Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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.







* 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 11-17-2009, 08:32 AM   #1
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default Help me make up my mind with me build (ARP studs)

Hey guys, for those of you who don't know I am putting together a fully built ej22t that is going to run a Water/air intercooler with a T67 turbo and i am hoping to reach 400-450 whp on my wrx and I have hit a huge dession point in my build. As it stands right now I have purchased a set of ARP head studs in hopes of gaining some extra clamping force.

I have been confronted by a few friends that are telling me that i am a fool for not running 1/2 studs. MY question is how often do you see HG failures or head studs pulling out the threads in the block because of high boost aplicatons? My builder is trying to find a set of heli coils that will fit down the block halfs but he feels that the head studs are fine the way they are because of the nature and differences in head studs compared to head bolts.
I wish Subaru made a cast iron block!!!

Has anyone used 11mm arp studs with helicoils? or is there another brand that has to be used?
* Registered users of the site do not see these ads.
cribbie is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-17-2009, 10:17 AM   #2
Safir
Scooby Guru
 
Member#: 3873
Join Date: Jan 2001
Location: Tampa, FL
Vehicle:
. Paradise is
like Disney with hookers

Default

I've seen 2.5's making 600WHP with ARP studs screwed directly into the block and not having HG issues...
Safir is offline   Reply With Quote
Old 11-17-2009, 11:17 AM   #3
WRXINTX
Scooby Specialist
 
Member#: 96712
Join Date: Sep 2005
Default

I personally have never seen any ARP head studs pull the threads out of the block....ever....


I have instalelled them on more than 20 Subaru Engines now and there has never been an issue like this to occur....


I personally have built 4 engines that make more than 550whp using the standard 11mm ARP head studs and running cometic head gaskets...


the only reason in my eyes that these studs could ever pull the threads out of the block would be if the engine builder torqued the studs into the block and stripped the threads out instead of just seating them gently as they are meant to be installed.... right at the edge of barely snug by hand.... or just enough to keep them from actually being torqued in....

because you are using the nut at the top to stretch the stud and make it act like a spring, you are not using the threads in the block to tighten the stud into for head retention....



now, on the other side of things, if you are going to build an all out Ej22T, and you are going to use a T67 turbo, which is capable of upwards of 650whp, I would almost recommend the 14mm studs to you, as your turbo will be capable of crossing the boundary of safety that I feel is around 580whp or so (depending on timing, fuel type, lack of detonation, etc.) to keep the head gasket sealed up.....


otherwise, if you are really aiming for 400-450whp, I would choose a smaller turbo that will give you more power through a broader powerband and make the car much quicker and more responsive (and more fun to drive!).... A Gt3076R or a GT35R or even a smaller T series turbo or a Borg Warner turbo that was a bit smaller.....


I have a T67 at home also, and an EJ22T block, and Oliver rods, but, I just haven't been able to mess with it yet when I enjoy my APS S/R 50( GT30R based turbo) so much.....
WRXINTX is offline   Reply With Quote
Old 11-17-2009, 05:32 PM   #4
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

Cosworth makes some nice studs...
Never seen those break. I've seen ARP's snap before.

http://www.cosworth.com/Default.aspx?id=1092219
mtcs 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
My 2004 STi VF39 Mod Path Beyond Stage 2: HELP ME MAKE UP MY MIND BEFORE I GO CRAZY! Red Rexx Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 50 12-05-2008 11:56 PM
Newbie from VWvortex looking to get a subaru, help me make up my mind. Demon_Dub Newbies & FAQs 12 09-04-2002 07:31 PM
Help me make up my mind wrxmontao!! New England Impreza Club Forum -- NESIC 8 06-03-2002 12:30 AM
Help me make up my mind on exhaust... wrx182 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 33 12-04-2001 02:23 AM
Help me make up my mind... Tim Prudence Technical Forum Archive 7 06-30-2000 12:58 AM

All times are GMT -4. The time now is 06:10 PM.


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.