Welcome to the North American Subaru Impreza Owners Club Thursday August 22, 2019
Home Forums 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.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 01-21-2017, 09:01 PM   #26
Juice66
Scooby Specialist
 
Member#: 340526
Join Date: Dec 2012
Vehicle:
2004 WRX STi
HTA86

Default

Quote:
Originally Posted by WhatTurboLag? View Post
What is the advantages of doing a 1/2" stud over a 625 on a non closed deck block?





Currently doing a "budget" build to get the car up, and a closed deck is unfortunately an extra 1500 I cannot spend. But o ringing the stock block and 625 or 1/2" studs I would do if it made sense.



75 lb/min turbo.

Clamping force. A 625 stud should hold everything a 75lb/min can offer if your tuner is worth a $h|t
* Registered users of the site do not see these ads.
Juice66 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-21-2017, 11:05 PM   #27
WhatTurboLag?
Scooby Specialist
 
Member#: 243992
Join Date: Apr 2010
Chapter/Region: MWSOC
Location: Morton Grove, Illinois
Vehicle:
2006 WRX TR
WRB

Default

Quote:
Originally Posted by Juice66 View Post
Clamping force. A 625 stud should hold everything a 75lb/min can offer if your tuner is worth a $h|t
Yep he is a good one for sure.

Would o rings help on a non closed deck block? Or the increased clamping force "stiffen" the cylinder bores?

Seems 625's as planned is my best bet and might o ring it for redundancy.
WhatTurboLag? is offline   Reply With Quote
Old 01-22-2017, 12:36 AM   #28
Juice66
Scooby Specialist
 
Member#: 340526
Join Date: Dec 2012
Vehicle:
2004 WRX STi
HTA86

Default

Sounds more like a budget build than anything, although a good one. My H11 studs held 32psi on my HTA86 just fine with E. You should be good to go with what you have. Skip the o ringing, imo.
Juice66 is offline   Reply With Quote
Old 01-22-2017, 01:16 AM   #29
WhatTurboLag?
Scooby Specialist
 
Member#: 243992
Join Date: Apr 2010
Chapter/Region: MWSOC
Location: Morton Grove, Illinois
Vehicle:
2006 WRX TR
WRB

Default

Right now, the block is the fuse it seems.

2011+ crank
H tuff rods
Orbit pump
King bearings
Stock 06 WRX heads
Turbo tuff Pistons.
Stock 200k mile 701 casting block (bores look good still, I believe in well seasoned blocks) no current block mods planned
625 head studs
Haven't decided on head gasket.
WhatTurboLag? is offline   Reply With Quote
Old 01-22-2017, 10:31 AM   #30
KillerBMotorsport
NASIOC Vendor
 
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

Quote:
Originally Posted by WhatTurboLag? View Post
Would o rings help on a non closed deck block? Or the increased clamping force "stiffen" the cylinder bores?
IMO o-rings are pointless unless you sleeve. Squeezing an o-ring between two soft materials just does not apply enough squish to the o-ring. High power builds have even tried multiple o-rings on closed deck blocks, and they still fail (although they are also pushing high cylinder pressures).

I think Juice is on track with the no o-ring recommendation.

Pay close attention to the head gaskets surface requirements specs, torque procedures, and if you want to go an extra step (which almost no one does), re-torque after break-in.
KillerBMotorsport is offline   Reply With Quote
Old 06-28-2019, 05:05 PM   #31
grangepack2
Scooby Newbie
 
Member#: 428757
Join Date: Aug 2015
Location: Uganda
Vehicle:
1994 Impreza v9 207
White

Default

Quote:
Originally Posted by primetime2123 View Post
if the 625+ pulled at 18 psi your builder put the block together wrong. i have had the regular arp at 30 psi with no issues
at what HP?
grangepack2 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

All times are GMT -4. The time now is 07:56 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.