JDM EJ20 Specs

wrxfactor · 04-06-2006, 10:39 PM

Hey guys, I'm having a JDM EJ20 (from an 05 WRX) swapped into my WRX after having an engine problem, and I'm just looking to get some specs on it.

I know it's still a 2.0L open deck, and makes 246chp instead of the 227chp out of the USDM. I believe redline is the same, but I'm unsure.

It also has AVCS heads, so I was wondering if it was worth it to get a JDM ECU or get a standalone down the road to support this.

I remember hearing something about a higher compression ratio, and was wondering what that would do for my numbers. I currently have a gutted stock UP, Bosal DP, and Bosal catback, and a TXS unichip that I will possibly be hooking up soon.

So anyone that has any true specs for this motor, post 'em here please

Thanks,
Chris

* Registered users of the site do not see these ads.

moss · 04-06-2006, 11:03 PM

It doesnt have a low compression ratio, it has a slighly high compression ratio. 9:1 . I have a MY02 JDM WRX EJ205. Your other specs are correct, though I was told 250chp. Redline is whatever the WRX is (7000-7200? Not sure I'm comming from a 2.5RS).

And yes AVCS heads. I got a JDM ECU with mine, so I'll be using it.

Keith

wrxfactor · 04-06-2006, 11:04 PM

Keith, just found out about the compression, and edited the post. Is it any more responsive to mods with the higher compression or no?

moss · 04-06-2006, 11:09 PM

Honestly. I'm not sure yet. My swap is still in the process of being finished (stupid wiring

)

I would think with the higher compression ir would allow the turbo to spool faster and require less boost. But I'm still a n00b to turbos and what not.

michaelpatrick · 04-12-2006, 02:06 PM

I though I had heard that the JDM ej20 has a redline of something like 8500, and that is why it is so appealing to us?

moss · 04-12-2006, 02:12 PM

the JDM EJ207s have better heads. Not the JDM EJ205s... read up.

wrxfactor · 04-12-2006, 04:06 PM

Quote:

Originally Posted by moss

the JDM EJ207s have better heads. Not the JDM EJ205s... read up.

Yuo, and the redline for the EJ207 is 8k rpm.

skiblur · 04-12-2006, 04:46 PM

ah, good call on the jdm wrx motor. I'm not sure why more people don't get them instead of rebuilding ej205's, considering the price that they go for. The compression is 9:1. They have cast or hypernautic pistons, not forged like the sti v7. I believe the pistons have the same construction as the JDM v8 sti. The heads have avcs, which means a jdm ecu controls them. AVCS is the shiz. You want it. Get a jdm ecu to run them. redline is 7200 on the motor. so you know, avcs will lower spool by 3-500 rpms when tuned. It is a solid motor, and a nice performance bump over the standard WRX motor. Great motor for the stg 4 guys. the comp ratio will be fun. Get a reflash for 93 octane and a vf series turbo and enjoy most of what the STi motor is, without the 8k redline.
Hope this answers some questions. I A performance sells a premade avcs harness. I wired my own and it took about an hour, and I'm not wiring savvy.
you could probably use a jdm sti ecu, somewhere could flash it for you.
good choice on the motor. you should be paying between 16-1900 max for the motor, with low milage.
If I can answer any other questions, let me know.
H.

petawabit · 04-12-2006, 04:52 PM

Quote:

Originally Posted by moss

Honestly. I'm not sure yet. My swap is still in the process of being finished (stupid wiring

)

I would think with the higher compression ir would allow the turbo to spool faster and require less boost. But I'm still a n00b to turbos and what not.

Hurry up! The higher compression is nice. the jdm ej205 is a beast

petawabit · 04-12-2006, 04:53 PM

Quote:

Originally Posted by moss

the JDM EJ207s have better heads. Not the JDM EJ205s... read up.

the jdm ej205 heads are still pretty big in terms of intake port. More so than the US sti

JRSCCivic98 · 04-12-2006, 07:00 PM

Quote:

Originally Posted by skiblur

I A performance sells a premade avcs harness.

Anymore info on this? I checked their site, but it looks like they are either redoing it or there's no info for anything on it. Anyway, do you happen to have a price or anything of that type of info?

moss · 04-12-2006, 07:06 PM

Quote:

Originally Posted by petawabit

the jdm ej205 heads are still pretty big in terms of intake port. More so than the US sti

REALLY? The older ones? the A type ? Production 8/00-9/01?

