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Old 11-06-2008, 01:30 PM   #1
Mach V Dan
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Default 2008+ STI Piston Ring Land Failure List

I'm starting this thread because I'm hearing more and more examples of engine failure on 2008 STIs, specifically broken ring lands, and I'd like to get some kind of registry of the failures. If you have had this failure, please post here in the following form:

Model year:
Build date:
Purchase date:
Failure date:
Mileage at failure:
ECU recall performed?
Was car modified? (If so, list mods)

Please keep this thread limited to this sort of post; analysis or discussion can be done elsewhere.

Thanks,

Dan
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Old 11-06-2008, 01:49 PM   #2
his_and_her_wrx
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Model year: 2008 STi
Build date: have not the slightest right now
Purchase date: 5 May 2008
Failure date: Engine ring/ Piston broke in for different places, mis fire in cyl 4
Mileage at failure: 2800 miles
ECU recall performed? 1 week after i got the car back
Was car modified? AP V2 Stage 1
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Old 11-06-2008, 02:29 PM   #3
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Model year:2008 sti
Build date:not sure
Purchase date:2/08
Failure date:8/08
Mileage at failure:17011
ECU recall performed?no, before available
Was car modified? DP, CAI, tuned by Jorge

BTW, Jorge started the same thread on IWSTI.

Tony
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Old 11-06-2008, 06:17 PM   #4
MartinD
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Here is 25+ page failure list on IWSTi:

http://www.iwsti.com/forums/gr-gener...ml#post2148728

This has happened to owners that have even purchased the car last month, and had the ECM reflash prior to purchase.


Model year:2008 sti
Build date: N/A
Purchase date: 12/07
Failure date: 10/08
Mileage at failure: 14,100
ECU recall performed? Yes
Was car modified? Yes, everything including turbo.
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Old 11-07-2008, 12:50 PM   #5
paulsaidhi
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yea same here, worked on an 08 sti with a 30R 1 track session piston 1 2 and 4 all cracked.
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Old 11-07-2008, 08:09 PM   #6
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I know of two right off the top of my head:

I see MartinD is already here

Second: not on here, but purchase date was 3/08. First blown ringland was 5/08 at 5k miles. Repaired under warranty. Second ringland went at 14k in 10/08. Car is currently sitting in his driveway, as Subaru has denied warranty coverage.
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Old 11-22-2008, 05:49 AM   #7
Lab Racer
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Has anyone that got the engine fixed under warranty and replaced with a long block had a second engine failure.

Do you thing Subaru did a partial recall and upgraded the pistons to forged units on replaced long blocks?
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Old 11-22-2008, 09:24 AM   #8
MartinD
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Quote:
Originally Posted by Lab Racer View Post
Has anyone that got the engine fixed under warranty and replaced with a long block had a second engine failure.

Do you thing Subaru did a partial recall and upgraded the pistons to forged units on replaced long blocks?
I know 2 owners locally and have seen 5-10 on the forums that have had this failure occur more than once.

-Martin
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Old 11-22-2008, 10:25 AM   #9
Louie
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07 STi FTW

A guy at my work, doesnt come here.

08 sti
bought his car in may of 08.
Tuned by Agile stage 2
has about 15k miles on his car
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Old 11-22-2008, 03:28 PM   #10
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Never buy the first next Gen of anything. They're the one with most problems.
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Old 11-22-2008, 04:17 PM   #11
FuJi K
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Quote:
Originally Posted by tux121 View Post
Never buy the first next Gen of anything. They're the one with most problems.
That's true, but Subaru still uses the same pistons on the EJ255/EJ257. The US will never get the good stuff like Japan. lolz!!! My EJ22T is still kicking w/ 170k miles on stock pistons and rings!
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Old 11-22-2008, 04:30 PM   #12
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Quote:
Originally Posted by tux121 View Post
Never buy the first next Gen of anything. They're the one with most problems.
My 04 STi is doin just fine lol
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Old 11-23-2008, 12:39 AM   #13
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this is why i pulled the motor at 800 miles and did drop ins. wiseco 99.5 / arp FTW.
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Old 11-23-2008, 12:55 AM   #14
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Quote:
Originally Posted by XRWITS View Post
My 04 STi is doin just fine lol

yeah my 04 is still tickin away with 65k on it...

