07-16-2008, 10:29 AM
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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
Okay, I confess. I now officially belong to the Did Not Read The Manual Club.
Page 169 in the 2006 manual states:
"If the PSM is switched off and/or Sport mode is
switched on, an automatic upshift does not occur
when the engine speed limit is reached."
However, I will state that on other occasions when I have turned off the PSM I am pretty sure that I have gotten an automatic upshift.
This would imply that the Softronic will be able to overrride the rev limiter on tiptronic cars but would only be useful when the PSM is turned off. I guess the only thing to do is to perform some controlled experiments on some deserted roads to verify the PSM function.
PS. it doesn't matter what the throttle position is as the rev limit can be reached at half throttle in first gear. |
I have tested the PSM off, it will upshift as long as you kickdown. No kickdown then no auto upshift. And for Tip power still cuts off at about 7200rpm regardless of PSM on or off. It would be great if somehow we can figure out how to raise that limit beyong 7200rpm.
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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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