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Old 01-24-2013, 02:51 PM   #1
Scooby Newbie
Member#: 330913
Join Date: Sep 2012
Chapter/Region: NWIC
Location: Carnation, WA
2006 Subaru WRX

Default 06 STI motor swap into 06 WRX

Hello there! I am looking to swap an STI motor into my 06 WRX (preferably an 06 STI motor). Any information on how to preform this task would be helpful! Thanks!
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Old 01-24-2013, 03:22 PM   #2
Scooby Specialist
Member#: 259481
Join Date: Sep 2010
Chapter/Region: NESIC
Location: Boston, MA
2002 WRX STI Wagon


Should be a pretty straight swap since both are 2.5L and both are DBW.
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Old 06-17-2013, 01:47 PM   #3
Scooby Specialist
Member#: 110073
Join Date: Mar 2006
Chapter/Region: NESIC
Location: Rochester, NY

going to revive this thread instead of making a new one.

just got an 06 wrx with swapped 06 sti motor/drivetrain and the car does not idle. here is what I know:
2006 sti motor, all stock internals, has UP, DP, CAI
2006 wrx chassis, ECU, wiring harness, throttle body

has a stage 2ish tune with the wrx throttle body map

the car idles around 1800-2000rpm when started and will hunt 1200-2000 after driving and being in neutral at a light or whatever. I've checked the coolant temp sensor and tracked the car coming up to temp in romraider (so my assumption is that the sensor is working), I've checked the pedal angle % against the throttle plate position, also appears normal. I do have a small 2 pin connector on the engine wiring harness that is on the same branch as the throttle body and MAP sensor that is unplugged and I can't find anything on the STI engine that this should connect to (currently looking up wiring harness diagram to see what it *should* or shouldn't go to).

If somebody has done this swap successfully, can you help me nail down the idle/throttle issue, I'm not really looking to just start swapping parts until it's fixed. I have a new WRX throttle body and an STI one, will try those if need be. Looking at the tune, the maps for idle control look fine, I was lead to believe some that the coolant temp may be disfunctional since that is how the car is acting, looks like its sitting in the -40deg range of the coolant warm up.

car doesn't appear to have vac leaks and isn't acting like it does either
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