PSM Maps

[Ray S (Chicago)]

I recently read (on another message board) that PSM had different "maps" that it uses according to perceived driver skill. The way it was explained on the other board was as follows;

"And believe it or not, PSM is adaptive--the better you drive the longer of a leash it will give you--correspondingly, drive like a ham-fisted fool, and PSM will really clamp down on you."

I know that Tiptonic (in auto mode) uses different maps to chose shift points, however I did not think this was true of PSM.

Does anyone here know the answer???

Edited January 8, 2006 by Ray S (Chicago)

[Loren]

The DME learns certain aspects of driving habits but not PSM. That is, not directly - PSM makes changes based on DME input (as well as ABS, engine speed sensors, rotational (lateral acceleration) sensor, steering angle sensor and brake pressure sensor). To my knowledge you can not change any map in the PSM system.

[umn]

...

Does anyone here know the answer???

The answer is no. Some years ago there was an article in the Autotechnische Zeitschrift, where Porsche explained the workings of PSM. As far as I remember PSM mainly kicks in if the system thinks that the slip angle at any wheel exceeds 8 degrees.

There are systems around that let you choose when PSM kicks in by providing two alternative mappings. IMHO not a bad idea.

Incidentally, Horst von Saurma, who holds most of the Nurburgring lap records in Porsches, told me that on an 8-minute lap the difference between PSM on and off is only about 5 seconds.

Cheers

Uwe