BC Racing ZX Series - BMW 3/4 Series F80 F82 M3 M4 (2014-2018) (5-Bolt Top Mount) (True Rear Coilover)
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BC Racing ZX Series True Rear Coilovers – BMW F80 M3 / F82 M4 5-Bolt Top Mount
The BC Racing ZX Series True Rear Coilovers for the BMW F80 M3 and F82 M4 with the 5-bolt front top mount are an advanced 3-way adjustable suspension system designed for serious track and competition-focused use.
The ZX Series allows low-speed compression, high-speed compression and rebound to be adjusted independently, giving experienced drivers and suspension specialists a high level of control over chassis behaviour. Combined with external reservoirs and a True Rear conversion, it provides a highly developed suspension platform for demanding F8X builds.
Why choose BC Racing ZX Series True Rear for your F80 M3 or F82 M4?
The F80 M3 and F82 M4 are highly capable performance platforms, and the ZX Series is aimed at owners who want a much more advanced level of suspension control than conventional single- or 2-way adjustable coilovers can provide.
Its independent 3-way damping adjustment allows the chassis to be developed around braking behaviour, cornering balance, tyre grip, spring rates, alignment 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 rear suspension layout.
Key Features
- BC Racing ZX Series True Rear coilover suspension
- BMW F80 M3 and F82 M4 application
- 5-bolt front top mount fitment
- 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
- Increased damper oil capacity
- Improved heat management during sustained use
- Monotube damper design
- Adjustable ride height
- Rebuildable suspension system
- Application-specific spring rates
- 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 ZX 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 dedicated track cars.
3-Way Damping Adjustment
The defining feature of the ZX Series is its independent 3-way damping adjustment.
The suspension allows separate adjustment of:
- Low-speed compression
- High-speed compression
- Rebound
Low-speed compression influences 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 controls how quickly the suspension extends again after compression.
This gives the ZX Series significantly greater setup flexibility than conventional single- or 2-way adjustable suspension systems.
External Reservoirs
The ZX 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 circuit use.
For F80 M3 and F82 M4 builds that regularly see longer track sessions, this can help maintain more consistent damping behaviour as temperatures increase.
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 ZX Series True Rear provides a highly adjustable platform for developing the F8X chassis around serious performance use.
Its 3-way damping control can be configured alongside upgrades such as:
- Performance or motorsport 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 can help make full use of the available suspension adjustment.
Adjustable Ride Height
The BC Racing ZX 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 fast-road builds, this allows the stance and arch gap to be adjusted while improving chassis response.
For track-focused setups, ride height should be considered alongside suspension geometry, 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
- 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 chassis setup.
If you're unsure which ZX Series specification is best suited to your F80 M3 or F82 M4, contact us before ordering and we can help you choose the right configuration.
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.
ER Series vs ZX Series
The ER Series provides independent compression and rebound adjustment with external reservoirs.
The ZX Series takes adjustability further by separating compression damping into low-speed and high-speed adjustment, alongside independent rebound control.
For highly developed F80 M3 and F82 M4 track builds, the ZX Series provides greater scope to fine-tune chassis behaviour around specific tyres, circuits and driving conditions.
Maintenance & Servicing
The ZX 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 ZX 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 ZX 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, reservoir and damper specifications can vary depending on the selected configuration.
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