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Old 10-19-2009, 08:36 PM   #1
garface
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Default 02 WRX to JDM STi Ver. 7 engine. Do you need more than AVCS harness?

Someone just told me you need the engine harness too. I was under the impression that it is identical wiring except for the 8 or so extra wires for the AVCS. Any confirmation? This would be the EJ207 longblock and reuse all the stock 02 wiring with the originial intake mani, etc, then just add AVCS wires. Thanks for any help.
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Old 10-19-2009, 10:11 PM   #2
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I think I figured it out. You can use the 02 engine harness, but the AVCS wires just need to go straight to the ecu, correct?
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Old 10-19-2009, 11:23 PM   #3
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You need the JDM ECU obviously.

You then need the USDM stock wiring, left and right side of motor.

You then need the JDM engine hardness, that runs under the manifold, it has the connectors for the AVCS, etc.

You then need the IA Performance AVCS kit.

http://www.iaperformance.com/product...oducts_id=2580
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Old 10-19-2009, 11:55 PM   #4
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Originally Posted by garface View Post
I think I figured it out. You can use the 02 engine harness, but the AVCS wires just need to go straight to the ecu, correct?
That would work, but you would need the connectors to plug into the avcs solenoids and sensors and obviously the JDM ecu.
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Old 01-21-2010, 11:09 PM   #5
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So, to make sure I understand, I can use the US spec engine harness, as long as I have the connectors to plug in the AVCS solenoids and sensors that route to the JDM ecu?

Asking since the motor typically comes with a cut harness...
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Old 01-21-2010, 11:30 PM   #6
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So, to make sure I understand, I can use the US spec engine harness, as long as I have the connectors to plug in the AVCS solenoids and sensors that route to the JDM ecu?

Asking since the motor typically comes with a cut harness...
The engine should come with the harness that runs under the intake manifold. You need that, uncut.

You then use the existing usdm bulkhead harness, You have to move a few wires around in the connectors and add a few wires. It's not hard really. There are detailed instructions online and even kits with everything you need.
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Old 01-22-2010, 10:24 AM   #7
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Old 01-22-2010, 10:28 AM   #8
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Hehe, I actually made this post for you when you were interested in my engine.
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Old 01-23-2010, 02:43 PM   #9
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A jdm version 7 and 8 EJ207 is a direct bolt on into a USDM wrx. As long as you get a real complete motor kit and not a peiced together one. i.e. comes with complete motor, turbo kit, ECU, wiring harness, ect. And after that you can either send out your wiring harness' to get AVCS working to zeypher, ecs performance, and some other places OR you can just buy the IA performance AVCS wiring kit. I swapped my ver8 EJ207 into a 04 non turbo outback sport so my entire wiring harness was pulled and sent to zeypher in new jersey to get merged to the JDM ej207 harness and that included the AVCS obviously wired in also.

Good luck and let us know your progress on the build!
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Old 02-02-2010, 08:49 PM   #10
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Swap runs like a champ! I dropped in the entire V7 engine with all accessories as it came. The engine came with the passenger side harness to the ecu, so we disassembled it to get the AVCS wires out and plugged it into the US harness. No CELs!

Going from a VF22 WRX to the 207 with AVCS is a WORLD different! MUCH smoother, a TON more low end torque. The extra rpms really is nice too. I think it is probably making more power than my old setup.

Running the stock JDM ecu works perfect on 93 octane with no issues.
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Old 02-12-2010, 02:51 PM   #11
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does the usdm aftermarket exhaust bolt up to the jdm motors? I am thinking of getting a spec c ver 8 motor swapped in and I am afraid my turbo xs downpipe won't mate up. Thanks in advance for any help. sorry to thread jack, since you figured yours out thought I would piggyback.

Also do you need to run the avcs????

Last edited by subaruwrx0_0; 02-12-2010 at 03:18 PM.
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Old 02-12-2010, 03:16 PM   #12
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should mount right up unless you have a twinscroll setup
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Old 02-12-2010, 03:18 PM   #13
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which most likely it will come with, so would I need a jdm downpipe? or is there some sort of adapter
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Old 02-12-2010, 03:47 PM   #14
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Quote:
Originally Posted by subaruwrx0_0 View Post
does the usdm aftermarket exhaust bolt up to the jdm motors? I am thinking of getting a spec c ver 8 motor swapped in and I am afraid my turbo xs downpipe won't mate up. Thanks in advance for any help. sorry to thread jack, since you figured yours out thought I would piggyback.

Also do you need to run the avcs????
You need a JDM twinscroll downpipe for a V8 with a twinscroll turbo.

You don't have to run the avcs, it will run without it, but run much better with it. It's not hard to hook up, you need the jdm ecu and to add a few wires, there are kits available.
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Old 02-12-2010, 04:29 PM   #15
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Hey thanks for the responses...

My last question is, is it imperative to run 93 octane, me living on the west coast my options are limited to 91
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Old 02-12-2010, 07:01 PM   #16
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Quote:
Originally Posted by subaruwrx0_0 View Post
Hey thanks for the responses...

