Join Date: May 2009
Location: Hong Kong
County: Yuen Long New Territories
After some more search on web. I wonder if this is because o4' SW fit with "Self-leveling system". While I search on Koni web-site, it state that the FSD is for 156 exclude "Self-leveling system".
Self leveling system:
"...Finally, the New Alfa Sportwagon can also be fitted with a Boge-Nivomat self-levelling hydropneumatic rear suspension to ensure constant ride height regardless of the weight transported.
Whenever the load alters, the system automatically adjusts the resistance offered by the rear suspension to restore the car to a preset level. In this way, the car maintains the same excellent performance (roadholding, stability and comfort) under all service conditions.
The 'Nivomat' is activated by kinetic energy generated by wheel movements in response to road surface roughness. When the New Alfa Sportwagon luggage compartment is unloaded, the car's rear goes down like that of any other car. After a few hundred metres, however, the system lifts the body and restores it to the original ride setting, which remains constant while the car is moving and even with the engine off (for 8-10 hours). In technical terms, the device operates as follows: the relative movement of rear axle and body pumps fluid form a high pressure reservoir inside the 'Nivomat' damper. The oil compresses gas bearings that stabilise pressure during loading and while the car is motion. When the car achieves an optimum ground clearance, a by-pass is automatically activated to maintain the clearance by allowing excess fluid to flow out into a low pressure reservoir from where it is recycled.
When a 'Nivomat' is fitted, a headlight alignment adjuster is naturally not required because the light beam is always at the correct angle. "