Welcome to the North American Subaru Impreza Owners Club Friday March 29, 2024
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 03-20-2009, 06:52 PM   #1
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default need help for complicated swap

i'm merging my 2.5 rs wiring with the 04-05 usdm wrx wiring for my 97 ver. 4 jdm 2.0 motor to work. would i be needing any wires that go to the fender from the 04-05 wrx?

i am also merging the 04-05 wrx engine wiring to the jdm motor so that i can get it to pass emissions through the wrx ecu.

and would anyone know which wires i need to merge?
* Registered users of the site do not see these ads.
gc8v6 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 03-20-2009, 07:52 PM   #2
MasterKwan
Scooby Guru
 
Member#: 98961
Join Date: Oct 2005
Chapter/Region: MAIC
Location: NOVA
Vehicle:
2003 WRX
Black

Default

Wow, sounds tough. If you intend to use the WRX engine and ECU, I think you need the complete harness that runs under the left fender and through the firewall in front of the passenger seat (but, not under the right side fender). I assume you're using a late model engine harness too?

Have you thought about not bothering to merge but, to use an entire WRX harness? The emissions controls requires lines to the fuel tank and the evap tank under the car in the back.

Yeah, I'm thinking you want an entire WRX harness front to back and then you just tack on the parts you need for the RS. I'm sure you can do it the way you are. It just seems like more work. If you have a wrecked 04 parts car, why not swap everything over? That's what I did.
MasterKwan is offline   Reply With Quote
Old 03-21-2009, 09:39 PM   #3
Jaxx
Scooby Guru
 
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
Vehicle:
The 93 W/EJ20K-sold
Subaru-less :(

Default

this won't work
the cam pickup points are different on the v.4 and the cams are a different diameter (cam gears not interchangable with newer cam gears)

the crank wheel is also different but its easier to change
Jaxx is offline   Reply With Quote
Old 03-22-2009, 04:18 PM   #4
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

no i have a jdm ej20k complete motor not usdm motor..
gc8v6 is offline   Reply With Quote
Old 03-22-2009, 04:19 PM   #5
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

are you sure because i was told that doing this would work..
gc8v6 is offline   Reply With Quote
Old 03-22-2009, 04:49 PM   #6
Jaxx
Scooby Guru
 
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
Vehicle:
The 93 W/EJ20K-sold
Subaru-less :(

Default

by who

the only person i know who has made it work custom milled a newer cam pickup then welded it into the old cam gear
Jaxx is offline   Reply With Quote
Old 03-23-2009, 04:09 AM   #7
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

icic... well we'll see what happens lol
gc8v6 is offline   Reply With Quote
Old 03-23-2009, 04:14 AM   #8
darksc00by
Scooby Guru
 
Member#: 102140
Join Date: Dec 2005
Chapter/Region: South East
Location: Tampa Bae
Vehicle:
2016 Single Speed or
Death

Default

Just throwing it out there, maybe you should listen to Jaxx before you hack up a harness and find out it won't work... or sell the JDM motor and just get a USDM motor, they're better anyways unless you have an EJ207. (which you don't)
darksc00by is offline   Reply With Quote
Old 03-23-2009, 09:52 AM   #9
Brydon
Scooby Specialist
 
Member#: 107569
Join Date: Feb 2006
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
1998 Forester S
SRP

Default

Quote:
Originally Posted by Jaxx View Post
by who

the only person i know who has made it work custom milled a newer cam pickup then welded it into the old cam gear
I've done this a few times but the 05+ RS cam gear might also work. Never tried but it has the triggers and bolts up the same as the WRX. But one is SOHC and one is DOHC.
Brydon is offline   Reply With Quote
Old 03-23-2009, 11:46 AM   #10
Zephyr
Scooby Specialist
 
Member#: 3362
Join Date: Dec 2000
Location: Central NJ
Vehicle:
2001 I've wired a
Few cars in my day

Default

Your original question, Yes, you will need the front harnes, the section that goes through the drivers side fender.
Zephyr is offline   Reply With Quote
Old 03-25-2009, 03:09 PM   #11
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

would it work if i just took off the jdm engine harness and used the us 04-05 wrx intake manifold and us 04-05 wrx engine harness?
gc8v6 is offline   Reply With Quote
Old 03-25-2009, 06:23 PM   #12
johnny p
Scooby Newbie
 
Member#: 141232
Join Date: Feb 2007
Chapter/Region: NESIC
Location: wakefield,ma.
Vehicle:
02 v7sti wagon
signal green

Default

you will have to run a US WRX throttle body ,and as Jaxx said a cam gear that fits your cam with the WRX triggers. the crank trigger is different as well. turbomike as a thread about this.
johnny p is offline   Reply With Quote
Old 03-26-2009, 10:54 AM   #13
Jaxx
Scooby Guru
 
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
Vehicle:
The 93 W/EJ20K-sold
Subaru-less :(

Default

Quote:
Originally Posted by gc8v6 View Post
would it work if i just took off the jdm engine harness and used the us 04-05 wrx intake manifold and us 04-05 wrx engine harness?
no...

-->old heads (ej20g/h/k/r) will not work with newer ecus<-- ...
Jaxx is offline   Reply With Quote
Old 03-26-2009, 11:49 AM   #14
Zephyr
Scooby Specialist
 
Member#: 3362
Join Date: Dec 2000
Location: Central NJ
Vehicle:
2001 I've wired a
Few cars in my day

Default

You'll also need to change the timing gear on the crank as the old cars use a six tooth design.

