I have this annoying noise when driving my car, at any speed (even at 5mph, clutch depressed so engine is at idle) when the car drivers over uneven surfaces (and by uneven I even mean uneven parts of very good tarmac, very very small ripples you would not even notice were it not for this noise). It sounds resonated. Normally when you drive over some ripples/potholes you get a dry "thunk" from the suspension, but here it sounds like someone taps on a small bongo (-->
http://www.gope.net/Produtos/BongoNovo.gif) (it keeps on resonating for a little while). What I don't get it is it even happens at very low speeds. When going faster and having bigger ripples it sounds louder. When driving at constant speed you can hear it nearly all the time ( something like toomtomtomtoomtooomtomtomtomtomtooomtomtom, ok this looks ridiculous, but how to describe a sound?
)
It is a 2007 Cayman S with 20k miles and standard (non
pasm) suspension and a
PSE exhaust.
Anyone experienced the same?
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PASM - Porsche Active Suspension Management
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This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM |
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Linear Mode
