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Old 09-18-2014, 11:55 PM   #26
ckyguy68
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Quote:
Originally Posted by Dag Yo View Post
Hey guys,

I recently got a used JDM motor and ECU to swap into my '04 WRX. I was told it was essentially "plug and play," though that never seems to be the case. Got everything hooked up (except for the AVCS wiring because that's a headache for another day), the engine runs, but I am getting low compression in cylinder 3. The company I bought the motor from did a compression test at their warehouse and showed 150psi on all 4 cylinders.

Right now I have very little power, and my mechanic and I are kinda stuck. I really don't want to have to pull the motor out and ship it back, so I'm hoping someone has some sage advice, perhaps something I've missed or overlooked that could be causing my compression woes.

Where did you get the motor from? I'm looking into the same swap.
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Old 09-19-2014, 10:21 AM   #27
Dag Yo
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jdmracingmotors.com

So far they've been really helpful. It was actually low compression in cylinder 2 (got my cylinders mixed up). Headed back to the shop today to continue troubleshooting.
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Old 09-20-2014, 05:17 PM   #28
02wrx_bluewrc
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Default jdm swap

You never really know what you are going to get with those engines. Id get the short block redone with forged pistons while its out, probably a ring land :/.
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Old 09-30-2014, 04:34 PM   #29
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Quote:
Originally Posted by Dag Yo View Post
jdmracingmotors.com

So far they've been really helpful. It was actually low compression in cylinder 2 (got my cylinders mixed up). Headed back to the shop today to continue troubleshooting.
Any update?
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Old 10-02-2014, 06:38 PM   #30
Dag Yo
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Hooked the avcs wiring harness to my jdm ecu, no change in cyl 2. Cleaned up the crank position sensor, no change. Reset the timing by hand, no change, but I'm paranoid that the engine may not have been at perfect TDC.

I've heard people claiming that you need to change the crank and cam sprockets, but I dont think that's going to help with my compression.

Also, was wondering if a tune could remedy the timing issue.
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Old 10-09-2014, 04:37 PM   #31
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Quote:
Originally Posted by Dag Yo View Post
Hooked the avcs wiring harness to my jdm ecu, no change in cyl 2. Cleaned up the crank position sensor, no change. Reset the timing by hand, no change, but I'm paranoid that the engine may not have been at perfect TDC.

I've heard people claiming that you need to change the crank and cam sprockets, but I dont think that's going to help with my compression.

Also, was wondering if a tune could remedy the timing issue.
If your cam timing is correct you'll need to do a leakdown test but either way you'll be pulling the head or motor back out.
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Old 10-09-2014, 04:39 PM   #32
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I got my JDM ej205 today. I'll be testing compression on both motors to see if they are actually the same.

I read here on a previous post it was recommended to use the USDM exhaust manifolds and uppipe? Why?

Another thing this myth about JDM engines etc...

My motor had a sticker on the timing belt cover saying the belt was changed @ 130,000 km in 2011 so that's 80k+ miles which sucks kinda

Last edited by elmech; 10-09-2014 at 04:58 PM.
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Old 10-11-2014, 02:23 PM   #33
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Well, so much for JDM. I pulled the intake and looked in the cylinders while moving the engine #4 has lots of oil and even the plug was soaked and full of deposits. Now I have to reassemble and send it back.

I'm thinking I should just order a new 2.0 shortblock and be done with this nonsense.
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Old 10-12-2014, 12:51 PM   #34
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Quote:
Originally Posted by elmech View Post
Well, so much for JDM. I pulled the intake and looked in the cylinders while moving the engine #4 has lots of oil and even the plug was soaked and full of deposits. Now I have to reassemble and send it back.

I'm thinking I should just order a new 2.0 shortblock and be done with this nonsense.
Mine was good. Its kinda a hit or miss deal

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Old 10-14-2014, 06:36 PM   #35
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Hello,

I installed a 2005 JDM ej20 with AVCS into my 2005 WRX. I installed the ia AVCS wiring kit, along with a JDM ECU. I have a Tactrix Openport 2.0 cable and am using the EcuFlash program. I am having a problem trying to read the JDM ECU.

I have sent a debugging log to Tactrix support and I have been told that there seems to be a wiring issue between the OBD2 and the JDM ECU.