Super 16g here I come

keith

wrxfactor · 04-13-2006, 12:27 AM

Quote:

Originally Posted by JRSCCivic98

Anymore info on this? I checked their site, but it looks like they are either redoing it or there's no info for anything on it. Anyway, do you happen to have a price or anything of that type of info?

I googled and tried to click the link for them and it didn't work, but I clicked the "cached" link and it showed it for $150.00, but it's for a JDM ECU ALSO. As I'm using a USDM ECU, that might be a problem. I'll be contacting them soon though, and I'll let you guys know.

moss, question for you. I believe they are capping a hose or something to do with a coolant line in the rear of the motor near the flywheel. Is there any issue with this, or is it supposed to be hooked up somewhere?

nedalrabadi · 04-29-2011, 08:59 PM

what about the JDM EJ20X in the LEGACY 2.0 GT STI

Joshields54 · 03-26-2015, 08:05 PM

I know this is an old post but anyone know if the jdm ej205 comes with a slightly different turbo. Or is it exactly the same

jackassofalltrades · 03-28-2015, 12:14 AM

Same TD04-13T Turbo as the USDM.

JMlegacy · 03-28-2015, 03:14 PM

Quote:

Originally Posted by nedalrabadi

what about the JDM EJ20X in the LEGACY 2.0 GT STI

Your question is years old, but for those wondering, the EJ20x/EJ20y
has big port heads with quad avcs.

The bigger port in this pic is that of the Ej20Y. The other is the USDM STI 257

Buy the heads off a Ej20x if u get it for cheap, then slap on a build bottom end and make power. Rev to 7500, this is redline for ej20Y

bilbo93 · 10-18-2015, 05:21 AM

They actually come with a td04 HL turbo which is slightly bigger than the usdm models. Dont want anyone misinformed from previous posts.

OneManArmy · 12-11-2015, 11:04 PM

Are people not aware that all EJ205's are NOT AVCS?

bilbo93 · 12-13-2015, 11:18 AM

Quote:

Originally Posted by OneManArmy

Are people not aware that all EJ205's are NOT AVCS?

Jdm models came with single avcs

El Guapo · 12-13-2015, 11:40 AM

Quote:

Originally Posted by OneManArmy

Are people not aware that all EJ205's are NOT AVCS?

I think you are unaware that some JDM EJ205s have AVCS.

shortyhoward · 12-13-2015, 01:11 PM

Does anybody know if i can use a cobb access port with my jdm ej205, has usdm wiring harness

gnomesayng · 12-13-2015, 04:10 PM

As long as you are using a USDM ecu you can run the accesport. This would mean that you aren't running the avcs as JDM ecus or standalones are the only option for it. I dont think a JDM avcs ecu would be tunable with the AP, pretty sure you would need to find some specialty tuners to use opensource. Try and google "JDM subaru tuning"

madtrini · 12-13-2015, 11:32 PM

I'll chime in here.

I have a jdm avcs motor in my wagon. Got it cheap. Did not get an ecu, so i'm running the stocker.

I deleted AVCS by using the cam gears from my usdm motor. Valve covers are different. had to order the jdm valve cover gaskets. Turbo is the same td04-13t.

The water pump is also different. Used the USDM Kit and capped off the port going to the oil cooler. My motor does not have one.

I kept the jdm intake manifold, just had the car reflashed to ignore the tgv's that werent there anymore.

exhaust manifold is different too. kept the jdm unit.

power was identical to my stocker after getting it tuned. around 230 whp or so.

Subarujohnny · 01-06-2016, 04:58 PM

I have a JDM EJ205 with single avcs I imported through a ebay seller with less then 50xxx yada yada.... After contacting several tuners in California Including Cobb Tuning about using a Access Port for the motor, they highly recommended NOT running a Cobb Acess Port. They told me to run a opensource tune and get a base map off of a tuner (which i did through Torqued Performance) because of the difference in compression ratio and the new sensors involved in the avcs motor. The tuner recommended purchasing if i could a avcs harness and ecu to reap the benefit of the avcs which im in search of now.... I was able to install the motor WITHOUT swapping cam gears OR intake manifold like i had previously read in another thread, and run a usdm harness and ecu and it runs fantastic. I did the standard replacement of the timing belt, pulleys, water pump and thermostat. I have not got it on the dyno so as far of loss in power or gains I cannot tell. Hopefully i will have a response soon.....

