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Old 05-31-2003, 08:00 PM   #1
Streetman
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Default '97 1.8 to '99 2.5; Wiring, Ecu, MAF?

OK, I've dug a little deeper, and I'm seeing some responses that suggested the 1.8 and 2.5 use the same wiring, MAF and even ECU. Now, I think that's crazy, but don't know. Could this be true? Could I actually drop in a 2.5, and bolt things right up? I know it drops right into the bay, and bolts up to the tranny no problem, but what about the rest? Will it work?

If that's the case, I'm all over a 1999 2.5.

If you're going to tell me to do a search, tell me what to search for. I've looked under 1.8, MAF, and Brighton. Seems not many have gone from the 1.8.

Someone, anyone, please direct me to a source that would know.
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Old 05-31-2003, 08:26 PM   #2
Streetman
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While I'm thinking about it, would it be possible to swap a 00 or 01 engine in, and just change the MAF to MAP, and drop in the new ECU. Seems it would work. Any other sensors different?
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Old 06-01-2003, 01:12 AM   #3
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You actually have an EJ18 in your '97? I thought they phased those out in '96. Anyhow, the proposed direct swap is from the EJ22 to the DOHC EJ25. If you go with anything newer than the DOHC EJ25, then it will require rewiring. I do not know the extent of this wiring since I have not compared wiring diagrams between the two. I think there are a few people that have actually run the EJ25 with their EJ18 ecu.

Possibly try searching for EJ25, EJ22, EJ18... and wiring together. I know there are quite a few threads but I can't think of exactly what you could search for to find them.

-Jon
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Old 06-01-2003, 01:16 PM   #4
Streetman
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Yeah, it's the 1.8. Everyone seems to be surprised to find a 1.8 in a 97 with AWD. No biggie, it's just a Brighton, not the L. Apperently, no one, even here, knows what a Brighton is. It's got NOTHING, except grey interior and the same headlights as the 99-01 RS. Just what I needed.

I don't think I want a DOHC 2.5. Seems I've had this discussion before, and I decided against it. However, I might, if it would just drop in.

I guess the real question is, what 2.5 can I just drop in?
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Old 06-01-2003, 01:27 PM   #5
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They definitely don't use the same ECU. It's possible that the wiring harness and sensors are almost all the same between a 1997 EJ18 and a 1999 EJ25, but maybe a 1997 EJ25's electronics would match up closer, though it is DOHC.

It would be possible to do all the wiring changes to incorporate the ECU from a donor EJ25; it might just be really hard.

You might be better off swapping whatever EJ25 you find in but keeping all your current sensors and ECU and then hacking it with an S-AFC or something.
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Old 06-02-2003, 02:14 PM   #6
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Murray, has swapped a 1997 2.2l to a 1999 SOHC 2.5l. This had a few issues with wiring and idle control. He ran it off the 2.2 ECU at least for a while.
The DOHC swap to 2.2l is supposed to be simple, but I have not read of anyone who did it. I am not too sure if the 1.8l = 2.2l harness.
Wac, ran a 1997 2.2l with 1999 legacy DOHC ECU, so it does plug in and work.
The trouble is to find a cheap, good 2.5 DOHC and ECU. You are basically looking for a Legacy engine as there were few RSs in 1998.
If I every trip across a one for a few hundred, I might consider. Wouldn't want to pay much more as the power is not huge and the headgasket could die anytime.
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Old 06-02-2003, 05:06 PM   #7
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OK, c'mon now, someone has to know this. There HAS to be one done, SOMEWHERE. No?

'97 1.8L with MAF and OBDII to '99 2.5L with MAF and OBDII....

Will it just drop right it? I don't have anyone with a 99 here to compare it to, I don't think. Got a 98 or 00, no 99.
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Old 06-02-2003, 05:14 PM   #8
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How about you look at the wiring diagrams and pinouts. That would give you a start.

-Jon
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Old 06-02-2003, 05:33 PM   #9
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Where might i find those?
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Old 06-02-2003, 05:51 PM   #10
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Here.