Is there a difference in wiring between the OBD2 and ECU from USDM to JDM?
Does anyone have access to JDM wiring schematics?
Does anyone know how to properly communicate with The JDM ECU for CEL or emissions test?
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Old 11-05-2014, 08:26 PM   #36
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Quote:
Originally Posted by saab-story View Post
How did the swaps go? people are waiting your saab stories lol.
Swap went smooth for the most part. Kept all USDM accessories. Just moved them to the side when pulling the motor and dropping the new one in. Swapped all my aftermarket stuff to the new motor. After a few small headaches (coolant and boost leaks) everything got sorted out and the newer jdm ej205 is making more +25whp over the older usdm ej205 with -3psi boost on the vf39

Quote:
Originally Posted by option5 View Post
What is the name of the shop? I'm looking to possibly do this swap soon.
I went to JdmRacingMotors, they are a vendor on nasioc. Great guys, very knowledgeable and fair prices.

Quote:
Originally Posted by snoicyellow03wrx View Post
hello im am looking for help to see if some one has came completed this swap
I have a 03 non avcs impreza wrx I bought the car with a rod knock.
I recently swapped in a jdm ej20 block used all usdm sensors and intake extc. only thing jdm is motor. everything is plugged in all coil packs are receiving 12volts but two cylinders one on each side are not giving a spark and I have used multiple coil pack and plugs.

please if some one would know what is causing this I was told it coud be the ecu but If I used my usdm harness and senors shouldn't I still get a spark? idk please share the knowledge
Not sure what is causing your issue. All I can say is that when I swapped to the jdm ej205 (as stated above) I kept all the usdm accessories and wiring and plugged everything into the jdm ej205, the wiring matches up near perfect.
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Old 11-05-2014, 08:29 PM   #37
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Quote:
Originally Posted by Dag Yo View Post
Hooked the avcs wiring harness to my jdm ecu, no change in cyl 2. Cleaned up the crank position sensor, no change. Reset the timing by hand, no change, but I'm paranoid that the engine may not have been at perfect TDC.

I've heard people claiming that you need to change the crank and cam sprockets, but I dont think that's going to help with my compression.

Also, was wondering if a tune could remedy the timing issue.
When I got my motor from jdmracingmotors they had already changed the cam and cam sprockets to the usdm ones on the motor I bought. May have not been the case for all the motors but I have seen multiple people that said this had to be done.
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Old 11-06-2014, 09:53 PM   #38
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Quote:
Originally Posted by SpecR1081 View Post
When I got my motor from jdmracingmotors they had already changed the cam and cam sprockets to the usdm ones on the motor I bought. May have not been the case for all the motors but I have seen multiple people that said this had to be done.

Could swapping the sprockets fix a compression issue/dead cylinder?

Update on the swap:
There hasn't been time or money enough for me to get the jdm engine running properly, so the Subie's just sitting. I'm hoping the car gets to see some snow under the tires this winter.
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Old 11-13-2014, 02:28 AM   #39
991GT3RS
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No you probably have a bent valve and no wiring or cam gear is going to fix it. The best this to do is take off the valve cover and check the valve lash on the cylinder that you are having issues. If you do have a bent valve you will be able to tell because the lash will be much larger then the rest.
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Old 11-21-2014, 12:54 PM   #40
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Default JDM swap

I just put a JDM ej205 NON-AVCS into my 2002 WRX. It runs great, but needs a tune. The crank and cam gears have to be USDM to use US ecu, as the signals are different. My JDM engine has 9:1 compression instead of 8:1 this is the main reason for the tune. 91 octane will detonate if overboosted into this engine. The shop that will be tuning my car ran the code on the timing cover of the JDM engine and verified the 9:1 compression and told me what year and car it came out of. I kept the JDM turbo and pretty much changed everything else outside the longblock. I cleaned and reused the coolant/oil cooler, contamination is not an issue because the oil is filtered AFTER the cooler. Exhaust and intake manifolds are different. If anyone has questions, let me know.

Last edited by Offroadguy; 11-21-2014 at 01:10 PM.
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Old 11-28-2014, 07:27 PM   #41
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just purchased a non avcs jdmej205 jdmenginebay in hayward ca for $1200 out the door and its a pretty straight forward swapping of parts.

has anyone ran a non tgv jdm intake manifold with side feeds on a usdm car? if so any info on this?
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Old 12-19-2014, 04:37 PM   #42
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Please list the TURBO that came with your JDM engine AND IF YOU KNOW was it from an AT (flexplate) or Manual equipped WRX.