My last question is, is it imperative to run 93 octane, me living on the west coast my options are limited to 91
Nope just retune the jdm ecu to run on 91. Mostly lower the timing and you're good to go.

Don't try to run the stock V8 ecu tune on 91.
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Old 02-16-2010, 09:08 AM   #17
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Two questions:

Once the engine is running fine (I'm talking about V7 in 02 WRX), and AVCS is working, do you guys still see codes thrown by the JDM ECU, because of lack of rear differential temperature probe and other accessories that the V7 had?
Also, I've heard that some wires have to be moved inside the OBD2 connection, for the OBD2 to be able to talk to the state inspection machine, does anybody know if this is true?
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Old 02-17-2010, 08:23 AM   #18
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I did mine a few weeks ago and not one CEL. I think the rear diff temp may go strictly to the cluster, but I'm not sure.

Can't help on the OBD2 info - no inspections here in SC. No car I've owned in the past 10 years has even seen a cat.


Doesn't the JDM ecu have a knock sensor? If so, wouldn't it just pull a bit of timing if on 91? I'm running the stock jdm ecu on 93 with no issues. Japanese fuel is what, 94 octane? Do they really push them that far to the verge of detonation? What if you get a bad tank of 93?
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Old 03-03-2010, 12:27 AM   #19
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Due to this thread I have successfully swaped a V8 Spec C motor with the IA kit and passed smog, thanks everyone for the help and info
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Old 03-03-2010, 07:40 AM   #20
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Did you have to make any changes to the harness maybe by the OBD2 connector, in order to get the smog passed? (readiness test)

Last edited by Vlad; 03-03-2010 at 08:59 AM.
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Old 03-03-2010, 08:23 AM   #21
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because of lack of rear differential temperature probe and other accessories that the V7 had?
Ver. 7 doesn't have a rear diff temp sensor.
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Old 03-03-2010, 11:52 PM   #22
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Did you have to make any changes to the harness maybe by the OBD2 connector, in order to get the smog passed? (readiness test)

You have to make sure the jdm engine you receive has a complete engine harness. everything else is just plug and play, I have a 2002 wrx so I had to borrow a lot of my stock engine parts onto the spec c swap, since they changed the designs slightly over the years. No changes, newer jdm cars comes obdII ready. I did the complete swap in less than 8 hours by myself with help from a friend for like mounting the engine. I plugged everything in and it started first time around. Was pretty easy
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Old 03-04-2010, 07:36 AM   #23
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This sounds really great, the info I was looking for.
So you put the V8 engine to the 02 5 speed in the 02 WRX in 8 hours, added the AVCS harness, plugged in the V8 ECU and there it was, with no codes, running nice.
But the V8 spec C is twinscroll, no? and the JDM exhaust is separated in different length parts to begin with, I think.
So you must have had the downpipe, at a minimum.

Thanks again. And you also have nothing to worry about diff temp light, maybe not even the V8 has that sensor.
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Old 03-04-2010, 04:31 PM   #24
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No I did it like this, I pulled out my old motor, spent 3 days taking it apart, sent the heads to be inspected came back I cracked a valve port in cylinder 4, decided to buy a jdm motor, researched for a few days, ordered the AVCS wiring kit from IAPerformance, great kit btw, highly recommended.

Order the JDM Spec C motor from JDMRacingMotors here on the boards, from Wali great guy and fairly fast shipping, but I can understand it is winter time and the East is having a hectic time right now with the weather.

So I received the wiring kit and installed that first before and wired it up and double checked. I think it is easier to do this step prior to installing the new motor. You have to make sure the engine harness is complete so run through it. From my research having a turbo chassis is plug and play, my crate engine came with ecu harness but it was cut to ****.

So I installed the motor, put everything back in, I had to use my AC compressor and bracket from my 02 wrx motor, and also had to modify the power steering lines. Everything else was pretty much plug and play. The wiring harness I did correctly the first time around so I was lucky. The one thing I am going to do is install a cone filter because the power steering lines push the stock airbox, it barely fits. After that I plugged in the ecu and it started right up. I am going to work with Clark to remap my engine for 91 octane California gas.

Oh the JDM Downpipe is shorter than the USDM one, I had a TurboXS turbo back on my previous motor, but I need a twin scroll flange which I am also going to buy from IAPerformance. Luckily I had my stock exhaust still and installed the JDM DP, it was about 5 inches short to the intermediate pipe, so I cut it and welded in a pipe. Oh I forgot the one thing you have to do I borrow the O2 sensor from your USDM uppipe and plug it into the downpipe o2 sensor. Since US cars don't have a downpipe sensor, and have one on the uppipe and intermediate pipe instead.

Hope that covers everything.

Let me know you if you have any other questions
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Old 03-04-2010, 06:50 PM   #25
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this is really helpful, once motor arrives i will be doin this same swap (ver 7 into 02 WRX 5spd)

this thread should be stickied.. (that way i can find it again when i start asking a million questions )

you guys who already did this, anything you wish you would have done/added/replaced while motor was out?

i think i will skip tuning since there are 3 BP stations nearby that have 93 octane
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