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Old 08-30-2012, 12:35 AM   #1
tomcat7810
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Member#: 194056
Join Date: Nov 2008
Chapter/Region: MAIC
Vehicle:
07 Sti
Swp

Default wrx swap ?

Ok I have been searching for hours and cant find my answer. I have been looking at a swap for my 03 wrx. I am stuck between the jdm v7 sti motor and a usdm 05 sti motor. both swaps would come with the complete motor(turbo, manifold, etc) and ecu and engine harness. Now i know that the jdm v7 swap requires the avcs harness adapter and to run the jdm ecu. I also know it will be a pain to do emissions due to the fact that I would have to swap to a flashed U.S. ecu to pass. SO my question is what are the complications with dropping in a usdm sti engine? I want to be able to pass emissions with no problem and run an accessport because my tuner is most comfortable with that. Some One please help because I have been searching my brains out.
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Old 08-30-2012, 01:53 AM   #2
recce02
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Member#: 13815
Join Date: Jan 2002
Chapter/Region: SCIC
Location: Good ol Temecula
Vehicle:
02 GCRally prepped
277TQ 281HP 19PSI

Default

Look into your local emissions laws. Out here in CA we are allowed to update and go to a "referee" to be inspected and pass. Once passed we are registered as having "proper" updated engines and drive trains. So I would say based on what the laws are is what my decision would be.
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Old 08-30-2012, 02:56 AM   #3
tomcat7810
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07 Sti
Swp

Default

I am not sure where to look, but on the many threads that I seen people in md with the swap were changing to the stock wrx ecu with a flash to pass and then switching back to the jdm ecu. Does the usdm engine drop right in and work with everything? Like if I or a 05 sti engine with its ecu and engine harness would it bolt right up and work? Or would I have to do some special things? I know with a usdm ecu Cobb will work.
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Old 08-30-2012, 09:13 AM   #4
davidmount
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Member#: 173026
Join Date: Feb 2008
Chapter/Region: SCIC
Location: Oceanside, CA
Vehicle:
2003 WRX
WRB

Default

recce02 I see you have an 02 Subaru. I have an 03 WRX, but I thought I would have to use a JDM version 8 engine since you can't put in an engine older than your model year - I have a friend that is a smog tech - which would mean no JDM version 7. Also by update, did you mean updating the ECU? I'd heard you had to reflash because of the differences in fuel quality - didn't realize that until I started thinking about doing an engine swap. I'd rather drop in a JDM engine and tranny, but good ol CARB is putting a damper on things - not worth fighting with my Subaru service advisor wife about the things that go into my WRX.
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Old 08-31-2012, 12:40 AM   #5
recce02
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Member#: 13815
Join Date: Jan 2002
Chapter/Region: SCIC
Location: Good ol Temecula
Vehicle:
02 GCRally prepped
277TQ 281HP 19PSI

Default

Quote:
Originally Posted by davidmount
recce02 I see you have an 02 Subaru. I have an 03 WRX, but I thought I would have to use a JDM version 8 engine since you can't put in an engine older than your model year - I have a friend that is a smog tech - which would mean no JDM version 7. Also by update, did you mean updating the ECU? I'd heard you had to reflash because of the differences in fuel quality - didn't realize that until I started thinking about doing an engine swap. I'd rather drop in a JDM engine and tranny, but good ol CARB is putting a damper on things - not worth fighting with my Subaru service advisor wife about the things that go into my WRX.
O I hear that! Such a pita to swap. My next engine build will be a forged stroked 2.0L. Instead of JDM, why not just update to usdm 2.5 torque? It'll be easier in the end with all the CARB crap we have to deal with.
By update, newer year model engine.
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Old 08-31-2012, 12:43 AM   #6
recce02
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Member#: 13815
Join Date: Jan 2002
Chapter/Region: SCIC
Location: Good ol Temecula
Vehicle:
02 GCRally prepped
277TQ 281HP 19PSI

Default

Quote:
Originally Posted by tomcat7810
I am not sure where to look, but on the many threads that I seen people in md with the swap were changing to the stock wrx ecu with a flash to pass and then switching back to the jdm ecu. Does the usdm engine drop right in and work with everything? Like if I or a 05 sti engine with its ecu and engine harness would it bolt right up and work? Or would I have to do some special things? I know with a usdm ecu Cobb will work.
If everything comes with 05 swap just do that. Then you don't have to source out ECU and whatnot.
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