Thanks
Td
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Old 12-19-2014, 04:54 PM   #43
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Quote:
Originally Posted by Offroadguy View Post
I just put a JDM ej205 NON-AVCS into my 2002 WRX. It runs great, but needs a tune. The crank and cam gears have to be USDM to use US ecu, as the signals are different. My JDM engine has 9:1 compression instead of 8:1 this is the main reason for the tune. 91 octane will detonate if overboosted into this engine. The shop that will be tuning my car ran the code on the timing cover of the JDM engine and verified the 9:1 compression and told me what year and car it came out of. I kept the JDM turbo and pretty much changed everything else outside the longblock. I cleaned and reused the coolant/oil cooler, contamination is not an issue because the oil is filtered AFTER the cooler. Exhaust and intake manifolds are different. If anyone has questions, let me know.
Questions, please:
- What year is the engine? (I've read the JDM non-AVCS were plug-n-play on the cam/crank gears.)
- What turbo did it come with?
- How to ID the engine for compression? (If 9:1, it MUST have a re-tune.)
- Where'd you get the engine?
- Thanks
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Old 12-27-2014, 12:09 AM   #44
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Questions, please:
- What year is the engine? (I've read the JDM non-AVCS were plug-n-play on the cam/crank gears.)
- What turbo did it come with?
- How to ID the engine for compression? (If 9:1, it MUST have a re-tune.)
- Where'd you get the engine?
- Thanks[/quote]

Bump? Looking for these answers as well.
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Old 12-28-2014, 01:06 AM   #45
wtdash
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^^^Here's what I was told via email

Quote:
I think the engine is 2003, and the cam and crank gears had different shaped plates on the rear of them to send signals to the JDM ECU, so I had to change them.
I called a performance shop that is going to tune it for me and they ran the number off the timing cover tag of the JDM engine and were able to tell me the compression, year, model, said the hp was 240-250, but didn't mention the turbo. I took the tag off and lost it after the call, but the tuner said all we needed was the compression ratio. The turbo looked the same as the US turbo, but I'm not sure. I'll look for a number on it. Yes, they highly recommend a tune, but I have to diagnose a knock first. I hope it's the timing belt tensioner....

I bought the car from a neighbor, he had purchased an engine on ebay, here is the listing he forwarded to me.

http://www.ebay.com/itm/JDM-Subaru-I...L:COSI:US:1123

I think he got lucky as it is a non avcs.
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Old 01-06-2015, 02:46 PM   #46
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I'm going to be doing this swap over the next few days, I've got a friend who do it a few weeks ago. In order to get it to work, you have to swap the 4 cam gears, the crank gear, the sensors to usdm ones and the intake manifolds, as well as the headers. The engine I'm getting is out of a forester xt. I'll let you all know how it goes, I plan to have it started by Friday


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Old 01-07-2015, 12:24 AM   #47
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I have been looking at Jdm EJ205's and the only real difference I can see, externally anyway, are the newer motors have coil packs and the older ones have spark plugs. Can you run one of the older motors with coil pack setup, as long as, you are swapping the harness and everything to run US ecu?
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Old 01-08-2015, 05:59 PM   #48
wtdash
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BUMP for applicable JDM model years that will work in '02-'05 WRX.

From Wikipedia it's 1999+

Quote:
To identify an EJ205:

Coil on plug
idle air integrated into throttle body
Open deck block
Usage: Impreza WRX

99~01 (JDM Wagon Body only)
01~current (all JDM)including Forester Cross Sports and STI (9:1 compression ratio)
02~05 (USDM)
04~05 SAAB 9-2X AERO
99~current (all other markets)
So ANY '99+ will work? Some have the AVCS heads which can just be ignored (but you'll make less power) or add the AVCS wiring AND install a JDM AVCS-tuned ECU.


Other NASIOC EJ205 threads


List of JDM ECU 's (in Excel-CHECK THE TABS on the bottom for different markets), ECUTEK - Supported Vehicle List and a pic of a similar list in HERE.

Last edited by wtdash; 01-16-2015 at 11:10 PM.
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Old 01-10-2015, 02:05 PM   #49
Offroadguy
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Sorry for the delay, still new to this site.
The JDM engine had a flex-plate on it that bolted right up to my torque converter. Yes, mines an automatic
The turbo looks identical, so I used the JDM, waste gate and all.
The JDM intake manifold had no TGVS on it so I used the USDM one. I don't know how hard it would be to make the JDM intake work, it would flow much better for sure and the retune would be able to negate the DTCs being set.
I'm not sure what years of engines will work best.
You shouldn't have to change all the timing gears. I changed the crank gear and one cam gear, the ones with the sensors on them. I kept the JDM crank and cam sensors.
Got lucky, my engine knock was the timing belt tensioner rattling. I compressed the rod on the tensioner too fast and blew out the seal on it when I changed the timing components.
Here is a pic of the rear of the crank pullies, you can see the signal sent to the ecu is different.

http://i.imgur.com/SqWVWnr.jpg

Last edited by Offroadguy; 01-10-2015 at 06:40 PM. Reason: posting pic
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Old 01-13-2015, 09:24 PM   #50
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I can see TD40L on my JDM turbo installed in the car. I might be able to get more numbers if it helps.
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