Looking at a 2012 sti or wrx......need help with the difference - Page 2
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This is a discussion on Looking at a 2012 sti or wrx......need help with the difference within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; EJ257 vs EJ255 facts with pictures - NASIOC Try this. I know the post is from 2008 but it should ...

  1. #16
    Registered User junkyard08's Avatar
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    EJ257 vs EJ255 facts with pictures - NASIOC

    Try this. I know the post is from 2008 but it should still be relevant.

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  3. #17
    Registered User 386WRX's Avatar
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    After googling it, yes I found plenty of threads on this, the pistons are different, as well as the heads. Both are good for 350 hp, but I wouldn't be worried about the block on the wrx. Which is the same as the STI, btw. There is talk of a different hot side on the turbo too.
    Transmissions are different, as you know I hope.
    Wrx 5 speed, sti 6 speed.
    4 piston brembos in front, 2 in rear.
    Differentials are beefier in the STI too

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    Last edited by 386WRX; 04-18-2014 at 08:44 AM.

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    ok, so I have piston part #'s for a 2012 STI and WRX.

    STI-12006AC390 (A)
    STI-12006AC400 (B)
    WRX-12006AD210 (A)
    WRX-12006AD220 (B)

    STI has higher dome for higher compression on piston and there are 2 version for each..A and B stamped on the pistons. My buddy is the parts manager at Subaru and gave me all the info. also said larger IC and also said higher compression on the STI that's why the larger IC.

  5. #19
    Registered User D's WRX's Avatar
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    Different turbo also, VF52 (WRX) vs VF48 (STi)...although seem to be rating at the same HP

    Subaru Turbo List - NASIOC

  6. #20
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    I think going from an Evo to a 2012 WRX or even STi would leave you very disappointed
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  7. #21
    zax
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    Quote Originally Posted by 11GSR View Post
    ya, all I could find is the differences from the "older" models.

    So the known differences/similarities are....(if any of the gurus who know about this car can help out. still no clear answers on internals, exhaust, intake....) thanks!!

    1. STI has a larger IC
    2.Both have the same vf52 turbo
    3.STI has upgraded brakes/suspension/wing...yadayadayada
    4.
    5.
    6.
    7.
    8.
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    10.
    2. Is not correct. VF52 looks to be similar to the VF48 in the STi, but with different packaging. IHI does not publish compressor maps.

    EJ257 after 2008 has cam phasing on both the intake and exhaust. EJ257 in 2007 adopted nitride treatment on the crank, which was not added to the EJ255 crank until late 2009.

    Head volume is slightly different. EJ257 has different quench volume leading to a lower CR.
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    ok, so the compression is lower by .2 on the STI vs the WRX plus the STI gets 14.7 lbs of boost opposed to the WRX at 14.2.

    wrx has 1 cam phaser intake only, and the STI has 2 cam phasers intake and exhaust.

    After reading about all these ringland issues and my buddy telling me that every subbie that comes in fails the oil consumption test....it was 1 qt for every 3000 miles, now its 6 ounces for every 3000 miles, but he said every wrx/sti fails the test. he said keep the evo. I just had the bottom end built and love the evo. just looking at my options....and that is to probably stay with the evo. I like the looks of the sti, but damn...don't want to drop money into something that should be solid

  9. #23
    Registered User 386WRX's Avatar
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    Was hoping zax would pop in..he has all the complicated jargon.
    I just know that I like to go fast.
    And I would trade up to an evo if I had the funds.

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  10. #24
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    Quote Originally Posted by 11GSR View Post
    After reading about all these ringland issues and my buddy telling me that every subbie that comes in fails the oil consumption test....it was 1 qt for every 3000 miles, now its 6 ounces for every 3000 miles, but he said every wrx/sti fails the test. he said keep the evo. I just had the bottom end built and love the evo. just looking at my options....and that is to probably stay with the evo. I like the looks of the sti, but damn...don't want to drop money into something that should be solid
    I would suggest that you stay with the Evo unless considering a newer generation (2015) of STi. Even then, I would suggest to stick with the Evo until the FA20 makes its way into the STi. A few considerations:

    1. The Evo X GSR is much more a precision instrument than the GR STi. If you've driven an Evo, you'll find that a GR WRX/STi feels like a box of wet rags. That's not to say that the car isn't fast, just the precise feel isn't there. If the Evo X is a scalpal, the GR STI is a mace. This should be addressed in the new generation, which has been greatly enhanced.
    2. There have been ringland and ring issues with the EJ257, though it's a complete exaggeration to suggest that all STis fail. From the data, it seems that the failure right is above 2%, which is 2% higher than it should be. I'd also suggest that more than 2% of all STi owners modify their cars, which tends to add another dimension to the statistic.
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  11. #25
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    why are you trading the evo ? And both the newer wrx/sti have nearly the same baseline whp. wrx is underrated from the factory

  12. #26
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    Quote Originally Posted by 13WrXx View Post
    why are you trading the evo ? And both the newer wrx/sti have nearly the same baseline whp. wrx is underrated from the factory
    That is not correct. Please clarify by saying the 2009-2014 WRX has similar baseline WHP to the 2009-2014 WRX STi.
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  13. #27
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    Boomm right off cobbs dyno database. So yes it is correct.

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    The curves on the sti baseline look like ass

  15. #29
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    Honestly, it all just depends on what you want to do with the car. Build plans, drag strip, autoX, etc. Because IMO that is the deal breaker between the newer generation wrx/sti's(2009-2014). If you want 500hp and like to launch your car and take it to the track, then the sti is the car for you. If you want a DD that is still fast and fun to drive without trying to hit the 400+whp mark, then the wrx is the ideal of the two. The sti's platform is easier to make power with, mainly because of the 6-speed transmission being able to handle much more power than the wrx's transmission.

    Here are the facts(just like everyone else has said):
    -sti has the vf48 turbo, wrx has the vf52
    -sti has 6 speed tranny that can handle much more power than the wrx
    -sti has bigger brembo brakes
    -sti has dccd and si drive mode
    -sti has bigger and better intercooler
    -sti has a little nicer interior tidbits

    Now none of that is dismissing the fact that the newer wrx's are great cars. I have had 3 wrx's, and loved every single one. The choice is up to you. But if you want to even come close to the performance of your evo, you will want the sti.
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  16. #30
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    Quote Originally Posted by zax View Post
    That is not correct. Please clarify by saying the 2009-2014 WRX has similar baseline WHP to the 2009-2014 WRX STi.
    My bad man forgot about the 2015s lol

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