04-06-2006, 10:39 PM	#1
wrxfactor Scooby Specialist Member#: 49978 Join Date: Dec 2003 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: 2002 WRX w/ JDM STi 6spd, EJ255, VF39 & EWG	JDM EJ20 Specs Hey guys, I'm having a JDM EJ20 (from an 05 WRX) swapped into my WRX after having an engine problem, and I'm just looking to get some specs on it. I know it's still a 2.0L open deck, and makes 246chp instead of the 227chp out of the USDM. I believe redline is the same, but I'm unsure. It also has AVCS heads, so I was wondering if it was worth it to get a JDM ECU or get a standalone down the road to support this. I remember hearing something about a higher compression ratio, and was wondering what that would do for my numbers. I currently have a gutted stock UP, Bosal DP, and Bosal catback, and a TXS unichip that I will possibly be hooking up soon. So anyone that has any true specs for this motor, post 'em here please Thanks, Chris * Registered users of the site do not see these ads. Last edited by wrxfactor; 04-06-2006 at 11:03 PM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Differences between JDM V9 STI, JDM V9 Spec-A/B/C, & JDM V8 Spec-C (Heads)???	nomorem3	Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)	16	04-06-2013 09:57 PM
domestic ej20 versus JDM ej20	subenick	Subaru Conversions	15	03-22-2004 07:00 PM
Differences between US EJ20 and JDM EJ20?	Lee Chun	Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)	3	01-03-2004 09:35 PM
Using a usdm ej20 block with jdm ej20 bottom end, whats the block diffrence with sti	Turbo Tin Can	Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)	2	12-02-2003 04:13 AM
Need JDM EJ20 Legacy Motor Specs from the past	MY99 2.5GT	Legacy Forum	4	05-09-2003 11:44 AM

04-06-2006, 11:03 PM	#2
moss Scooby Guru Member#: 10197 Join Date: Sep 2001 Chapter/Region: MAIC Location: Gtown, MD	It doesnt have a low compression ratio, it has a slighly high compression ratio. 9:1 . I have a MY02 JDM WRX EJ205. Your other specs are correct, though I was told 250chp. Redline is whatever the WRX is (7000-7200? Not sure I'm comming from a 2.5RS). And yes AVCS heads. I got a JDM ECU with mine, so I'll be using it. Keith

04-06-2006, 11:04 PM	#3
wrxfactor Scooby Specialist Member#: 49978 Join Date: Dec 2003 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: 2002 WRX w/ JDM STi 6spd, EJ255, VF39 & EWG	Keith, just found out about the compression, and edited the post. Is it any more responsive to mods with the higher compression or no?

04-06-2006, 11:09 PM	#4
moss Scooby Guru Member#: 10197 Join Date: Sep 2001 Chapter/Region: MAIC Location: Gtown, MD	Honestly. I'm not sure yet. My swap is still in the process of being finished (stupid wiring ) I would think with the higher compression ir would allow the turbo to spool faster and require less boost. But I'm still a n00b to turbos and what not.

04-12-2006, 02:06 PM	#5
michaelpatrick Scooby Newbie Member#: 101004 Join Date: Nov 2005 Chapter/Region: Tri-State Location: NJ Vehicle: 2002 WRX	I though I had heard that the JDM ej20 has a redline of something like 8500, and that is why it is so appealing to us?

04-12-2006, 02:12 PM	#6
moss Scooby Guru Member#: 10197 Join Date: Sep 2001 Chapter/Region: MAIC Location: Gtown, MD	the JDM EJ207s have better heads. Not the JDM EJ205s... read up.

04-12-2006, 04:46 PM	#8
skiblur Scooby Specialist Member#: 48291 Join Date: Nov 2003 Chapter/Region: MWSOC Location: Ann Arbor, MI Vehicle: 02 EJ207RA/JDM6 Still truckin'	ah, good call on the jdm wrx motor. I'm not sure why more people don't get them instead of rebuilding ej205's, considering the price that they go for. The compression is 9:1. They have cast or hypernautic pistons, not forged like the sti v7. I believe the pistons have the same construction as the JDM v8 sti. The heads have avcs, which means a jdm ecu controls them. AVCS is the shiz. You want it. Get a jdm ecu to run them. redline is 7200 on the motor. so you know, avcs will lower spool by 3-500 rpms when tuned. It is a solid motor, and a nice performance bump over the standard WRX motor. Great motor for the stg 4 guys. the comp ratio will be fun. Get a reflash for 93 octane and a vf series turbo and enjoy most of what the STi motor is, without the 8k redline. Hope this answers some questions. I A performance sells a premade avcs harness. I wired my own and it took about an hour, and I'm not wiring savvy. you could probably use a jdm sti ecu, somewhere could flash it for you. good choice on the motor. you should be paying between 16-1900 max for the motor, with low milage. If I can answer any other questions, let me know. H.

