2009 997.2 PSM FAILURE
10-27-2009, 11:21 PM
#31
Rennlist Member
I'm not one of those PDK people...
10-27-2009, 11:52 PM
#32
Race Director
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10-28-2009, 12:02 AM
#33
Poseur
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Porsche does, indeed, know that their cars are used on tracks. They are not using that as an excuse for not covering failures. There are way too many references to track events with Porsche owners for them to hide behind that.
10-28-2009, 01:16 AM
#35
Bet you a case of beer that it is... simple data guardband limits within the PSM module. Shut down is the default safety mechanism whenever the PSM module senses that its instructions can not or, will not, be safely met.
Least likely: Input overload- One of the sources, or more than one of the sources in combination, is/are feeding information into the PSM module so fast that the data reaches the limit of the module's data gathering guardband... leading to a PSM module "TILT" and a system shutdown for "safety" and legal liability.
More likely: False output readings - The PSM module is getting feedback data in response to its instructions that falsely make the PSM module believe that it's instructions are not being followed leading to a PSM module "TILT" and a system shutdown for "safety" and legal liability.
A possible example... something like the PASM's adjustable dampers are given instructions by the PSM module to electrically stiffen to avoid hitting the "stops" of the damper extreme, but, the data coming back to the PSM module as it checks that its instructions are being followed is an unchanging singular damper extreme for too long a period of time, or too many unique damper extremes for a period of time and over a specific "refresh" period of time (in this case the length of time for this corner at 130mph) the PSM module interprets this return data as indicative of a damper failure and, as programmed by Stuttgart, it shuts the PSM module down. And the shutdown defaults are all of those individual lockdown and/or lockout settings on the car's systems... for "safety" and legal liability.
Solution? Reflash the PSM's eeprom with greater data guardbands... or don't drive this specific corner faster than 129mph with the current data guardbands.
Just my .18 cents.
Least likely: Input overload- One of the sources, or more than one of the sources in combination, is/are feeding information into the PSM module so fast that the data reaches the limit of the module's data gathering guardband... leading to a PSM module "TILT" and a system shutdown for "safety" and legal liability.
More likely: False output readings - The PSM module is getting feedback data in response to its instructions that falsely make the PSM module believe that it's instructions are not being followed leading to a PSM module "TILT" and a system shutdown for "safety" and legal liability.
A possible example... something like the PASM's adjustable dampers are given instructions by the PSM module to electrically stiffen to avoid hitting the "stops" of the damper extreme, but, the data coming back to the PSM module as it checks that its instructions are being followed is an unchanging singular damper extreme for too long a period of time, or too many unique damper extremes for a period of time and over a specific "refresh" period of time (in this case the length of time for this corner at 130mph) the PSM module interprets this return data as indicative of a damper failure and, as programmed by Stuttgart, it shuts the PSM module down. And the shutdown defaults are all of those individual lockdown and/or lockout settings on the car's systems... for "safety" and legal liability.
Solution? Reflash the PSM's eeprom with greater data guardbands... or don't drive this specific corner faster than 129mph with the current data guardbands.
Just my .18 cents.
Last edited by JohnnyBahamas; 10-28-2009 at 01:33 AM.
10-28-2009, 03:12 AM
#36
Three Wheelin'
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wow, interesting dilemma.
the difficulty with modding the eeprom is that you may inadvertently override some other situation. potentially, it's just a time code and you can lengthen it.
i assume it doesn't shut down right at 130mph but after a specified time at that bank and at 130?
mike - you're having some buzzard luck with that car. very sorry to hear.
the difficulty with modding the eeprom is that you may inadvertently override some other situation. potentially, it's just a time code and you can lengthen it.
i assume it doesn't shut down right at 130mph but after a specified time at that bank and at 130?
mike - you're having some buzzard luck with that car. very sorry to hear.
10-28-2009, 08:13 PM
#37
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10-28-2009, 08:25 PM
#38
10-30-2009, 02:35 AM
#41
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10-30-2009, 02:36 AM
#42
Race Director
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10-30-2009, 02:37 AM
#43
Race Director
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10-30-2009, 07:35 PM
#45
Race Director
Thread Starter
Sebring is very bumpy and my car skips sideways all over the place but never had a PSM issue on Sebring...so I think it is the combo of the steep banks and the bumps in the banking.
What really agrivates me is Porsche was the only car with this issue at Daytona. Vipers, Vette's, Audi R8, BMW's and so forth, not a single issue. I always thought or wanted to think Porsche was the perfect street/track car...guess not.