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08-14-2008, 12:17 PM | #1 | |
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2008 STI Recalled for ECU Reflash - WVE-15
I noticed this at http://techinfo.subaru.com/html/litS...VE-15&x=37&y=6
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08-14-2008, 12:34 PM | #2 |
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07 models have a newer ECU also, I wonder if their ring land problems are related.
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08-14-2008, 12:48 PM | #3 |
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^^^ all STi's share the same ringland issue. It is due to the weak cast pistons. Subaru's detonate too easy, I love my STi, but I wish the OE engine build was more like the Evo
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08-14-2008, 12:53 PM | #4 |
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08-14-2008, 01:00 PM | #5 | |
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Here is the bulletin:
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08-14-2008, 01:06 PM | #6 |
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08-14-2008, 01:14 PM | #7 |
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to a degree, sure. Subaru is trying to meet Level 2 emissions standards. But because of the different modes, ie. sport, sharp... they have different fueling and boost targets specific for each map those modes have. in short, it isn't as aggressive as the 07 logic because of the different ECM map modes you can choose from, but yes they are still running too lean.
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08-14-2008, 02:00 PM | #8 |
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Vehicle:2006 STi Black&Gold Stage 2 |
I wonder, flash 2 different maps into the I mode and S mode, like pump gas map & race gas map.
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08-14-2008, 02:01 PM | #9 |
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08-14-2008, 05:45 PM | #10 |
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Vehicle:2008 STi |
So is this all 2008 STI's, or am I reading over any date or VIN cutoff there? My VIN does not show up on a STIS search yet...
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08-14-2008, 06:48 PM | #11 | |
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You can however raise and lower boost to suit your particular weather conditions, gas consumption needs, etc. with the i/s/s# knob and some clever tuning. -Ty |
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08-14-2008, 09:21 PM | #12 |
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Subaru effectively disabled the 'rev limit fuel resume' logic with the 08 STi. Prior years (and all other models with the 32-bit ECU), will not resume fueling after a rev limit fuel cut until engine speed drops below the low threshold AND boost drops below about 9.7 psig at sea level. With the 08 STi, fueling will resume regardless of boost (only the engine speed threshold comes into play). This seems to be precisely what they are talking about. So, likely the fix is to lower the boost threshold (currently an unobtainable 24 psig at sea level).
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08-15-2008, 02:58 PM | #13 | |
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08-15-2008, 03:20 PM | #14 |
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It is a common practice by the engineers. And it makes sense as rewriting a routine to eliminate the threshold could introduce bugs (as well as take additional time) - you already have a routine that has been proven and tested so why mess with it. So, they simply raise the threshold to an artificially high value that will never be achieved. Since the target boost at redline is about half of that threshold (~ 13 psig at sea level), it will never come into play and therefore there's never a delay in resuming fueling based on boost.
Last edited by Tea cups; 08-15-2008 at 03:28 PM. |
08-15-2008, 03:59 PM | #15 | |
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08-31-2008, 01:32 AM | #16 | |
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So that really doesn't answer the question of why the threshold was set beyond an achievable trigger level. Mistake? Black Ice [ ] |
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08-31-2008, 10:35 AM | #17 |
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There's no such thing as "typos" when it comes to this sort of thing, if that is what you are saying. So, they intended to eliminate that the threshold from coming into play as that is precisely how they always do it. Hard to say why they changed it. Perhaps during track testing and bouncing off the rev limiter they felt the "delay" in resuming fuel was hurting track times (that might be reflected in a future magazine review) and thought that the removal of this "safety" feature would not cause any ill effects. That was their mistake, I guess, if that is really the cause of the engine failures.
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08-31-2008, 02:12 PM | #18 |
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...thinking that's a big IF....
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08-31-2008, 03:29 PM | #19 |
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Vehicle:2007 STI Blouch Dom3 |
Sooo is this Subaru finally admitting problems with their stock tune (just 08 however in this case not 07)?
Bout ****ing time. |
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