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Old 09-24-2011, 05:34 PM   #1
Wolfenstein
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Default ej22e to ej25d

Hey guys I picked up a 97 impreza with an EJ22e (sohc), and have an EJ25d (dohc) from a 97 legacy. I would like to put the EJ25d in it and would like to get some information about a few things.

1. can I use the 97 EH22e harness and ECU?

2. If yes to 1 is there any sensor changes or splicing that needs done?

3. If the Harness will work could I just swap the ECU?

This will be a complete engine swap not just heads. I do have the opportunity to get the ECU and harness from the legacy but if its not necessary I would like to know up front before I waist the time and money.

Thanks Again for any help or info
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Old 09-24-2011, 06:58 PM   #2
69subaru360
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Wrong section.

But the wiring just plugs in and it will run on the existing ecu ok.

You need to get the dual port header from the legacy.
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Old 09-24-2011, 07:05 PM   #3
Wolfenstein
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So it is. Sorry about that. Moderators please move.

I have a turbo manifold, UP, and DP from my Forester XT that I plan on using.

I'm sure it will run better with the correct ECU can I plug the Legacy ECU into my harness?
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Old 09-24-2011, 08:14 PM   #4
eg33GC
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the 25d will run fine on the 22e ecu
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Old 10-02-2011, 09:49 AM   #5
subieguy87
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Quote:
Originally Posted by Wolfenstein

I have a turbo manifold, UP, and DP from my Forester XT that I plan on using
those are useless w/o the turbo,ic& cross member
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Old 10-02-2011, 11:03 AM   #6
Wolfenstein
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I have all the stock parts from a 35R set up I did on my other impreza and the up, dp, turbo and ic from things I have upgraded on the Forester XT. I plan on modifying the stock 97 cross member to make room for the up pipe.
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Old 10-02-2011, 12:43 PM   #7
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Quote:
Originally Posted by eg33GC View Post
the 25d will run fine on the 22e ecu
is this fact? so when my 22e dies I can just drop in the 25d without doing any wiring whatsoever? and everything will work properly and smoothly?
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Old 10-09-2011, 09:41 AM   #8
subieguy87
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Quote:
Originally Posted by Wolfenstein
I plan on modifying the stock 97 cross member to make room for the up pipe.
Then buy a stock turbo x member... Like from a turbo legacy... Like I have for my 98
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Old 10-19-2011, 12:24 PM   #9
iluvdrt
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Quote:
Originally Posted by Wolfenstein View Post
So it is. Sorry about that. Moderators please move.

I have a turbo manifold, UP, and DP from my Forester XT that I plan on using.

I'm sure it will run better with the correct ECU can I plug the Legacy ECU into my harness?
DO NOT boost the EJ25D. It will break. It uses smaller rod journals then other EJ engines and is weak. Dont believe me? Do a search.

Quote:
Originally Posted by Frogg View Post
is this fact? so when my 22e dies I can just drop in the 25d without doing any wiring whatsoever? and everything will work properly and smoothly?
Yes, the engine is a direct swap. You need to change nothing except the header. I have done it several times.
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Old 10-19-2011, 12:53 PM   #10
Wolfenstein
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This I know. I guess its a good thing I have a newer phase 2 sti crank, sti rods and pistons sitting around.($50 invested BTW) Before you get all worked up about the crank my father in law has a machine shop. So machining a number 5 thrust will cost me a big fat 0! So all said and done including machine work I will have about $350 in this complete engine. This is for a rally cross car I'm looking to spend as little as I can and have as much fun as possible. So far including cost of the car, the ej25d, full 5 speed swap and a RS hood I have about $1500 invested plus crap I had sitting around collecting dust.

Last edited by Wolfenstein; 10-19-2011 at 12:58 PM.
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Old 10-19-2011, 01:12 PM   #11
Wolfenstein
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Here is a guy that did a somewhat similar build. Now I'm not looking to run 20+ psi more like 7ish, but interesting none the less.

http://www.rs25.com/forums/f7/t39629-boosted-ej25d.html
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