Welcome to the North American Subaru Impreza Owners Club Monday May 4, 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 09-30-2010, 06:15 PM   #1
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default Let's talk aftermarket Head Studs

Hey,
well my block and heads should be on their way back to me in the next few weeks. There are a few loose ends on my build that I want to finalize before I start assembly.

I currently have a set of ARP std head studs in the garage that I was going to originally use on my build, but have decided against it.

A few motors ago, I stapped a std arp in half. Lets just say I wasn't too thrilled with ARP at that point. Apparently, I was told that once in a while there are freak head studs that break. Id really rather have 100% confidence in my studs than hope that they don't fail at high boost.

I have been searching online and have come accross a few aftermarket studs that seem promissing.

Rigoli 14mm head studs ($650 new. Pretty damn expensive. But is it worth it?)
P&L 13mm head studs
ARP L19 head studs
Cosworth 11mm head studs

Anyone have good/bad luck with any of these?
Anyone else make oversized studs for the subaru besides the ones in the list above?
* Registered users of the site do not see these ads.
mtcs is offline   Reply With Quote
Old 09-30-2010, 06:33 PM   #2
dap
Scooby Newbie
 
Member#: 214798
Join Date: Jun 2009
Chapter/Region: Tri-State
Location: Central, NY
Vehicle:
2011 Fully Built STI
Blue

Default

Quote:
Originally Posted by mtcs View Post
Hey,
well my block and heads should be on their way back to me in the next few weeks. There are a few loose ends on my build that I want to finalize before I start assembly.

I currently have a set of ARP std head studs in the garage that I was going to originally use on my build, but have decided against it.

A few motors ago, I stapped a std arp in half. Lets just say I wasn't too thrilled with ARP at that point. Apparently, I was told that once in a while there are freak head studs that break. Id really rather have 100% confidence in my studs than hope that they don't fail at high boost.

I have been searching online and have come accross a few aftermarket studs that seem promissing.

Rigoli 14mm head studs ($650 new. Pretty damn expensive. But is it worth it?)
P&L 13mm head studs
ARP L19 head studs
Cosworth 11mm head studs

Anyone have good/bad luck with any of these?
Anyone else make oversized studs for the subaru besides the ones in the list above?
Staying with the stock size have you thought about ARP 625+ aged? Were your previous ones ARP2000's?
dap is offline   Reply With Quote
Old 09-30-2010, 07:32 PM   #3
berdugo
Scooby Specialist
 
Member#: 163108
Join Date: Oct 2007
Chapter/Region: International
Location: Philippines
Vehicle:
07 EuroDM STi 2.5L
Silver

Default

berdugo is offline   Reply With Quote
Old 09-30-2010, 07:55 PM   #4
john 1badSTI
Scooby Specialist
 
Member#: 77470
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: grove city ohio
Vehicle:
04 sti 10.51@138.5
on e85@ 30psi--spinning

Default

unless you expect to see 40+ psi I would go with arp L19's,14mm require lots of work on the block and heads,I don't know if its the same for p&l 13 mm also.
john 1badSTI is offline   Reply With Quote
Old 09-30-2010, 11:23 PM   #5
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

I forgot about Roger Clark head studs...

The block just came back from darton and hasn't been assembled yet. So I don't think it should be too bad tapping the block for the studs. I know the P&L kit comes two taps. One for starting and one for the bottoming. the head on the other hand might be a little trickier but I rather be safe than sorry.
mtcs is offline   Reply With Quote
Old 09-30-2010, 11:40 PM   #6
amalgrover
Scooby Specialist
 
Member#: 183480
Join Date: Jun 2008
Chapter/Region: South East
Location: Valdosta, GA
Vehicle:
2011 Audi A3 Quattro
2009 Forester XT

Default

you know, i had a ppg 1st gear break on me just outside of break-in and ZERO launches (not even slipped launches) when i was only making 340wtq. does this mean that i should never trust a ppg gearset, do you think it means that either there was a build quality issue in just that particular set, or maybe it was an install issue when the gears were installed in the case? my point is that ARP is correct in stating that sometimes there are freak things that happen when manufacturing things in large quantities (and sometimes even small quantities). sometimes things just break when they shouldn't. i see it all the time on aircraft engines. we could have a bad part, order a new one, and then find out that the new part is bad right out of the box. does that mean we should find another manufacturer? not necessarily...obviously if it happens more than not, it is a problem, but most the time it is just one of those things that happens.
amalgrover is offline   Reply With Quote
Old 09-30-2010, 11:49 PM   #7
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

