Some motor swap ?? Need some confirmation

[Loserkidwac]

Oh can someone please confirm some info for me!! People on NASIOC just tell me to search and I have but can't find any confrimed info...

This if for my 96 Impreza Brighton plan to swap out the EJ18 ofr a EJ22

I assume If I grab a 96+ (OBD2) EJ22 all the sensors should be the same...even if its out of a Legacy correct? There is a possibility I'd have to reuse my stock EJ18 Intake mani but I honestly don't think i should if both motors are OBD2.

Could I just use the EJ22 wire harness is it the same as the EJ18 if both are OBD2? I have a Injector circuit Malfunction CEL and my research says ts probably caused by some sheilding rubbed of or a wire grounding...so i wanted to do the swap and use a new harness, worse case I'll just cut and splice in part of the harness to hopefully resolve the problem...

And finally I'd hate to run the stock EJ18 ECU on the EJ22 but it seems that what most people do...why would an OBD2 EJ22 Legacy Brighton ECU work? I'm not afraid to repin the ECU plugs if i have to but I assume it should almost be plug and play....


Ok, thanks for any info...I have a feeling i am going to have to figure this stuff out on my own...

[Honest_Bob]

www.rs25.com will deffinitly be of more help to you than Nasioc.

[Loserkidwac]

Originally Posted by Honest_Bob

www.rs25.com will deffinitly be of more help to you than Nasioc.

Thanks I'll try that out

[PitBullRS]

wrx swap.....?

[TROLL]

rs25.com or petemaicher.com will be your best resources. ok actually to get in touch with the 2nd one i listed just send a PM to teh dirt on here.

if i was doing a swap i'd want to go the distance and get something turbo in there though

[whitezenki]

No matter what he puts in there, it will be turbo when hes done with it. He bought the car to HMT it, blow it up, buy another cheap motor, and repeat.

[Loserkidwac]

Originally Posted by whitezenki

No matter what he puts in there, it will be turbo when hes done with it. He bought the car to HMT it, blow it up, buy another cheap motor, and repeat.

He he he...

That is correct, I've also talked to Pete a little about subies before i picked this up...just looking for an easy bolt in swap, I'd like to stay EJ18 or EJ22 since they seem to be very interchangeable...the EJ25 dosen't seem to take boost to well so I've been trying to avoid that...WRX/STI swaps are to much $$ and not worth it to me...

I just really need some info on the wiring and ECUs...most of my research turns up threads with sontradictive info or lacking anything specific so looks like I'll be on my own, just hoping to find someone whos done it knows for a fact...

[Renegade_]

Originally Posted by Loserkidwac

the EJ25 dosen't seem to take boost to well

It's the compression that screws the motor over. If you can drop it to like 8.5:1 it should take boost just fine. The WRX motor doesn't have forged internals and neither does the RS bottom end. If you can get the compression ratio down boosting it shouldn't be a problem. They are like... 9.5 or 10:1 stock

[Loserkidwac]

Originally Posted by Renegade_

It's the compression that screws the motor over. If you can drop it to like 8.5:1 it should take boost just fine. The WRX motor doesn't have forged internals and neither does the RS bottom end. If you can get the compression ratio down boosting it shouldn't be a problem. They are like... 9.5 or 10:1 stock

Hmmm...I though it also had to do with the fact that the EJ18, EJ22, and EJ25 used the same open deck block and the cyl wall were narrowed/bigger bore used to up displacement...someone correct me if I am wrong...

That is why I was thinking EJ22, atleast so i could spool a decent size turbo


Oh also the info i could on CR ratio

EJ18 - 9:1
EJ22 - 9:1
EJ25D - 9:1 (96 Legacy)
EJ25 - 9.7:1 (98-99)
EJ25 -10:1 (00+)

[Renegade_]

Originally Posted by Loserkidwac

Hmmm...I though it also had to do with the fact that the EJ18, EJ22, and EJ25 used the same open deck block and the cyl wall were narrowed/bigger bore used to up displacement...

http://www.rs25.com/forums/showthrea...ght=EJ25+turbo

The block itself isn't the problem, it's the compression. The block ended up blowing up but they reached over 500 HP before it did.

[redwrxwagon02]

dude if u can find an ej22t block and bottom end your set
the ej22t's are stronger than factory sti blocks think about it this way
the jdm legacy b4 twin turbo uses the ej22t block and those lil guys can hold alot of boost

[Loserkidwac]

Originally Posted by redwrxwagon02

dude if u can find an ej22t block and bottom end your set
the ej22t's are stronger than factory sti blocks think about it this way
the jdm legacy b4 twin turbo uses the ej22t block and those lil guys can hold alot of boost

Thats the Older late 80's-early 90's legacy turbo motor correct? I'm keeping my eye out but who knows whatever is cheap when I decide to buy a motor is what I'll get


If the compression on the EJ25 is really the problem tuning should be able to get around that...but maybe I'll keep an eye out for a 96 Legacy with an EJ25D since that list shows it with a 9:1 CR...

If someone could help me out...all the Subies at the junkyard say like EJ18 or EJ25...but I see people list a last letter or number (exp. EJ25D, EJ255) where is that found, is it stamped on the block too and I just haven''t found one yet??