Get a USDM motor, you'll save yourself a huge headache.
Zephyr is offline   Reply With Quote
Old 03-26-2009, 03:33 PM   #15
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

i would but this motor is fully built and came with a tranny only for 2grand and it has less than 20k on it. and it came with a lot of goodies such as: vf23, 850cc fuel injectors, stage 3 excedy clutch and 14lb flywheel and on top of it its fully built... i have a set of obx 04 wrx cams so that wouldnt be a problem switching out. and i really dont want to give up on this swap.
gc8v6 is offline   Reply With Quote
Old 03-26-2009, 04:06 PM   #16
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

Quote:
Originally Posted by johnny p View Post
you will have to run a US WRX throttle body ,and as Jaxx said a cam gear that fits your cam with the WRX triggers. the crank trigger is different as well. turbomike as a thread about this.

would i only need the us wrx throttle body? or would i "HAVE" to get the us wrx intake manifold as well?

Last edited by gc8v6; 03-26-2009 at 04:18 PM.
gc8v6 is offline   Reply With Quote
Old 03-26-2009, 08:33 PM   #17
jeffmoorman
Scooby Specialist
 
Member#: 105736
Join Date: Jan 2006
Chapter/Region: NWIC
Location: Portland, Oregon
Vehicle:
2011 135i
lemans blue

Default

if it were me, i would sell the motor and keep all the fun parts ( tranny, turbo, injectors, ect.) and pick up a usdm 2.0.

or i would hunt for the correct wiring harness for the motor. but you wont pass emissions.

good luck with the swap
jeffmoorman is offline   Reply With Quote
Old 03-26-2009, 08:50 PM   #18
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

Quote:
Originally Posted by gc8v6 View Post
would i only need the us wrx throttle body? or would i "HAVE" to get the us wrx intake manifold as well?
USDM WRX manifold has offset bolt pattern. EJ20K has inline bolt pattern. So, no you cannot use the EJ205 manifold on an Ej20K engine.

This swap isn't going to work the way that you are trying to do it.
Matt Monson is offline   Reply With Quote
Old 03-27-2009, 02:16 PM   #19
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

Quote:
Originally Posted by jeffmoorman View Post
if it were me, i would sell the motor and keep all the fun parts ( tranny, turbo, injectors, ect.) and pick up a usdm 2.0.

or i would hunt for the correct wiring harness for the motor. but you wont pass emissions.

good luck with the swap
yeah but i dont think the usdm wrx internals can handle the turbo with stock internals and i dont have time to do a rebuild.
gc8v6 is offline   Reply With Quote
Old 03-27-2009, 02:20 PM   #20
Rei_Akira
Scooby Scammer- Do Not Buy From User
 
Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

if you use the larger injectors and not running huge amounts of boost i doubt that the wrx internals would be destroyed.
Rei_Akira is offline   Reply With Quote
Old 03-27-2009, 02:35 PM   #21
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

Quote:
Originally Posted by Rei_Akira View Post
if you use the larger injectors and not running huge amounts of boost i doubt that the wrx internals would be destroyed.

how much is huge amounts of boost? because i think that the jdm turbo that i have is stock output is 18lbs
gc8v6 is offline   Reply With Quote
Old 03-27-2009, 02:44 PM   #22
Rei_Akira
Scooby Scammer- Do Not Buy From User
 
Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

hm, im dont know, ive heard of WRX motors being able to take that, as long as you have the fuel and tuning done.

im in the process of putting my EJ20K into my 97 coup, but im using a hybrid of the USDM and JDM engine harnesses.

im not sure what the stock boost is on those turbo's, i heard it was less, but could be wrong. are you using a wrx or sti k series?
Rei_Akira is offline   Reply With Quote
Old 03-27-2009, 02:48 PM   #23
gc8v6
Scooby Newbie
 
Member#: 173164
Join Date: Feb 2008
Chapter/Region: NWIC
Location: portland, oregon
Vehicle:
2013 STI Sedan LTD
SWP

Default

all i know is that its a jdm ej20k from a sti ver. 4 if that answers anything?
gc8v6 is offline   Reply With Quote
Old 03-27-2009, 03:59 PM   #24
Rei_Akira
Scooby Scammer- Do Not Buy From User
 
Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
Vehicle:
1997 GC8 coup
green

Default

im sure that some subaru guru will know what the factory boost is, or post the question in the pre-02 powertrain forum since it deals with the EJ20G and K

im hoping to have mine up by next week, so i'll know if i do.

but i know the WRX bottom end can handle 18psi if its tuned correctly.
there's a guy selling one locally tuned for 18psi with stock internals....
Rei_Akira is offline   Reply With Quote
Old 03-30-2009, 11:41 AM   #25
Zephyr
Scooby Specialist
 
Member#: 3362
Join Date: Dec 2000
Location: Central NJ
Vehicle:
2001 I've wired a
Few cars in my day

Default

I've been running a VF23 on my 02 USDM WRX swap for years now and have not had any issues. Aso running a dumb light Fidenza flywheel.

If you got a killer deal on it get the right engine management for it. I'm sure you can find the needed bits to run the stock ECU.
Zephyr 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
need help for rear diff swap gc8v6 Subaru Conversions 4 04-21-2009 03:25 PM
Need help for Turbo Swap pdpawd Alaskan Impreza Club Forum -- AKIC 20 06-13-2008 10:12 PM
Need help for JDM STi version 7 swap in 02 WRX mathroch Subaru Conversions 3 08-11-2006 10:14 AM
Need help for swap STI tranny 6spd on WRX 03 jpRACING Transmission (AT/MT) & Driveline 0 05-18-2006 12:11 PM
Need help for swapping interior? orwrx Interior & Exterior Modification 2 09-26-2005 12:21 PM

All times are GMT -4. The time now is 07:43 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.