Subaru WRX STI getting ECU reflash for combustion issues
Click on the image above for our high-res 2008 WRX STI gallery
Subaru of America announced a service campaign this week focused on the 305-hp turbocharged 2.5-liter four powering the 2008 WRX STI. According to the verbiage on a letter sent to an owner, Subaru states that "abnormal combustion" could occur when the engine is repeatedly or continuously operated above redline (6,700 rpm). At these high engine speeds, the Engine Control Module cuts fuel to the powerplant to protect the engine from even higher revolutions (this is common industry-wide, not just with Subaru). Unfortunately, under certain situations the Subaru 4-cylinder Boxer is still under high boost and the fuel cut-off causes the engine to run "over lean" resulting in combustion that breaks piston ring lands... eventually destroying the engine.
Subaru's "Service Program Campaign WVE15" reprograms the Engine Control Module software to improve combustion at engine speeds above redline, preventing engine damage. Subaru is quick to point out that the revised programming "will not adversely affect the peak performance" of the vehicle, so owners need not worry about the free campaign messing up their 0-60 sprints. Letters from Subaru will go out to owners in the next week or two. In the meantime, try keeping the white needles out of the red zone!
Gallery: Review: 2008 Subaru Impreza WRX STI
[Source: IWSTI]
Dear 2008 WRX STI owner:
During a quality review, we discovered that under certain harsh driving patterns, specifically when repeatedly or continuously operating the engine above the "red-line" (RPM above 6,700), abnormal combustion could occur resulting in serious internal engine damage in the form of broken piston ring lands. This abnormal combustion condition is the result of an "over lean" fuel mixture caused by a combination of fuel cut activation and high turbo boost. To prevent this condition from occurring, Subaru has developed a modification to the Engine Control Module software logic that will improve combustion management above "red-line" engine speed. This revised logic will not adversely affect the peak performance of your vehicle.
Thank you for the opportunity to be of assistance. If you need any future assistance, please let us know.
Subaru of America, Inc.
Customer/Dealer Services Department
Reader Comments (Page 1 of 2)
Richard 5:09PM (8/16/2008)
Good to know.
With the WRX getting some nice improvements - including more power - for '09, I wonder what changes are afoot for the STI.
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RJP 10:03PM (8/16/2008)
An SOA rep has said that the STi will remain unchanged for 2009.
Richard 9:08AM (8/17/2008)
Thanks for that.
It is a bit disappointing. I was hoping for better seats and thinking that, if the WRX got a little more power, maybe the STI...
toronado455 5:17PM (8/16/2008)
Forget the combustion issues. What about the rust issues?
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rav3 10:44PM (8/16/2008)
I have a 2002 WRX sedan I keep in good condition and wash at least once a month and wax it once a year. I live near the Pacific Coast and it still looks like new. The newer models tend to have a bit nicer paint quality than mine - especially since I didn't opt for the extra safety coat or whatever it was they offered.
Seems strange newer models have rust "issues".
How about some links, Tornado...
Chris 6:00PM (8/16/2008)
Why bother...I say let the numbnutz that overrev their engines pay for the repairs...awful nice of Subaru. Can't say I would expect other OEMs to do the same...
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dinnercoat 7:05PM (8/16/2008)
Heaven forbid someone who bought one expecting a sports car to *gasp* actually drive it like one!
jordan 11:58PM (8/16/2008)
@dinnercoat
Ummm...have you seen the dyno graph of an STi? I have a feeling that you're not making as much power past red line as you would after you shift to the next gear. :/
naggs 12:30AM (8/17/2008)
its the drivers fault if the redline is exceeded
FamilyGuy 6:31PM (8/16/2008)
Quite a few people on the subaru boards that are blowing engines. A lean factory tune in the upper rpm range seems to be blowing rings on the pistons.
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Geeky1 7:55PM (8/16/2008)
The 07 fuel map had problems as well (apparent misfires between 2500 and 4500rpms that get worse the deeper you are into the throttle) but they haven't released an update for that that I know of.
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Richard 9:12AM (8/17/2008)
Lots of Subarus did that.
My '06 Spec. B did that, they replaced the ECU on a campaign and it is mostly gone. My gas mileage is up 15% too, which I appreciate right now.
G-Money 9:16PM (8/16/2008)
toronado455, what rust issues? I've heard about the paint chipping issues, is this what you're referring to?
As far as the reflash - this, coupled with the "Stop Sale" order (on turbo models, not just the STI), would make me rather reluctant to buy an '08 STI. Even though they say that only certain cars are affected, it makes you wonder. Hopefully, all of these issues will be taken care of before they ship any '09 models.
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T2 6:10PM (8/18/2008)
Anyone know bore and stroke ?
Be interesting to know piston speed @6700rpm
T2
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BMWdownshift 9:47PM (8/16/2008)
That's what we call in the industry a "Shnykies!"
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Mike 10:25PM (8/16/2008)
"Combustion", that makes me laugh, combustion is what happens naturally in an engine.
Looks like Suburu is adopting Toyota's PR department. An unwanted combustion event is considered detonation, a much more scary (and n this case accurate) word. In a power adder car, detonation= bye bye engine. Looks like the ring lands are the weakest link in this motor.
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n!ck 2:30AM (8/17/2008)
I wish the ECU reflash somehow limited spark instead of fuel.
also: Launch control!
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MastrCake 2:47AM (8/17/2008)
"In the meantime, try keeping the white needles out of the red zone!"
Yea, cause you know, the whole tach isn't red.
:p
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Muscovy 4:01PM (8/17/2008)
"...under certain situations the Subaru 4-cylinder Boxer is still under high boost and the fuel cut-off causes the engine to run "over lean"..."
So, really, they couldn't foresee a problem like this...?
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4b11 9:39PM (8/17/2008)
And this is the best engine of the year category 2.0-2.5??? SUCK AWARD! ..... the 4b11 T is much most better!
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