Welcome to the North American Subaru Impreza Owners Club Saturday October 23, 2021
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Subaru Conversions

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 03-29-2007, 03:01 PM   #1
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default 2002 Subaru WRX to STi swap

Okay what all is involved in this swap. I know that motor mounts and trans are the same, but what else will just bolt up??

I have an 2002 WRX, and My buddy that works at a junkyard has a rolled over STi for me for pretty cheap too!!

Is it at all possible to simply swap the entire drivetrain, wiring harness and ECU, and just be done??

OR what else will I need to do?

Thanks ALOT!

-4thgenlude
* Registered users of the site do not see these ads.

Last edited by 4thgenlude; 03-29-2007 at 09:11 PM.
4thgenlude is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 03-29-2007, 03:07 PM   #2
anthonywrx
Scooby Specialist
 
Member#: 60276
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Elk Grove Village,IL
Vehicle:
2012 Chevy Malibu LT
03 WRX/STi hybrid sold :(

Default

i would do some serious searching on here, you can find most of your answers in previous threads about the similar setup. you'll be looking at a wiring harness to run the AVCS, along with some other random parts. a lot of people have done this, so don't give up. what year STi is it? overall it shouldn't be that bad, just a lot of time and effort

-Anthony
anthonywrx is offline   Reply With Quote
Old 03-29-2007, 05:03 PM   #3
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

Quote:
Originally Posted by anthonywrx View Post
i would do some serious searching on here, you can find most of your answers in previous threads about the similar setup. you'll be looking at a wiring harness to run the AVCS, along with some other random parts. a lot of people have done this, so don't give up. what year STi is it? overall it shouldn't be that bad, just a lot of time and effort

-Anthony
Thanks for the reply!

Its an 04 STi, If I simply remove the complete drivetrain with wiring harness and everything, I will still need to wire in stuff??
4thgenlude is offline   Reply With Quote
Old 03-29-2007, 05:13 PM   #4
anthonywrx
Scooby Specialist
 
Member#: 60276
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Elk Grove Village,IL
Vehicle:
2012 Chevy Malibu LT
03 WRX/STi hybrid sold :(

Default

Quote:
Originally Posted by 4thgenlude View Post
Thanks for the reply!

Its an 04 STi, If I simply remove the complete drivetrain with wiring harness and everything, I will still need to wire in stuff??
someone correct me if i'm wrong, but if you swap literally EVERYTHING into your car, including all the wiring harnesses, ecu, etc, you should be ok. again, i would still search to see if there is an easier.
anthonywrx is offline   Reply With Quote
Old 03-29-2007, 05:54 PM   #5
ImprezaWrx9
Scooby Newbie
 
Member#: 86938
Join Date: May 2005
Chapter/Region: MWSOC
Location: Mn
Vehicle:
2003 Impreza Wrx
WRB

Default

I was wondering the same question because i'm going to be doing the exact same thing to my car. I was wondering if everything in the picture besides the engine, tranny, and ecu is what is needed for the swap.



picture is from http://www.importtuner.com/tech/0311it_sti_conversion/
ImprezaWrx9 is offline   Reply With Quote
Old 03-29-2007, 06:12 PM   #6
eastcoastbumps
Scooby Guru
 
Member#: 29201
Join Date: Nov 2002
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
BMW M3
Honda S2000x2

Default

You do not need to swap the wiring harnesses if you are putting a JDM V7 into a bug-eye. They are plug and play, with the exception of AVCS. IA Performance sells an AVCS wiring kit for that swap.
eastcoastbumps is offline   Reply With Quote
Old 03-29-2007, 06:51 PM   #7
chinoWRXL
Scooby Newbie
 
Member#: 89123
Join Date: Jun 2005
Location: Colorado
Vehicle:
02 WdBody STi Wgn
03 L

Default

Quote:
Originally Posted by eastcoastbumps View Post
You do not need to swap the wiring harnesses if you are putting a JDM V7 into a bug-eye. They are plug and play, with the exception of AVCS. IA Performance sells an AVCS wiring kit for that swap.
If you have an USDM 04 sti as a donor, take the harness and the sensors, all the control units, everything you possibly can and that will reduce your wire splicing. Garage tuning will do just a harness although i dont know the details.

Also, take the gas tank.

I didnt see a shifter assembly in the pic either (although im gonna assume its with the tranny).

