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Old 03-25-2008, 10:28 PM   #1
boomer3
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Default EJ25 engines!?

Hi everybody, i cant find any info/stickies on differences in subaru engines. I have a 97 legacy gt, ej25d. I dont know the differences between 'phase 1', and phase 2', what years they were made.. are there electrical changes.. so on. Any stickies on the differences between subaru motors or ej25's specifically would be great. thanks!
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Old 03-26-2008, 12:01 AM   #2
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if I remember right the phase 1 was the twin cam(dohc) which was made from 95-99 in the legacy gts the phase 2 was the single (sohc) which was put in the legacy gt from 00-03

hears where its gets a little crazy if the motor has ever been changed with a rs motor then there is a chance you could have a sohc motor in a dohc car becaus the rs got the sohc in 99

the differences as I understand it are the dohc had more hp and a hightr red line but the sohc had more ft lbs and a slightly lower red line
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Old 03-26-2008, 02:13 AM   #3
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The EJ25D is the DOHC EJ25 which was used in the 2.5GT and Legacy Outback from '97-99, and in the 2.5RS and Forester in '98. The EJ25D is commonly referred to as the "Phase 1" EJ25. (There was also a DOHC EJ25 in the 2.5GT and Outback in '96, but it was not the same engine. I'm not sure what its designation is.)

The SOHC EJ25 has been used in all the Subarus since '99 or '00. I think we're up to the EJ253 now, but I could be wrong. The SOHC EJ25s are the "Phase 2" engines. The EJ251 to EJ253 are all variations on the same thing, just adding new features and tweaks along the way. I think if you go searching online at www.subaruparts.com or one of those sorts of sites you'll find that the Phase 2 shortblock has remained the same from '99 to at least '05.

The engine wiring harnesses and associated plugs are not the same on the DOHC and SOHC engines, so you can't put a SOHC engine into a DOHC car (or vice versa) and just plug 'n' play.

The ECU plugs are vastly different, so you can't put a DOHC ECU into a SOHC car (or vice versa) unless you completely re-do the harness.

Pat Olsen

Last edited by Patrick Olsen; 03-29-2008 at 01:15 AM. Reason: Changed EJ255 to EJ253
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Old 03-26-2008, 11:31 AM   #4
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The 2.2 also came in a phase 2 didn't it?
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Old 03-26-2008, 03:11 PM   #5
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Quote:
Originally Posted by 99BD5 View Post
The 2.2 also came in a phase 2 didn't it?
Sort of.
The EJ22 has always been a single overhead cam (SOHC) motor (I *think*) although power was increased somewhat on the '97+ Legacys (and '96+ Imprezas) when the compression ratio was increased and the motor became an interferance motor. I don't think there have been any major changes to the short block of the EJ22 motors over the years, although the EJ22T (early '90ies Legacy Turbo motor) is very different (having a closed deck design).

Subaru dropped the EJ22 2.2 liter motor in the US starting in 2000.
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Old 03-26-2008, 03:21 PM   #6
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Quote:
Originally Posted by tecnica technician View Post
The differences as I understand it are the DOHC had more hp and a higher red line but the SOHC had more ft lbs (torque) and a slightly lower red line.
Actually both the Phase I DOHC EJ25 ('97-'99 USDM Legacys) and the Phase II SOHC EJ25 (2000-2004 USDM Legacys) produced the exact same 165 BHP rated horsepower, however the Phase II motors produced this same power at a much lower RPM ranges giving a wider power band. With the increase in low-RPM horsepower and torque, there is no need to make use of the upper band RPM ranges with the SOHC design.
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Old 03-27-2008, 07:29 PM   #7
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Quote:
Originally Posted by Patrick Olsen View Post
The EJ25D is the DOHC EJ25 which was used in the 2.5GT and Legacy Outback from '97-99, and in the 2.5RS and Forester in '98. The EJ25D is commonly referred to as the "Phase 1" EJ25. (There was also a DOHC EJ25 in the 2.5GT and Outback in '96, but it was not the same engine. I'm not sure what its designation is.)

The SOHC EJ25 has been used in all the Subarus since '99 or '00. I think we're up to the EJ255 now, but I could be wrong. The SOHC EJ25s are the "Phase 2" engines. The EJ251 to EJ255 are all variations on the same thing, just adding new features and tweaks along the way. I think if you go searching online at www.subaruparts.com or one of those sorts of sites you'll find that the Phase 2 shortblock has remained the same from '99 to at least '05.

The engine wiring harnesses and associated plugs are not the same on the DOHC and SOHC engines, so you can't put a SOHC engine into a DOHC car (or vice versa) and just plug 'n' play.

The ECU plugs are vastly different, so you can't put a DOHC ECU into a SOHC car (or vice versa) unless you completely re-do the harness.

Pat Olsen
The major difference between the 1996 Phase I and 1997-1999 Phase I engines was headgasket (non-metallic used in 1996), and compression ratio.

You are incorrect about the 1999 RS, it had the Phase II engine (I've been hanging out on 2.5RS too much it seems!).

The Phase II engines had two different phases, the EJ252 and EJ253. Getting too complicated now... Basically, the 253 has higher compression than the 252.
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Old 03-27-2008, 08:36 PM   #8
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Quote:
Originally Posted by Jonathan View Post
Sort of.
The EJ22 has always been a single overhead cam (SOHC) motor (I *think*) although power was increased somewhat on the '97+ Legacys (and '96+ Imprezas) when the compression ratio was increased and the motor became an interferance motor. I don't think there have been any major changes to the short block of the EJ22 motors over the years, although the EJ22T (early '90ies Legacy Turbo motor) is very different (having a closed deck design).

