BC Racing ER Series - BMW 3/4 Series F80 F82 M3 M4 (2014-2018) (5-Bolt Top Mount) (True Rear Coilover)

PLEASE NOTE THE IMAGE IS FOR ILLUSTRATION PURPOSES ONLY IF YOU REQUIRE SPECIFIC NEEDS SUCH AS TOP MOUNTS THEN PLEASE CONTACT US TO CONFIRM BEFORE ORDERING

BC Racing ER Series True Rear Coilovers – BMW F80 M3 / F82 M4 5-Bolt Top Mount

The BC Racing ER Series True Rear Coilovers for the BMW F80 M3 and F82 M4 with the 5-bolt front top mount are an advanced track-focused suspension upgrade designed for drivers looking for independent damping control, external reservoirs and a true rear coilover conversion.

The ER Series features 2-way adjustable damping, allowing compression and rebound to be tuned independently. Combined with external reservoirs and the True Rear layout, it provides a highly adjustable suspension platform for serious fast-road, track and competition-focused F8X builds.

Why choose BC Racing ER Series True Rear for your F80 M3 or F82 M4?

The F80 M3 and F82 M4 are highly capable performance platforms, and the ER Series is aimed at owners who want more detailed suspension control than a conventional single-adjustable coilover can provide.

Independent compression and rebound adjustment allows the suspension to be developed around tyre choice, spring rates, alignment, vehicle weight and circuit conditions.

The True Rear configuration replaces the factory-style divorced rear spring and damper arrangement with a complete rear coilover assembly, while the external reservoirs provide additional oil capacity for demanding use.

Key Features

• BC Racing ER Series True Rear coilovers
• BMW F80 M3 and F82 M4 application
• 5-bolt front top mount fitment
• True rear coilover conversion
• Rear spring mounted around the damper
• 2-way adjustable damping
• Independent compression adjustment
• Independent rebound adjustment
• External remote reservoirs
• Increased damper oil capacity
• Improved heat management during sustained use
• Monotube damper design
• Adjustable ride height
• Rebuildable damper design
• Application-specific spring rates
• Custom spring-rate options available
• Adjustable top mounts where applicable
• Designed for serious fast-road and track use

True Rear Coilover Conversion

The main difference between this kit and a conventional F80 M3 / F82 M4 ER Series setup is the rear suspension configuration.

The factory rear suspension uses a divorced layout, with the spring mounted separately from the damper.

With the True Rear configuration, the rear spring is mounted concentrically around the damper to create a complete rear coilover assembly.

This provides a more conventional motorsport-style rear suspension layout and can make spring changes and setup development more straightforward on track-focused cars.

Independent Compression & Rebound Adjustment

The defining feature of the ER Series is its independent 2-way damping adjustment.

Compression adjustment controls how the damper responds as the suspension compresses, while rebound controls how the suspension extends again afterwards.

Being able to adjust these separately gives experienced drivers and suspension specialists greater control over how the F80 M3 or F82 M4 behaves under braking, acceleration, cornering and changing track conditions.

This allows the suspension to be developed more precisely around tyres, spring rates and geometry.

External Reservoirs

The ER Series uses external reservoirs as part of its advanced damper design.

The additional oil capacity helps manage temperatures generated during repeated damper movement and sustained hard driving.

For F80 M3 and F82 M4 builds that regularly see longer track sessions, this can help maintain more consistent damping behaviour as temperatures rise.

Important 5-Bolt Top Mount Fitment

This kit is intended specifically for F80 M3 and F82 M4 models using the 5-bolt front top mount configuration.

BMW used different front top-mount arrangements across F8X applications, so the mounting pattern should always be confirmed before ordering.

A 5-bolt application should not be assumed to be interchangeable with the 3-bolt version.

If you're unsure which configuration your vehicle uses, check the front strut top mount or contact us before ordering and we can help identify the correct kit.

BMW F80 M3 / F82 M4 Track Suspension

The ER Series True Rear provides a highly adjustable platform for developing the F8X chassis around serious performance use.

Independent compression and rebound control can be configured alongside upgrades such as:

• Performance tyres
• Adjustable suspension arms
• Uprated anti-roll bars
• Polyurethane or solid bushes
• Chassis braces
• More aggressive alignment settings

For track-focused builds, professional alignment and corner weighting can help make full use of the available suspension adjustment.

Adjustable Ride Height

The BC Racing ER Series True Rear allows the ride height of your F80 M3 or F82 M4 to be tailored around both appearance and performance requirements.

For fast-road cars, this allows the vehicle to sit lower with a more purposeful stance.

For track-focused setups, ride height should be considered alongside suspension geometry, available damper travel, alignment and corner weighting rather than simply lowering the vehicle as far as possible.

Choosing Your Spring Rate

Spring-rate selection is particularly important with a True Rear F8X setup.

Because the rear spring acts at a different point in the suspension compared with the factory divorced arrangement, conventional rear spring rates should not be directly transferred to a True Rear configuration.

The correct rear spring rate should instead be selected specifically for the True Rear layout.

Factors to consider include:

• Vehicle weight
• Tyre compound and width
• Road or track use
• Alignment
• Anti-roll bars
• Chassis modifications
• Circuit characteristics
• Driver preference

For serious track builds, spring rates and damper settings should ideally be considered together as part of the complete chassis setup.

If you're unsure which ER Series specification is best suited to your F80 M3 or F82 M4, contact us before ordering and we can help you choose the right setup.

Important True Rear Considerations

A True Rear coilover places the rear spring load through the damper mounting location rather than the original factory spring location.

Because this changes how suspension loads are transferred into the chassis, the condition and suitability of the relevant mounting points should be considered before installation.

This is particularly important on track and competition-focused F8X builds where suspension loads can be considerably higher than during normal road use.

Professional installation and regular inspection of the rear damper mounting points and surrounding chassis are recommended.

DS Series vs ER Series

The DS Series uses digressive damping with combined damping adjustment, making it a strong choice for fast-road and track-focused use.

The ER Series takes adjustability further by allowing compression and rebound to be tuned independently, while also adding external reservoirs.

For drivers who want greater control over suspension balance and more scope for track-specific setup changes, the ER Series is the more advanced option.

Maintenance & Servicing

The ER Series is a rebuildable high-performance suspension system and should be maintained accordingly.

The dampers, external reservoirs, hoses, adjusters and mounting hardware should be kept clean and inspected regularly, particularly on cars used frequently on track.

Following BC Racing's recommended servicing procedures will help maintain consistent damping performance and maximise the service life of the suspension.

F80 M3 / F82 M4 Compatibility

This BC Racing ER Series True Rear kit is intended for applicable BMW F80 M3 and F82 M4 models using the 5-bolt front top mount configuration.

Please confirm your exact vehicle and suspension setup before ordering, particularly if the suspension has previously been modified.

If you're unsure whether this is the correct application, contact us and we'll help you identify the appropriate kit.

What's Included?

The BC Racing ER Series True Rear kit is supplied as a complete coilover suspension package for the applicable BMW F80 M3 / F82 M4, including the front coilovers, True Rear rear coilover assemblies, springs, external reservoirs and relevant adjustable components.

Exact top-mount, spring-rate and reservoir specifications can vary depending on the selected configuration.

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