Welcome to the North American Subaru Impreza Owners Club Tuesday June 2, 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 > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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 03-04-2009, 12:07 PM   #51
cucamelsmd15
Scooby Specialist
 
Member#: 122980
Join Date: Aug 2006
Chapter/Region: South East
Location: Raleigh, NC
Vehicle:
2010 F150, 2013 CX-5
92 Miata 15 TTF/PTF/E3

Default

Quote:
Originally Posted by silver arrow View Post
Many speculate it's the tune
Ive seen the maps, and I think the tune is the majority of it, personally.
* Registered users of the site do not see these ads.
cucamelsmd15 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 03-04-2009, 03:31 PM   #52
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

Quote:
Originally Posted by cucamelsmd15 View Post
Ive seen the maps, and I think the tune is the majority of it, personally.
I had mine custom tuned by a reputable tuner at 1000 miles with a proper breakin. It blew up the first autocross. My 05 mad TBE on stock tune for 2 years of autocrossing in 100 deg FL summers with no problems.
silver arrow is offline   Reply With Quote
Old 03-04-2009, 03:45 PM   #53
cucamelsmd15
Scooby Specialist
 
Member#: 122980
Join Date: Aug 2006
Chapter/Region: South East
Location: Raleigh, NC
Vehicle:
2010 F150, 2013 CX-5
92 Miata 15 TTF/PTF/E3

Default

^ Damage was probably done during break-in. Metal fatigue failure isnt instant.
cucamelsmd15 is offline   Reply With Quote
Old 03-04-2009, 09:38 PM   #54
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

http://www-odi.nhtsa.dot.gov/complaints/results.cfm

08 guys with blown engines make a complaint
silver arrow is offline   Reply With Quote
Old 03-06-2009, 01:52 PM   #55
tazswing
Scooby Specialist
 
Member#: 63767
Join Date: Jun 2004
Chapter/Region: NWIC
Location: PDX
Vehicle:
2009 OXT 5-spd
2011 STi hatch

Default

So, if it is metal fatigue, is it them just cheap material or is there an oiling issue on top of that creating too much friction etc. etc? I would agree the stock tune sucks, I have dyno plot of the fully stock tune and the torque looks like a roller-coaster.

Cars that got tuned or had the factory correction still failed, so does that mean the engines had undo stress before being tuned so were doomed? If the issue is only a poor material I would think there would be even more failures.

I am never going to drive my 08sti even near cold in fear of it being an oiling issue. In need to do internals nonetheless.
tazswing is offline   Reply With Quote
Old 03-07-2009, 12:54 AM   #56
M427
Scooby Newbie
 
Member#: 203457
Join Date: Feb 2009
Default

I think the factory got cheep and we got hypereutectic pistons. Even chevy LS7 engines have the same piston issues. When you build cylinder pressure too fast with hypereutectic pistons they fail. Bad tuning leads to detonation and rapid spikes in cylinder pressure. Hypereutectic pistons can not handle this and crack around the top ring land. This is an issue when tuning almost any newer stock engine not just a subaru. If you want to tune the first mod to any engine should be a good set of pistons. It might seem expensive but you will save lots of $ in the long run.
M427 is offline   Reply With Quote
Old 03-07-2009, 07:48 AM   #57
Integrity
Scooby Newbie
 
Member#: 156992
Join Date: Aug 2007
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2008 STi
Black

Default

Model year: 2008
Build date:
Purchase date: April 08
Failure date: October 08
Mileage at failure: 11,000
ECU recall performed? No
Was car modified? No


Integrity is offline   Reply With Quote
Old 03-18-2009, 09:52 PM   #58
oct1285
Scooby Newbie
 
Member#: 64665
Join Date: Jun 2004
Location: SA,TX
Vehicle:
1997 Toyota
Blurple

Default

excuse the noob question, but I just bought a used 08 sti. I received it with 33xx miles on it with the reflash on it. Can someone describe to me what the broken ring land sounds like?
oct1285 is offline   Reply With Quote
Old 10-01-2009, 03:47 AM   #59
Quattro71
Scooby Newbie
 
Member#: 177971
Join Date: Apr 2008
Chapter/Region: SCIC
Location: SoCal
Vehicle:
1998 Impreza 2.5 RS

Default

Quote:
Originally Posted by PGT View Post
there had been some talk of the crankshaft (I think) being improperly cleaned after machining, contaminating the oil supply. The TSB on the issue seems to support this with examination of the oil for contaminants as one of the required steps.

I worked at a Subaru dealership last year, and I think in late april we got word from Subaru to change the engine oil on all of the STI's in our inventory.. I'm pretty sure all dealers did this since it was mandated.. but it didn't seem to have helped...
Quattro71 is offline   Reply With Quote
Old 10-14-2009, 10:06 AM   #60
MidnightSti05
Scooby Newbie
 
Member#: 74064
Join Date: Nov 2004
Chapter/Region: MAIC
Default

bump any updates - I lost sleep over this issue and it seems I am only a few months from parting with my time bomb.

