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Old 03-15-2006, 01:23 PM   #1
Scooby Specialist
Member#: 108144
Join Date: Feb 2006
Chapter/Region: South East
Location: Knoxvegas
04 Forester XT

Default Full STi engine swap into WRX

I've got an '02 that I am getting ready to rebuild. My options are 2.5L shortblock with stock heads and the VF34 that is currently on the car.....or full Sti motor swap. Money doesn't matter because they are going to be the same cost to me.

Basically heres my question can I use my WRX ECU w/ UTEC on teh STi motor or will I need to do a full ECU swap as well?


ps yes Ive searched (I hate the search engine here)
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Old 03-15-2006, 09:15 PM   #2
Element Tuning
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
673 WHP Element
Tuning Pro Comp Engine


This should help get you started:


Good luck.
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Old 03-15-2006, 10:10 PM   #3
Scooby Specialist
Member#: 8356
Join Date: Jul 2001
Chapter/Region: MAIC
02 STi swap
12 WRX limited


yeah you can get by w/ your wrx ecu and utec. I ran mine that way for a while, but you will be missing out on the magic that avcs provides!
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Old 03-16-2006, 01:55 PM   #4
Scooby Specialist
Member#: 94494
Join Date: Aug 2005
Chapter/Region: NWIC
Location: Seattle
2005 Element 92x


Yes. The AVCS makes a big diff. I'm doing the same swap and I'm selling my UTEC for a Hydra for the AVCS control. If you're not willing to get a STI ECU with a STI UTEC, get a Hydra, or just get the STI block and put different cams in your WRX heads.
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