Welcome to the North American Subaru Impreza Owners Club Thursday July 31, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 06-07-2010, 06:29 PM   #1
V8Nate
Scooby Newbie
 
Member#: 215703
Join Date: Jun 2009
Chapter/Region: NWIC
Location: McChord AFB, WA
Vehicle:
2003 WRX
WRB

Default 04 sti longblock in 03 WRX no AVCS

I have a 04 STI longblock that I was going to use to build a hybrid but now I am confused. Can I use the STI longblock with my wrx manifold, tgv's, and throttle body and just not hook up the AVCS and it will work or will I still need to convert the ECU and harnesses or do something else to get it to work. I tried to search for it but everything I found was for keeping the AVCS.
* Registered users of the site do not see these ads.
V8Nate is offline   Reply With Quote
Old 06-07-2010, 08:07 PM   #2
dangerousatom
Scooby Specialist
 
Member#: 70710
Join Date: Sep 2004
Chapter/Region: Tri-State
Location: Quakertown/AREA1320 391whp
Vehicle:
2002 04STi Swaped RS
w/PPGS & 02 Wagon w/PPGs

Default

Yes it all bolts up ( physically ) more or less.

The AVCS will not function unless you wire it in and have the STi ECU. If you dont the AVCS will fall to "default position" and be basically inactive. I have spoken to numerous Suby techs about this and their theory has varied in all their explanations....some say low cam position is default others mid and others have no idea. Either way it will run just not as well as active.

I assume you know you will need a re-tune no matter what due to different compression ratio and .5L increase in displacement.
dangerousatom is offline   Reply With Quote
Old 06-07-2010, 08:21 PM   #3
V8Nate
Scooby Newbie
 
Member#: 215703
Join Date: Jun 2009
Chapter/Region: NWIC
Location: McChord AFB, WA
Vehicle:
2003 WRX
WRB

Default

I understand I will need the re-tune which is fine because right now I am running the cobb ap and I am looking to get rid of it. I've been doing some more research and now im trying to figure out if I should use the avcs cam gears or use the wrx non avcs cam gears and plug up the holes in the cams.
V8Nate is offline   Reply With Quote
Old 06-09-2010, 12:30 PM   #4
sense of nature
Scooby Guru
 
Member#: 112759
Join Date: Apr 2006
Chapter/Region: MWSOC
Location: In the V hole!
Vehicle:
?? pending....
sale....

Default

Quote:
Originally Posted by V8Nate View Post
I understand I will need the re-tune which is fine because right now I am running the cobb ap and I am looking to get rid of it. I've been doing some more research and now im trying to figure out if I should use the avcs cam gears or use the wrx non avcs cam gears and plug up the holes in the cams.
I would plug the holes & run the Wrx cam gears .. they are lighter .. less rotating mass
sense of nature is offline   Reply With Quote
Old 06-09-2010, 04:49 PM   #5
V8Nate
Scooby Newbie
 
Member#: 215703
Join Date: Jun 2009
Chapter/Region: NWIC
Location: McChord AFB, WA
Vehicle:
2003 WRX
WRB

Default

Makes sense. I think ill be doing that unless I decide to run the WRX heads and then ill be throwing the STI cams in them.
V8Nate is offline   Reply With Quote
Old 06-09-2010, 11:19 PM   #6
sense of nature
Scooby Guru
 
Member#: 112759
Join Date: Apr 2006
Chapter/Region: MWSOC
Location: In the V hole!
Vehicle:
?? pending....
sale....

Default

Quote:
Originally Posted by V8Nate View Post
Makes sense. I think ill be doing that unless I decide to run the WRX heads and then ill be throwing the STI cams in them.
You would still need to plug the holes
sense of nature is offline   Reply With Quote
Old 06-09-2010, 11:32 PM   #7
V8Nate
Scooby Newbie
 
Member#: 215703
Join Date: Jun 2009
Chapter/Region: NWIC
Location: McChord AFB, WA
Vehicle:
2003 WRX
WRB

Default

Quote:
Originally Posted by sense of nature View Post
You would still need to plug the holes
Yeah, I know I will need to either way. Just trying to figure out which will perform better. I can't find much on comparison between a hybrid and the sti longblock without running AVCS
V8Nate is offline   Reply With Quote
Old 06-09-2010, 11:50 PM   #8
dangerousatom
Scooby Specialist
 
Member#: 70710
Join Date: Sep 2004
Chapter/Region: Tri-State
Location: Quakertown/AREA1320 391whp
Vehicle:
2002 04STi Swaped RS
w/PPGS & 02 Wagon w/PPGs

Default

call www.metricmotorsxtreme.com in they make sand rails out of suby motors. The tech guy I spoke to is a suby genius to say the least. He gave me excellent advice and insight on my Legacy 2.2 turbo build with 2.5i SOHC heads.
dangerousatom is offline   Reply With Quote
Old 06-11-2010, 05:09 PM   #9
sense of nature
Scooby Guru
 
Member#: 112759
Join Date: Apr 2006
Chapter/Region: MWSOC
Location: In the V hole!
Vehicle:
?? pending....
sale....

Default

Quote:
Originally Posted by V8Nate View Post
Yeah, I know I will need to either way. Just trying to figure out which will perform better. I can't find much on comparison between a hybrid and the sti longblock without running AVCS
I've done both & IMO the hybrid was more fun to drive off boost .. way more torque down low ,I was still running 19 psi on my vf39 too
sense of nature is offline   Reply With Quote
Old 06-13-2010, 04:53 PM   #10
srREXed
Scooby Specialist
 
Member#: 72234
Join Date: Oct 2004
Chapter/Region: South East
Location: S. FL... Now Fort Polk, LA
Vehicle:
2004 WRX SRR
EJ257-35R-6MT

Default

ive got an 05 sti lb in my 04wrx with ej20 ecu and harness... Never plugged the cams or used avcs. Made 407whp with a 35r and the car runs great... My tune is open source. It has been the setup on my car for about a year now. Only thing i had to get was a cam angle sensor bracket from cosworth because the 05sti lb has the sensor in the front of the head instead of the rear like some other years.
srREXed 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
04 STI cluster in 03 WRX but no cruise control light Fierysun Electrical & Lighting 2 04-21-2010 10:39 AM
04 STI gauge in 03 WRX- gas level problem TommyWRX Electrical & Lighting 3 02-02-2008 05:43 AM
STi longblock in 2002 WRX WickedRydaX Subaru Conversions 10 02-12-2006 09:41 PM
04 STI suspension in 03 wrx tux Brakes, Steering & Suspension 3 04-19-2005 03:22 PM
04 USDM STI cluster in 03 WRX? Equilibrium Tuning Interior & Exterior Modification 4 06-22-2003 08:34 AM


All times are GMT -4. The time now is 08:37 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.