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Old 10-01-2018, 07:56 PM   #1
snow_bound26
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Default JDM EJ205 information thread

Since the JDM EJ205 swap has become so popular, this is my attempt to put as much information into one thread as possible so we can more easily direct people to answers for their questions. This is all information I have gathered over the last few months and from doing my own swap in May.

To start off with, the JDM 205 doesnít have the same V7, V8, etc common names as the 207. What we have is: wire on plug non-avcs, coil pack on plug w/avcs, or coil pack on plug and Drive-by-Wire (DBW) w/avcs. These can come from WRX or Forester XT.

Here we go:
1999-early 2001 (there is a bit of mixed info so anyone with exact information let me know so I can edit) Was actually a 207 but is sometimes sold as a 205 on eBay. These were wire on plug without avcs. CR 8.0:1
Fairly straight forward swap using USDM ecu. Can be changed to coil pack on plug to work with USDM ecu. To my knowledge only ADM had an actual EJ205 during these years. ADM and EDM variants may have had a different compression ratio. This was the base for the USDM EJ205. Not sure if cam or crank sensors need to be swapped. Have read some people swapped cam gears. Not sure if it was precautionary or not.

2001-2005 JDM WRX/late 2002-2004 Forester XT had the EJ205 w/single avcs and coil pack on plug. Most information I have found states all variants had 9.0:1 CR. ADM and EDM had various CRs due to difference in fuel quality. Depending on sub-model they had anywhere from 212hp to 250hp. WRX came with various TD04 models. Forester commonly came with TF035 turbo. Most importers usually list all variations as WRX. A couple will actually say if it came from a Forester. Easy way yo tell is the coolant crossover pipe. WRX will point straight at the radiator. Forester will point toward right hand headlight.

Swap can be done in two ways:
Use avcs and matching JDM ecu to run avcs. This requires adding 4 wires plus a shield wire from the ecu to the wiring harness and moving 4 wires on the left hand side on the wiring harness. If you want to retain TGVs then youíll need to add wires across the wiring harness. Diagram can be found here:

https://drive.google.com/file/d/0B4s...jZDM1YWE4/view

This was technically made for the 207, but the avcs for the 205 is the same. The other way is to buy a pre-made wiring kit from IA Tuning or iWire. Both companies also have ecu pins, connectors and various other parts to complete your swap. The pre-made kits take the guess work out of reading the diagram and are the most common recommended approach to wiring avcs. Some have TGVs with the butterfly plate and some donít. Mine came with butterflyless TGVs. This leaves you with two choices when using avcs; either delete the butterflies and repurpose the TGV wires for avcs, or keep the TGVs functional and run the additional wires for avcs. I do not know any wiring diagrams for this. Tuning is done with Open Source.

The other way to do the swap is to use your USDM ecu and not use avcs. The JDM 205 w/avcs is basically plug and play. However, without using avcs the intake cams will always be fully retarted. It is debated whether this restricts power potential, but general consensus is that it doesnít run as well or as smoothly this way. You can swap cams, cam sensors, and cam gears to overcome this issue. I have read some people also swapping crank position sensor as well. Tuning can be done with a Cobb Access Port or with Open Source.

Late 2005+ WRX/Late 2004-2008 Forester XT was essentially the same as the previous single avcs engine but came with a DBW throttle body. This swap takes the most effort since you need all the parts to make it Drive-by-Cable (DBC). If you have these parts then the swap would be the same as either way mentioned above. Some of these have EGR and some don't. It appears this is only on some of the DBW versions.

There is some information (but not much) supporting the JDM Forester XT having an 8.2:1 CR that was changed to 8.4:1 in 2004 with the change to DBW. Most information has supported that all JDM 205 variants have 9.0:1. From the limited information I have found, it appears the heads have the same flow and casting as the USDM S20 heads. I have not been able to find cam profiles yet. Red line is the same at 7000 and limiter kicks in at 7200. Some have functional TGVs and some are butterflyless. I haven't been able to find a rhyme or reason to which MY or sub models have/don't have. There are plenty of DIYs on how to delete them as well as several shops that will do the deletes if you send them out.

