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Old 08-25-2008, 06:31 PM   #1
jetskibucky
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Default WRX to STI, engine and driveline swap

How much work is it to swap the stock 2003 WRX engine, trans, and ecu with that of a 2007? Is it possible? Anyone who has done, I would appreciate feedback
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Old 08-25-2008, 06:35 PM   #2
Jaxx
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you have to swap the complete bulkhead harness (every thing behind the dash)
and have a working key for the imobilizer
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Old 08-25-2008, 06:40 PM   #3
Airborne_J
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I've heard of it being done in a weekend if you've got the wiring harness dissected.

The wiring is the most difficult part of the whole project, but if you know your stuff it's just time consuming.

I'm in the middle of a '01 to '04 STi swap and the wiring is beyond a doubt the most nerve racking part of the whole thing. We've done about 2 weekends worth of work (the first was to strip the car/pull engine/trans etc and the second was to start on the wiring) and the whole project is about 50% done but we're definitely taking our time.
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Old 08-25-2008, 06:44 PM   #4
jetskibucky
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Quote:
Originally Posted by Jaxx View Post
you have to swap the complete bulkhead harness (every thing behind the dash)
and have a working key for the imobilizer
This must be crazy work. I thought it might be a bit easy.
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Old 08-25-2008, 06:45 PM   #5
jetskibucky
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Quote:
Originally Posted by Airborne_J View Post
I've heard of it being done in a weekend if you've got the wiring harness dissected.

The wiring is the most difficult part of the whole project, but if you know your stuff it's just time consuming.

I'm in the middle of a '01 to '04 STi swap and the wiring is beyond a doubt the most nerve racking part of the whole thing. We've done about 2 weekends worth of work (the first was to strip the car/pull engine/trans etc and the second was to start on the wiring) and the whole project is about 50% done but we're definitely taking our time.
What if I get the bulkhead harness like listed above? Easier, or more hassle to change it?
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Old 08-25-2008, 06:50 PM   #6
Airborne_J
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There are something like 5 sub-harnesses (the bulkhead being one of them) on the STi so if you have limited experience with wiring and electronics I would recommend buying the 07 bulkhead/engine/instrument cluster wiring harnesses and going from there. You'll still need to know what you can remove and what you need to keep but at least you'll have everything you need and it will be much easier.



The white piece you see there is FILLED with wires going through the dash/firewall/ECU and weighs about 25 lbs!

If you're at all put off by the idea I would probably recommend not doing it yourself. I don't know much about your experience working on cars though so I can't say for sure.


Quote:
Originally Posted by jetskibucky View Post
What if I get the bulkhead harness like listed above? Easier, or more hassle to change it?
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Old 08-26-2008, 12:42 AM   #7
BlackFlame
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I too am planning and organizing my swap things this winter. I have an 07 STI complete dash harness with ECU and Immobilizer box as well as an 07 STI engine harness.

What other pieces will I need to get the dash all setup and the car totally functioning (without splicing any harness' -as i dont plan to)?

Also, BTW its going into an 06 base 2.5i/rs that is already DBW.

My list/thoughts so far.
-STI Gauge Cluster
-Auto-HVAC Face Control/Console
-Auto-HVAC Heater Box
-Do I need an STI steering column ?
-Are there extra sensors to worry about in the dash for Auto-HVAC?

Glad I came across this thread...lookin forward to input
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Old 08-26-2008, 07:15 PM   #8
ciper
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When was CAN introduced, 2007 or 2008?

One of them also requires the gauge cluster which means dash swap, which means firewall and support brace modification. If your's is the effected year the cluster has to be from the matching vehicle IIRC.
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Old 08-27-2008, 12:33 AM   #9
2ndGearFling
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Dont forget that with the STI transmission, you'll need STI half shafts, drive shaft, knuckles, hubs, brakes, trans mount, rotors and possibly bigger wheels.
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Old 08-27-2008, 11:50 PM   #10
BlackFlame
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Quote:
Originally Posted by ciper View Post
When was CAN introduced, 2007 or 2008?

One of them also requires the gauge cluster which means dash swap, which means firewall and support brace modification. If your's is the effected year the cluster has to be from the matching vehicle IIRC.
I think it was 2008...for the auto-hvac swap into an 06 2.5i from an 06/07 sti the dash brace does have to be modified ?
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Old 08-28-2008, 03:36 AM   #11
bugeye-brawler
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wrinkleboi
search him there's all your answers to do a full swap with ECU and everything is too hard i mean you could but its not worth it

this dude put a whole 07 STi into his 03 WRX i mean everything including ECU and all the harnesses AVCS is going an all without any CELs or stand alones IT IS AN 07 STi! nothing bugeye about it except the frame!

but its way hard look at his thread pm him see if he's busy but you're talking about a huge project

on the swap i'm planning on my 02 (to an 05+ STi) all i'm doing is the engine and tranny and the suspension and brake goodies leave the ECU unless you have the mods swapped in and you you want more power and you have like two weeks free... and then it might be worth look for that guy first he's got the answers... he told me by doing it this way you do 60 percent of the work for 90 percent of the power the rest can be made up by catless dp and up pipe and other mods to your turbo like wastegate and other stuff.

Last edited by bugeye-brawler; 08-28-2008 at 03:40 AM. Reason: more info
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