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Old 11-26-2012, 04:22 PM   #26
sterling326
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Okay, i swapped over the sensors, I can't use the egr (it's been crimped and blocked off prior to me having it) As far as the sensors go, I ran the vacuum hoses the best i could. Some of them could not be ran like before because the 2.5 manifold had different openings. So I connected them the best I could. Could this mess things up?
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Old 11-26-2012, 06:09 PM   #27
Storm
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As long as you have vacuum where you should have vacuum and the vent line going back to the tank, it should run with no CEL.

Jay
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Old 11-26-2012, 08:45 PM   #28
sterling326
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I don't mind the CEL ( I am in an emission exempt town) but I want my car to run right. So as long as it's running right and not messed up, screw the CEL. Thanks for the help Jay!
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Old 11-27-2012, 04:55 PM   #29
Storm
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No problem. The only thing you're going to hate, is how fast the revlimiter comes up, compared to the EJ18!!!

If it were a 96 car, you could make a couple more changes and run a 98RS ECU too....



Jay
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Old 11-27-2012, 08:38 PM   #30
sterling326
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I heard you mention something about a legacy 2.5 ecu? jdm. Can i use that ecu to maybe get rid of that rev limit? At this point i'm waiting on these two little clips that hold my throw out bearing onto my tranny to arrive at the dealership so hopefully I can get this motor in by saturday.
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Old 11-27-2012, 08:39 PM   #31
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maybe it wasn't you, I heard it somewhere though.
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Old 11-28-2012, 06:31 PM   #32
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I might of said that actually the jdm harness might be a lil closer to the original 1.8 ecu.
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Old 11-28-2012, 08:09 PM   #33
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Yeah. I just now realized STORM mentioned the 98 ecu. I'm gonna try and locate one. So what would be involved with that? just repining the wires to plug into the 98 ecu?
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Old 11-28-2012, 08:38 PM   #34
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If your car doesn't currently have a knock sensor, you'll have to add a pin at the ECU for it, but aside from that, it's plug n play. (in a 96-98 chassis)

Jay
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Old 11-28-2012, 11:45 PM   #35
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so apparently i picked up a 1.8L manifold..

i dont quite follow what has to happen to make it work on my 2.5 Ej251..

it looks like it would bolt right up, but idk
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Old 11-29-2012, 04:42 PM   #36
sterling326
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Quote:
Originally Posted by Storm View Post
If your car doesn't currently have a knock sensor, you'll have to add a pin at the ECU for it, but aside from that, it's plug n play. (in a 96-98 chassis)

Jay
I think mine does. Located right on top of the engine above the crank pully.
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Old 12-02-2012, 05:04 AM   #37
sterling326
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First start attempt was a success! I'm officially rocking that ej25d now
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Old 05-14-2015, 03:49 PM   #38
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Hopefully I can get some help on a.similar topic I just swapped blocks between a 02 Impreza @nd 93 Impreza due to hydrolock the car seems like it wants to fire up but no dice just got a new starter and plugs I was thinking coil but I'm kinda limited on funds and kinda wanna narrow it down some more
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Old 05-14-2015, 04:29 PM   #39
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When you say blocks, did you swap shortblock or longblock?

Longblock you will need to rewire the car, shortblock should be fine. Are the cam and crank sensor plugged in?
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Old 05-15-2015, 04:35 PM   #40
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Make sure the crank sprocket on the 2.5 is the same as the one that was on your 1.8. If not swap them. There where some differences on AT's, MT's etc.
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Old 05-15-2015, 11:49 PM   #41
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Quote:
Originally Posted by John*G View Post
Make sure the crank sprocket on the 2.5 is the same as the one that was on your 1.8. If not swap them. There where some differences on AT's, MT's etc.
I was going to suggest this very thing. It's going to either have 6 teeth or a bunch of teeth on the crank sprocket.
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Old 10-17-2019, 04:31 PM   #42
Patrick Olsen
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Ancient thread bump! I've got a '96 Brighton 5-speed that I bought a couple years ago as a winter beater and which has become the daily driver (since my various other cars are non-running because it takes me forever to do anything). The '96 has a single-port EJ22 in it, installed by the previous owner; he said it came from a '96 Legacy Outback. It still has the EJ18 intake/TB/harness and stuff on it, but I have a complete EJ22 intake/TB/harness that I grabbed from a junkyard car, just haven't done anything with it yet (see previous comment about taking forever to do anything). The EJ22 in the car now has unknown mileage on it. It uses oil - not sure how much it's leaking (via the "typical" leaks) vs how much it might be burning - and it ticks, particularly when the oil starts getting low.

