Adjustable coilover is a damper made of adjustable coil spring, shock absorber and damper seal. It is called height adjustable coilovers just because there is a comber plate, shape like a circle around by teeth, to adjust height. The date of a coilover is shown as following:
1. Spring stiffness. Its unit is kg/mm which indicates how much kilogram power needed to compress per millimeter.
2. Damping coefficient.
The spring stiffness of a good coilover, firstly, should be strong enough to support the car relative weights containing the braking weight and shift weight in turning. Then the damping coefficient of a good coilover should be large enough to dampen spring repetitive motion. A whole adjustable coilover is able to adjust spring stiffness, height of coilover, the tension and damping. And practicing on channel is the only way to adjust a coilover reaching the perfect situation.
The following ways come from my personal experience about simple adjustment and means of distinguish. At first, we should understand several concepts:
1. The higher of spring seat, the harder in spring performance, at opposite, it becomes softer. Adjusting spring seats will change the car height as a certain ratio (absolutely not same ratio).
2. The coilover will reach perfect performance, only when damping coefficient fits for spring
3. The larger damping coefficient doesn’t mean better. Too much damping courses less space for spring, so that body bumps severely.
4. Spring coefficient doesn’t being influenced by adjusting coilover height.
5. The difference in height, from lifting to falling, is 10 millimeter. After apply the braking several times, it recovers the normal height.


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