20 psi stage 2 everyday...
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Old 11-23-2008, 03:55 PM   #15
RP31
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Quote:
Originally Posted by XRWITS View Post
My 04 STi is doin just fine lol
Were you lucky enough to buy the car after Subaru realized the first round of '04s had pinging issues?
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Old 11-23-2008, 06:04 PM   #16
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in my country all ej257`s cracked the piston ring land. whatever it is bone stock, tuned or prodrived. some of them take some short blocks through the warranty and then put these block some pistons and start to kick as hell

on the other hand before 2006 our all sti`s have ej207 and none of them have any problems, some of them made 150K km.
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Old 12-02-2008, 10:22 PM   #17
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You know, I got a quick question. What the hell does this sound/feel like? I broke mine in like I stole it after 600 miles and revved it up close to redline and it seems that I haven't got any problems.
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Old 12-08-2008, 09:27 PM   #18
Mach V Dan
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Quote:
Originally Posted by tripz1196 View Post
You know, I got a quick question. What the hell does this sound/feel like? I broke mine in like I stole it after 600 miles and revved it up close to redline and it seems that I haven't got any problems.
Early symptoms can be rough idle and misfire CEL codes. Later would be oil smoke from the tailpipe, rapid oil consumption, very rough idle and stumbling under acceleration, and loss of compression.

--Dan
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Old 12-09-2008, 02:13 AM   #19
Impreza541
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Quote:
Originally Posted by tux121 View Post
Never buy the first next Gen of anything. They're the one with most problems.
eh not true, 07 STIs have the same problem as the 08's, yet the 06 STIs were perfectly fine.
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Old 12-09-2008, 02:25 AM   #20
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reading all the above, all with busted pistons seemed to have been "tuned"?
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Old 12-09-2008, 08:14 AM   #21
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Quote:
Originally Posted by reddevil View Post
reading all the above, all with busted pistons seemed to have been "tuned"?
Nope. Many have gone when completely stock. We know of a few plus there are a few cases on IWSTI that have been documeted as such.

Tony
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Old 12-09-2008, 11:29 AM   #22
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Quote:
Originally Posted by Turn in Concepts View Post
Nope. Many have gone when completely stock. We know of a few plus there are a few cases on IWSTI that have been documeted as such.

Tony
I find it really odd how the 07 and 08 STI are hit or miss with the notorious ring failure. The 04 Ė 06 seemed to be stout. As we all know there are hundreds of horror stories about the 07.

But what about the 07ís that have not failed? What about my 07, it can blow tomorrow and it was still a strong car, 36k miles, 5k of which were @ 28psi on the stocker. I had a friend whoís motor failed at 1200 miles. Iíve heard stories of how stock cars that were still in the break in period were failing.

The 08ís received new rings under a new part number. Why at first did they seem strong as ever, now we see failures here and there. The 08 STI I have the most experience with took over 520whp with only 190 miles on the car, completely stock motor.

I work in a manufacturing facility and I know that during the production of parts, there are many different inspection callouts. Some parts are rejected for the way they look or for being just outside of a tolerance. They are sent for rework to cut losses.

If there is an excess of parts, rework is not rushed and parts can sit for awhile. What Iím getting at is, perhaps the stout 07ís were manufactured with 06 components. Perhaps some 08ís were put together with 07 components.

What changed form 06-07,08, the heads, the ECU, and the injectors. Two of the three have a huge bearing, obviously, on how these cars run.

The 07ís hesitated right off of the showroom floor, and ran lean under boost. Off of the showroom floor, I got onto the highway and got into a little competitive driving with a turbo TSX. Had 5 miles on the car at that point, no hesitation at all running through all of the gears, more than once. Where I drove my buddies and it felt like you would go nowhere for a second then accelerate.

Many will say a good tune would save an 07, and I believe this to an extent. But why do some say that a OTS COBB map eliminated hesitation in the 07, while othersí cars failed with the same map.

Other than the lack of fuel ďtheoriesĒ in cylinder 2 and or 4, as well as the timing tables that combine to produce destructive timing values, does any one have other input or comments towards any of this. I continue to push my car everyday, tomorrow its on the DYNO for yet more tuning and R&D. (The objective is a mid-high 11 second stock car) I would like to better understand why some of these cars are indeed failing, while some others are prospering.

-Mike
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Old 12-09-2008, 11:37 AM   #23
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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.
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Old 12-09-2008, 03:56 PM   #24
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Could oil be a factor in any of the failures?
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Old 12-10-2008, 02:30 PM   #25
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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.
thats a big possability and the stock ecu map sucks also.
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