So, I've been thinking the engine needs to come out at the very least to be resealed (rear access cover, rear main, front main, oil pump, the standard stuff). But since I have no idea what mileage is on it, and it might need more work, I'm kinda thinking I might as well do an EJ25 swap. Early 2000s Outbacks & Foresters are pretty easy to find in the junkyard, so I should be able to score an EJ251/253 for a couple/few hundred bucks, then put the EJ18/22 IM and wiring on it, swap cam & crank triggers as necessary, and be good to go.

The other way to do this (as shown in this thread) is to use an EJ25D, but use the original EJ18 wiring, which basically all connects right up to the EJ25D. I can also find EJ25Ds in the junkyard pretty easily (there are pretty much always '96-99 Outbacks in the yards), but those are older (probably higher mileage) and who knows what condition the HGs would be in. With that in mind, if I bother to do this I'll probably stick with a SOHC EJ251/253.

Quote:
Originally Posted by Storm View Post
No problem. The only thing you're going to hate, is how fast the revlimiter comes up, compared to the EJ18!!!

If it were a 96 car, you could make a couple more changes and run a 98RS ECU too....
I have a '96, so I'm intrigued by this. I also have at least one '97-99 2.5GT ECU sitting around. Any idea if your 2.5RS ECU trick would also work with the 2.5GT ECU? They're both EJ25Ds, but I kind of vaguely recall that the pin-outs aren't quite the same between Impreza and Legacy. I just found the '98 2.5RS pin-outs on NorthUrsalia's site, I'll have to compare that to the 2.5GT pin-outs (which I have saved on my laptop at home).

Quote:
Originally Posted by Storm
If your car doesn't currently have a knock sensor, you'll have to add a pin at the ECU for it, but aside from that, it's plug n play. (in a 96-98 chassis)
So is that what you were referring to in the above quote about a "couple more changes"?

It would be more work, of course, but if I went the EJ25D route I could do a Phase 1/2 hybrid. I still have my old Cobb-ported EJ25D heads with TWE valvetrain bits. Unfortunately, the Cobb cams were sold off a while ago, and I'm not sure I want to spend money on new regrinds, so I'd probably just get some junkyard EJ25D cams and call it good. Those heads + a junkyard EJ251/253 short block + junkyard EJ25D intake manifold. Not sure the end result would be worth the time / effort compared to just doing a SOHC EJ25, but it's a thought.
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Old 12-03-2019, 03:26 PM   #43
Patrick Olsen
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Quote:
Originally Posted by Patrick Olsen View Post
Quote:
Originally Posted by Storm
No problem. The only thing you're going to hate, is how fast the revlimiter comes up, compared to the EJ18!!!

If it were a 96 car, you could make a couple more changes and run a 98RS ECU too....
I have a '96, so I'm intrigued by this. I also have at least one '97-99 2.5GT ECU sitting around. Any idea if your 2.5RS ECU trick would also work with the 2.5GT ECU? They're both EJ25Ds, but I kind of vaguely recall that the pin-outs aren't quite the same between Impreza and Legacy. I just found the '98 2.5RS pin-outs on NorthUrsalia's site, I'll have to compare that to the 2.5GT pin-outs (which I have saved on my laptop at home).
I finally got around to checking the pin-outs of the '98 2.5RS vs my '97 2.5GT; they are the same. So I just need Storm to come back to this thread and tell me what I need to do to use my EJ25D ECU.
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