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This is a discussion on Quicker Response Faster Car within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; If the EJ205 was bored to 2.2L, that's your answer right there. The extra displacement is less the reason for ...

  1. #16
    zax
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    If the EJ205 was bored to 2.2L, that's your answer right there. The extra displacement is less the reason for the torque on the 2.5L as the longer stroke. For example, a 2.1L stroker motor (EJ205 case and EJ25x crank) will produce a similar powerband as the 2.5L with quicker spool compared to the EJ205. Increasing the bore without addressing the stroke is good for an exceptionally high-revving motor, which is usually counterproductive to producing low-end torque. AVCS surely doesn't hurt torque output down-low, but a higher CR 2.5L hybrid will produce more torque (more cylinder scavenging) than an AVCS-equipped 2.5L EJ255/257 with similar modifications.
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  3. #17
    OMG WTF MainFrame's Avatar
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    There we go.. 2.6L stroker, STi cams, smooth off the edges on the combustion chambers (but try not to remove much material), port and polish, high compression pistons, OEM head gasket, ported exhaust manifold, 16g. Aim for 9.5-9.8:1 CR. Ditch the FMIC for a PW TMIC (FMIC isn't helping your cause at all).

    Get it tuned on e85.. it should have some grunt then!

  4. #18
    zax
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    Quote Originally Posted by MainFrame View Post
    There we go.. 2.6L stroker, STi cams, smooth off the edges on the combustion chambers (but try not to remove much material), port and polish, high compression pistons, OEM head gasket, ported exhaust manifold, 16g. Aim for 9.5-9.8:1 CR. Ditch the FMIC for a PW TMIC (FMIC isn't helping your cause at all).

    Get it tuned on e85.. it should have some grunt then!
    Holy piss that would have a ridiculous amount of torque....
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly unimaginably stock 2015 STi build thread
    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

    Zach | Moderator -- Mid-Atlantic States, Tech & Modifying & General Repairs
    Rollin' with the Bugeye Mafia #302 | N.E.R.D. Subject Zero
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