If you get an engine from a Forester, the coolant crossover pipe, power steering pump and AC compressor will be different. You can either use the cross over pipe from a WRX or get the upper radiator hose from a Forester. Itís easiest to use the PS pump and AC compressor from a WRX otherwise you will need to change fittings and/or lines. Some have an oil cooler. Some donít. All have the same oil pan as the USDM 205. Gas lines may have clamps instead of quick connects. Many of these engines came out of AT cars and as a result they donít have timing belt guides. If you are pairing this with a MT make sure you check for those guides and add if needed. Without them your timing belt may jump teeth. That can equal a bad day.

There are many 2.0 liter EJ variants out there. Most refer to versions prior to 1999. One in particular doesnít; EJ20X and EJ20Y. These are from JDM and ADM turbo Legacy models. These are not direct replacements for the EJ205. They are dual avcs, use a 32bit ecu, and need many changes to make work in 02-07 WRX.

As with all swaps, set extra money and time aside. These engines have been sitting around for years potentially. At a minimum you should replace the following:
Valve cover gaskets
Half moon seals
Spark plug seals
Exhaust gaskets
Turbo inlet pipe (OEM becomes brittle and tears)
Coolant
Oil
Timing belt, tensioner, idlers, and water pump
Accessory belts
Vacuum and coolant lines
Throttle body gasket
Clean IACV and replace gasket
Clutch (depending on current mileage)
Intake manifold and TGV gaskets
Get fuel injectors cleaned and new O rings
Catless up pipe
Spark plugs
(Prepare for new coil packs. I had to replace mine 2 months later)
E-tune or Pro tune

If you are planning on future mods, this is a good time to upgrade or add in the following:
Phenolic spacer
Larger fuel injectors
STi or better oil pan
Killer B oil pickup and baffle
EBCS
Aluminum radiator
Fluidampr crank pulley (yes these make a difference)
Master cylinder brace (much easier with everything out of the way)
Group N motor mounts and pitch stop

If anyone finds information in here inaccurate, please let me know and give a link to the correct information so I can edit this. I hope this helps everyone be able to direct people to a place that answers most of their questions.
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Last edited by snow_bound26; 09-24-2019 at 04:07 AM. Reason: Content
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Old 10-01-2018, 10:07 PM   #2
D-Rodman
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You may want to mention that some jdm ej205 with avcs also have TGV. Something to keep in mind when enabling avcs by repurposing the stock TGV pins.
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Old 10-01-2018, 10:38 PM   #3
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Quote:
Originally Posted by D-Rodman View Post
You may want to mention that some jdm ej205 with avcs also have TGV. Something to keep in mind when enabling avcs by repurposing the stock TGV pins.
Done and thanks
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Old 10-02-2018, 02:17 PM   #4
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i noticed some DBW engines have EGR and some don't. when i was shopping for one i got one without the EGR but had the DBW throttle body and no TGV.
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Old 10-02-2018, 03:05 PM   #5
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Quote:
Originally Posted by CarmelValleyWRX View Post
i noticed some DBW engines have EGR and some don't. when i was shopping for one i got one without the EGR but had the DBW throttle body and no TGV.


I wish there was a way to track down years they did little changes like this. Seems as though TGVs are an odd ball for all MYs. Thanks.
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Old 10-02-2018, 05:04 PM   #6
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I have a DBW JDM 205, I just swapped the harness and manifold to get it to work. I just realized that my uppipe has an EGT, so my JDM uppipe is catted? Weird thing is I was told that I shot a flame one night. Iím fully catless behind the turbo
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Old 10-02-2018, 05:35 PM   #7
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my jdm had a catless up pipe. the headers are also different than the USDM ones. the jdm seemed smaller and had different castings and crossover pipe. it also had the TF03 turbo.
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Old 10-02-2018, 05:50 PM   #8
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Default JDM EJ205 information thread

Quote:
Originally Posted by BugeyeJay View Post
I have a DBW JDM 205, I just swapped the harness and manifold to get it to work. I just realized that my uppipe has an EGT, so my JDM uppipe is catted? Weird thing is I was told that I shot a flame one night. Iím fully catless behind the turbo


Did you use the avcs? DBW ones appear to be catless up pipes. All OEM up pipes have an EGT sensor. But as I stated it's just a matter switching everything associated with DBC to the DBW engine.

