Welcome to the North American Subaru Impreza Owners Club Friday November 28, 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 General > Newbies & FAQs

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 06-18-2009, 04:09 AM   #1
JDMFLCL
Scooby Specialist
 
Member#: 180513
Join Date: May 2008
Chapter/Region: RMIC
Location: Super Eurobeat Vol 193..Denver
Vehicle:
Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

Default School me on ringland failure...preventive measures?

So i see they seem to fail alot in the ej257s. what can one do to prevent this. If you use aftermarket rings on the forged sti pistons...does this get rid of the issue?
* Registered users of the site do not see these ads.
JDMFLCL is offline   Reply With Quote
Old 06-18-2009, 04:14 AM   #2
godfather2112
Papi Chulo
Moderator
 
Member#: 53794
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Seattle
Vehicle:
.... OT Supplement
Testing Division.

Default

If your going to crack open the block you might as well just add pistons. From my experience, running high boost leads to ringland failure. You will see alot of guys run gt30's and there motors last a long time on 18psi VS someone like me who had a fp green running around 21psi. My motor lasted until 55xxx miles then the 3rd cylinder went. But to be honest if you just plan on running stage two or a small turbo then your car should last a very long time ASSUMING you do all the regular maintenance.
godfather2112 is offline   Reply With Quote
Old 06-18-2009, 04:27 AM   #3
kpluiten
Scooby Guru
 
Member#: 120273
Join Date: Jul 2006
Chapter/Region: SWIC
Location: AZ
Vehicle:
06 WRBWRXWGN
Now with 100% more Spec-C

Default

The STi pistons (at least USDM, I dunno about others) are not forged. An while I may be off base with this, it's not he rings that have issues on these motors. The failures in ringland are actual cracks in the piston themselves. The rings are fine for the most part.
kpluiten is offline   Reply With Quote
Old 06-18-2009, 11:26 AM   #4
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by kpluiten View Post
The STi pistons (at least USDM, I dunno about others) are not forged. An while I may be off base with this, it's not he rings that have issues on these motors. The failures in ringland are actual cracks in the piston themselves. The rings are fine for the most part.
Correct, the STi pistons are hyperutectic, not forged, and the part that dies is the ring LAND, not the ring itself. To avoid any ring land problems, make SURE your car isn't detonating...that's about the best you can do.
the suicidal eggroll is offline   Reply With Quote
Old 06-18-2009, 11:58 AM   #5
JDMFLCL
Scooby Specialist
 
Member#: 180513
Join Date: May 2008
Chapter/Region: RMIC
Location: Super Eurobeat Vol 193..Denver
Vehicle:
Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

Default

ah k good to know, just wanted more info
JDMFLCL is offline   Reply With Quote
Old 06-18-2009, 12:11 PM   #6
FlatironsTuning.com
NASIOC Vendor
 
Member#: 171650
Join Date: Feb 2008
Location: Boulder, Colorado
Default

Quote:
Originally Posted by JDMFLCL View Post
ah k good to know, just wanted more info
It is also worth mentioning that ring land failures are most common on moderate to heavily modified STI's, or STI blocks that are still using the stock pistons. There are a large number of STI's out there running with OEM pistons that are lightly tuned that have had no issues.

Fundimentally, it comes down to the quality of the tune that you are running, and how hard you want to push your car.

IMO, if you are looking to make more than about 350 whp on an STI block, it is not a bad idea to put in forged pistons.

J. Cooley
Flatirons Tuning Project Car
Flatirons Tuning F.A.Q. Blog
Flatirons Rally Team Blog

FlatironsTuning.com is offline   Reply With Quote
Old 06-18-2009, 12:14 PM   #7
JDMFLCL
Scooby Specialist
 
Member#: 180513
Join Date: May 2008
Chapter/Region: RMIC
Location: Super Eurobeat Vol 193..Denver
Vehicle:
Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

Default

so 350 whp would be a good basepoint for the hypereuretic pistons then

i'm on a jdm 2.0 with the same forged rods/forged crank/hyper pistons.

hence my inquiry
JDMFLCL is offline   Reply With Quote
Old 06-18-2009, 01:36 PM   #8
stretchedk7
Scooby Guru
 
Member#: 170602
Join Date: Jan 2008
Location: j-ville fl
Vehicle:
06 Wrx RWD Auto
76MM-AEM-2200's

Default

ringland failure-high boost, detonation, knock, bad gas...ect...
stretchedk7 is offline   Reply With Quote
Old 06-18-2009, 02:18 PM   #9
kpluiten
Scooby Guru
 
Member#: 120273
Join Date: Jul 2006
Chapter/Region: SWIC
Location: AZ
Vehicle:
06 WRBWRXWGN
Now with 100% more Spec-C

Default

^^ bad gas ^^

I filled up at a local reputable station (Chevron). For whatever the reason, the pump moved very very slowly, but I thought nothing of it and I don't know if it had anything to do with it, but 14 miles later I start getting misfire codes and rough rough idle. It all went down hill from there as I discovered a couple of days later that I had lost #4. Was bad gas the cause of blown cylinder #4? I don't know, but the two events sure happened very close to each other... All and all it was a pretty lame way to lose a motor... no good story or anything like my floor boards falling out in a street race or something.


