RedShift Comp 1W Coilovers 2003-08 BMW Z4 (E86/E85) [RI-12-COMP1W]

RedShift Comp 1W Coilovers — custom built and race valved at RedShift, with every attention to damping detail.

RedShift Comp 1W Coilovers for the 2003-08 BMW Z4 (E86/E85) are meant for one thing: to win. They include all springs, mounts, height adjusters and adjustment tools — nothing additional to purchase. The 1W dampers are single-adjustable, moving compression and rebound together, which is the right way to build a high-performance coilover of this type: the damping balance and curves stay correct as grip changes with temperature and track conditions.

Our coilovers use a different balance and shape of compression and rebound damping than typical street coilovers: digressive compression and linear rebound for maximum grip. Compression is tuned to do more of the work controlling the sprung mass, which reduces dive under braking, sharpens turn-in and makes it far easier to feel the car and hit your marks. Rebound is made linear (and relatively lighter than street coilovers) so the tire stays planted under braking, at turn-in, mid-corner and on the drive wheels at exit.

Valving (select above): Street Comp 1W — competition curves with a street-friendly balance · Comp 1W — full race valving · 2-Way Remote Adjustable and 3-Way Remote Adjustable — remote-reservoir dampers with independent compression (and high-speed compression) adjustment, built to order.

Specifications

• Dampers: monotube, 32-way damping adjustable — front 53-200-99-20-M12 / rear 45-275-150-12-M12 (dia-body-travel-shaft-thread, mm)
• Standard spring rates: 447 lb/in(F) / 447 lb/in(R)
• Spring lengths: 7.09"(F) / 6.3"(R)
• Top mounts: Pillow Ball Camber Plate(F) / With standard top mounts (R)
• Body length / travel: 7.88"(F) / 10.83"(R) / 3.9"(F) / 5.9"(R)
• Ride height: full-length threaded body, independent height and preload adjustment

RedShift recommended spring rates (kg/mm, front/rear)

Comfort: 6f/8r · Sport: 8f/10r · Performance: 10f/12r · Track: 12f/14r · Race: 14f/16r

Not sure which to pick? Tell us how you drive the car and we’ll recommend rates — no charge.

Springs: choose any spring rate at no charge. Swift springs are special order only for now. RedShift dampers are rebuildable and every part is available separately for fast service, during the warranty period and beyond.

Warranty: All RedShift coilovers are for off-road use only and may never be installed on vehicles that will be driven on public roads or highways. RedShift coilovers are covered by our 2-year warranty on ALL parts of the kit — springs, spherical bearings, mounts, dampers, everything. The warranty is available to the original purchaser only.