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11-06-2008, 01:30 PM | #1 |
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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 Mach V FastWRX.com
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11-06-2008, 01:49 PM | #2 |
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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 |
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 |
11-06-2008, 06:17 PM | #4 |
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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. |
11-07-2008, 12:50 PM | #5 |
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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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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. |
11-22-2008, 05:49 AM | #7 |
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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? |
11-22-2008, 09:24 AM | #8 | |
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Quote:
-Martin |
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11-22-2008, 10:25 AM | #9 |
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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 |
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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11-22-2008, 04:17 PM | #11 |
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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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11-22-2008, 04:30 PM | #12 |
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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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11-23-2008, 12:55 AM | #14 |
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11-23-2008, 03:55 PM | #15 |
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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. |
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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12-08-2008, 09:27 PM | #18 | |
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Quote:
--Dan Mach V FastWRX.com |
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12-09-2008, 02:13 AM | #19 |
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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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12-09-2008, 08:14 AM | #21 |
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12-09-2008, 11:29 AM | #22 | |
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Quote:
But what about the 07’s 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 who’s motor failed at 1200 miles. I’ve heard stories of how stock cars that were still in the break in period were failing. The 08’s 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 I’m getting at is, perhaps the stout 07’s were manufactured with 06 components. Perhaps some 08’s 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 07’s 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 others’ cars failed with the same map. Other than the lack of fuel “theories” 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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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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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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12-10-2008, 02:30 PM | #25 |
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thats a big possability and the stock ecu map sucks also.
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