Speed bump comfort with pdcc

[darrenfx]

ugh there are many in forums that claim PDCC does provide ride comfort advantages on various models. 911 related: https://rennlist.com/forums/992/1164978-pdcc-and-ride-quality.html

this part explains it well. you get low spring rate with active rollbars (PDCC):

Anti-roll bars, all they do is transfer the up or down movement on one side to the other. Turning a corner transfers weight to the outside, the car rolls causing the outside suspension to compress. The anti-roll bar transfers this compression to the other side, pushing the inside up, resulting in less body roll. Not perfectly. Some energy is lost into torsion as the bar twists. Some goes into squishing the bushings holding the bar. This is why the thicker the bar and the more securely its fastened the less the body roll. Compare any GT car, the differences are obvious.

Problem being, the bar is stupid. When the wheel goes up the bar has no way of knowing if its a corner or a bump. It dutifully transmits both equally. But in order to move the other side up it has to overcome the spring on the other side. This has the effect of translating the inside wheel spring rate to the outside wheel. Which happens regardless of whether you want it, as you do for cornering, or don't, like when not cornering hard- ie, most of the time.

PDCC places hydraulics at both ends of the anti-roll bar. The hydraulics can move the bar ends up and down. Not stupidly either, but according to what the car is actually doing. Smart. This allows the car to achieve the low body roll of a stiff bar, with the low spring rate suspension compliance of a smaller bar, both at the same time. Most of the time, straight line, PDCC does nothing, and you enjoy the smooth ride of a car with a soft bar.

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[SergeyIndy]

ugh there are many in forums that claim PDCC does provide ride comfort advantages on various models. 911 related: https://rennlist.com/forums/992/1164978-pdcc-and-ride-quality.html

this part explains it well. you get low spring rate with active rollbars (PDCC):

There is a difference:

PDCC in a 911 uses hydraulics
PDCC Sport in the Taycan uses electromechanical system.