Last edited by snow_bound26; 10-02-2018 at 05:58 PM.
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Old 10-02-2018, 05:51 PM   #9
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Quote:
Originally Posted by snow_bound26 View Post
Did this go into and 06 or newer?


Sorry. This went into an 02 Bugeye
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Old 10-02-2018, 05:52 PM   #10
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Quote:
Originally Posted by CarmelValleyWRX View Post
my jdm had a catless up pipe. the headers are also different than the USDM ones. the jdm seemed smaller and had different castings and crossover pipe. it also had the TF03 turbo.


Iím assuming yours doesnít have an EGT sensor in the uppipe
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Old 10-02-2018, 05:52 PM   #11
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Quote:
Originally Posted by CarmelValleyWRX View Post
my jdm had a catless up pipe. the headers are also different than the USDM ones. the jdm seemed smaller and had different castings and crossover pipe. it also had the TF03 turbo.


Most likely came out of a forester. Headers are different but are usable. Not sure about pipe diameter but the cross pipe isn't a flex pipe.
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Old 10-02-2018, 05:59 PM   #12
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Quote:
Originally Posted by BugeyeJay View Post
Sorry. This went into an 02 Bugeye


Was thinking about a conversation I had with a friend about his car and wasn't paying attention. I edited my thoughts when I realized it
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Old 10-02-2018, 06:02 PM   #13
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Quote:
Originally Posted by snow_bound26 View Post
Did you use the avcs? DBW ones appear to be catless up pipes. All OEM up pipes have an EGT sensor. But as I stated it's just a matter switching everything associated with DBC to the DBW engine.


I am not using AVCS. And from what I read only 02-05 had EGT sensor for cats and that the only reason itíd be there
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Old 10-02-2018, 06:07 PM   #14
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Quote:
Originally Posted by BugeyeJay View Post
I am not using AVCS. And from what I read only 02-05 had EGT sensor for cats and that the only reason itíd be there


Interesting. The DBW 205 I looked at before buying a DBC one had an EGT in the up pipe. Was catless as well. Unfortunately Subaru does a lot of changed during production runs. This is why I created the thread is to get all of these idiosyncrasies in one place.
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Old 10-02-2018, 06:11 PM   #15
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Quote:
Originally Posted by snow_bound26 View Post
Interesting. The DBW 205 I looked at before buying a DBC one had an EGT in the up pipe. Was catless as well. Unfortunately Subaru does a lot of changed during production runs. This is why I created the thread is to get all of these idiosyncrasies in one place.


How were you sure it was catless? Iíve been reading around that JDM uppipes weíre catted with a metal cat that is different from the USDM one
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Old 10-02-2018, 06:20 PM   #16
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i have never seen a catless pipe with an EGT bung other than some aftermarket ones for USDM cars.
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Old 10-02-2018, 06:37 PM   #17
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Quote:
Originally Posted by CarmelValleyWRX View Post
i have never seen a catless pipe with an EGT bung other than some aftermarket ones for USDM cars.


A friend with an 08 STi has an EGT in his up pipe. He has had a lot of work done and had it added. I never did ask him. Just saw it when I was helping him with some suspension work. I know it's the OE up pipe though as it has the heat shield on it.
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Old 10-02-2018, 06:39 PM   #18
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Quote:
Originally Posted by BugeyeJay View Post
How were you sure it was catless? Iíve been reading around that JDM uppipes weíre catted with a metal cat that is different from the USDM one


It didn't have the bulge that I've seen in catted up pipes including the one from the engine I bought.
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Old 10-02-2018, 09:08 PM   #19
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So just talked with my friend with the STi and he did have the EGT installed. It sure why he did it in the uppipe since it doesn't give an accurate measurement of which cylinder is running hotter but whatever. As far as JDM cats being different then US ones, I'm not sure. The DBW 205 I was looking at had an EGT but no bulge in the heat shield. Anyone who buys one of these can just simply look down the pipe with a flash light and it either has cat material in it or not. If it does, it's recommended to replace it since the cat is known to break apart and destroy the turbo.
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Old 10-11-2018, 10:22 PM   #20
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I read all jdm wrx ej205s are drive by cable through 2005, any truth to that?

