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About BC ER Series Coilover Kits

BC Racing The ER Series - External Reservoir

Race Tuned Coilovers

BC Racings premium flagship coilovers are the external reservoir ER Series with separate compression and rebound damping adjustment. The ER Series coilovers bring with them the high quality and unique features seen on the BR and RM type 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. With higher spring rates and stiffer damper valving (with the option of race damping) these kits are perfect for all kinds of tarmac motorsport and are regularly seen on serious track day cars, World and UK Time Attack Series and many world wide drift formulas.

Features of the BC Racing ER Series:
  • Inverted monotube damper bodies
  • Pillowball upper mount
  • Camber adjustable top mounts
  • Aluminium top plates
  • 30 way adjustable damping
  • Separate compression and rebound damping
  • Adjustable spring platform
  • Height adjustment via bottom mount to retain full damper travel
  • Bearing mounted upper front spring platform
  • Dust boot to protect damper seals
  • Some features are dependent on model
External reservoir

The external reservoir ER Series coilovers allow BC Racing to increase the oil capacity of the damper unit. The additional oil capacity reduces peak oil temperatures which decreases variations in damping rates due to oil viscosity changes. The reduction in damping rate variations improves handling and ultimate on road and track performance.

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.

So now you know about the specific of the BC ER Series coilover kits, click through to learn more about the other features of BC Coilovers that cover the whole range or if you are ready to view the kits available for your car:

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