BC RACING ER COILOVERS BMW 4 SERIES F82 M4 14-18 (3-BOLT TOP MOUNT)

This is the kit we recommend for the best balance of performance and comfort, designed by the factory to have the best overall compromise of spring rate, ride height range, top mount design and damping rate to suit the majority of car owners.

It is more than capable of dealing with fast road and track work but also retains a high degree ride civility so the car can still be used for mundane duties and long journeys without the ride becoming tiring.

ER Series

Our External reservoir ER Series comes with separate compression and rebound damping adjustment. The ER Series coilovers bring with them the high quality and unique features seen on the BR Series and RM Series but have the additional benefit of external reservoirs and the ability to allow the end user to individually adjust and set compression and rebound damping rates.

External Reservoir

Our External reservoir ER Series comes with separate compression and rebound damping adjustment. The ER Series coilovers bring with them the high quality and unique features seen on the BR Series and RM Series but have the additional benefit of external reservoirs and the ability to allow the end user to individually adjust and set compression and rebound damping rates.

Key Features

• Digressive piston and damping curve

• 30 clicks of compression adjustment via the external reservoirs

• 30 clicks of rebound adjustment from the top of the damper

• Ride height adjustment separate to spring preload

• Camber adjustable top mounts (depending on model)

• Monotube damper design

• Pillowball top mounts

• Bearing mounted upper spring platform

• Tapered bottom mount locking collar to prevent collar working loose

• Custom spring rates available

• All spare parts available with low lead times

• Dust boot to protect the damper seal

• 1 year manufacturer warranty

Separate compression and rebound damping adjustment

By separating the adjustment for damping compression and rebound the ER Series allows you to dial the vehicle in to your exact needs. When braking hard whilst approaching a corner you want the car to transfer weight to the front tyres to maximise grip for the braking effort and also to allow you to trail brake into the corner without the car understeering.

As you start to lift off the brakes on corner entry you don’t want the suspension to snap back up too quickly as this will remove the loading from the front tyres too quickly and lead to understeer. As soon as the car starts to understeer you need to wind off the steering lock to reduce the work effort applied to the tyres to allow them to regain traction. This slows the vehicles ultimate speed.

The compression damping adjustment allows you to fine tune the way the car rolls onto its front tyres during braking and the separate rebound adjustment allows you to fine tune the way the car responds as you come off the brakes to enter the corner proper and keep the front end hooked up. This allows you to get back on the power sooner and maximise corner exit speed. Corner exit speed is vital because this determines you maximum speed achieved down the next straight.