BC Racing ER Series Coilovers – BMW 540i (G30, RWD) B58

OVERVIEW

The BC Racing ER Series is a motorsport-oriented coilover with 2-way independently adjustable damping — separate compression and rebound circuits — fed by external/remote reservoirs for increased oil capacity and consistent performance under sustained track use. For the RWD G30 540i it offers full-length adjustable ride height and a high level of tuning control for dedicated track and time-attack setups.

SPECS

• 2-way independently adjustable damping (separate compression and rebound)
• External/remote reservoirs for increased oil capacity and fade resistance
• Full-length adjustable ride height — set height independent of spring preload to preserve shock travel
• Mono-tube shock design with T6 aluminum lower mounts
• High-tensile SAE 9254 springs; Swift spring upgrade available
• Front camber plates included where the application allows
• Fully rebuildable and serviceable; 1-year warranty

PARTS INCLUDED

• Set of 4 BC Racing ER Series coilovers with external reservoirs, assembled with springs
• Front upper mounts / camber plates (application dependent)
• Spanner wrenches and damping-adjustment tools
• Installation hardware

TECH RESOURCES

• If your car is equipped with the optional adaptive M / electronic (EDC) suspension, an adaptive damper (EDC) delete or bypass is required to prevent a suspension warning light (not included)
• A professional wheel alignment is required after installation
• Professional installation and corner-balancing are recommended; installation follows the standard BC Racing coilover procedure

PART NUMBER

• I-78-ER

VEHICLE APPLICATIONS