4thgen, you will need to wire headlights since your going 02-04. Get some JDMs though and youll be able to use the leveling switch.
chinoWRXL is offline   Reply With Quote
Old 03-29-2007, 08:22 PM   #8
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

okay pardon me for being a completle scooby noobie, but do subaru's only have 1 wiring harness? Or do they have a seperate harness for the engine, and body stuff?

If its just one harness, I might as well just use my stock wiring harness and then just add a few wires for the AVCS, does that sound right?

Last edited by 4thgenlude; 03-29-2007 at 08:45 PM.
4thgenlude is offline   Reply With Quote
Old 03-29-2007, 08:56 PM   #9
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

okay I searched around a bit for the AVCS harness on iaperformance . com but I couldnt find anything!

Does anyone have a link, or am I searching on the wrong site?
4thgenlude is offline   Reply With Quote
Old 03-30-2007, 01:08 PM   #10
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

okay so aparently the donor car is an 06 not an 04!

My buddy told me it was an 04, and when he finaly sent me some pics of it, it definitly has the new sexy front end.

Are there major differences going from an 02 wrx to 06 sti in terms of wiring?
4thgenlude is offline   Reply With Quote
Old 03-30-2007, 02:03 PM   #11
Carreragt2e
Scooby Specialist
 
Member#: 130877
Join Date: Nov 2006
Chapter/Region: MWSOC
Location: IL
Vehicle:
2013 Cayenne GTS
Black

Default

im curious, why swap the gas tank?
Carreragt2e is offline   Reply With Quote
Old 03-30-2007, 05:30 PM   #12
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

Quote:
Originally Posted by Carreragt2e View Post
im curious, why swap the gas tank?
I think I read somewhere that it has various sensors that arent on the regular gas tank, and its just easier to swap the whole assembly, rather than just the sensors themselves.

Im probably wrong though.
4thgenlude is offline   Reply With Quote
Old 03-30-2007, 06:20 PM   #13
eastcoastbumps
Scooby Guru
 
Member#: 29201
Join Date: Nov 2002
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
BMW M3
Honda S2000x2

Default

Quote:
Originally Posted by 4thgenlude View Post
okay pardon me for being a completle scooby noobie, but do subaru's only have 1 wiring harness? Or do they have a seperate harness for the engine, and body stuff?

If its just one harness, I might as well just use my stock wiring harness and then just add a few wires for the AVCS, does that sound right?
Subaru integrates the body and engine harnesses. Its not like a lot of other cars that have a completely independent engine harness. However there are connectors where the harness branches to the engine. These are only helpful when removing and reinstalling the same engine.

It will be far easier to swap everything from the STi if you get a hold of the complete car. Then you can use the entire STi harness, gas tank, dash, cluster, DCCD, climate control, cruise control, throttle by wire, etc. (They're all different.)

Like I mentioned earlier, swapping in a JDM V7 into a bug eye is plug and play and is far easier than a USDM STi swap. But if you have a lead on a complete USDM car, go for it.
eastcoastbumps is offline   Reply With Quote
Old 03-30-2007, 06:21 PM   #14
linus011
Scooby Specialist
 
Member#: 9132
Join Date: Aug 2001
Chapter/Region: MWSOC
Location: Chicago, Il
Vehicle:
2005 WRX STi
2009 Fit, 1972 Dart

Default

Don't forget the quicker steering rack. You'll have an annoying itch if you do!
linus011 is offline   Reply With Quote
Old 03-30-2007, 07:04 PM   #15
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

okay so if I just used the harness on the bugeye, what all would I need to wire in, to get everything working right?
Im assuming the AVCS, and DCDD, anything else?

The thing is I really do not want to tear the entire dash apart to get the whole harness out of my current car. Is it possible to just use the wiring harness in the bug eye and then simply swap ECU's and wire in the AVCS and DCDD?
4thgenlude is offline   Reply With Quote
Old 03-31-2007, 02:23 AM   #16
eastcoastbumps
Scooby Guru
 
Member#: 29201
Join Date: Nov 2002
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
BMW M3
Honda S2000x2

Default

Quote:
Originally Posted by 4thgenlude View Post
okay so if I just used the harness on the bugeye, what all would I need to wire in, to get everything working right?
Im assuming the AVCS, and DCDD, anything else?