I found this post very helpful, I have been having a hard time differentiating between the wrx and Forester engines. Assuming the above is true, you can be fairly certain whether you have a Forester engine or wrx by the crossover pipe and whether it's DBC or DBW.

Interesting looking at posts on eBay and seeing how many are incorrect.

Cheers!
Nick
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Old 10-12-2018, 08:24 AM   #21
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Quote:
Originally Posted by Nlmoschitta View Post
I read all jdm wrx ej205s are drive by cable through 2005, any truth to that?



I found this post very helpful, I have been having a hard time differentiating between the wrx and Forester engines. Assuming the above is true, you can be fairly certain whether you have a Forester engine or wrx by the crossover pipe and whether it's DBC or DBW.



Interesting looking at posts on eBay and seeing how many are incorrect.



Cheers!

Nick


eBay is all about key words for selling purposes. Since most people haven't really researched this stuff they look for WRX in the title and assume everything is correct.

The crossover pipe is the easiest way without having VIN or engine code numbers.

As for WRX DBC, I believe they are DBC through MY2005, but actual production date may vary with that since most would have actually been built in 2004.
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Old 10-15-2018, 12:09 PM   #22
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A couple of notes:

On the avcs cams you can plug the oil holes in the cams as a way to disable avcs retarding your cam timing on a non-avcs installation. Keep in mind that this generally requires removal of the intake cams and will need to be done BEFORE installing the engine in the car.

Another thing is that AVCS use in a car with a 4EAT has not been documented. When doing this swap, I was unable to get a JDM ECU to work with a USDM 4EAT. The car wouldn't shift properly once the ECU was installed.

Since that time, I've some information has come up that indicates it may be possible to accomplish this with a Forester ROM...but I've had no time to test that. For now...I would advise anyone with a 4EAT to plan on NOT using AVCS.

Phil
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Old 10-15-2018, 09:14 PM   #23
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Thanks for adding that in. I have zero experience with autos. Plugging the oil holes in the cams is do at your own risk. While it's easy to do and has been documented, if it's not done properly can have serious consequences. Just a word of caution
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Old 10-16-2018, 09:50 AM   #24
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With the help of a garage and a couple of friends and a ton of reading here from you guys, we just completed a v9 ej205 swap into a bugeye.
From what I read, the WRXs in japan also use single scroll EJ207s vs WRX WAGONS, that use EJ205s - could be wrong on this one tho, date code of the engine is 2005, but was in use in 2006, similar to my 2001 engine of my factory bugeye.

Engine specs:
9:1cr
TGVs
AVCS
Drive by Cable
Big port heads HT20s,

Install: What worked:
Used the JDM stock intake manifold - drive by cable
Cam and Crank sensors were both OK on jdm engine, did not change (this probably goes for everything 2002+, check for the black sensors, not red/orange)
Alternator
Power steering
Coils
JDM Engine harness 100% pin for pin ok

What to change:
AC compressor is junk, I should have just removed it, but the compressor hoses face the wrong way,

Engine sounds really healthy, seems to be ok puttering around town on her maiden voyage as we got a few things wrong on the initial install.. so it literally just came together last night!

USDM Bulkhead harness
JDM V7 ecu
JDM Engine harness

Mods to the engine include:
STI Dark Blue Top Feed Injectors (MAKE SURE TO LUBE UP ALL O-RINGS WITH VASALINE BEFORE INSTALL - ELSE YOU ARE LOOKING AT ANOTHER 2-3 HRS OF WORK AFTER THE ENGINE IS IN THE CAR )
VF48 - jm turbo, cheap..
Avo inlet

And also added a Wideband O2 by PLX systems.

This plus the Carberry ROM is a really potent combination in the hands of the right tuner that can understand all the parameters. Hang on to those 2002-2003 USDM wrx ecus and JDM ecus.

now im just looking for instructions on the AVCS wiring - the IA/iWire stuff is >$200 canadian shipped to me......... so im going to try and google... if anyone has clearer instructions on the pins to the black connector (driver side) to the e84 (ecu side) that would be great. most of what i found reuses the TGV and in canada I will be using my TGVs..
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Old 10-16-2018, 09:56 AM   #25
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Try iwire for the avcs bulk wires
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