For the 1.8L, you may have to your local Subaru dealership and have them make a photocopy of the pinouts. To get more detailed then that will require you to come up with the FSM's and inspect sensor parameters and full wiring diagrams.

-Jon
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Old 06-02-2003, 11:21 PM   #11
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One more little tidbit. The 97 2.2l does not have EGR. Does the 1.8l? The SOHC 2.5l does have it. There is one potential difference.
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Old 06-05-2003, 11:49 AM   #12
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From the information I have, the ECUs between the 1999 EJ25 and 1997 EJ18 are completely different; you'd have to do quite a bit of adapting:

http://www.graphics.cornell.edu/~v/pics/97_99/
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Old 06-05-2003, 01:57 PM   #13
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Thanks for the info.

I'm thinking I was right all along. Just go with the WRX 2.0 engine, as any swap is going to be some serious work.
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Old 06-09-2003, 10:50 PM   #14
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Arg! I have done the swap. I have removed a 1.8l from my 95 OBDI L and installed a SOHC 2.5l from a 2001 (OBDII) car.

It depends... It will run perfectly fine off the 1.8 ECU, it will run rich though. if you want it act 100% like a 2.5 RS then change the harness and ECU Etc.

I did it cause my 1.8l had so many oil leaks i was sick of chasing down and wanted more power.

2.5 bolts right into the mounts and trans, i used a stock 2.5l flywheel clutch and pressure plate althoug the 1.8s will work.

Due to the idle air control setup and connections to the ECU, the 1.8 throttle body was retained. a blockoff plate was made to cover the idle air port on the newer 2.5 manifold.

the new style fuel injector connectors were spliced onto the 1.8 harness becuase i used the newer style injectors on the 01' 2.5.

crank and cam sensors, engne temp sensor, and oil press switch all plugged right in to the 1.8 wiring.

the temp gauge sensor was rewired, the older 1.8 had a small sensor with 1 wire whereas the newer 2,5 had a newer 3 wire sensor, i changed the connector to the newer sensor, blocked off two of the pins and ran the bottom wire to the temp guage.

I used the 1.8 coil pack and had plug wires made. if using a DOHC 2.5 stock 2.5 wires should work. I needed old style connectors on the coil end and newer style on the plug end. GOt them custom made and overnighted for 50 bucks from kingsborne wire werks.

EGR did not exist on the 2.5 so i hooked the harness to the solinoids which i retained and just plugged them off.

Knock sensor is not used

stock 1.8 intake and MAF sensor are used.

the only thing i can say to watch out for is the crank trigger on the timing sprocket that triggers the crank sensor.

the older cars it was all the same one, but for the newer (i think 2000 and up) there is a different ring on the manual trans cars. So if you want to use the 1.8 ECU you need to switch it over to the other timing spocket, or reuse the 1.8s

thats all i can think of.
Ive got over 7,000 miles on the 2.5 with the 1.8 ECU. I drive it hard too. it does run alittle too rich, occasionally when going WOT it bogs slightly cause when the ECU switches modes is over fuels, after a week i was used to this and learned to drive at 99% throttle and it does great, no problems. it will bog when really cold out for the same reason unless you let it warm up. if you start and drive it when cold it bogs if you get on it, if you let it warm up for a few min. it runs like normal.

Gas mileage on the 2.5 with the 1.8 ECU is around 26-28 MPG and i hit WOT at least 3 times every time i drive it.

Some vacuum lines will need to be rerouted, just sit down with a service manual and match them up. they will match up, just takes some time. My local dealer photocopied the pages i neededform the service manual for me. I am really happy with the results, it only cost me about 200 bucks because I already had the engine.

if you have all the parts ready to go and everything all planned it it should take a weekend max. to do. good luck, any questions PM me or email me at HAWK296@AOL.com
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Old 06-09-2003, 11:15 PM   #15
Streetman
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I really appreciate all that. I'll have to reread it a few times to absorb it all. However...

I've got 97, with OBDII. And yes, I'm NOT mistaken. Everyone keeps asking me that, why?