[teh DIRT]

ya ya ya. haha i liked the petemaicher.com thing.


Ok heres the deal, there is some misinformation in this thread too, eek. All things that I will post are facts to MY knowledge.

The compression ratio of the ej22e and the ej18s are both 9.5:1. That is stated in my owners manual and I trust that over, well anything.

The compression ratio of the EJ25X's range from 9.0:1 to 10:1. I know of an EJ25D block that made 400whp, sure its internals were forged but hey we arent talking particulars...lol.

The FULL engine code is on the vin plate that is attached to the drivers side strut tower.

There are, to my knowledge:

ej18s
ej22e
ej22t
ej255
ej25d
ej257
ej205
ej207
ej20g
ej20k

thats what I have seen in my days.

As far as your swap, OBDII and me never got along, thats why I sold my 96 for a 95. The ej22e and ej18s use the same intake manifold, same style fuel rails, same style injectors, same style harness. etc etc.

As far as compatibility there are somethings that might work and might not. Ive read in the past two days of people swapping in ej22's and having them not run right.

My argument is that you need to keep the ECU happy, at all times at all costs. Sure the ej22 harness and ecu might work, but I am not positive and in the recent past have seen them not work out. I do know that the ECU will never know what type of engine is in the car unless you let it.

If you take an ej22, basically a bigger ej18...and put it in your car using all of the ej18 wiring....the ECU knows no different. Now this becomes a problem for most because of this....


1. Injectors: the ej22 and ej18 injectors do not have the same flow rate. When you use ej22 injectors on an ej18 ecu it will run rich because the ECU is firing them like it would ej18 injectors but in reality it needs to be slightly different. It will surely run with no extra tuning, but not to its full potential. My advice is to spend 100 bucks on an used SAFC to fine tune the engine, its simple and effective. I even have a HUGE writeup on www.rs25.com on how to install it into a 96 impreza.

With this you can get the car running just like it did from the factory if not better.

If you plan on turboing it after all of this then screw the SAFC and go emanage. Youll need it to pull timing and have better control of the engines functions.

So in the end:

[96 Impreza - ej18s + ej22e + ej18 wiring and sensors (including cam and crank position) + turbo + emanage] x 2= the win

[Renegade_]

Originally Posted by teh DIRT

Ok heres the deal, there is some misinformation in this thread too, eek.

Ah crap, what did I screw up this time?

Add EJ251 to that list too, thats what my plate says for my N/A 2.5L

[Loserkidwac]

Thanks Pete that really helps clear a lot of things up I've been searching RS25.com and damn that site has tons of good info!!

The only real concern I have with my stock harness is the Injector circuit Malfunction CEL, I am just gonna hope that there is clear break in a wire...


Oh also, why not run the EJ18 injectors in the EJ22? I assume it would run a little lean? which would be fine for N/A

I honestly was thinking of just doing an FMU (I know, I know) just to get it boosted and since its not a DD I could care less if it blew up...but just run low boost and FMU and save up for an E-manage Ultimate (You talked me into it Pete)

Do people do OBD1 conversion in Subies? or is that just us Honda guys?

[Renegade_]

Originally Posted by Loserkidwac

Oh also, why not run the EJ18 injectors in the EJ22? I assume it would run a little lean? which would be fine for N/A

With an SAFC why not just get bigger injectors? You can always lean it out if the injectors are too big

Originally Posted by Loserkidwac

Do people do OBD1 conversion in Subies? or is that just us Honda guys?

Nah, if you swap in any pre-v7 motor into an RS you will be doing an OBDII --> OBDI conversion which is what it looks like I am gunning for

[RyanG]

in order to do an OBD2- OBD1 conversion, the entire harness in the car would have to be replaced. and I mean EVERYTHING.

which also means, the harness most likely wont plug into the interior stuff ie:HVAC controls etc.

Not only that, some Subs came with cable clutches, some with hydraulics. also cable seed sensors... meh..

[Renegade_]

Originally Posted by AREA1320

in order to do an OBD2- OBD1 conversion, the entire harness in the car would have to be replaced. and I mean EVERYTHING.

which also means, the harness most likely wont plug into the interior stuff ie:HVAC controls etc.

If I buy an entire front end clip (minus trans) what are some difficulties that I might encounter with a RHD conversion? I thought if I did a full RHD conversion this eliminated all these difficulties?

[RyanG]

Originally Posted by Renegade_

If I buy an entire front end clip (minus trans) what are some difficulties that I might encounter with a RHD conversion? I thought if I did a full RHD conversion this eliminated all these difficulties?

If you get the model year of your car ie v5-v6 you wont have an issue.

If you don't-
no ABS for one. harness wont plug into that
you would need to swap the ENTIRE interior ie: dash, controls etc etc. the window controls would need to be rewired, as well as the rear harness unless you swap that. But hell, you would need to rewire the rear of the car anyway lol.

Not only that, the dash wont mate up to the door cards anyway unless you get your model dash or newer.

[teh DIRT]

yeah it can be a bitch. Swapping harneses, like ryan said, is pretty much the same as you would do for a WRX swap. Some connections work, some dont...and those you are gonna have to splice.


This injector malfunction thing is foreign to me because I run 550cc injectors on a car that had <200cc injectors in it stock and I have no cel....the glory of OBDI