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Old 04-23-2002, 12:09 PM   #1
MC Racing
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Unhappy 2.2 - 2.5 swap 97 impreza wagon A LITTLE HELP PLEASE.......

I am looking for information on swapping our old, and getting tired (130,000 mi and sounding even more like a tractor than usual every day) for a 2.5 .

I don't know the differences between the different 2.5's either, my thought was to maybe just swap in a 2.5 out of a legacy (sohc)? hoping that that would be the easiest.

Is the legacy motor any better?

What would I have to change? I did a search and could find only limited info.

From what I could see it looked like the trans was the same and I would use the 2.5 ECU and injectors. Is the harness the same?
Is the clutch the same? (I just put in a new clutch).

A RS motor would be great, but I think it may be out of my price range, whats the difference in HP ?

Basically I'm looking for a reliable, fairly simple swap upgrade with no check engine lights, oh and more torque.

Any info would be greatly appreciated.

Thanks, Mark
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Old 04-23-2002, 01:00 PM   #2
RaceCarRiot
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the RS and legacy 2.5L motors are the same engine.

try checking out www.fakewrx.com for info on the swap. not the most efficient method, but definitely the easiest.

-adam-
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Old 04-23-2002, 01:15 PM   #3
Hondakilla
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could go 2.2L Turbo but if it was me i would go 2.5L SOHC
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Old 04-23-2002, 02:45 PM   #4
MC Racing
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Thanks for the link Adam, but that was a 1.8 to 2.5 swap in an early car. It did have some usefull info in it though.

Anyone know about the 2.2 to 2.5 swap in a later (97) car ?
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Old 04-23-2002, 03:46 PM   #5
Hondakilla
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I know there are a couple of guys on here that have done a 2.2L turbo mod in their RS's and have great results...I'm sure that there are ppl that have had good results in their L's
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Old 04-23-2002, 04:39 PM   #6
MC Racing
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Thanks, but I really did'nt want to turbo it, I was just looking for the swap info (stock motor is already very tired).
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Old 04-23-2002, 05:22 PM   #7
RaceCarRiot
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yeah, but it shouldn't be that much different. just giving you a starting point, since no one swaps 2.5's into anything else once they're out. i would think the biggest issue would be the clutch assembly, but i think your car already has the newer hydraulic setup, no?

at least your 2.2 ECU has knock sensors so the thing won't be clattering like a sherman tank until it warms up.

-adam-
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Old 04-24-2002, 06:55 PM   #8
MC Racing
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Am I just stupid here or what? I thought this swap would be good bang for the buck, considering I have to pull the motor anyway... Is this a stupid idea? It seems no one has done this... Anyone else with Ideas or opinions on this?
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Old 04-05-2022, 05:58 PM   #9
Rubusberry
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Default 20 years later..

Did your 2.2 to 2.5 swap work?
I just picked up a '97 2.2 OBS needing a new engine. Wondering about the same swap

Cheers
Walter
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Old 04-05-2022, 07:19 PM   #10
benflynn
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We have a winner…
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Old 04-11-2022, 02:19 PM   #11
wtdash
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short answer: You'll want another EJ22 for that '97. The EJ25D in the '96-'99 LegGT/OB is a 99% direct swap. But unless it's a complete rebuild, don't touch.
Get another '96-'98 2.2 from any Subaru for a painless swap;'95 requires a dual-port exhaust manifold/EM.
You CAN use the earlier '90-'94 2.2 but you'd need to reuse your '97 Intake manifold/ IM and the same dual-port EM, and there may be some other gotchas.

These are all considered Phase 1/ P1 EJ-series engines and your ECU will run them all.

Note that some 2.2 had EGR and some did not.

And NO you can't use Phase 2/ P2 SOHC (2.2/2.5) engines from '99+. Harness/wiring/sensors/ECU are different.

Go search online or the https://www.ultimatesubaru.org/forum/ site; It covers this as good as any other site...and don't rely on FB, etc.
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Old 04-11-2022, 02:58 PM   #12
shagfagon
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Quote:
Originally Posted by Rubusberry View Post
Did your 2.2 to 2.5 swap work?
I just picked up a '97 2.2 OBS needing a new engine. Wondering about the same swap

Cheers
Walter
We have reached the point where its entirely plausible that the OP is straight up dead from old age. Hope to hear from him, but probably won't

Quote:
Originally Posted by benflynn View Post
We have a winner…
This HAS to be the oldest bump ever. 20 freakin years.
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