Quote:
Originally Posted by amalgrover View Post
you know, i had a ppg 1st gear break on me just outside of break-in and ZERO launches (not even slipped launches) when i was only making 340wtq. does this mean that i should never trust a ppg gearset, do you think it means that either there was a build quality issue in just that particular set, or maybe it was an install issue when the gears were installed in the case? my point is that ARP is correct in stating that sometimes there are freak things that happen when manufacturing things in large quantities (and sometimes even small quantities). sometimes things just break when they shouldn't. i see it all the time on aircraft engines. we could have a bad part, order a new one, and then find out that the new part is bad right out of the box. does that mean we should find another manufacturer? not necessarily...obviously if it happens more than not, it is a problem, but most the time it is just one of those things that happens.
I just don't know if the std arp studs are up to the task of keeping the heads on the shortblock when I start raising the boost.
mtcs is offline   Reply With Quote
Old 10-01-2010, 12:01 AM   #8
amalgrover
Scooby Specialist
 
Member#: 183480
Join Date: Jun 2008
Chapter/Region: South East
Location: Valdosta, GA
Vehicle:
2011 Audi A3 Quattro
2009 Forester XT

Default

i haven't had any problems running 28psi with an fpred...14,000miles strong right now...
amalgrover is offline   Reply With Quote
Old 10-01-2010, 02:01 PM   #9
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

I forgot about AMR's 9/16 big boy head studs. Thing is though, they are as expensive than the Rigoli 14mm studs...

Also, apparently these don't taper at all.
Any idea if the other brands use a taper or not?
mtcs is offline   Reply With Quote
Old 10-12-2010, 01:56 PM   #10
cnstman
Scooby Specialist
 
Member#: 9548
Join Date: Aug 2001
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2004 WRX STi
10.154 @139 @ 7,000'DA

Default

how much boost / hp do the standard arp head studs typically support before head lifting becomes an issue?
cnstman is offline   Reply With Quote
Old 10-12-2010, 02:06 PM   #11
hobbesnapoli
Scooby Newbie
 
Member#: 221436
Join Date: Aug 2009
Location: PA
Vehicle:
02 WRX vf39

Default

plenty... when's the last time you heard otherwise?
hobbesnapoli is offline   Reply With Quote
Old 10-12-2010, 02:27 PM   #12
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

The STD ARPs don't fail too often. The only reason mine failed was because apparently I had one freak stud.

Ive seen cars making over 600wheel and still using the 11mm std stud.
mtcs is offline   Reply With Quote
Old 10-12-2010, 02:57 PM   #13
cnstman
Scooby Specialist
 
Member#: 9548
Join Date: Aug 2001
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2004 WRX STi
10.154 @139 @ 7,000'DA

Default

Quote:
Originally Posted by mtcs View Post
The STD ARPs don't fail too often. The only reason mine failed was because apparently I had one freak stud.

Ive seen cars making over 600wheel and still using the 11mm std stud.
That is what I thought.
cnstman is offline   Reply With Quote
Old 10-12-2010, 04:45 PM   #14
Prevent
*** Banned ***
 
Member#: 149114
Join Date: May 2007
Location: I'm too mainstream
Default

sometimes **** happens..


i have ARP 2000's
Prevent is offline   Reply With Quote
Old 10-12-2010, 04:48 PM   #15
alcoolaid
Scooby Guru
 
Member#: 134949
Join Date: Dec 2006
Chapter/Region: VIC
Location: Vancouver, BC
Vehicle:
'07 SWP STi
Instagram | arthurlam89

Default

Im using the std arp studs as well.
alcoolaid is offline   Reply With Quote
Old 10-12-2010, 05:36 PM   #16
PhatBotti Tuning TKR
NASIOC Vendor
 
Member#: 239659
Join Date: Feb 2010
Chapter/Region: Tri-State
Location: Tri-State / California
Vehicle:
STI Mikey & Phatron
Tuning Da Subies

Default

Contact AMR in Mamaroneck, NY. They have some beefy studs they manufacture in house
PhatBotti Tuning TKR is offline   Reply With Quote
Old 10-12-2010, 06:44 PM   #17
Junior2JZ
Scooby Guru
 
Member#: 64908
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Tuning 8/9sec Subies @ P&L
Vehicle:
10.8 XT+10.0@143 GR+
2x9.0@170mph GTRs

Default

Get the P&L Kit you will not regret it.. I have used them on the last 5 motors we have built. They work awesome and are a quality arp2000 stud with ARP hardware. They also come with the taps needed install them.
I have them in my own motor and so does OverBoostin. I know they are used in the P&L drag STI, drag GC, Fast Eddies 139mph street car and a few other very fast cars.

