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Old 05-06-2018, 11:25 AM   #1
snow_bound26
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Default JDM 205 avcs questions

Sorry to create a new post but Iíve been searching and canít find some of the specifics I have questions about. I bought a complete JDM 205 with trans and matching diff (I have a couple questions on the trans as well and there is a thread in the trans section. If anyone has any input on that Iíd appreciate it as well). Going into an 05 9-2x.

Code on timing cover is: EJ205DWUBE-083 585089 9R10
Comes back as 02-03 Forester Turbo/02-05 WRX

These are specifically AVCS engine related questions. Please do not give non-avcs related advice. I will be using avcs and have an ecu.

Info I canít find:
It is coil over plug. Are they the same as UDSM models? Going to ask my tuner what plugs he recommends.

People say to change the power steering pump, alternator, and AC compressor. Have seen a couple post saying to reuse the JDM power steering pump. Have not seen any posts about why to switch these. From cursory inspection they look the same, though I havenít started tearing it apart yet (waiting for gaskets, seals, and things to arrive).

Have also seen people say to replace with USDM exhaust mani. Why? They look the same from what I can see.

Timing components. Are the belts and pulleys the same? I know to use USDM water pump for the oil cooler.

One of the big questions is the wiring harness. From what I have been able to figure out is keep the wiring that exists on the engine (itís complete from what I can see) and make the appropriate changes into the US loom to the ecu? When they did the compression test, one of the plugs was crushed on the passenger side. Does anyone have a wiring diagram so I can re-pin it with matching one from my US engine? If not, are the wire colors the same except for the avcs wires?

And last, since I am running avcs, I should keep all the JDM sensors for timing, crank position, etc? The one Iím questioning the most is the crank timing parts since Iíve seen multiple threads saying to change them. But this is also where people just randomly talk avcs/non-avcs rather then sticking to what the OP started with asking.

Thank you for any advice I can get. I plan on compiling all the info Iíve found into one post that details the avcs vs non-avcs swap specifically so we can point he right direction a little easier.
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Old 05-07-2018, 05:42 PM   #2
snow_bound26
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Anyone?
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Old 05-08-2018, 09:55 PM   #3
181stLeader
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Lets see here:
Quote:
Originally Posted by snow_bound26 View Post
Sorry to create a new post but Iíve been searching and canít find some of the specifics I have questions about. I bought a complete JDM 205 with trans and matching diff (I have a couple questions on the trans as well and there is a thread in the trans section. If anyone has any input on that Iíd appreciate it as well). Going into an 05 9-2x.

Code on timing cover is: EJ205DWUBE-083 585089 9R10
Comes back as 02-03 Forester Turbo/02-05 WRX

These are specifically AVCS engine related questions. Please do not give non-avcs related advice. I will be using avcs and have an ecu.

Info I canít find:
It is coil over plug. Are they the same as UDSM models? Going to ask my tuner what plugs he recommends.
They are coil on plug just like your engine

People say to change the power steering pump, alternator, and AC compressor. Have seen a couple post saying to reuse the JDM power steering pump. Have not seen any posts about why to switch these. From cursory inspection they look the same, though I havenít started tearing it apart yet (waiting for gaskets, seals, and things to arrive).
Its easier when you swap the motor to keep the A/C compressor connected and just move it to the side so you dont lose any of the refrigerant and have to recharge it. Also some JDM compressors may be different, reusing your makes sure it works with the cars A/C lines. Power steering pump and alt are the same as what you have, use either, its up to you.

Have also seen people say to replace with USDM exhaust mani. Why? They look the same from what I can see.
if it is a single scroll UEL header its the same, no reason to change it

Timing components. Are the belts and pulleys the same? I know to use USDM water pump for the oil cooler.
They are the same, you new motor may not have the timing belt guides in the corners if it came from an auto.

One of the big questions is the wiring harness. From what I have been able to figure out is keep the wiring that exists on the engine (itís complete from what I can see) and make the appropriate changes into the US loom to the ecu? When they did the compression test, one of the plugs was crushed on the passenger side. Does anyone have a wiring diagram so I can re-pin it with matching one from my US engine? If not, are the wire colors the same except for the avcs wires?
The wiring will be identical to the USDM car except for the AVCS wires and lack of TGV wires(you can use the USDM TGV wires to run as some of the AVCS wires by repinning a couple conectors.

And last, since I am running avcs, I should keep all the JDM sensors for timing, crank position, etc? The one Iím questioning the most is the crank timing parts since Iíve seen multiple threads saying to change them. But this is also where people just randomly talk avcs/non-avcs rather then sticking to what the OP started with asking.
if you plan to run AVCS and use the JDM ECU(which you should, AVCS is awesome!) use all the sensors that come on the JDM motor. There can be issues with the crank/timing parts as subaru used at least two different trigger setups. But that shouldnt effect you as you have teh matching ECU.

