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Guest Message by DevFuse

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EJ25 Swap help needed

wiring ej25 ecu dohc sohc

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4 replies to this topic

#1 Ruby Sue

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Posted 07 June 2014 - 11:32 PM

Hey guys. So I'm planning on doing an ej swap into my ea wagon this summer, and although I was planning on using an ej22, I have easy access to two ej25s. One is a SOHC with an incomplete harness, don't know what it came out of or what year it is. The other is a DOHC sitting in a wrecked 97 legacy, complete. From what I understand, the SOHC is the more desirable of the two. So I'm wondering if i can use the wiring and ecu from the DOHC on the SOHC? Is there anything else I would have to swap to make it work? I've seen people ask similar questions, but couldn't find any answers for my situation, so any help is appreciated. Thanks.

#2 grossgary


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Posted 08 June 2014 - 12:53 AM

not worth it.


you can use the DOHC wiring if you bolt the DOHC heads to the SOHC block.  SOHC block, DOHC heads, intake, and wiring...but then you're loosing the advantage of the SOHC and might as well use the craptastic EJ25 DOHC in the first place.


i'd get the SOHC, the wiring harness shouldn't be that hard to come by.



if you were convinced of the EJ22 in the first place, i wouldn't deviate from that plan.  it's 100X better engine and neither are performance mongrel engines.  since EJ25's blow all the time, they are very easy to sell.  if for some strange reason you have "cheap EJ25's", then just sell them, use the cash to buy an EJ22, and pocket the remainder.  sell EJ25 for $500, buy EJ22 for $300...or in your area it would be sell EJ25 for $1,000 and buy EJ22 for $600.  better engine, make money...no brainer.


if you have TWO cheap EJ25's available - sell them both.

Edited by grossgary, 08 June 2014 - 12:54 AM.

#3 Jabbott126



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Posted 27 July 2014 - 04:56 PM

Why does everyone like the ej22 tho? It's pretty much the exact same motor but with less Hp isn't it?

#4 bratman18



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Posted 27 July 2014 - 05:35 PM

Why does everyone like the ej22 tho? It's pretty much the exact same motor but with less Hp isn't it?

But much more reliable. Doesn't have the same head gasket issues, and as a rule, holds up to anything you throw at it, much better than the ej25.

#5 Gloyale


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Posted 28 July 2014 - 10:51 AM

Why does everyone like the ej22 tho? It's pretty much the exact same motor but with less Hp isn't it?


Better cooling capacity, Non-interference (pre-97)


Also simpler head design.....smaller, lighter, fits in an EA81 engine bay.


You could easily use the Harness and ECU from the 97 DOHC to run a 95/96 EJ22 just need the EJ22 w/intake.

Also tagged with one or more of these keywords: wiring, ej25, ecu, dohc, sohc

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