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Old 02-01-2017, 02:03 PM   #1
Subie_Doo
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Default Running ej253 na-t with sti ecu.

Just wondering if this has been accomplished. I was trying to use tactrix and ecuflash to tune the na ecu but was having a hell of a time since there is very little support for the na ecu so looking at this route as an option.
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Old 02-06-2017, 08:05 PM   #2
RileyD
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STi ecu is looking for two cam sensors.
Your motor only has only cam sensor. That throws a little complication in this.
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Old 02-06-2017, 08:23 PM   #3
Dr.Subie
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It can be done, and it has been done numerous times before. The Ej253 MY2005 has the necessary cam sprockets and crank sprocket reluctor wheel to work with the 02-03 wrx ecu (not 110% sure on previous years, Subaru like to surprise us lol). Other things that will make the swap go smoother is a EJ205 IACV/throttle body and the MAP (only the map sensor is needed if you reflash with the Carberry ROM- strictly speed density...)

Goodluck with the swap, im glad to see someone else open source swapping a 253/251!!
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Old 02-06-2017, 08:26 PM   #4
Dr.Subie
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http://www.rs25.com/forums/f145/t120...p-n-wagon.html

Read through this thread, the OP "carbotron" goes through some detail on running his EJ253 on a 03 WRX USDM ECU.

Hope this points you in the right direction.
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Old 02-11-2017, 09:55 AM   #5
Subie_Doo
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Thanks for the replies.

Dr.Subie: i actually remember reading into that when i was gonna ecu swap my SF. Theres another thread thats more of a (diy:wrx ecu swap)how-to on rs25. Im not sure why but i totally forgot about it until you posted that link. Guess ill have to re-read it again

Just wondering if anyone knows if ill run into complications getting emissions done? Not really regarding the CEL but more if when they plug into the ecu and see that the ecu and car does not match up
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Old 02-11-2017, 09:58 AM   #6
Subie_Doo
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Also i think i wanted to go with the sti ecu vs the wrx because the 2.0 vs 2.5 but im thinking now it wont matter too much
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Old 02-11-2017, 10:02 AM   #7
Subie_Doo
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And one more thing. This is going into an 05 forester with dbw. I think most wrx/sti came with dbw in 04-05.
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