BC Racing ZR Series - BMW 3/4 Series F80 F82 M3 M4 (2014-2018) (3-Bolt Top Mount) (True Rear Coilover)
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BC Racing ZR Series True Rear Coilovers – BMW F80 M3 / F82 M4
The BC Racing ZR Series True Rear Coilovers for the BMW F80 M3 and F82 M4 are a flagship, motorsport-focused suspension system designed for drivers looking for maximum damping adjustability, premium componentry and a true rear coilover conversion.
The ZR Series features independent low-speed compression, high-speed compression and rebound adjustment, external reservoirs and Swift Springs as standard. Combined with the True Rear layout, it provides one of the most advanced BC Racing suspension platforms available for serious F8X track and competition builds.
Why choose BC Racing ZR Series True Rear for your F80 M3 or F82 M4?
The F80 M3 and F82 M4 are highly capable performance platforms, and the ZR Series is aimed at owners who want the highest level of suspension tuning within the BC Racing range.
Independent 3-way damping adjustment allows the chassis to be developed around tyre choice, spring rates, alignment, vehicle weight, aero and circuit conditions.
The True Rear configuration replaces the factory-style divorced rear spring and damper arrangement with a complete rear coilover assembly, creating a more motorsport-focused suspension layout.
Key Features
- BC Racing ZR Series True Rear coilovers
- BMW F80 M3 and F82 M4 application
- True rear coilover conversion
- Rear spring mounted around the damper
- 3-way adjustable damping
- Independent low-speed compression adjustment
- Independent high-speed compression adjustment
- Independent rebound adjustment
- External remote reservoirs
- Swift Springs supplied as standard
- Advanced monotube damper design
- Inverted damper configuration where applicable
- Adjustable ride height
- Rebuildable suspension system
- Custom spring-rate options available
- Custom damper valving available
- Designed for serious track and competition use
True Rear Coilover Conversion
The main difference between this kit and a conventional F80 M3 / F82 M4 ZR 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 gives the rear suspension a more conventional motorsport-style layout and can make spring changes and setup development more straightforward on dedicated track cars.
3-Way Damping Adjustment
The defining feature of the ZR Series is its independent 3-way damping adjustment.
The suspension allows separate adjustment of:
- Low-speed compression
- High-speed compression
- Rebound
Low-speed compression can be used to influence slower chassis movements such as body roll, pitch, braking dive and weight transfer.
High-speed compression controls how the suspension responds to faster damper movements caused by bumps, kerbs and sharper surface changes.
Rebound then controls how quickly the suspension extends again after compression.
This gives experienced drivers and suspension specialists a very wide range of setup possibilities for developing the balance of the F80 M3 or F82 M4.
External Reservoirs
The ZR Series uses external reservoirs as part of its advanced damper design.
The reservoirs increase the available oil volume within the suspension system and form part of the compression damping arrangement.
The additional oil capacity also helps manage temperatures generated during sustained circuit use, helping maintain more consistent damper behaviour throughout longer sessions.
Swift Springs as Standard
The ZR Series is supplied with Swift Springs as standard.
For more specialised F80 M3 and F82 M4 builds, spring rates can be selected around vehicle weight, tyre grip, alignment, aero load and intended circuit use.
Custom spring rates and corresponding damper valving can also be considered where a more developed chassis setup is required.
BMW F80 M3 / F82 M4 Track Suspension
The ZR Series True Rear provides a highly adjustable platform for developing the F8X chassis.
It can be configured to work alongside upgrades such as:
- Performance tyres
- Adjustable suspension arms
- Uprated anti-roll bars
- Polyurethane or solid bushes
- Chassis braces
- Aggressive alignment settings
- Aerodynamic modifications
For dedicated track and competition cars, professional alignment and corner weighting are strongly recommended to make full use of the available suspension adjustment.
Adjustable Ride Height
The BC Racing ZR Series True Rear allows the ride height of your F80 M3 or F82 M4 to be tailored around the intended use of the car.
For serious track builds, ride height should be considered alongside suspension geometry, available damper travel, alignment and corner weighting.
Simply lowering the vehicle as far as possible can compromise suspension travel and geometry, so a performance-focused setup should prioritise chassis behaviour over stance alone.
Choosing Your Spring Rate
Spring-rate selection is especially 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 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
- Aerodynamic load
- Circuit characteristics
- Driver preference
For serious track builds, spring rates and damper valving should ideally be considered together as part of the complete suspension setup.
If you’re unsure which ZR Series specification is appropriate for your F80 M3 or F82 M4, contact us before ordering and we can help you choose a suitable 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.
ZX Series vs ZR Series
Both the ZX and ZR Series provide advanced 3-way damping adjustment with separate low-speed compression, high-speed compression and rebound control.
The ZR Series sits at the more premium, motorsport-focused end of the BC Racing range, with Swift Springs supplied as standard and a specification aimed at highly developed track and competition builds.
For serious F80 M3 and F82 M4 projects where suspension setup is being developed around tyres, spring rates, aero and circuit conditions, the ZR Series is the more specialised option.
Maintenance & Servicing
The ZR Series is a rebuildable motorsport-focused 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 seeing frequent circuit use.
Cars used heavily on track or in competition should be serviced at appropriate intervals to help maintain consistent damping performance and maximise component life.
F80 M3 / F82 M4 Compatibility
This BC Racing ZR Series True Rear kit is intended for applicable BMW F80 M3 and F82 M4 models.
Please confirm your exact vehicle specification and suspension configuration before ordering.
If you’re unsure whether this is the correct True Rear application for your car, contact us and we’ll help you identify the appropriate setup.
What’s Included?
The BC Racing ZR 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, Swift Springs, external reservoirs and relevant adjustable components.
Exact top-mount, spring-rate, reservoir and damper specifications can vary depending on the selected configuration.
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