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Old 05-22-2013, 06:40 PM   #4
04wrx008
Scooby Newbie
 
Member#: 261447
Join Date: Oct 2010
Chapter/Region: NWIC
Location: Mt. Shasta
Vehicle:
2004 Impreza WRX
WRB

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short answer, which the 2 posts touched on prior is; yes.
The reason,
You have increased stroke, so timing is now changed slightly, you have also changed bore, so combustion has changed as well.
This results in the need for different fuel maps, as well as timing for a different motor.
with that said, yes you could run the motor with the ej205 ecu, but think about it. you just spent the time to put a new motor into your car, how awesome would it be to destroy because you didn't tune for it.
just another $0.02
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