BC Racing's DS Coilover system, featuring digressive valving, inherits the excellent qualities of the BR Type model, making it an ideal option for individuals seeking coilovers with a track-oriented bias. The digressive piston design introduces a non-linear damping curve, enabling increased low-speed damping to manage body roll during cornering, acceleration, and braking. Simultaneously, it reduces high-speed damping to permit wheel travel when navigating over curbs, preventing the full impact from transferring into the vehicle's structure and preserving overall car balance.
| Corner Weight Adjustment |
Height Adjustment |
Damping Adjustment |
| The adjustable lower spring platform of BC Racing coilovers offers the flexibility to fine-tune the vehicle's setup for corner weighting, achieving an optimal balance and maximizing tire efficiency. To enhance performance, it’s important to ensure equal weight distribution on both tires within each axle—front and rear. This balanced setup allows each tire to contribute equally during cornering, improving grip, boosting cornering speed, and reducing lap times. Optional assister springs can be used for further customization by allowing precise adjustment of wheel droop. |
The ride height is adjusted by moving the coilover’s bottom mount up or down along the damper body. This provides a wide range of height customization without affecting spring preload. Since height is adjusted independently of the spring platform, you retain full damper travel regardless of your chosen ride height—ensuring consistent performance and comfort across a range of setups. |
The DS coilovers feature 30 levels of damping adjustment, combining rebound and compression in a single easy-to-use adjuster. This allows you to fine-tune the suspension to suit specific driving conditions and preferences. Adjusting the front and rear damping balance can shift the car’s handling characteristics—for example, increasing rear damping relative to the front promotes oversteer for a more agile, responsive feel. |
| Pillowball (Rose Joint) Upper Mount |
Camber Adjustment |
Corrosion Protection |
| Many BC Racing Coilovers are equipped with pillowball upper mounts made from anodized and bead-blasted aluminium alloy for a high-quality, durable finish. These Japanese-manufactured pillowballs eliminate the flex or play typical in rubber mounts, resulting in sharper handling, better suspension response, and overall performance gains. |
If your vehicle allows camber adjustment, BC Racing coilovers come with camber-adjustable aluminium pillowball top mounts. These use the same premium Japanese pillowball as the fixed version but allow you to dial in camber to suit road, track, or drift applications—giving you better alignment control and grip balance. |
BC Racing dampers are constructed from black-chromed steel for long-lasting durability in even the harshest European winters. Aluminium components (like top mounts and locking collars) are anodized, while steel lower mounts undergo electrophoretic treatment followed by powder coating. Random monthly salt spray testing ensures every batch meets the highest standards for corrosion resistance.
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| Patented Concave Lower Locking Collar |
High Quality Coil Springs |
High Quality Oil |
| Coilovers rely on a locking collar to keep the bottom mount secure. If this mount loosens, the damper body can shift downward, lowering ride height on that corner and compromising handling—a common issue with many coilovers. BC Racing solves this with a patented concave lower locking collar that features a beveled edge designed to seat into a matching bevel in the bottom mount. This dramatically increases contact surface area and prevents the collar from loosening over time. |
All BC Racing coilovers use SAE9254 high-strength, cold-wound steel for their springs. This premium material ensures excellent durability and consistent performance under load. Each spring is compression tested through more than 500,000 cycles and shows less than 5% deformation, proving their long-term reliability even under demanding use. |
BC Racing uses only high-quality oil in their dampers to maintain stable damping performance over time. This oil resists thermal breakdown and degradation, ensuring long-lasting consistency whether you're daily driving or pushing hard on track. Paired with a sophisticated shim stack design, the dampers provide precise control of compression and rebound under all conditions. |
| Nitrogen Pressurised Dampers |
Bearing Mounted Upper Spring Platform |
Optional Upgrades |
| Under extreme use—like track driving or bumpy high-speed roads—dampers can suffer from oil aeration and cavitation, causing foam that reduces viscosity and weakens the damping effect. While high-quality oil helps, BC Racing adds nitrogen pressurization to the dampers. The nitrogen applies consistent pressure on a floating piston, significantly reducing aeration and improving damping consistency. It also adds a small effective spring rate to enhance overall damper performance. |
As a coilover compresses, the spring twists slightly, creating friction between the spring and its seats. If not reduced, this leads to binding, wear, and even loosening of the spring platform or locking collars—potentially causing uneven ride height or spring dislocation. It also increases steering resistance. BC Racing's bearing-mounted upper spring platform minimizes stiction, improving steering feel and allowing the spring and damper to operate smoothly and as intended. |
Damper adjuster extenders: Save time accessing rear damping knobs—available in 110mm, 200mm, and 250mm. Assister spring perch: Lets you fine-tune droop or add an extra spring for setup flexibility. Multiple spring rates available. Pillowball top mount upgrade: For applications with rubber mounts, this upgrade removes unwanted flex and sharpens handling for a more direct, performance-focused feel. |
