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Old 08-17-2008, 08:44 PM   #1
EastsideLegacy
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Default 95 2.2L Legacy to 98 2.5L DOHC

Can i swap a 98 2.5L DOHC legacy motor into my 95 2.2L Legacy without any major wiring ?

anyone done it before?....i have the ECU from the 98 and it is a OBDII 95.

Thanks for any response
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Old 08-17-2008, 08:50 PM   #2
69subaru360
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No wiring needed. It will just plug in and run on the ECU in the car. Everything will bolt up.

I do this swap in reverse a lot. I replace EJ25 DOHC's with 2.2's

Put a fresh set of head gaskets in the 2.5 if they are not the latest updated gaskets from Subaru.
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Old 08-17-2008, 09:41 PM   #3
EastsideLegacy
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thank you very much
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Old 08-17-2008, 11:35 PM   #4
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Every '95 ECU I'v seen has a different plug on it than the 96-98 ECU's. Maybe the OBDII version of the 95 got the same plug.....if so, it's a direct swap.

Jay
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Old 08-18-2008, 08:56 AM   #5
69subaru360
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Quote:
Originally Posted by Storm View Post
Every '95 ECU I'v seen has a different plug on it than the 96-98 ECU's. Maybe the OBDII version of the 95 got the same plug.....if so, it's a direct swap.

Jay
You really don't have to swap the ECU, it will run on the 2.2 ECU just fine.

But if you do, be sure the new engine has the same emissions package as the old one. The ones with enhanced/california emissions have some extra evap stuff and sensors in the gas tank.
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Old 08-23-2008, 12:26 PM   #6
EastsideLegacy
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Default differnt question

Is it possible to swap a 97 legacy gt tranny into a 95L legacy

...... the main part of the question is if the rear in the L will match up to the gear ratio of the GT.... PLEASE ANY INPUT will help because right now i have the motor out and would really like to know thank you everyone
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Old 08-23-2008, 12:30 PM   #7
Storm
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The 97LGT should be 4.11:1 final drive ratio. What is yours? Being an EJ22 car, it may be 3.90:1. If they don't match, pick up a 4.11:1 rear end from any number of Imprezas or Legacies that had them, and install both.

Jay Storm
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Old 08-24-2008, 12:55 AM   #8
EastsideLegacy
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Is there a way for me to tell if mine is 4:11 or 3:90 .... some kind of number or somthing on the rear end.....

Or if i was to just install the tranny would it just not work or would it just eventually fail sooner than later ?

Also got the motor in and it started pretty good just couldn' t hear if it fired on point too well because of the exhaust not being connected and all...but seems like direct swap on motor for sure so far ill update tomorrow when i bolt up exhaust and cooling system.

storm thankyoualot
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Old 08-24-2008, 12:51 PM   #9
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The easiest way I know is to mark the input flange and the axle area. Then count how many turns the flange makes to one axle rotation. 3.90:1 would put the flange at about 11 oclock before that 4th full turn. 4.11:1 would have the flange go past the 4th turn and to just about 1 oclock.

I don't keep the PN's onhand, so I can't tell by looking.....unless the cover is off. If the cover is off, the ratio will be stamped onto the ring gear.

Jay
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Old 09-06-2008, 11:23 PM   #10
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How could you use the same computer when swapping in a bigger engine? I am guessing the 2.5L has bigger injectors than the 2.2L. If that is the case, the 2.2L computer would be programed for the wrong size injectors and would run the car rich. It might run, but i bet it would be running rich with the wrong computer.
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Old 09-06-2008, 11:33 PM   #11
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Quote:
Originally Posted by EvenSteven View Post
How could you use the same computer when swapping in a bigger engine? I am guessing the 2.5L has bigger injectors than the 2.2L. If that is the case, the 2.2L computer would be programed for the wrong size injectors and would run the car rich. It might run, but i bet it would be running rich with the wrong computer.
Same injectors, they run fine. Maf reads airflow, displacement doesn't matter. I have tons of 2.5>2.2 swaps running around, they all run great with the ECU that was in the car. These aren't nearly as complex as a wrx.
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Old 09-07-2008, 01:14 AM   #12
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All the ECU does is take what info the sensors are sending and apply it's corrections to maintain target A/F ratios. The injectors are sized for the motors, so all else being equal, they tend to run just fine. I've run an EJ25D off an EJ18 ECU and injectors with no issues.

