Cusco Sport TN_R: Dual Adjustable Competition Mono-Tube Coilover
The Cusco Sport TN_R represents the pinnacle of the Sport Series coilover range for track and competition use. Taking the Sport R as its foundation, the TN_R introduces Cusco's proprietary Twin Needle valve technology, which enables fully independent control of compression and rebound damping through two separate dials. The result is an extraordinarily precise setup tool for drivers who tune in milliseconds and need their suspension to respond exactly as intended under every load condition. The TN_R is designed exclusively for competition use with track-dedicated tires and makes no concessions for street comfort. Every set is assembled in Japan in ISO 9001 and ASEA certified facilities.
Twin Needle technology explained
Traditional single-adjust dampers control compression and rebound through a shared valve path, meaning any adjustment affects both simultaneously. The Twin Needle system introduces a dedicated rebound-specific valve body fluid path, isolating the two forces entirely. Compression is controlled by a red dial, rebound by a blue dial, both accessible from the same end of the damper with no tools required. With 24 steps in each direction, a total of 576 distinct damper settings are available, enabling fine compensation for braking loads, turn-in response, lateral forces, corner exit traction, and changes in fluid temperature or component wear over time.
Technical specifications
| Feature | Details |
|---|---|
| Damper type | Mono-tube, large capacity piston |
| Damper adjustment | Twin Needle dual adjustment — 24-step compression (red dial) and 24-step rebound (blue dial), fully independent. 576 total settings possible. |
| Adjustment access | Both dials located at the same end of the damper — no tools required, no need to remove components |
| Stroke | Limited to track use variables — fluid and gas volume maximised as a result |
| Front strut layout | Inverted ram-type strut cartridge for maximum rigidity under load. Camber control lower key-bolt included. |
| Upper mounts (strut type) | Aerospace-grade ball-jointed rigid upper mounts with camber adjustment included. Optional caster and camber control upper available. |
| Upper mounts (multi-link / double wishbone) | Fixed rigid racing mounts supplied |
| Springs included | Cusco original Blue Springs — double shot peened with anti-sagging construction. Custom spring rates available at time of order. |
| Corrosion protection | Anti-corrosion treatment — 500 hour salt spray tested |
| Manufacturing standard | ISO 9001 and ASEA certified, assembled in Japan |
Intended use
| Discipline | Suitable |
|---|---|
| Track and circuit competition (R-compound tires) | Yes, primary design target |
| High-speed open track (HSPD) | Yes |
| Autocross | Yes |
| Street use | Not recommended, the TN_R is a competition-only configuration with no street comfort compromises. See the TN_S for a street-capable dual adjustable alternative. |