Ej255 Vs. Ej257?? - Page 2 - Subaru WRX Forum
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#16 Old 01-14-2009, 12:01 AM
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like i was saying i am no where near needing a stronger tranny at the moment
I was just curious. Just trying to learn a little more about Subaru and the setups.
If I could afford the STI i would have bought one though
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#17 Old 01-14-2009, 01:48 AM
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well, when the time comes you probably will want either another stocker (~200whp), upgrading to RA gears(~300whp), a PPG syncro'd helixial setup (~500whp), or a full out dog box (a lot).

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#18 Old 01-14-2009, 11:44 PM
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All right thanks for the info

Anything else I should know about the two engines and their differences?
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#19 Old 06-04-2009, 10:17 PM
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The blocks themselves are identical. The EJ257 and EJ255 share the same block castings, crank, and rods. The difference is 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. Trust me, I've built motors with both EJ255 and EJ257 blocks and heads and the shortblock is identical with the exception of the piston.

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#20 Old 06-05-2009, 08:18 PM
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Uh? 06rexwagon. Is the ej255 deck semi closed? Just wondering, because I was under the impression that only the 257 deck was semi-closed. Kinda surprised if they didn't slip in any forged parts as well, just like the 207 layout.
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#21 Old 06-05-2009, 08:24 PM
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yeah the 255 is semi-closed...its the exact same block as the 257 just slightly different internals and different heads

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#22 Old 06-05-2009, 09:42 PM
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My 2005 STi EJ257 that I'm building. Note the bracing from the block sides to the cylinder.


My 2006 EJ255 when I put forged pistons in it.


Same exact case, right down to the part #.

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#23 Old 06-05-2009, 11:11 PM
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Listen to this guy he knows his stuff^^^^. How's it going Cam?

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#24 Old 06-07-2009, 05:50 PM
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Quote:
Originally Posted by turmic View Post
If the same holds true from the EJ205 and EJ207 comparisons. Then I'd say that the EJ257 probably has some forged internals.
Ever since the version 8, neither of those engines have had forged internals. v7 did. They're hypereutectic (unless they've changed in the past year or so).

Also, I'm not sure the ports on the sti heads are any bigger...
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#25 Old 06-10-2009, 05:45 PM
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Good enough then. Its the N/A engines that are open deck. I was getting my info off 2.5rs.com or whatever.

WReXd: Thanks man. I don't know the versions well. So, thanks for clarifying stuff.
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#26 Old 02-02-2012, 03:30 PM
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Quote:
Originally Posted by WReXd View Post
Ever since the version 8, neither of those engines have had forged internals. v7 did. They're hypereutectic (unless they've changed in the past year or so).

Also, I'm not sure the ports on the sti heads are any bigger...
I know this is old, but this thread was one of the top 5 results on google. I'd like to set the record straight.

Both the ej255 and ej257 have hyper-cast pistons (hypereutectic). But... The rods are actually forged. Crawford actually claims that with just forged pistons, the ej255/7 can both handle up to 500whp.

The ej255 heads actually flow better but have a shallower dishing. The ej257 doesn't flow quite as well, but has deeper dishing and with the ej257 pistons dome... a lower compression ratio.
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#27 Old 02-02-2012, 07:46 PM
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Yeah, over the years I've learned a lot more and I put up some bad info up there. But, at lot of it was corrected. Thanks for information though Sinister.

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