04-29-2011, 08:59 PM	#14
nedalrabadi Scooby Newbie Member#: 244358 Join Date: Apr 2010 Chapter/Region: International Location: JORDAN Vehicle: 1996 impreza orange & black	what about the JDM EJ20X in the LEGACY 2.0 GT STI

03-26-2015, 08:05 PM	#15
Joshields54 Scooby Newbie Member#: 411615 Join Date: Jan 2015	I know this is an old post but anyone know if the jdm ej205 comes with a slightly different turbo. Or is it exactly the same

03-28-2015, 12:14 AM	#16
jackassofalltrades Scooby Newbie Member#: 309550 Join Date: Feb 2012 Chapter/Region: MWSOC Location: Ohio Vehicle: UNIQ 15' WRX Limited Galaxy Blue Pearl	Same TD04-13T Turbo as the USDM.

10-18-2015, 05:21 AM	#18
bilbo93 Scooby Newbie Member#: 317073 Join Date: Apr 2012	They actually come with a td04 HL turbo which is slightly bigger than the usdm models. Dont want anyone misinformed from previous posts.

12-11-2015, 11:04 PM	#19
OneManArmy Scooby Specialist Member#: 36154 Join Date: May 2003 Location: Santa Cruz County Vehicle: 2004 WRX Wagon White	Are people not aware that all EJ205's are NOT AVCS?

12-13-2015, 01:11 PM	#22
shortyhoward Scooby Newbie Member#: 436055 Join Date: Dec 2015 Chapter/Region: E. Canada Location: New Brunswick Vehicle: 2004 wrx rally blue	Does anybody know if i can use a cobb access port with my jdm ej205, has usdm wiring harness

12-13-2015, 04:10 PM	#23
gnomesayng Scooby Newbie Member#: 407539 Join Date: Dec 2014 Chapter/Region: MWSOC Location: Chicagoland, IL Vehicle: 1998 SF5 EJ205 swap Black	As long as you are using a USDM ecu you can run the accesport. This would mean that you aren't running the avcs as JDM ecus or standalones are the only option for it. I dont think a JDM avcs ecu would be tunable with the AP, pretty sure you would need to find some specialty tuners to use opensource. Try and google "JDM subaru tuning"

12-13-2015, 11:32 PM	#24
madtrini Scooby Newbie Member#: 405053 Join Date: Oct 2014 Chapter/Region: TXIC Location: Houston/ College Station, TX Vehicle: 2002 wrx wagon faded silver crap	I'll chime in here. I have a jdm avcs motor in my wagon. Got it cheap. Did not get an ecu, so i'm running the stocker. I deleted AVCS by using the cam gears from my usdm motor. Valve covers are different. had to order the jdm valve cover gaskets. Turbo is the same td04-13t. The water pump is also different. Used the USDM Kit and capped off the port going to the oil cooler. My motor does not have one. I kept the jdm intake manifold, just had the car reflashed to ignore the tgv's that werent there anymore. exhaust manifold is different too. kept the jdm unit. power was identical to my stocker after getting it tuned. around 230 whp or so.

01-06-2016, 04:58 PM	#25
Subarujohnny Scooby Newbie Member#: 436694 Join Date: Dec 2015 Chapter/Region: BAIC Location: Santa Cruz CA Vehicle: 2002 WRX Aspen White	I have a JDM EJ205 with single avcs I imported through a ebay seller with less then 50xxx yada yada.... After contacting several tuners in California Including Cobb Tuning about using a Access Port for the motor, they highly recommended NOT running a Cobb Acess Port. They told me to run a opensource tune and get a base map off of a tuner (which i did through Torqued Performance) because of the difference in compression ratio and the new sensors involved in the avcs motor. The tuner recommended purchasing if i could a avcs harness and ecu to reap the benefit of the avcs which im in search of now.... I was able to install the motor WITHOUT swapping cam gears OR intake manifold like i had previously read in another thread, and run a usdm harness and ecu and it runs fantastic. I did the standard replacement of the timing belt, pulleys, water pump and thermostat. I have not got it on the dyno so as far of loss in power or gains I cannot tell. Hopefully i will have a response soon.....