Ej205 or Ej207?
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This is a discussion on Ej205 or Ej207? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hello there New to the Club..Have a few questions though..I have an 03 WRX with a blown engine..Now should i ...

  1. #1
    Registered User
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    Jan 2013

    Question Ej205 or Ej207?

    Hello there New to the Club..Have a few questions though..I have an 03 WRX with a blown engine..Now should i replace the Engine with a Ej205? or should i go with the JDM engine and have an Ej207? I understand that i will need to install the AVCS wiring as well as a JDM wiring harness and ECU. However my quetion is. Is it worth it? and can it be done quicky? I will have 10 days to make the swap.. Where could i but either a JDM or USDM Long block? Is it worth it to swap and make a JDM engine? and if so..which version V7. V8. or V9?

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  3. #2
    Super Moderator (Actually a SuperSpy) SD_GR's Avatar
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    Jul 2002
    CA, US
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    Ej205 or Ej207?

    Search "hybrid build" or find a good used EJ205 locally. Simplest solution.
    The world breaks everyone and afterward many are strong in the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry. Ernest Hemingway, A Farewell to Arms, 1929
    WRX Info Links, Courtesy TheJ
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  4. #3
    Moderator Donkey's Avatar
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    You would have to retune the JDM motor to run on 93 octane. I would do a EJ205 2.1L stroker
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S

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  6. #4
            MainFrame's Avatar
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    Sep 2002
    Austin, TX
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    The ej207 is a better engine, but honestly I don't think it would be worth all the trouble of a JDM swap. . The JDM ECU will have trouble passing US OBDII tests for emissions and safety inspection.

    Depending on what you're wanting out of the car, I would opt for an ej257 shortblock with after market forged pistons, then have your existing heads refreshed, match the combustion chamber to the 2.5L heads, and install STi cams. That would be much less trouble than having to redo all the wiring and everything.

    10 days is not realistic though. . I would plan on it taking about 90 days. If it has to be done in 10 days then your only realistic option is to buy a used ej205 longblock, drop it in, and hope for the best.

    What was the initial cause of engine failure?

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