A coilover is an automobile suspension device. “Coilover” is short for “coil spring over shock”. It consists of a shock absorber with a coil spring encircling it. The shock absorber and spring are assembled as a unit prior to installation, and are replaced as a unit when the shock absorber has leaked. This provides for optimal damping without torsional loads.
D2 Racing offers one of the world’s largest variety of coilovers for any car brand and/or model, starting from the Street versions to Super Racing types. Depending on the user’s demands, D2 is able to develop any coilover system, for any car, under any circumstance, whether you use your car on street, track, rally or drift.
The Shock Body
At the heart of the full-bodied coilover is the shock. Like any shock, the coilover’s upper mount connects directly to the chassis while its lower mount connects to its lower A-arm in double wishbone layouts or the knuckle itself in MacPherson strut configurations.
Shocks control unwanted spring oscillations and reduce vibrations caused by the wheels and chassis. When you hit a bump, the suspension’s springs compress and decompress, absorb vibrations and transfer energy to the shocks through their upper mounts, into their pistons. As a result, the shocks dampen the vibrations, making that bump virtually unnoticeable. The degree to which all of this happens depends on the shock’s internals: stiffer shocks slow spring movement while softer shocks do the opposite.
Shocks do more than just reduce vibrations and control spring movement, though; they also eliminate rocking, pitching, dipping, wheel spinning and all sorts of other things that aren’t supposed to happen when turning or stepping on the gas or brake.
Inside the shock lies a hydraulic fluid-filled tube and piston. The piston pushes high-pressure fluid through the shock’s valves, controlling how it responds against the spring. Kinetic energy harnessed through suspension movement turns into heat energy that ultimately dissipates within the shock’s fluid. Valving is based upon small orifices perforated into the shock’s piston that allow hydraulic fluid to bleed through as the piston travels up and down.
Springs are divided in 2 basic types, linear and progressive. A progressive spring has a variable spring rate, depending on the amount of load place on the spring. D2 like OEM vehicles provide linear springs, this means that each spring has a fixed spring rate based on the specific kit they are designed for. The performance are more consistent as the driver can better anticipate the suspension movement.
Each coilover kit has specific spring rates, designed to fit the shocks of the coilovers kits. They have been made to absorb the impact of the road condition. In the combination of the shock absorber, they make sure the tires keep in contact with the road. Their design has been calculated with a high degree of accuracy, using theoretical models.
Pillowball top mount is racing performance product purpose so it is easy to creating some shock noise under some circumstances. Some people do care about the unusual sound made by the pillowball top mount, the pillowball rubber top mount is the best choice as it is able to reduce the unusual sound made by the pillowball top mount.
Combined the handling of pillowball top mount and the comfort of stock top mount.
||P+ / P+R
||Pillowball and Rubber
||No Top Mount
Please note: shape varies depending on car model