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12-06-2020, 03:03 PM | #1 |
Scooby Newbie
Member#: 491511
Join Date: Sep 2018
Chapter/Region:
South East
Location: South Florida
Vehicle:2002 WRX Wagon Silver |
02 Wrx V7 Ej207 Swap Ecu Question
I'm planning on swapping a v7 207 into my 02 wagon. The engine in question would come with the ECU. My question is, and pardon my lack of knowledge, would I need to swap the whole wiring harness to get the engine running correctly? Or is it as simple as drop the engine in, plug the engine harness into the existing wiring harness, and just swap the ECU? Thanks in advance
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12-06-2020, 04:18 PM | #2 |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: So Cal
Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
Have you read over these two threads?
https://forums.nasioc.com/forums/sho...ighlight=ej207 https://forums.nasioc.com/forums/sho...ighlight=ej207 |
12-06-2020, 04:22 PM | #3 |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
You have some options on how you can set it up. You can use the USDM ECU but you won't have AVCS. The JDM ECU will allow you to use AVCS you just need to wire it in. You can buy a kit from either iA Tuning or iWire to do it the easy way or you can get the wiring diagram and wire it in yourself. Either way is fairly easy. It if you aren't comfortable following a wiring diagram then buy one of the kits so that it's mostly plug and play. Either way, you don't need to swap wiring harnesses. The engine will have the engine harness on it. All you have to do is plug everything in.
Depending on what state you live in you may need to keep the USDM ECU for inspection/emissions purposes. I have to for my state and just swap the USDM ECU in once a year to get the inspection done. |
12-06-2020, 06:05 PM | #4 | |
Scooby Newbie
Member#: 491511
Join Date: Sep 2018
Chapter/Region:
South East
Location: South Florida
Vehicle:2002 WRX Wagon Silver |
Quote:
Thanks for the info! So I could plug and play the 207 if I use the JDM ECU in conjunction with one of the kits is what I got from that. And if I needed to pass inspection, I just unplug the kit, swap the ecu, and the motor should still run correctly? |
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12-06-2020, 06:09 PM | #5 |
Scooby Guru
Member#: 50586
Join Date: Dec 2003
Chapter/Region:
BAIC
Location: Chiraq
Vehicle:64 Impala |
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12-06-2020, 06:21 PM | #6 |
Scooby Newbie
Member#: 491511
Join Date: Sep 2018
Chapter/Region:
South East
Location: South Florida
Vehicle:2002 WRX Wagon Silver |
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12-06-2020, 07:31 PM | #7 |
Scooby Guru
Member#: 50586
Join Date: Dec 2003
Chapter/Region:
BAIC
Location: Chiraq
Vehicle:64 Impala |
if you know how to use ecuflash and romraider you could flash a stock rom back to the usdm ecu...try checking out the romraider forums
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12-06-2020, 07:44 PM | #8 |
Scooby Newbie
Member#: 491511
Join Date: Sep 2018
Chapter/Region:
South East
Location: South Florida
Vehicle:2002 WRX Wagon Silver |
So I’ve been reading this thread
https://forums.nasioc.com/forums/sho....php?t=2285827 and it’s got me confused. They claim that if you have a USDM car, with the USDM wiring harness in the car, it is plug and play with the JDM ECU, no extraneous wiring or anything necessary. But others say you need the IA Tuning kit to wire in extra plugs for AVCS. But others say that as long as you just have the JDM ECU you get working AVCS without the IA Tuning kit??? Anyone know whats right? |
12-06-2020, 07:47 PM | #9 | |
Scooby Guru
Member#: 50586
Join Date: Dec 2003
Chapter/Region:
BAIC
Location: Chiraq
Vehicle:64 Impala |
There is 4 missing wires on the USDM cars that you need for AVCS, like the other have stated, you can 1)buy a wiring kit 2)make your own wiring 3)not install the wiring and not have AVCS. I can tell you from experience having AVCS makes a huge difference turbo spool especially on the twin scroll turbos.
Quote:
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12-06-2020, 08:04 PM | #10 | |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
02 Wrx V7 Ej207 Swap Ecu Question
Quote:
To use AVCS you need the JDM ECU and proper wiring. If done yourself it requires adding 4 wires plus a shield wired rom the ECU to the grey plug on the passenger side strut tower, re-pinning 4 wires on the ECU and re-pinning 4 wires on the black plug between the fuse box and battery. This allows you to repurpose the TGV wires to the AVCS. If you use a pre-made wiring kit, then it adds the wires you need to the engine harness and ECU without repurposing the TGV wires. AVCS will not work without adding in the proper wiring and ECU. Plain and simple. As for passing inspection and emissions, that depends on what state you live in. CA for instance, is going to be more of a process. But if you're fortunate enough to live in a state that just looks for readiness codes, then all you have to do is swap ECUs. No need to unplug the AVCS as the USDM ECU won't control it anyway. The important thing here is to make sure you have a proper tune to run the engine. Your tuner can take care of this and should know the ins and outs of one of these swaps. So if you haven't found a reputable tuner yet, then that's your next task and the most important thing to do at this point in the swap. Last edited by snow_bound26; 12-06-2020 at 08:09 PM. |
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12-06-2020, 08:25 PM | #11 | ||
Scooby Newbie
Member#: 491511
Join Date: Sep 2018
Chapter/Region:
South East
Location: South Florida
Vehicle:2002 WRX Wagon Silver |
Quote:
Quote:
Thank you both for the information! I think I know what to do now. Appreciate all the replies. |
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12-07-2020, 05:21 PM | #12 | |
Scooby Newbie
Member#: 520461
Join Date: Nov 2020
Location: Toronto
Vehicle:2004 WRX Silver |
Quote:
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12-07-2020, 06:57 PM | #13 | |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
Quote:
That's only an issue with 32bit ECUs. The 16bit ECU is just unplug and swap the other in. Having it tuned for injectors, airflow, etc is all that's needed. I have a very basic tune on my USDM ECU so it runs smooth and I can drive it to and from the shop. |
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