 565's will be a marked difference over stock.

    The 06+ WRX injectors (565ccs) do flow a little more than the STI Pinks (550ccs). You CANNOT use blues in an AccessPort or other OTS map specifically designed for the pinks, and vice versa. The injector scaling is approximately 2.5% different. That's not a lot, but it is definitely something!
    FIFY
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    Zax's utterly unimaginably stock 2015 STi build thread
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    Thanks Zachary!
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