A hydraulic shock absorbers
Advantages: simple structure, low cost.
Disadvantages: life is shorter, easier to recession.
Characteristics: Usually found in the original low-cost vehicles coilovers or a lower price on the road version coilovers for sale, because the design is just a whole branch of internal damping oil barrel body, and could easily lead to a large amount of bubbles caused by driving continuous operation faithful damping recession.

Second, oil and gas separation design
Advantages: simple structure, good heat dissipation.
Disadvantages: Parts and production of high precision, high development costs.
Characteristics: the use of free-piston high-pressure hydraulic oil and methane gas each compartment in a room, use of gas compression promote free piston actuation, hydraulic oil damping force generated by the cylinder core hole on the bottom of the damper.

Third, the oil and gas hybrid design
Pros: Durable, suitable for mass production.
Disadvantages: complex structure, the damper piston with easy.
Features: Using binoculars structural design, the use of hydraulic oil out of the bottom of the inner cylinder and the cylinder core back pressure valve on the bottom hole damper damping force generation, low-pressure gas reservoirs above the outer tube, the use of hydraulic oil flow generated resistance.

Damping, height adjustable coilovers feature introduced with fixed
To cope with changes in the terrain and road conditions at any time on the field, the shock from the original suit in the form of added damping and height adjustable hard and soft features, and these special configuration has become an indispensable choice modification family.

A damping adjustable
A soft and hard damping function began to appear in the court, primarily the need to cope with the fierce competitions and road conditions change from, but in recent years, becoming generally loved by the owners, in fact, it can be both comfort and handling, and with different number of kilograms of spring do timely adjustments. Kudan to have adjustable damping S13 200SX coilovers Bilstein PSS9, its work is the use of a rotary valve piston, adjusting the amount of oil flowing through the working piston, with a fixed upper and lower ends of the working piston spring washer, so that owners set their own given the desired damping.

Second, height adjustable Hi-Lo Kit
The most talked about cash performance fan favorite Hi-Lo Kit shock absorbers, as the name suggests is that you can freely adjust the height of the shock absorber tube, adjustment method is the use of a spring seat moves up and down to adjust the position, his design is provided in the base thread, driven by the rotating bed springs up or down, to lower or raise the purpose of the body. In addition to the above-described vehicle-height adjusting coilovers includes an outer, there is a groove cut in the barrel, and the C-shaped snap ring coupled with the fixed base of the C ring; of course, C-shaped ring also has a plurality of vehicles style card slot, but that only periodic change vehicle height, it is possible to do in mm thread trimming unit type, is the real Hi-lo Kit design.
Three, fixed
The main emphasis on comfort and yet enhance the handling, hard and soft, spring pounds with a body height and damping are coming after a long period of testing. Usually it's a little damper setting than the original upgrade, due to the use of large volumes coiled spring style, did not like the straight road back volumes Hi-Lo Kit springs with shock absorbers are less direct, and in order to meet the daily driving of vehicles . Replace the rear wheel arches and the distance between the tires still have two to three finger width or so, does not affect the daily running while still enhance handling, quite suitable for entry-level modification owners do choose.