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Old 10-18-2018, 03:19 PM   #1
kgozi
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Default Any EJ20X/EJ20Y 08+ STi out there?

Looking for an alternative swap for an 08 STI

Version 10 EJ207 is almost 10k where I live, Ive heard great things about the EJ20X power potential and reliability.

If there are others who have done this swap on a NEWER STI im curious if there was any major hold backs or issues.
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Old 10-18-2018, 03:55 PM   #2
subaru_gc8
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you're going to loose power over a 257
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Old 10-19-2018, 12:23 PM   #3
Homemade WRX
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Originally Posted by subaru_gc8 View Post
you're going to loose power over a 257
I'd disagree. I'd say it would lose torque but with the higher redline, it could be a fun and cheap alternative. Not to mention the pistons are supposedly forged crowns with cast skirts.

I have an EJ20X sitting in my garage that I'd been debating on selling. My brother picked it up, needing a replacement engine for his LGT but didn't ask me first


Quick rundown on them, from a few posts down: https://forums.nasioc.com/forums/sho....php?t=2466868
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Old 10-19-2018, 06:18 PM   #4
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Originally Posted by Homemade WRX View Post
I'd disagree. I'd say it would lose torque but with the higher redline, it could be a fun and cheap alternative. Not to mention the pistons are supposedly forged crowns with cast skirts.

I have an EJ20X sitting in my garage that I'd been debating on selling. My brother picked it up, needing a replacement engine for his LGT but didn't ask me first


Quick rundown on them, from a few posts down: https://forums.nasioc.com/forums/sho....php?t=2466868
maybe, but with higher compression, you will loose boost and therefore have less HP as well
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Old 10-20-2018, 01:06 AM   #5
Bolster
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maybe, but with higher compression, you will loose boost and therefore have less HP as well
I just finished a Version 9 Spec C EJ207 swap into my 2002. It is so different from the EJ257 STIs that I have driven. I think it is more fun and has a significantly wider powerband, but that is only going off the but dyno.

This motor is 8.0:1, so not any different than USDM as far as compression goes.

The community has figured out how to get tons of power from the 2.5 motors, and that cannot be ignored or discounted.
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Old 10-20-2018, 02:26 AM   #6
subaru_gc8
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I just finished a Version 9 Spec C EJ207 swap into my 2002. It is so different from the EJ257 STIs that I have driven. I think it is more fun and has a significantly wider powerband, but that is only going off the but dyno.

This motor is 8.0:1, so not any different than USDM as far as compression goes.

The community has figured out how to get tons of power from the 2.5 motors, and that cannot be ignored or discounted.
What are you talking About? He is asking about a ej20x or y which has 9.5 compression
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Old 10-20-2018, 09:59 AM   #7
Bolster
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What are you talking About? He is asking about a ej20x or y which has 9.5 compression
I missed that somehow.
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Old 10-23-2018, 06:14 PM   #8
Homemade WRX
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maybe, but with higher compression, you will loose boost and therefore have less HP as well
Well compression helps and hurts. It aids in spool up, but hurts with safety margin on octane limitation.

If you're running E85, this engine will have a field day (I've been in numerous 10:1+ builds running over 28 psi). Would probably still be plenty of fun on 93 octane and meth injection. Even 93 would be fun with the extra revs....but yeah, the 9.5:1 CR might cap boost. I'd suspect it would do fine with an increasing boost curve past peak timing.

But safe to say some loss would occur. Fuel economy should go up though
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