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Old 01-21-2015, 09:39 AM   #1
OC_Nooby
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Default EJ207 v8 Engine Harness to 2003 EJ205 Harness?

Hi guys,

I have a 2003 WRX with a EJ255 SB and EJ257 Heads. Now I'm changing the cams for ej207 avcs, ecu, and sensors.

Now assume this works but I need avcs. I know I can get an IA Performance wiring kit and wire AVCS in.

I was wondering though, if I can get a v8 EJ207 harness and connect it to my 2003 WRX usdm harness. I would then rewire the TGV to the AVCS. Is there anything else that would need to be done as far as pining goes?

Thanks
Ron
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Old 01-21-2015, 10:08 AM   #2
rdieder
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How many more of these threads are you going to start? Just stick with one.
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Old 01-21-2015, 12:44 PM   #3
OC_Nooby
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Instead of being a smart ass and not reading my threads. First thread regards putting cams in from a ej207 to a ej255. This thread is in regards to the wiring harness.

In order to keep the thread as simple as I could I asked certain question in one and certain in others.
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Old 01-21-2015, 01:24 PM   #4
dangerousatom
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The answer is in numerous spots on NASIOC . . . That being said you need to get those "Reporposed TGV wires" to the ECU. Via the passenger side engine to fender harness and the main engine bay hareness starting at the battery area black/brown connectors. IMO it's easyer to get shielded 2 wire and run the wires directly from the sensors to the ECU then repurposing the TGV wires.
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Old 01-21-2015, 01:32 PM   #5
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Quote:
Originally Posted by dangerousatom View Post
The answer is in numerous spots on NASIOC . . . That being said you need to get those "Reporposed TGV wires" to the ECU. Via the passenger side engine to fender harness and the main engine bay hareness starting at the battery area black/brown connectors. IMO it's easyer to get shielded 2 wire and run the wires directly from the sensors to the ECU then repurposing the TGV wires.
TGV wires are shielded from what I've heard, that's why you can use them.

Aside from that though, will the harness click together and does it need any other pin relocation?

I know what needs to be done to get avcs to work with my JDM ecu. i'm curious if the harness will connect and work without much modification (aside from the TGV wiring).
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Old 01-21-2015, 02:15 PM   #6
dangerousatom
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Harness are same/same with the AVCS wire addition on the JDM-STi harness

Do the 04^ AVCS cams work with the older JDM AVCS ECU. . . That's the question I have.

It be almost as easy to repin the throttle body plug wires from a 04^ STi engine harness for the EJ257 heads, everything else is the same, sept for the AC plug.
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Old 01-21-2015, 03:49 PM   #7
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"Harness are same/same with the AVCS wire addition on the JDM-STi harness "

That's what I wanted to hear.

04+ AVCS cams do not work with JDM ej207. The reason is due to the pickup on the cams. One is inverted while the other is ribbed/geared. Also the cam sensors are hall effect on the sti (3 wire) and magnetic on the ej207 (2 wire).

So the JDM EJ207 will work for me aside from repinning the TGV on the WRX harness, that's good to know. The STI harness is different (I compared them side by side a while back).

Thanks for the info.
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Old 01-21-2015, 08:19 PM   #8
Fierysun
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If you use the iap harness you won't need to rewire the tgv wiring. It uses the open/available slots in your existing ecu plugs.
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Old 01-21-2015, 09:30 PM   #9
dangerousatom
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Quote:
Originally Posted by Fierysun View Post
If you use the iap harness you won't need to rewire the tgv wiring. It uses the open/available slots in your existing ecu plugs.
Ya but it's like $199 & $299 for both the needed harnesses
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Old 01-21-2015, 10:16 PM   #10
Fierysun
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Quote:
Originally Posted by dangerousatom View Post
Ya but it's like $199 & $299 for both the needed harnesses
You only need the bulkhead one, unless you are missing the jdm under the intake manifold harness.
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Old 01-21-2015, 10:30 PM   #11
dangerousatom
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Quote:
Originally Posted by Fierysun View Post
You only need the bulkhead one, unless you are missing the jdm under the intake manifold harness.

Ya I understand that, I'm just saying i just bought all I need to make the harness including new AVCD & CAM plugs for under $75
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Old 01-22-2015, 01:26 AM   #12
Fierysun
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Quote:
Originally Posted by dangerousatom View Post
Ya I understand that, I'm just saying i just bought all I need to make the harness including new AVCD & CAM plugs for under $75
This is more involved and will require repositioning of pins on your factory harness, which isn't the easiest thing to do.
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Old 01-22-2015, 11:09 AM   #13
OC_Nooby
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My idea was to get the complete manifold, harness, etc. That way I don't have to deal with my TGVs, have more space under, looks cleaner etc.

That's why I wanted to make sure it would connect. I'm also thinking I either have a fuel rail issue or my current wrx engine harness is finiky. So this will help all around.

So If I have to repin a few wires, no biggie. Its winter time. I have plenty of time...
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