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JDM ECU? or USDM ECU? I NEED HELP!

   
Old 05-01-2013, 08:42 AM
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JDM ECU? or USDM ECU? I NEED HELP!
I'm currently installing a JDM EJ20 into my 2005 Subaru WRX.

My question is...Do I need to buy a JDM ECU? Or can I use the USDM ECU? If I do end up with the JDM ECU will it work with the harness and other assessories?

I need some gurus!

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Old 05-01-2013, 08:47 AM
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If you want to pass smog you'll need a USDM ECU.
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Old 05-01-2013, 09:06 AM
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The car will be registered in PA so I don't have to worry about smog
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Old 05-01-2013, 09:47 AM
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If you want the AVCS to work youll need the JDM ECU
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Old 05-01-2013, 10:00 AM
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He can splice in the avcs wires

Iag performance I believe sells a premade one.
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Old 05-01-2013, 10:39 AM
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JDM ECU if your engine has AVCS.

-- Ed
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Old 05-01-2013, 11:30 AM
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Originally Posted by MonsterGC
He can splice in the avcs wires

Iag performance I believe sells a premade one.
It's a chick lol. So. She.


Now awaiting for leg humpers.



Use the jdm ecu as I said on Facebook.
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Old 05-01-2013, 11:53 AM
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Originally Posted by Heedz
Now awaiting for leg humpers.




You called?
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Old 05-01-2013, 12:16 PM
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Originally Posted by joltdudeuc



You called?
Called?
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Old 05-01-2013, 12:25 PM
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JDM ECU is your only choice for AVCS.
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Old 05-01-2013, 12:45 PM
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Thanks guys and lmao heedz I didn't want them to know!
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Old 05-01-2013, 01:39 PM
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Which EJ20 are you putting in? EJ207 V7/V8?

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Old 05-01-2013, 01:40 PM
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If you need to "get by" the WRX ECU will run the engine, but as mentioned you really want the JDM ECU.

In my case, AVCS not working = 14psi @ 3900 RPM
AVCS working & tuned for = 14psi @ 3200 RPM

Needless to say, that makes a huge difference in drivability.
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Old 05-01-2013, 01:42 PM
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Originally Posted by Concillian
If you need to "get by" the WRX ECU will run the engine, but as mentioned you really want the JDM ECU.

In my case, AVCS not working = 14psi @ 3900 RPM
AVCS working & tuned for = 14psi @ 3200 RPM

Needless to say, that makes a huge difference in drivability.
Yep. And its not only spool, but even off boost response and drivability.

-- Ed
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Old 05-01-2013, 01:51 PM
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I can confirm this running an EJ257 long block without AVCS (all the sensors and feeds are there, just don't have the ECU, harness, pedals, or IM/TB). Driveability sucks.
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