I will be running e85 now to avoid detonation. The more I learn, the more I invest in my car to try to avoid detonation. The AZ heat does not help.
kpluiten is offline   Reply With Quote
Old 06-18-2009, 02:19 PM   #10
stretchedk7
Scooby Guru
 
Member#: 170602
Join Date: Jan 2008
Location: j-ville fl
Vehicle:
06 Wrx RWD Auto
76MM-AEM-2200's

Default

yes e85..very nice.
stretchedk7 is offline   Reply With Quote
Old 06-18-2009, 03:01 PM   #11
z&cobb
Scooby Specialist
 
Member#: 12344
Join Date: Nov 2001
Chapter/Region: MAIC
Location: Mountains of Maryland
Vehicle:
2002 2JC
blue

Default

Quote:
Originally Posted by kpluiten View Post
^^ bad gas ^^

I filled up at a local reputable station (Chevron). For whatever the reason, the pump moved very very slowly, but I thought nothing of it and I don't know if it had anything to do with it, but 14 miles later I start getting misfire codes and rough rough idle. It all went down hill from there as I discovered a couple of days later that I had lost #4. Was bad gas the cause of blown cylinder #4? I don't know, but the two events sure happened very close to each other... All and all it was a pretty lame way to lose a motor... no good story or anything like my floor boards falling out in a street race or something.

I will be running e85 now to avoid detonation. The more I learn, the more I invest in my car to try to avoid detonation. The AZ heat does not help.
Yesterday's newspaper had a report showing a couple of gas stations in Baltimore had bad gas and a bunch of cars were ruined. They said it had to do with water. I wonder how much water you have to have in ethanol containing gasoline to have that kind of effect?
z&cobb is offline   Reply With Quote
Old 06-18-2009, 07:17 PM   #12
sarcasmo
Scooby Newbie
 
Member#: 50301
Join Date: Dec 2003
Chapter/Region: NWIC
Location: Mill Creek, WA
Vehicle:
2004 BMW
330i

Default

Quote:
Originally Posted by kpluiten View Post
^^ bad gas ^^

I filled up at a local reputable station (Chevron). For whatever the reason, the pump moved very very slowly, but I thought nothing of it and I don't know if it had anything to do with it, but 14 miles later I start getting misfire codes and rough rough idle. It all went down hill from there as I discovered a couple of days later that I had lost #4. Was bad gas the cause of blown cylinder #4? I don't know, but the two events sure happened very close to each other... All and all it was a pretty lame way to lose a motor... no good story or anything like my floor boards falling out in a street race or something.


I will be running e85 now to avoid detonation. The more I learn, the more I invest in my car to try to avoid detonation. The AZ heat does not help.
I can relate. I filled up with 92 (best we have over here) and started immediately getting detonation (none whatsoever with my tune up until that point). I was really pissed. That was the last time I ever went to that station.
sarcasmo is offline   Reply With Quote
Old 06-18-2009, 10:33 PM   #13
Got Boost?
Scooby Specialist
 
Member#: 113096
Join Date: Apr 2006
Chapter/Region: SWIC
Location: vegas..
Vehicle:
06 sti

Default

I broke ring lands in my motor at about 12k with only tbe and an ots tune from Cobb. If you are going in to the block, replace the pistons and have the needed machine work done to match. U will be sorry if you dont...
Got Boost? 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
School me on PlayOn, Netflix, Hulu, etc. on PS3 -=C=- Off-Topic 14 03-02-2010 06:38 PM
school me on taxes on money made from real estate.. lotusdrift Off-Topic 32 04-20-2007 05:59 PM
Somebody school me on external wastgates! Dick Fitzwell Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 26 06-18-2003 05:11 AM
School me on RS cat pipes Albert Normally Aspirated Powertrain 6 12-30-2002 05:14 AM
Nano: School me on the S-AFC WRXnFX Alaskan Impreza Club Forum -- AKIC 34 05-24-2002 03:53 PM


All times are GMT -4. The time now is 09:20 PM.


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.