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Thread: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve)

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    SLi Supporter chuckthefuk's Avatar
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    USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve)

    Here's some info I found online while helping a friend build a hybrid motor. I will update this as I add to it...



    In North America Subaru introduced the 2006 WRX with a detuned STi 2.5ltr motor, smaller turbo and and bigger brakes 4/2 piston to accommodate the power increase.

    Also the 05+ Forester XT and 05+ Legacy 2.5GT also used the EJ255.

    EJ255 & EJ257 blocks are IDENTICAL!!!
    ---> That does not mean their internals are. the 257 has stronger internals.
    ---> Both are semi-closed deck.
    ---> The difference between the two are the piston dish and heads. The combination of the small chamber EJ255 head and shorter piston dome make the 8.4:1 CR. The EJ257 has a deeper head and taller dome, making 8.2:1.

    -Chuck

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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Chuck strikes again! What would we do without this guy.

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    SLi Supporter mike-tracy's Avatar
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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Quote Originally Posted by chuckthefuk
    Rumors that have not been cleared up..
    -The third number in EJ**_ is the turbo size...
    -Chuck
    Hadn't heard that one - I thought since all STI's had a 7 at the end (post EJ20K motors) - that's what it referred to.
    NOOB Classifieds Moderator
    Giggity
    Quote Originally Posted by ericem
    oh boy, thats bad for canada!
    -91 SS 5mt. Can't believe a 21 year old car could be so much fun.
    -96 L 4eat. This girl has been with me through the long haul.
    ?????

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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Quote Originally Posted by mike-tracy
    Quote Originally Posted by chuckthefuk
    Rumors that have not been cleared up..
    -The third number in EJ**_ is the turbo size...
    -Chuck
    Hadn't heard that one - I thought since all STI's had a 7 at the end (post EJ20K motors) - that's what it referred to.
    no. The GC F and G model WRXs also had EJ207s. And the Forester STI (SG, not SF) and S402 both have EJ255s.
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

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    "Proby" jamal's Avatar
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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Quote Originally Posted by chuckthefuk

    EJ255 & EJ257 blocks are IDENTICAL!!!
    ---> That does not mean their internals are. the 257 has stronger internals.

    -Chuck
    Pistons are exact same material and if you put two next to each other and it's nearly impossible to tell the difference. It's all the same cast junk that cracks if you look at it funny. I have a whole box of subaru pistons with broken off ringlands and I even see it happen on brand new, bone stock <3000 mile stis.

    You should also give some credit to the guy who made that spreadsheet: Jeff Spounagle

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    SLi nOOb omgshitsjrdn's Avatar
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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Noob question.. How much faster is a GT compared to an L, or LS? And what should I do to have a faster performance?
    1995 Subaru Legacy LS- SOLD
    1996 Subaru Legacy L

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    SLi nOOb omgshitsjrdn's Avatar
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    Re: USDM Turbo EJ20/EJ25 P/N (Block, rod, crank, head, valve

    Quote Originally Posted by chuckthefuk
    (Brighton/L/LS) 135 bhp (EJ22E) vs (GT/SUS/Outback/LSi) 165 bhp (EJ25D)

    EJ22E is a very reliable motor compared to the EJ25D
    Im selling my car for a Gt when i.go back.to Houston. . And don't know what to start with for gains
    1995 Subaru Legacy LS- SOLD
    1996 Subaru Legacy L

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