KONI’s new FSD technology: how does it work?

What you see is a special valve, which is able to control an oil flow parallel to the one going through the piston. The FSD feature, giving a rise in damping force almost linear to the time that the piston is moving in one direction, closes this parallel oil flow.

In standard shock absorbers the main damping characteristic
is defined by the oil flow going through the piston assembly.

Combining it with the FSD feature, KONI added a special valve, which controls an oil flow parallel to the one going through the piston rod. This parallel oil flow is closed by the FSD feature, giving a rise in damping force almost linear to the time that the piston is moving in one direction.

Put simply: the FSD feature is a hydraulic amplifier that delays the build up of pressure. One could say that an extra tuning option has been created in order to get the best possible combination of handling and comfort.
Since it is an integrated part of the hydraulic valve system inside the damper, no additional cables, sensors or any other electronic devices are needed to operate an FSD damper.

FSD is the simplest and most economic way to significantly improve the ride and driving characteristics of every car. Certainly in comparison with costly systems which work on the basis of computer technology, complex electronics and sensors.