The thing is I really do not want to tear the entire dash apart to get the whole harness out of my current car. Is it possible to just use the wiring harness in the bug eye and then simply swap ECU's and wire in the AVCS and DCDD?
The harnesses are completely different. Its not just a few accessories that you can drive the car without, like AVCS or DCCD. The throttle doesn't have a cable, (its fly by wire) so you have to swap in the STi gas pedal and wire that in. Cruise control will have to be wired in too. The STi ECU connector is a 4 plug, the WRX has a 5 plug. I'm not sure what else would have to be wired in, but its a lot of ****. Its easier to remove the STi harness and accessories and just swap everything. And then you'll have the cooler STi dash, cluster, and climate control...all with less work.
eastcoastbumps is offline   Reply With Quote
Old 03-31-2007, 05:15 PM   #17
4thgenlude
Scooby Newbie
 
Member#: 144777
Join Date: Mar 2007
Default

Quote:
Originally Posted by eastcoastbumps View Post
The harnesses are completely different. Its not just a few accessories that you can drive the car without, like AVCS or DCCD. The throttle doesn't have a cable, (its fly by wire) so you have to swap in the STi gas pedal and wire that in. Cruise control will have to be wired in too. The STi ECU connector is a 4 plug, the WRX has a 5 plug. I'm not sure what else would have to be wired in, but its a lot of ****. Its easier to remove the STi harness and accessories and just swap everything. And then you'll have the cooler STi dash, cluster, and climate control...all with less work.
thanks!

Thats what I needed to hear!
4thgenlude is offline   Reply With Quote
Old 04-01-2007, 03:17 PM   #18
ZPhreak
Scooby Newbie
 
Member#: 117009
Join Date: Jun 2006
Default California smog and JDM engines

wrong post
ZPhreak is offline   Reply With Quote
Old 04-01-2007, 05:11 PM   #19
wuuusaa
Scooby Guru
 
Member#: 92894
Join Date: Aug 2005
Chapter/Region: BAIC
Location: Lane splitting in Cali.
Vehicle:
2015 Wrx

Default

Quote:
Originally Posted by linus011 View Post
Don't forget the quicker steering rack. You'll have an annoying itch if you do!
I agree with you on this, b/c I have an 04 sti swap with the stock wrx steering rack and I drove my friends sti and it doesn't feel the same.
wuuusaa is offline   Reply With Quote
Old 04-17-2016, 04:05 PM   #20
wrxnutjob
Scooby Newbie
 
Member#: 444640
Join Date: Apr 2016
Default Harness?

Quote:
Originally Posted by 4thgenlude View Post
Okay what all is involved in this swap. I know that motor mounts and trans are the same, but what else will just bolt up??

I have an 2002 WRX, and My buddy that works at a junkyard has a rolled over STi for me for pretty cheap too!!

Is it at all possible to simply swap the entire drivetrain, wiring harness and ECU, and just be done??

OR what else will I need to do?

Thanks ALOT!

-4thgenlude
Which wiring harness you going to use?
wrxnutjob is offline   Reply With Quote
Old 04-18-2016, 02:18 PM   #21
hotdog
Scooby Specialist
 
Member#: 197520
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Columbus, OH
Vehicle:
2020 WRX STI
Magnetite Gray Metallic

Default

Nine years old, dude.
hotdog is offline   Reply With Quote
Old 02-08-2017, 10:58 PM   #22
rexspeeds
Scooby Newbie
 
Member#: 462581
Join Date: Feb 2017
Chapter/Region: W. Canada
Location: edmonton canada
Vehicle:
2002 wrx
silver

Default

I know this is a really old post but im kinda doing the same swap. I crashed my 02 rex and bought a 06 sti with no engine, still got the wiring harness and ecu and all the good stuff from the sti. So can i use the sti harness, ecu and just leave the stuff i dont need unplugged like avcs. Im going to do a dbw convirsion. And of corse get a tune.

Does that sound like its going to work?
rexspeeds is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2002 subaru wrx with v8 swap specchuck Private Vehicle 'For Sale' Classifieds 14 01-22-2008 12:10 PM
2002 subaru wrx w/sti driveterrian swap 70k miles very nice 6speed swap 10k miles on h_p Private Vehicle 'For Sale' Classifieds 8 06-06-2007 04:48 PM
2002 Subaru WRX with STI 6 Speed kayen Private Vehicle 'For Sale' Classifieds 22 03-08-2007 09:35 AM
FS-SC: 3" Vibrant Cat Back Exhaust 2002+ Subaru WRX and STi Sports Wagon Private 'For Sale' Classifieds 10 12-19-2004 05:42 PM
FS: 3" Vibrant Cat Back Exhaust 2002+ Subaru WRX and STi Sports Wagon South East Region Forum 9 12-18-2004 07:06 PM

All times are GMT -4. The time now is 06:39 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2021 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.