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Old 08-17-2005, 10:29 AM   #1
impreza4show
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Subaru Stars 2.2L-2.5L na swap help needed ASAP!!!!!!

Hey guys. I'm not really new to nasioc but i'm new to this whole swap idea. I've been gathering information on this swap for like 2 months now. This is my situation..... I have a 1997 impreza L completly redone on the outside but the engine isn't quite as nice. I found a very good deal with practically trading my 2.2 for a 2.5 sohc from an '01 rs with alot less mileage. Now here is the problem, i'm aware of the fact that maf and map are different and i was told to make my maf sensor fit in my intake piping. Also the whole ecu deal. Does this need to be completely changed or does my 2.2L manage it ok? I'm very confused on what i need to do but very willing to get it occomplished. Any advice or information is greatly appreciated.
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Old 08-17-2005, 10:54 AM   #2
kaisersouse
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Quote:
Originally Posted by impreza4show
Hey guys. I'm not really new to nasioc but i'm new to this whole swap idea. I've been gathering information on this swap for like 2 months now. This is my situation..... I have a 1997 impreza L completly redone on the outside but the engine isn't quite as nice. I found a very good deal with practically trading my 2.2 for a 2.5 sohc from an '01 rs with alot less mileage. Now here is the problem, i'm aware of the fact that maf and map are different and i was told to make my maf sensor fit in my intake piping. Also the whole ecu deal. Does this need to be completely changed or does my 2.2L manage it ok? I'm very confused on what i need to do but very willing to get it occomplished. Any advice or information is greatly appreciated.
im no expert, but i would assume the ECU needs to come over too?
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Old 08-17-2005, 11:54 AM   #3
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The ecu and the metering system go hand in hand. You can't change one and leave the other. I would also assume that if you change the metering system, you're changing the wiring harness as well.. and I doubt you want to get into that.

You can find more info here:
http://forums.nasioc.com/forums/showthread.php?t=386462 (under the heading: "Is there documentation for an EJ25 swap?")

and here:
go to i-club.com and add this: 'forums/showthread.php?t=65143'
(we cannot post links directly to i-club on NASIOC)
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Old 08-17-2005, 12:45 PM   #4
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you can run a EJ25 on your Ej22 stock ECU and wiring. if your EJ25 was a 98 DOHC, the ecu and entire engine wiring harness would plug right in.

as it stands right now, pull the intake manifold off both engines, and transfer the EJ22 engine wiring harness to the EJ25. plut it in your car, and then fire it up.

wont run utterly perfect, but pretty damm good.

i ran a EJ25 DOHC with EJ18 ecu for 2 years. One of the first to do the swap
my friend did a EJ25 SOHC from a 01 on his EJ18 ECU, still running it right now (2 years +)
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Old 08-17-2005, 03:41 PM   #5
ballitch
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I have been told that it is preferable to use the EJ18 ECU, only because the EJ18 ecu's have better fuel/timing maps for higher rpms. but still the computers on our cars are really flexible if you think about it, running a 2.5 litre engine off of 1.8 litre engine management.....not to shabby in my opinion.



~Josh~
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Old 08-17-2005, 09:08 PM   #6
subbyspeed
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i've had mine for a few weeks now.. And its not bad.. I haven't had any issues with it detonating or anything like that.
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Old 08-17-2005, 09:50 PM   #7
impreza4show
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hey thanks for the help. If i keep my 2.2L ecu and run an apexi safc can't i program it differently? To run it better.
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Old 08-18-2005, 12:02 AM   #8
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you can use a variety of piggy back electronics to tune it. i had a Emanage on mine, piut down 117 awhp and 119 lb-ft on a dynopac. not worth the expense in my experiance (cost me $700 and gained me 4hp over stock).

id just leave it alone and swap to a EJ20 later.
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Old 08-18-2005, 09:39 AM   #9
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i'm doing the same swap in a week or two! i'm trading my wrx turbo and tmic(stock) and $700 for an '01 rs engine(66k) harness and ecu. it's too good to pass up. with everything i got what will i still need to complete this? help if you can! will this be a quick plug and play? and it should pass emissions fine right? sorry for the hijack guys!
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Old 08-18-2005, 05:11 PM   #10
subbyspeed
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Quote:
Originally Posted by kheff46
i'm doing the same swap in a week or two! i'm trading my wrx turbo and tmic(stock) and $700 for an '01 rs engine(66k) harness and ecu. it's too good to pass up. with everything i got what will i still need to complete this? help if you can! will this be a quick plug and play? and it should pass emissions fine right? sorry for the hijack guys!
what car is this going into?
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Old 08-18-2005, 05:57 PM   #11
kheff46
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1998 impreza OBS(2.2 5spd, phase I).
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Old 08-18-2005, 06:23 PM   #12
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Here's a plan
put your EJ22 heads on the EJ25 shortblock. that's all you need to do. You get good gain and low end. With this you can just use you intake manifold. All you're changing with this is just the shortblock. All the sensors and stuff are on the intake manifold and exhaust.

Just don't run the EJ25 intake manifold, run yours and your heads.
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Old 08-18-2005, 07:03 PM   #13
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kheff, thats kinda expensive. honestly. if you get a gearbox too perhaps its a good deal.
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Old 08-19-2005, 09:28 AM   #14
kheff46
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700 for engine(w/header), ecu, and wiring harness, and all sensors.that's expensive for a 66k motor? i thought i've seen them go for more than that.
fuji k- that's a good idea, what CR do i get(need high test?)? which headgasket would be best for that? does my intake make the 2.5 a worthless swap? is it gonna run crappy? i'll wire in the 2.5 harness if so.
could i rewire the '01 harness into a '98 harness plug or something like that so it plugs into my car's existing chassis harness? just a thought.
are these my only options?
thanks a lot guys! this helps!

Last edited by kheff46; 08-19-2005 at 09:54 AM.
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Old 08-20-2005, 02:58 AM   #15
FuJi K
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You'll get somewhere like.....almost 11:1 with the phase 1 heads. But depending on head gasket you use....if you use the newer gaskets, which are thinner than it'll yeild you a higher CR of probably 11.5:1.

What you can do is look over the sensors on the 2.5L intake manifold and your 2.2L plug up any holes that you don't need.
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