BC RACING COILOVERS ZR SERIES - BMW 3 SERIES E90 05-11

The BC Racing ZR Series is a true 3-way adjustable coilover system designed for serious track use, offering performance and adjustability normally found only in far more expensive motorsport dampers. Each ZR kit provides completely independent high-speed compression, low-speed compression, and rebound adjustment, allowing precise control over chassis behaviour in every phase of a corner.

As with other BC Racing motorsport-grade kits, the ZR Series offers full ride height adjustment independent of spring preload and piston travel. Applications using MacPherson struts feature inverted monotube dampers with a Teflon-coated braided line connecting the damper to the external reservoir, which can be mounted in the engine bay or boot for convenience.

Key Features

• Digressive piston and damping curve
• 3-way damping control (high-speed compression, low-speed compression, rebound)
• 30 clicks of rebound adjustment
• 20 clicks of low-speed compression adjustment
• 12 clicks of high-speed compression adjustment
• Ride height adjustment independent of spring preload
• Inverted damper design (vehicle dependent)
• Dual piston system (one piston in the reservoir, one in the damper)
• Teflon-coated braided reservoir lines (inverted models)
• Solid stems for double A-arm applications
• Tapered bottom mount locking collar
• Pillowball top mounts
• Dust boots to protect damper seals
• Custom spring rates available
• Spare parts available with short lead times
• 1-year manufacturer warranty

Spring Rate Options

The ZR Series is engineered for high-level motorsport and aggressive track use, where fine chassis control and heat stability are critical. The Recommended spring rate offers a strong baseline suitable for most circuit setups and tyre compounds.

Higher spring rates can be selected for cars running slicks, substantial aero, or heavily stiffened chassis. Softer spring rates may be used for lighter cars, low-grip circuits, or when balancing mechanical compliance with aero load.

If you need help choosing the right spring rate based on track layout, tyre choice, or vehicle setup, feel free to get in touch and we’ll advise on the best option.