Thank you for any advice I can get. I plan on compiling all the info Iíve found into one post that details the avcs vs non-avcs swap specifically so we can point he right direction a little easier.
Make sure you get the car tuned! The JDM tune on the factory ECU will be too aggressive timing wise and will knock on US gas especially if you can only get 91. Also you cant use a Cobb accessport with the JDM ECU, so you have to go open source.
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Old 05-10-2018, 11:14 AM   #4
swansong
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I did a nearly identical swap, JDM EJ205 with AVCS from a Forester Turbo into my 2004 WRX. I used the matching JDM ECU, came with the car. My answers are by no means gospel, just what I learned/did from the swap.

Quote:
Originally Posted by snow_bound26 View Post

Info I can’t find:
It is coil over plug. Are they the same as UDSM models? Going to ask my tuner what plugs he recommends.
I used NGK 2667 BKR7EIX Iridium IX Spark Plugs, no issues. I did have a JDM coil crap out on me, so I swapped back the USDM ones. Going to use Cosmic Racing's coils once I install them.

Quote:
People say to change the power steering pump, alternator, and AC compressor. Have seen a couple post saying to reuse the JDM power steering pump. Have not seen any posts about why to switch these. From cursory inspection they look the same, though I haven’t started tearing it apart yet (waiting for gaskets, seals, and things to arrive).
I reused my USDM PS pump, alternator, and AC compressor. It was easier that way, plus the PS pump and AC compressors didn't match up 100% between US and JDM.

Quote:
Have also seen people say to replace with USDM exhaust mani. Why? They look the same from what I can see.
I wondered that as well, as they look similar, and the JDM one was in better shape and had a flex section. But I ended up using the USDM header just for simplicity. I did have to switch to a narrower Purolator PL14615 after the swap due to a difference clearance to the oil cooler lines.

Quote:
Timing components. Are the belts and pulleys the same? I know to use USDM water pump for the oil cooler.
Timing stuff is all the same. I used the Gates TCK328 kit, no issues. Used a new OEM 21111AA026 water pump though. 181stleader had a good call on the timing belt guides, my motor must have been mated to a manual since it had the guides.


Quote:
One of the big questions is the wiring harness. From what I have been able to figure out is keep the wiring that exists on the engine (it’s complete from what I can see) and make the appropriate changes into the US loom to the ecu? When they did the compression test, one of the plugs was crushed on the passenger side. Does anyone have a wiring diagram so I can re-pin it with matching one from my US engine? If not, are the wire colors the same except for the avcs wires?
I used IAPerformance's AVCS wiring kit. Expensive (~$200), but super easy, clean, and straightforward install. If you can find the diagrams, you can certainly wire it in yourself. The important part is just finding a way to get the AVCS sensors/connectors wired back to the appropriate pins on the ECU connector.

Quote:
And last, since I am running avcs, I should keep all the JDM sensors for timing, crank position, etc? The one I’m questioning the most is the crank timing parts since I’ve seen multiple threads saying to change them. But this is also where people just randomly talk avcs/non-avcs rather then sticking to what the OP started with asking.
Yep, keep all of those sensors. And the cam gears. And the intake manifold. I'll never understand why anyone buys an AVCS motor and then doesn't use the AVCS, or swaps out to the USDM intake.

Quote:
Thank you for any advice I can get. I plan on compiling all the info I’ve found into one post that details the avcs vs non-avcs swap specifically so we can point he right direction a little easier.
Other tidbits.
Definitely get a base tune asap, preferably before leaving your driveway, to account for the higher 9.0 compression ratio and other JDM peculiarities.
The upper radiator hose will connect to the crossover pipe at a different angle with a Forester 205. The WRX hose will not fit, so either hack something up to work (I did), or perhaps a Forester hose fits, I didn't try.
I strongly suggest replacing any brittle vacuum/coolant hoses while the engine is on the stand.
Also replace the valve cover gaskets, but be aware that they're different on JDM AVCS cars. I used 13272AA075 and 13270AA152 gaskets, and USDM halfmoons and bolt gaskets.

I think that's all I got. It's a straightforward swap, and the extra compression, better heads, AVCS, and no TGVs really wakes the car up. Oh and I swapped to a different turbo, downpipe, uppipe, turbo inlet, etc, so there's that too lol.
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Old 05-11-2018, 06:46 AM   #5
snow_bound26
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Thanks for the info guys. I was already planning on using the wrx coolant crossover pipe and have all the gaskets including the avcs valve cover gaskets. Turns out one of the coils that came with it was damaged so I’ll be using the USDM ones.