The notion that dealer/SOA are rejecting warranty claims on stock cars make me want to abandon the subaru ship ASAP.
MidnightSti05 is online now   Reply With Quote
Old 10-14-2009, 10:38 AM   #61
Butcherboy78
Scooby Newbie
 
Member#: 187108
Join Date: Aug 2008
Chapter/Region: Tri-State
Vehicle:
2008 Subaru STI
Aspen White

Default

unfortunately i am going to be dumping my car (probably for a loss) to get out of it since the warranty will be up within a couple months and i have zero confidence in this motor since it has already let me down at 12k miles. I will be looking to get into a 335, Evo, or even a Mini cooper JCW. There are plenty of other options out there that compete with this car for me to stick with a car that let me and many others down at such a short time. I really wish the pistons were a little stronger or whatever issue they are having with emissions/tune because i love the car as a whole and enjoy the culture and subaru family but i hate getting in my car everyday and checking my rearview for white smoke out my exhaust. I will probably come back to a subbie when/if they address this issue and hopefully step up to direct injection, but for now i have lost my faith. I will miss my baby.
Butcherboy78 is offline   Reply With Quote
Old 10-14-2009, 11:04 AM   #62
Defiant Autospeed
Vendor
 
Member#: 155450
Join Date: Jul 2007
Location: Austin/Beverly 2 of us now!
Vehicle:
2007 FXT
WRB

Default

Quote:
Originally Posted by oct1285 View Post
excuse the noob question, but I just bought a used 08 sti. I received it with 33xx miles on it with the reflash on it. Can someone describe to me what the broken ring land sounds like?

it doesnt sound like anything.

Do a leakdown test on the motor if you are concerned.
Defiant Autospeed is offline   Reply With Quote
Old 10-14-2009, 11:06 AM   #63
Defiant Autospeed
Vendor
 
Member#: 155450
Join Date: Jul 2007
Location: Austin/Beverly 2 of us now!
Vehicle:
2007 FXT
WRB

Default

Quote:
Originally Posted by Quattro71 View Post
I worked at a Subaru dealership last year, and I think in late april we got word from Subaru to change the engine oil on all of the STI's in our inventory.. I'm pretty sure all dealers did this since it was mandated.. but it didn't seem to have helped...

It wasnt to just change the oil. It was to do a complete reflash of the ECU.

The issue was that the factory rev limiter was cutting fuel violently at redline, which resulted in a BIG lean spot, under boost, which caused a LOT of failures. I have the paperwork somewhere around here.


As for the warranty denial, of the 5 dealerships within about 3 hours of me, none of them were rejecting claims on STOCK 08 motors.

<<Ex-Subie dealership tech, Ex-Subie sales person.
Defiant Autospeed is offline   Reply With Quote
Old 10-14-2009, 11:24 AM   #64
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

Quote:
Originally Posted by Butcherboy78 View Post
unfortunately i am going to be dumping my car (probably for a loss) to get out of it since the warranty will be up within a couple months and i have zero confidence in this motor since it has already let me down at 12k miles. I will be looking to get into a 335, Evo, or even a Mini cooper JCW. There are plenty of other options out there that compete with this car for me to stick with a car that let me and many others down at such a short time. I really wish the pistons were a little stronger or whatever issue they are having with emissions/tune because i love the car as a whole and enjoy the culture and subaru family but i hate getting in my car everyday and checking my rearview for white smoke out my exhaust. I will probably come back to a subbie when/if they address this issue and hopefully step up to direct injection, but for now i have lost my faith. I will miss my baby.
Just have a set of Mahle pistons put in. It will be cheaper than taking a loss and will solve the problem.
silver arrow is offline   Reply With Quote
Old 10-14-2009, 11:35 AM   #65
bannerd
Scooby Newbie
 
Member#: 110771
Join Date: Mar 2006
Location: Upstate NY
Vehicle:
2006 WRX
black

Default

What is a good cheap/forge piston to use? Curious
bannerd is offline   Reply With Quote
Old 10-14-2009, 12:19 PM   #66
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

Mahle???
silver arrow is offline   Reply With Quote
Old 10-15-2009, 11:01 PM   #67
Converted
Scooby Specialist
 
Member#: 52838
Join Date: Jan 2004
Location: 619
Default

Has Subaru said anything about changing this issue for the 09, or 2010 models ?

So this is something people are having an issue getting replaced under warranty...?

