07-14-2008, 02:47 PM
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Site Supporter
500 post club
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Join Date: Jul 2006
Posts: 943
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Quote:
Originally Posted by zoomee
I had an interesting experience yesterday at an autocross. I was mixing runs with and without the PSM on and at the start of one of the runs I thoroughly confused the tiptronic controller. At the start I always put the trans in manual mode and select first gear. I then floor it and let the tiptronic shift into second at redline. On a run with the PSM off the car would not shift into second. Instead it got into the rev limiter and started cutting the engine power  . I had to manually shift into second using the rocker switch. Needless to say it was not my fastest run which was done with the PSM on. The event never repeated itself.
As a side note, I finished third in my class beating out a number of modified Boxster S's and 911's. My Goodyear Eagle F1 Asymetrics may not be the grippiest tires but do a fairly decent job and it looks like they'll last forever. I also did a DE event in the rain with these tires and they are AWESOME in the wet. |
Obviously you didn't put the pedal all the way down, otherwise it would've upshifted automatically regardless PSM on or off. But do you have a solution to delay the engine cutting power off at higher rpm?
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PSM - Porsche Stability Management
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While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility. |
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