Many times people overthink the swap and get hung up on this sort of stuff.

Jay
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Old 09-21-2008, 08:26 PM   #13
GLCraigGT
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I am thinking about doing this engine swap in my 94 legacy. I know that the engine management from 94 to 95 is pretty much the same, but is there any stumbling blocks that I should be aware of?
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Old 09-22-2008, 03:09 PM   #14
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Quote:
Originally Posted by GLCraigGT View Post
I am thinking about doing this engine swap in my 94 legacy. I know that the engine management from 94 to 95 is pretty much the same, but is there any stumbling blocks that I should be aware of?
That is not a good assumption. The 94 Legacy is OBD I, the 95 is OBD-II.
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Old 09-22-2008, 03:17 PM   #15
69subaru360
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Quote:
Originally Posted by jey View Post
That is not a good assumption. The 94 Legacy is OBD I, the 95 is OBD-II.
96 was the first full year of obd2. There are some obd2 95's but not all of them. But the 94 and 95 legacy have a totally different engine and chassis harness. It's possible to do this, but you will be doing wiring. It's not a plug and play.
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Old 09-25-2008, 01:40 AM   #16
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If you want real easy, you could throw an EJ25 shortblock under your heads....add in some cams and a better header. (you already have dual port heads afterall)


But you would have to run premium gas, which kinda sucks, but I didnt mind too much.



~Josh~
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Old 09-25-2008, 01:49 AM   #17
69subaru360
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Quote:
Originally Posted by ballitch View Post
If you want real easy, you could throw an EJ25 shortblock under your heads....add in some cams and a better header. (you already have dual port heads afterall)


But you would have to run premium gas, which kinda sucks, but I didnt mind too much.



~Josh~
I have heard of this combination over on USMB. It's supposed to have high compression and make good bottom end power.
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Old 09-25-2008, 09:09 AM   #18
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My brother put together a frankenstien 2.5 short block with 2.2 heags and a 1.8 intake manifold. Compression came out to 13-1 using the sti head gaskets. He ran it for a year on premium gas of course. It lasted a lot longer than I thought it would. But in the end it made a spectacular show of destroying itself. It did make a lot of bottom end power but in the end it was unreliable.
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Old 11-27-2008, 05:09 PM   #19
EastsideLegacy
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So i tried to swap the ecus they plugged just didn't start.or should i say played.

So from what ive read the 95-96 have less gt HP and tq so maybe just maybe if i can get this ecu in i will produce a easy 10-15 hp and tq over my now old ass ecu.

http://img.photobucket.com/albums/v6...Picture001.jpg

Anyone know how to make it work.

oh yea storm u da man and ballitch i may try the HC build on account i have a extra shortblock.
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Old 11-29-2008, 07:45 PM   #20
EastsideLegacy
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bump nobody ?????

I have a 1995 legacy L and the ecu is from a 1997 GT legacy ANYONE ... please..AH
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Old 12-01-2008, 11:31 AM   #21
lomaxmotorsports
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I need some help also folks did this swap into my 95 obd2 legacy and now I cant get it running! started up when I first put it in pulled the motor to replace trany and now nothing! I am getting dash lights on with the key off! The only thing I can think of would be the main and/or fuel pump relay? any help? really miss my car need some help bad!!
thanks
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Old 12-01-2008, 11:33 AM   #22
69subaru360
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Quote:
Originally Posted by lomaxmotorsports View Post
I need some help also folks did this swap into my 95 obd2 legacy and now I cant get it running! started up when I first put it in pulled the motor to replace trany and now nothing! I am getting dash lights on with the key off! The only thing I can think of would be the main and/or fuel pump relay? any help? really miss my car need some help bad!!
thanks
That seems like a ground issue.
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Old 01-21-2009, 02:43 PM   #23
MyogiNightKid
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So I could take a 2.5 DOHC and switch it into my 98 Leggie L with no re-wiring needed?
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Old 01-25-2009, 07:23 PM   #24
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Quote:
Originally Posted by MyogiNightKid View Post
So I could take a 2.5 DOHC and switch it into my 98 Leggie L with no re-wiring needed?
I like to know too...
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Old 01-25-2009, 08:54 PM   #25
69subaru360
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Originally Posted by Reason01 View Post
I like to know too...
Yes you can.

No it's not really worth it. There isn't much difference in power.
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