Subaru dropped the EJ22 2.2 liter motor in the US starting in 2000.
Actually, not quite.

The PhaseII EJ22 was 99-01, but only '99 for the Legacy, the Impreza L kept it till 01 and then the bugeye came out, and the RS was the base model Impreza. It featured an even higher CR than the previous EJ22s and 142HP and 149 TQ over the previous 137HP and 143TQ on the 97-98 EJ22 which was still phase I.
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Old 03-29-2008, 01:15 AM   #9
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Quote:
Originally Posted by Chi_San View Post
You are incorrect about the 1999 RS, it had the Phase II engine (I've been hanging out on 2.5RS too much it seems!).
What part of...
Quote:
Originally Posted by Patrick Olsen
... and in the 2.5RS and Forester in '98.
... says anything about the 2.5RS not having the Phase 2 engine starting in '99? If we want to get really into the weeds, we could talk about how some of the '98 2.5RSs (and probably Foresters) and '99 2.5GTs (and probably Outbacks) had the "hybrid" engines with Phase 1 DOHC heads on Phase 2 blocks.

Quote:
Originally Posted by Chi_San View Post
The Phase II engines had two different phases, the EJ252 and EJ253. Getting too complicated now... Basically, the 253 has higher compression than the 252.
And there was also the EJ251 in there. I think the EJ251 was maybe the '99 version that still used MAF, and then the 252 and 253 were MAP? I don't know. I was wrong about the numbering continuing on to EJ255 - I don't know if we've ever seen an EJ254, and the EJ255 is the turbo DOHC motor, not a N/A SOHC motor.

Pat
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Old 03-29-2008, 02:06 AM   #10
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I think your wording was confusing. And didn't the 1998 have the DOHC, with the 1999 getting SOHC? I'm not clear on that particular changeover, even from the RS forums.

There wasn't an EJ254, just EJ25D, EJ251, 252, and 253, then the turbo EJ255 and EJ257.
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Old 03-29-2008, 05:44 PM   #11
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So what about the EJ25E?

Someone who knows more than I do should update the Wikipedia article:
http://en.wikipedia.org/wiki/Subaru_EJ_engine#EJ25
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Old 03-29-2008, 08:13 PM   #12
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EJ25E would be an EJ252 it looks like.
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Old 03-30-2008, 12:56 PM   #13
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Quote:
Originally Posted by Chi_San View Post
EJ25E would be an EJ252 it looks like.
Didn't Subaru at some point (2005?) add some form of V-Tec like variable valve timing increasing the rated horsepower from 165 BHP to 173 BHP ?

Does this motor have a unique designation ?
Is it in anyway related to the semi-closed deck 2.5 Liter turbo ?
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Old 03-30-2008, 01:07 PM   #14
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Quote:
Originally Posted by Jonathan View Post
Sort of.
The EJ22 has always been a single overhead cam (SOHC) motor (I *think*) although power was increased somewhat on the '97+ Legacys (and '96+ Imprezas) when the compression ratio was increased and the motor became an interferance motor. I don't think there have been any major changes to the short block of the EJ22 motors over the years, although the EJ22T (early '90ies Legacy Turbo motor) is very different (having a closed deck design).

Subaru dropped the EJ22 2.2 liter motor in the US starting in 2000.
Quote:
Originally Posted by Wiscon_Mark View Post
Actually, not quite.

The Phase II EJ22 was produced 99-01, but only '99 for the Legacy, the Impreza L kept it till '01 and then the bugeye came out, and the RS was the base model Impreza. It featured an even higher CR than the previous EJ22s and 142HP and 149 TQ over the previous 137HP and 143TQ on the 97-98 EJ22 which was still phase I.
Thanks. I had forgotten about the base model Imprezas keeping this motor.

If I am not mistaken the "Impreza RS" was in fact the sportier version of the base model Impreza (basically a WRX with out the Turbo) and the actual base model was the "Impreza TS" which featured 15" steel wheels with plastic simulated WRX style wheel covers. Is this correct ?
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Old 03-30-2008, 01:41 PM   #15
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Quote:
Originally Posted by Jonathan View Post
If I am not mistaken the "Impreza RS" was in fact the sportier version of the base model Impreza (basically a WRX with out the Turbo) and the actual base model was the "Impreza TS" which featured 15" steel wheels with plastic simulated WRX style wheel covers. Is this correct ?
For 2002-2004, TS was the wagon, RS was the sedan.
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Old 07-07-2008, 04:49 PM   #16
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hey guys sorry to bring the thread from the dead, but i have 02 outback with early phase 2 EJ25 that is blown and i am trying to figure out will the later EJ25s 03-04 and 05-06 would fit. looking for na but would consider turbo if not too much hassle.

thanks
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Old 07-07-2008, 05:05 PM   #17
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Anything would physically fit, but the wiring might be a little different for the 05-06 engines. Somebody who knows more about the newer Legacy engine quirks can expand/correct on that statement.
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Old 07-07-2008, 06:20 PM   #18
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Is your stock engine MAF or MAP?
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Old 07-07-2008, 09:02 PM   #19
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Originally Posted by Chi_San View Post
Is your stock engine MAF or MAP?
i am not sure about that how do i find the difference?

the engine is out and i have box of other stuff so sensor should be there i will see if i can find out

cheers
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Old 07-07-2008, 11:54 PM   #20
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It's MAP, all BE/BHs in the US had the MAP sensor on the EJ25.
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