For the next generation hard user, we’ve developed the Function-X Series. The Function-X is now born and is currently the most popular race application amongst the ZEAL line-up. With advanced damping capabilities in effect, our efforts have recently focused towards our new X-Coil Hyper Spring. Through consistent and progressive research and experience, we’ve improved spring quality to achieve an even smoother and more responsive feel and ride. The ability to grasp precise road data has improved. The X-Coil spring achieves exactly this. Our Dynamometer Data proves this with stable rebound and compression levels (within a 0.1 Meter Per Second range) for level travel at very low speeds, very high speeds, and everything in between. By keeping very detailed, precision spring motion in mind, we are able to set the shock’s piston valving to superior levels. The combination of the shock and spring is superior. Our Linear Spring Motion with no Friction Loss is superior and the shock can be adjusted very precisely (Function-X includes 30-Way Damping Adjustability), thus the setting levels have broadened and can be fine-tuned with advanced precision and feel. Lightweight aluminum upper mounts, spring seat preload and spring seat locks, height-adjustable lower brackets and lock seats (for non-strut type applications) include a durable, Alumite finish for rust proof characteristics. Steel shell casing includes a special chromate plating for rust proof characteristics also. Adjustable brackets are newly designed and slender. Driving feel is amazing for the hard-user. MacPherson Strut-Type systems are specifically produced as an inverted-monotube type.

The Function-T completely eliminates the usage of hexavalent chrome with the shell casing now being produced with a nickel boron plating. Different from existing chrome plating products, it is much more anti-corrosive and practically eliminates the spring seat seizing to the adjustable brackets. Optional X-Coils-R springs utilize the new found performance of the Function-T. Both 6 and 30 levels of adjustment are available. Custom spring rates are available for your own custom Function coilovers.*Coilover overhaul performed in-house at our facilities in California.

The typically delicate aluminum body has instead achieved high rigidity due to the Function-A’s nickel boron plating, increasing resistance to abrasion and high temperatures. The low frictional properties of boron also allow a more direct damping action. Optional X-Coil-R springs utilize the newfound performance of the super light weight Function-A. Both 6 and 30 levels of damping adjustment are available. Custom spring rates are available for your own custom Function coilovers.

*Coilover overhaul performed in-house at our facilities in California.

The Super Function series is a popular track-spec coilover kit designed for use with S-Tire compounds. The series consists of five types: A, B, C, D, E. Depending on the vehicle and type of driving, a user can choose from five different types of Super Function coilovers to best suit their needs. The upper mount is a pillow-ball type and the damper case is made of lightweight heat-resistant aluminum. Experience direct suspension feel and less unsprung weight. Recommended for track only applications.

Type-A: 6 levels of damping adjustment
Type-B: 30 levels of damping adjustment
Type-C: 6 levels of compression, 6 levels of rebound adjustment
Type-D: 6 levels of compression, 30 levels of rebound adjustment
Type-E: 30 levels of compression, 30 levels of rebound adjustment*Coilover overhaul performed in-house at our facilities in California.