97
1.8
MAF
OBDII

When I heard the ECU could actually be used, I got to thinkin; everything might plug right up. Then again, I don't know. I'll be heading to a meet tomorrow, there might be one RS left there (everyone has moved on to the WRX). I'll see if we can match things up visually, to know for sure.

Got any thoughts on the OBDII 1.8?
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Old 06-10-2003, 02:35 PM   #16
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If you are OBDII it may be even easier. pretty much everything should plug in. get a copy of the engine wiring diagrams for 99 and for the 97'1.8. also for all the vacuum lines. It should be pretty straightforward and simple. As far as check engine lights and such, im not sure what will happen with the OBDII ECU. Im guessing youll be alright. 99 was a MAF car so i dont believe youll have that problem with the crank trigger, I think only the MAP cars were different. just make sure it had the 6 tooth trigger ring.
Ill bet you have it done in a weekend once you get all the parts laid out and ready. Goodluck.
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Old 06-10-2003, 10:11 PM   #17
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so, i have a sohc 2.2, so can i get a sohc or dohc 2.5, and put it in my OBS, and would it be plug and play, as long as i have the ecu for that motor, or what.

Jiffy

Last edited by SubaruWRC; 06-10-2003 at 10:21 PM.
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Old 06-11-2003, 01:45 AM   #18
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you can run a 2.5 off your 2.2 ECU. it will pretty much plug in although some modifications will be required depending on whether its DOHC or SOHC and what year it is. It you want to run it off the 2.5 ECU then you will have to do some harness splicing.
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Old 06-13-2003, 09:44 PM   #19
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my 97 obs has egr, and is obd2
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Old 06-13-2003, 11:41 PM   #20
Streetman
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Quote:
Originally posted by nomadtw
my 97 obs has egr, and is obd2
Do you have the 1.8 Liter?
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Old 06-14-2003, 07:04 AM   #21
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Quote:
Originally posted by nomadtw
my 97 obs has egr, and is obd2

His is a 2.2 btw.

Jiffy
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Old 06-14-2003, 08:52 PM   #22
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Quote:
I don't think I want a DOHC 2.5. Seems I've had this discussion before, and I decided against it. However, I might, if it would just drop in.

I guess the real question is, what 2.5 can I just drop in?

I had to change my response after re-reading your post...

Only the DOHC 2.5L uses the same ECU connectors as your '97 1.8L. If you must have SOHC, you're stuck with most if not all the mods that HAWK296 has so kindly listed for you.

The '99 SOHC is very similar to the '00 SOHC with the exception of a few sensors (e.g. MAF/MAP).

If you really want the '99 SOHC Impreza engine (the '99 Legacy 2.5L was still DOHC), you will have quite a lot of work to do with the wire harness.

-WaC
Wayne

Last edited by wac; 06-14-2003 at 09:12 PM.
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Old 06-14-2003, 09:13 PM   #23
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Quote:
my 97 obs has egr, and is obd2
Then it must be a 4EAT (auto).
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Old 06-14-2003, 09:57 PM   #24
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Wayne,

I just thought that might be the closest match because OBDII to OBDII, and MAF to MAF. Guess not.

What would you recommend dropping in here then? Just the DOHC? I suppose I could do that, if the price was right. Not what I wanted, but hey, I'm looking to do this cheap.

If it gets too expensive, I can source 2.0 engines left and right now for $2000. That's the other route, and may even happen after I get bored with 165 HP. Who knows.

Right now, I'm looking simple, one weekend, drop in, and plug it together. What's my best bet?

97
1.8
MAF
OBDII

and, yes it's a 97 with a 1.8! sheesh. Oh yeah, 4 wheel drive and grey interior too. I swear, this must be the only one made like this in 1997.
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Old 06-14-2003, 10:03 PM   #25
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There were lots of MY97s awd with 1.8l. In Canuckistan they were called Brighton's. Stipped interior, no power anything, no a/c, no stereo, vinyl/cloth seat faces.
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