COMMODORE Sedan RWD 1997-06 VT-VZ

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

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.

Damping adjustment

By tweaking front and rear damping you can adjust the way the car handles. Increasing damping force on the rear relative to the front, for example, will start moving the vehicle into a more oversteer orientated stance.

If you want to go drag racing in a rear wheel drive car then you want the back of the car to squat off the line to maximise weight transfer to the rear and therefore onto the rear tyres. This maximises traction and helps prevent wheel spin. To achieve this you would soften the rear dampers to allow faster compression. If you had the rear dampers set to hard, as you might run the car on a race track, then the car would be less inclined to squat so traction would be reduced.

Conversely, if you want to go drifting and are finding it hard to break traction and are having problems with understeer then making the rear dampers harder will help reduce traction whilst making the front dampers softer will give greater front traction. This will make the rear of the car looser whilst minimising understeer thus altering the vehicles handling characteristics more towards drift than drag, road or track.

Specs *

Front Spring Rate   62-170-7KG

Rear Spring Rate    62-160-9KG

* Linear valving

* 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

Disclaimer: Please note that operational noises such as knocks and squeaks from track-oriented products such as pillow ball top mounts and track-oriented coilovers such as the DS, RM, ER, HM or ZR models is a normal characteristic and  NOT covered by warranty.

May Not be Actual Model Shown In Photo 

* Supplied Spring Rates may differ from advertised 

** Please note that not all vehicles use camber plates in the front and/or rear. Some vehicles reuse OEM upper mounts.