Thanks,
Converted is offline   Reply With Quote
Old 10-16-2009, 08:49 AM   #68
Erik F
Scooby Newbie
 
Member#: 211961
Join Date: May 2009
Chapter/Region: Tri-State
Location: Upstate NY
Vehicle:
09 WRX
Blue

Default

I know this is about the EJ257 of the STI, but what about stock and modded EJ255 of the 09+ WRX? How many of these are affected?
Erik F is offline   Reply With Quote
Old 10-16-2009, 11:44 AM   #69
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

I'm on engine #3 in my STI. The original engine #2 and #4. Now #4 again. I'm not screwing with it anymore. Mahles are going in the 3rd engine.
silver arrow is offline   Reply With Quote
Old 10-16-2009, 11:46 AM   #70
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

Quote:
Originally Posted by Converted View Post
Has Subaru said anything about changing this issue for the 09, or 2010 models ?

So this is something people are having an issue getting replaced under warranty...?

Thanks,
I've had 2 engines replaced under warranty, but my dealer fought for me on the 2nd one. This 3rd engine is getting Mahle pistons. It is crazy that a stock car, stock engine should have such weak pistons/rings.
silver arrow is offline   Reply With Quote
Old 10-16-2009, 12:15 PM   #71
Ferraz
Scooby Specialist
 
Member#: 173553
Join Date: Mar 2008
Chapter/Region: International
Location: Sao Paulo
Vehicle:
1996 Civic VTi
Dark blue

Default

Quote:
Originally Posted by Erik F View Post
I know this is about the EJ257 of the STI, but what about stock and modded EJ255 of the 09+ WRX? How many of these are affected?
I was told be friend who works for Subaru (here in Brazil), that they had to replace a good number of 08 WRXs and 09 FXTs engines. 90+% were stock!


My question here is... How are the new JDM EJ207 doing?
Ferraz is offline   Reply With Quote
Old 10-16-2009, 01:49 PM   #72
silver arrow
Scooby Specialist
 
Member#: 25859
Join Date: Oct 2002
Chapter/Region: South East
Location: Foriderp
Vehicle:
1965 MGB yellow
2008 Black Miata

Default

Quote:
Originally Posted by Erik F View Post
I know this is about the EJ257 of the STI, but what about stock and modded EJ255 of the 09+ WRX? How many of these are affected?
They have had many bearing problems. You can just do a search.
silver arrow is offline   Reply With Quote
Old 10-16-2009, 02:28 PM   #73
Illusive
Scooby Specialist
 
Member#: 90436
Join Date: Jul 2005
Chapter/Region: TXIC
Location: Sealy, TX
Vehicle:
2005 STI
Obsidian black pearl

Default

Quote:
Originally Posted by Converted View Post
Has Subaru said anything about changing this issue for the 09, or 2010 models ?

So this is something people are having an issue getting replaced under warranty...?

Thanks,
2009 are suffering from the same issues. I haven't read any 2010 reports, but I dont see why they would be any different. Subaru is staying tightlipped about this.
Illusive is offline   Reply With Quote
Old 10-16-2009, 02:53 PM   #74
Erik F
Scooby Newbie
 
Member#: 211961
Join Date: May 2009
Chapter/Region: Tri-State
Location: Upstate NY
Vehicle:
09 WRX
Blue

Default

I know about the bearing problem....I am in a safe range for the bad bearing problem. What would be nice to know is if this problem is happening to 5% of the people that have purchased the wrx and sti or if it is happening to 50%. I suppose it can seem like a ton of people are having the problem while reading posts on NASIOC, when in reality the people posting make up about .01% of all owners out there. My point is, how many cars are actually having problems to how many cars have been sold.
Erik F is offline   Reply With Quote
Old 12-16-2009, 02:50 PM   #75
06wrxlbart
Scooby Specialist
 
Member#: 154013
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: New York, Ozone Park
Vehicle:
2012 S4
Monsoon Grey

Default

Model year:2008
Build date:
Purchase date: NOV 08
Failure date: 12/13/2009
Mileage at failure: 11800
ECU recall performed? YES
Was car modified? (If so, list mods)

Actually I had stock pistons taken out and WEISCO 95.5 put in and my car possibly blew a forged piston on 20psi ATP30R, FMIC + supporting mods.

Good bye sti.
06wrxlbart 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
stock 2007 sti cracked ring lands 07pearlwhiteSti Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 64 12-30-2008 01:41 PM
Anyone know OEM 2.5 sti piston ring thickness? bugeyes Built Motor Discussion 4 06-30-2006 11:14 AM
FS: 06 sti pistons rings rods and pins 4goodtime Private 'For Sale' Classifieds 1 03-06-2006 10:10 AM
sti piston ring spec one wicked wrx Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 15 02-15-2005 05:38 PM
is OEM STI piston rings strong enough?? skyline31 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 2 01-15-2005 11:17 AM


All times are GMT -4. The time now is 05:45 PM.


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