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Old 10-16-2011, 04:45 PM   #1
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default ej207 version 8 swap to an 05 wrx

I have an 05 wrx that I am soon going to swap a jdm ej207 version 8 drive train into. i have done many hours of research on this swap and found a lot of useful information. i am all set on the tranny swap. but have a few unanswered questions about the jdm sti v8 swap.

After my searching I heard that the swap is plug and play, but to get avcs to work, you must run the jdm ecu, which you need the jdm harness for. I have both of these but i have seen many people do the swap using the usdm harness. id rather not swap my body harness.

fist question: will the jdm ecu plug into my 05 usdm harness?
i know that the jdm harness has more wires for avcs, but are there any other differences? I'm pretty sure it will plug in but I've read that there is a difference with some of them.

second question: if the jdm ecu will plug into my usdm harness, i have read that i can take the extra wires for avcs out of the jdm harness and just put those in corresponding pins in the usdm harness hooked up to the jdm ecu. is this true? if so how many wires exactly do i switch over for avcs?

lastly i wanted to disassemble the motor and use all new gaskets and a timing belt. is the timing belt the same as the usdm 2.0? because i know the heads are slightly bigger. also what about valve cover seals? head gaskets? intake and exhaust manifold gaskets? i know the v8 ej207 has big port heads, so id imagine some of those gaskets would be different but I'm not sure.

Any help is much appreciated. I know there has been a number of people that have done these swaps, i just havnt come across anyone who has clearly answered these exact questions. i want to know how to do the swap from start to finish before i get into it so i am not with out my car for long.
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Old 10-16-2011, 05:38 PM   #2
jam007
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Member#: 174706
Join Date: Mar 2008
Chapter/Region: SCIC
Location: Camarillo, California
Vehicle:
2004 WRX V8 EJ207
6MT, 08 Spec B

Default

1). I have an 04 wrx and the bulkhead harness plugged right into the JDM ECU. I think the bugeyes have one less connector on the harness, but you should be fine.
2). I believe it was six wires three are shielded, I just purchased the IA Performance kit and wired it up myself really straight foward process it just entails putting them into the correct spots in the harness.
The timing belts are the same some of the gaskets not sure of valve cover is different, I think for the exhaust due to the twin scroll set up it may be different, but dont hold me to that.

Last edited by jam007; 10-16-2011 at 10:05 PM.
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Old 10-16-2011, 08:28 PM   #3
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default

oh that makes sense! thank you very much. when you say bulkhead harness i assume you mean the stock wrx harness? but yes i read that there was a difference with one harness being a 4 pin and one being the 5 pin. i think i was reading about a ej207 swap into a buy eye. thank you for the clarification! and i was looking on the IA performance site earlier and i saw that kit for $200. That is not a bad price to spend to make the ej207 swap work but i have heard people say it is very easy to make it work by using wires out of the jdm harness i got with the motor. if i can get away with out spending the extra money why not?

Has anyone else used the usdm harness to make avcs work with the jdm ecu by adding the needed wires and pins? and is there anyone else who knows what gaskets are different between the ej207 and ej205? thank you for the help.
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Old 10-16-2011, 10:06 PM   #4
jam007
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Member#: 174706
Join Date: Mar 2008
Chapter/Region: SCIC
Location: Camarillo, California
Vehicle:
2004 WRX V8 EJ207
6MT, 08 Spec B

Default

Yea usdm harness, you need the wires from the JDM harness or the IA kit due to the shielded wire cause the avcs signal is magnetic pickup or some ****, you want the avcs funtional on this motor it is pretty awesome. For any other inquires you should check out the EJ207 owners thread in the 2.0ltr forum lots of helpful info there.
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Old 10-16-2011, 10:27 PM   #5
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default

ok thank you for the help and that is a good idea. i will check that out. and yes when i heard people talking about swapping the body harness, i considered just using the ej207 block and selling the avcs heads. but everyone says for the full effect your going to want those avcs heads hooked up. how do you like your set up? and do you have any other advice that might be helpful? its good to be able to talk to someone who has already done the swap.
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Old 10-17-2011, 03:08 PM   #6
jam007
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Member#: 174706
Join Date: Mar 2008
Chapter/Region: SCIC
Location: Camarillo, California
Vehicle:
2004 WRX V8 EJ207
6MT, 08 Spec B

Default

The best advice I can give you is take your time and make a day to day schedule or goals that you would like to get done with this swap if you dont you may miss something. I myself love the OEM look so I was pretty careful and took pictures on how everything was ran. This motor is awesome upon start up you will imediately know that this thing is night and day from any stock 205 and 257 by the idle. It is so smooth and barely into the throttle you can feel this thing just wanting more, keep the AVCS heads getting them to work is cake.The kit from IA Performance is REALLY basic and it talks about a couple of things to look at before start up in the instructions ie the IAT sensor in the intake manifold and what not. Stephen from IA can also walk you through some of the questions you may have. Good luck with the swap.
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Old 10-17-2011, 07:04 PM   #7
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default

isn't the IAT sensor in the intake manifold just a small 2 wire harness you have to unplug for something? but i swapped my ej205 with another ej205 when i bought my car because i bought it with a spun bearing. so this is not my first swap. and there shouldn't be too many differences so i should know how to do this swap. i feel pretty comfortable doing it. all i need to do is plug up those extra 6 or so wires for the avcs to work.

i did some research on the model number of the ecu given to me with my motor and i found that it is for a usdm bug eye with the 4 pin harness, which obviously does not support avcs. i believe this is because the guy i bought it from was going to swap it into an older legacy which probably also had the 4 pin ecu. so he probably just wanted a harness that would plug in for a 2.0 and he probably wasn't going to run avcs. long story short, if i want my avcs to work, looks like I'm going to have to look into finding a jdm v8 ecu so it will plug into my 05 wrx and so my avcs to work... any advice anyone has I would love to hear.
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Old 10-18-2011, 06:12 PM   #8
crex11
Scooby Newbie
 
Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default


Last edited by crex11; 10-18-2011 at 06:23 PM. Reason: wrong image
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Old 10-18-2011, 06:14 PM   #9
crex11
Scooby Newbie
 
Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default


Last edited by crex11; 10-18-2011 at 06:16 PM. Reason: wrong image
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Old 10-22-2011, 06:24 PM   #10
AlexTRD
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Member#: 135627
Join Date: Dec 2006
Chapter/Region: SWIC
Location: Peoria, AZ
Vehicle:
2005 WRX td06-20g
WRB v8 ej207/C32 AMG

Default

If you have the jdm ecu it's pretty much plug and play into your usdm wrx harness, with the exception of some repinning needed for the avcs. I didn't feel the need to waste the money on the IA kit and just pulled the shielded avcs wiring out of the jdm body harness I had. You can hijack the tgv solenoid wiring to run the avcs solenoids, but you'll need to add the shielded wire for the avcs sensors. The specifics are all on here somewhere, pm me if u need help I have the jdm wiring diagrams. Also if you keep your 5 speed from the 05, you'll need to disconnect your nuetral safety switch for the avcs to work, as the polarity is reversed from the jdm 6 speeds (or snag a nss from a bugeye). As someone else said, the IAT sensor by the throttle body needs to be disconnected too.
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