2-way damping force adjustment feature for FS2 combines 16-level comp./rebound simultaneous adjustment and 16-level comp. adjustment alone, to offer broad adjustable range for greater setting capabilities to meet wide varieties of driving situations/conditions.

Upward jolting and repeated bouncing, driving over a bump. It takes a while to stabilize.

The impact is absorbed; no bouncing and rapid stabilization.

In regular shock absorbers, bump rubber is vital to avoid damage from bottoming out. Unfortunately it causes instability, because when a large impact compresses it, energy thus amassed is released upwards.

FS2 however uses the Hydraulic Bump Stopper to convert the impact to thermal energy and absorb it. This strongly reduces the shock, and there's no repulsion force.

In shock absorbers with inactive or no H.B.S., the operative valve (green) floats, and oil flows freely through the base valve ports. Resistance to the flow from the shim stack then, causes damping force.

Near full compression, when the piston rod strokes beyond a predetermined point, the operative valve is pushed down and activates H.B.S.: the base valve ports are narrowed, blocking the oil flow. This results in high damping force.

A relief valve serves to suppress sudden damping force increase, when the pressure in the cylinder exceeds its regular level.

The setup of the H.B.S. mechanism is optimized per vehicle model, with the right activation point and damping force.

To avoid damages/breakages, conventional bump rubbers must also be fitted/used with H.B.S.-equipped dampers.

Lower brackets on strut type suspensions come with camber angle adjustment feature. Camber angle can be adjusted by rotating the eccentric washer 180°. This feature can enable camber angle adjustment, even if it can not be adjusted with the upper mounts.

*Except some models (e.g. strut with inset type brackets)

For some vehicle models with insert-type struts, eccentric sleeves are used to enable camber angle adjustments. By rotating the sleeves, camber angle can be adjusted to either negative or positive, from the standard position.

An easy-to-install mount, exclusively designed for each vehicle model, is included in the product kit.
For some vehicle models which do not have mount plates, original mounts are used.

We have devised a suitable mount for each vehicle type.
Pillow ball upper mounts for front strut suspensions feature camber adjustment.*

The ride height can be adjusted by moving the lower spring seat up or down.
Characteristic of this system is its simple structure and ease of use.

Compared to the regular mono-tube system, twin-tube attains longer stroke with a smaller repulsive force, resulting in high ride comfort.

Like most TEIN shock absorbers, FS2 can be overhauled to restore its original performance.
During overhaul, we also offer revalving service: you can have the damping force setup updated to suit your preferences.

The EDFC Series offer easy damping force adjustment from the driver's seat.*
* Some vehicle models are not compatible