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Old 04-03-2008, 05:54 PM   #1
Scooby Newbie
Member#: 176412
Join Date: Apr 2008
Default 04-05 STi Engine into an 05 WRX?

I have been searching and searching but still cant find all of the info i need. It have a good grip on the transmission/drivetrain options and issues. When it comes to the motor i understand it will pretty much bolt right in but what i am still not so sure on is the wiring.

I see a lot of people use the WRX wiring, intake manifold, throttle body, and ecu. There are a few things i dont like about doing that but it seems maybe its the best way.

What i was wondering is if you could use all of the STi parts including the ECU and wiring harness to essentially have a complete stock STi powertrain but in a WRX chassis. Then you could take advantage of the STi valve control system too. I am sure there is a reason people aren't doing it this way but i cant seem to find it. I bet the info is already here but i am having one hell of a time finding it.

If anyone could explain, or better yet, post up a link that would be great.


Last edited by rsmith2786; 04-04-2008 at 12:08 AM.
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Old 04-04-2008, 11:21 AM   #2
Scooby Newbie
Member#: 176541
Join Date: Apr 2008
Location: MO
2002 Impreza WRX


Are you wanting to do just the motor? No trans.. etc..
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Old 04-04-2008, 11:24 AM   #3
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Join Date: Apr 2008

I plan to do the whole powertrain but the tranny swap i have figured out.

I am basically wondering if i can use an STi ecu so that i am basically running a stock STi setup but in a wrx. Can i run the full STi harness, engine, and ecu or what needs to be done?
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