Welcome to the North American Subaru Impreza Owners Club Wednesday May 6, 2015
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 > Built Motor Discussion

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 10-27-2004, 10:59 PM   #1
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default v7 versus USDM STi valvespring comparo

Doing a little tinkering, found some interesting data:

USDM STi JDM v7 STi
free length: 1.860 1.730
installed height (1.417")pressure: 50 lbs 50 lbs
pressure @ 9.55 mm: 107 130

This is assuming you use a USDM STi camshaft with the JDM v7 valvetrain. When I measured these, it was evident that coil bind would not be an issue. Use this info for what ever you feel it's worth, I'm not suggesting you do anything with your EJ257 valvesprings.
* Registered users of the site do not see these ads.
n2xlr8n is offline   Reply With Quote
Old 10-28-2004, 01:16 AM   #2
ryu12341
Scooby Newbie
 
Member#: 44164
Join Date: Sep 2003
Vehicle:
2004 wrx sti
blue

Default

im a newb. are you saying they are just as good?
ryu12341 is offline   Reply With Quote
Old 10-28-2004, 10:25 AM   #3
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by n2xlr8n
I'm not suggesting you do anything with your EJ257 valvesprings.
At first glance, it seems the JDM springs would provide a higher rpm limit. How you would make power on a EJ257 without the supporting headwork and camshafts is "new science"....or lots of boost.

Just wanted to provide the community with the data; what they derive from it is up to them.
n2xlr8n is offline   Reply With Quote
Old 03-08-2006, 02:13 PM   #4
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Bump for move to "built engine forum"

S.
n2xlr8n is offline   Reply With Quote
Old 03-08-2006, 02:23 PM   #5
nhluhr
John Wayne Toilet Paper
Moderator
 
Member#: 7327
Join Date: Jun 2001
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2008 Mazdaspeed3
2006 Wrangler Sport

Default

done
nhluhr 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
FPGreen, JDM v7 heads, USDM STi block, CP Pistons Rizzo314 Engine/Power/Exhaust 0 08-11-2006 01:23 PM
V7 sb/ USDM STi heads rexnprogress Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 0 01-16-2006 09:16 PM
V7 sb/ USDM STi heads rexnprogress Subaru Conversions 0 01-12-2006 06:35 PM
04 US STi cams, v7/USDM STi intake manifolds n2xlr8n Private 'For Sale' Classifieds 52 04-26-2005 10:57 AM
USDM STi valvesprings = USDM WRX valvesprings? TexRex2002 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 1 04-12-2005 11:59 PM


All times are GMT -4. The time now is 12:17 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.