Jr
Junior2JZ is offline   Reply With Quote
Old 10-12-2010, 06:46 PM   #18
Junior2JZ
Scooby Guru
 
Member#: 64908
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Tuning 8/9sec Subies @ P&L
Vehicle:
10.8 XT+10.0@143 GR+
2x9.0@170mph GTRs

Default

FWIW, I don't think you can run a OEM block dowel with the 14mm kits. If you can you will have to machine them down to nothing to fit the stud through them. I wouldn't feel to great about not having block dowels..
Junior2JZ is offline   Reply With Quote
Old 10-13-2010, 03:45 AM   #19
STIV6
Scooby Newbie
 
Member#: 27458
Join Date: Oct 2002
Location: Sydney
Vehicle:
2003 STI
Blue

Default

STIV6 is offline   Reply With Quote
Old 10-13-2010, 07:44 AM   #20
tuspace
Scooby Newbie
 
Member#: 57959
Join Date: Mar 2004
Chapter/Region: International
Location: Australia
Vehicle:
1998 GC WRX
Red

Default

^^^^ PBMS and the other ones I can think of are PMS (Perfourmance - http://www.pms.net.au/ )
tuspace is offline   Reply With Quote
Old 10-13-2010, 07:26 PM   #21
mtcs
Scooby Specialist
 
Member#: 180640
Join Date: May 2008
Chapter/Region: E. Canada
Location: Montreal, Canada
Vehicle:
2000 Drag RSTi
8.96 @ 163

Default

Well, im going against my better judgement and am cutting a corner. I don't really want to waste anymore time waiting on machine shops to complete a tap/helicoil or timesert job on an assembled shortblock. If it were just the bare block, then it would be a different story.
So I have decided to go with some 11mm L19 studs. They have clamping of 260,000 so that should be more than enough for my build. I hope...
mtcs is offline   Reply With Quote
Old 10-14-2010, 02:26 AM   #22
project_skyline
Scooby Specialist
 
Member#: 153880
Join Date: Jul 2007
Chapter/Region: RMIC
Location: Western Slope, Colorado
Vehicle:
03 Evo VIII
2011 STI

Default

I'm wondering if anyone thinks standard ARP's will be good for 45 psi and around 700-800whp? lol
project_skyline is offline   Reply With Quote
Old 10-14-2010, 09:28 AM   #23
Junior2JZ
Scooby Guru
 
Member#: 64908
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Tuning 8/9sec Subies @ P&L
Vehicle:
10.8 XT+10.0@143 GR+
2x9.0@170mph GTRs

Default

Quote:
Originally Posted by project_skyline View Post
I'm wondering if anyone thinks standard ARP's will be good for 45 psi and around 700-800whp? lol
Yea been there by accident. They held on decent, but it did push water even with orings


Jr
Junior2JZ is offline   Reply With Quote
Old 01-28-2014, 07:12 PM   #24
manusti18
Scooby Newbie
 
Member#: 340620
Join Date: Dec 2012
Default

I ran the arp 2000 at 42psi on a gt35r on e98 after about 25 2-6 th gear pulls it finally lifted now I'm running my arp 625+ at 45 psi and they are holding perfectly on our custom sleeves
manusti18 is offline   Reply With Quote
Old 01-28-2014, 07:17 PM   #25
manusti18
Scooby Newbie
 
Member#: 340620
Join Date: Dec 2012
Default

Now I'm getting a new turbo kit made a front facing turbo kit 6766 T4 1.32 divided twin scroll trying to see what our sleeves hold. They are NOT O ringed going for 900 whp. But I'm already building my next engine Darton sleeved O ringed 14 mm headstuds with a custom head gasket Aries pistons Manly turbo tuff rods acl bearings Gsc s3 284 cams gsc springs and retainers manly oversized valves Bc cam gears Port n polish
manusti18 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
let's talk aftermarket subframes Phil Jr. Brakes, Steering & Suspension 165 10-29-2007 07:11 PM
Let's talk head studs/bolts..... bboy Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 43 09-27-2006 05:57 PM
Let's talk aftermarket batteries jblaine Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 6 01-03-2003 12:52 PM
Let's talk heads and bottom end MiXer Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 2 05-02-2002 08:25 PM


All times are GMT -4. The time now is 08:06 AM.


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.