I’m hoping to use the JDM PS pump as mine leaks almost as bad as Rudy Giuliani’s mouth. My ac compressor is making a metallic bearing noise. It works, but not sure for how much longer. Brother in law is an hvac tech so I know he can help out with some of this stuff. I was just more concerned with lines/hoses/connection differences. I did pull the belts from both engines and they look identical in width and length. I should have been more specific. Sorry about that.

Engine came with manual trans still connected and matching rear diff. So I’m switching to 4.44 fd for a bit more performance. After talking with my tuner, I’m going to get the wires ready and solder the pins on so that he only has to connect the new wires and repin the TGV wires for avcs.

So the compression ratio is confusing me. Where do you guys get the specific info like that? I haven’t found anything concrete for this engine specifically. I was able to narrow down that it came from a late 02/early 03 Forester. Info from different sources sounds like it could have 8.2:1, 8.4:1, or 9.0:1 CR. I know there were different turbo options on these as well since this one came with a TF035 which is even smaller then the TD04 we have. Just want to be able to give my tuner as much info as possible so he has a starting point and I have an idea about how it will affect the upgrades I’m doing.
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Old 05-15-2018, 01:56 AM   #6
181stLeader
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It hard to say what the compression is exactly. it shouldn't rally matter the tuner will be able to tune it just fine. I would put a vf turbo on it with some sti/2.5Lwrx topfeeds.
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Old 05-15-2018, 10:31 PM   #7
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I'm almost in this exact position myself. All the info I've gotten is that the jdm ej205 avcs engine is side feed; are they actually topfeeds?
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Old 05-17-2018, 06:21 AM   #8
snow_bound26
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Mine are top feed. It’s easy to tell. Look at the fuel rail. Top feeds will be exactly that; fed from the top by the fuel rail. The injectors that came with mine were the same as what was in my original engine, light blue top feeds.
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Old 05-17-2018, 06:24 AM   #9
snow_bound26
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Quote:
Originally Posted by 181stLeader View Post
It hard to say what the compression is exactly. it shouldn't rally matter the tuner will be able to tune it just fine. I would put a vf turbo on it with some sti/2.5Lwrx topfeeds.
Donít have the budget for a vf right now. Doing a lot of other things so that itís ready for an EFR 6258 next year. I am putting in STi dark blues though since even the TD04 will benefit from them.
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Old 05-17-2018, 11:21 AM   #10
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Quote:
Originally Posted by snow_bound26 View Post
Mine are top feed. Itís easy to tell. Look at the fuel rail. Top feeds will be exactly that; fed from the top by the fuel rail. The injectors that came with mine were the same as what was in my original engine, light blue top feeds.
Thanks man. I just pulled the trigger on the engine today and as of right now all I have are the pics from the eBay ad and I can't see far enough on the IM to see what's what.
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Old 05-29-2018, 05:55 PM   #11
snow_bound26
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So tried to start the car today. Getting power to all accessories. AP says battery had 11.4 volts. Starter clicking rapidly.

Have relocated the battery to the trunk. Grounded starter to chassis and battery to chassis. Blew an 80 amp inline fuse. Switched to 100amp. Blew that as well. The starter is the JDM one that came with the trans. Has 2 studs coming off the back. Power wire was attached to one. Ran my power to that one. Is the other for the ground? Nothing was attached to it. Currently have the ground running to it. My USDM starter only has one stud coming out the back and ground was to one of the long bolts. Could use some help with this. Thanks in advance.
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Old 05-30-2018, 03:29 PM   #12
yarrgh
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Your + battery will connect to the stud closest to the drivers side(as the starter is installed).

The other stud goes to the starter motor located right there on the starter assembly. It's about an inch distance. It should be pre-wired. Look up starter images on google.

Since your battery is in the trunk, the starter is grounded through the trans -> chassis -> neg battery.
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Old 05-30-2018, 06:04 PM   #13
snow_bound26
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Quote:
Originally Posted by yarrgh View Post
Your + battery will connect to the stud closest to the drivers side(as the starter is installed).

The other stud goes to the starter motor located right there on the starter assembly. It's about an inch distance. It should be pre-wired. Look up starter images on google.

Since your battery is in the trunk, the starter is grounded through the trans -> chassis -> neg battery.
Got it figured out first thing this morning and she fired right up. Thanks for info though as it let me know that I did figure out the right orientation.
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Old 06-08-2018, 06:50 PM   #14
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Quote:
Originally Posted by snow_bound26 View Post
Got it figured out first thing this morning and she fired right up.
And How? Add to the KB. Thanks
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Old 06-08-2018, 06:56 PM   #15
snow_bound26
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Quote:
Originally Posted by wtdash View Post
And How? Add to the KB. Thanks
One of my grounds wasnít clean enough. So I steel wooled it, reconnected and started her up. It mustíve been making just enough contact to get some juice flowing but not enough for consistent voltage. Not 100% sure though.
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