How does the elec-TRON R1 interact with BMW's EDC on the G29 Z4?

The Nitron elec-TRON R1 coilover kit integrates directly with the G29 Z4's Electronic Damping Control as a bolt-in replacement. The factory EDC system continues to operate exactly as designed, with the Nitron hardware now doing the actual damping work. No additional controller, wiring modification, or recalibration is required; the factory interface stays fully intact.

Is the elec-TRON R1 suitable for a car used on both road and track?

Yes. The elec-TRON R1 coilover kit for the G29 Z4 and A9x GR Supra is developed from the same hardware platform as Nitron's R3 race kit, and the real-time damping adjustment means the suspension responds to what the car is doing rather than being locked to a setting chosen before the drive. The pre-installed damping maps cover road and track contexts, and the system adapts continuously within whichever map is active.

Does fitting the elec-TRON R1 affect any factory driver assistance systems on the Z4 or GR Supra?

On the G29 Z4, the elec-TRON R1 integrates with BMW's EDC directly, so factory driver assistance systems that interact with the damping system continue to operate normally. On the GR Supra, the kit runs through the Nitron DCU rather than the Toyota factory system, so OEM damping-related functions are replaced by the Nitron setup. Neither fitment requires modification to unrelated chassis or safety systems.

Nitron elec-TRON R1 Coilover Kit for G29 BMW Z4 / A9x Toyota GR Supra

The Nitron elec-TRON R1 coilover kit for the G29 BMW Z4 and A9x Toyota GR Supra brings electronic damping control to both platforms through Nitron’s proportional solenoid valve, integrated directly with the car’s existing damping control system. On the Z4, the kit connects to BMW’s Electronic Damping Control without requiring an additional controller; the factory EDC interface remains fully intact. On the GR Supra, the kit operates through Nitron’s own Digital Control Unit, included with the kit, which manages the solenoid valve independently of the Toyota factory system. Coilover and divorced rear suspension configurations are both available for the Z4; the GR Supra is divorced rear only. Adjustable top mounts and race springs are included across both applications, covering a broad adjustment range drawn from the same hardware platform as the R3. The elec-TRON R1 doesn’t carry independent compression adjustment or remote reservoirs, but the core componentry traces directly back to proven race-derived hardware, and on a chassis like the G29 Z4 or A9x GR Supra, where the engineering foundation is already strong, the kit gives the suspension the precision to match it without adding unnecessary complexity.

elec-TRON

The elec-TRON R1 coilover kit for the G29 Z4 and A9x GR Supra uses Nitron’s proportional solenoid valve fitted to each shock individually, giving independent damping control at every corner simultaneously. On the Z4 the system integrates directly with BMW’s Electronic Damping Control; no additional controller required. On the GR Supra it runs through the Nitron Digital Control Unit, included with the kit.
- Integration with OEM Electronic Systems: The Nitron elec-TRON R1 goes in as a direct bolt-in replacement on the G29 Z4, picking up the existing EDC integration without any modification needed. Factory functionality stays intact; EDC continues to operate exactly as designed, with significantly more capable hardware now doing the actual work.
- Standalone Electronic Damping System: The Nitron DCU is included with the elec-TRON R1 kit for the A90 and A91 GR Supra. It’s the brain behind the elec-TRON system, transforming a conventional passive damper setup into a precision semi-active platform. Working in conjunction with Nitron’s elec-TRON valve, the DCU continuously processes data from the car every 5 milliseconds; assessing vehicle attitude, braking forces, cornering loads, and acceleration inputs to determine the correct valve position and damping level at any given moment. The result is a suspension system that isn’t set to a fixed damping rate but is constantly optimizing grip and performance in real time based on what the car is actually doing. The DCU is fitted with an adjustable control knob giving the driver access to a range of pre-installed damping maps; Rain, Tour, Sport, and Race; each tuned for a specific driving context. Damping continues to be adjusted continuously within whichever map is selected, so the driver sets the overall character and the system handles the rest.
  - Supplied with a custom or universal wiring harness
  - Utilizes Arm Cortex-M4 processor
  - Independent control of 4 electronic dampers
  - 6 position rotary control switch or visual rotary display and control allows user to access a number of pre-installed damping maps (3 passive / 3 adaptive)
  - Two 3 axis accelerometers
  - 3 axis gyroscope
  - 200Hz damping control rate
  - Configured for application location and settings
  - Ideal for resto-mod applications
  - Fully resin bonded

Coilover vs Divorced Rear Suspension

The G29 Z4 elec-TRON R1 is available with two rear suspension configurations depending on how the car is being built. The coilover setup combines the spring and damper into a single unit, keeping things compact and straightforward for road and general track use. The divorced configuration separates the spring and damper, allowing each to be positioned and tuned independently; this is the preferred approach for dedicated race builds where maximizing suspension geometry and setup flexibility matters more than packaging simplicity. Nitron offers both to make sure the elec-TRON R1 works with the build rather than against it.
The A90 and A91 GR Supra elec-TRON R1 is available in the divorced rear suspension configuration only. The divorced setup separates the spring and damper, allowing each to be positioned and tuned independently rather than packaging both into a single coilover unit. This suits the GR Supra’s rear suspension geometry and gives dedicated builds the setup flexibility to extract the most from the platform without compromising damper positioning or spring rate tuning.

Unique Technology

Nitron builds every shock around precision components that go through a thorough design and development process long before final assembly. The modular construction gives engineers the room to develop each application properly on its own terms, without cutting corners on part quality or how components work together under load. Everything is machined to tight tolerances and inspected individually by trained technicians; quality control isn’t a final step here, it runs through the entire process. New materials, finishes, and processes are validated extensively before they’re brought into production, with proprietary Nitron technologies woven throughout to produce shocks that hold up against the competition on both road and track. That level of engineering discipline is what the brand has been built on.
- Basic Damper Design:
  1. End Eye / Top Mount
  2. Damper Piston & Shim Stack
  3. Shaft / Rod
  4. Floating / Separator Piston
  5. Suspension Oil
  6. Compressed Nitrogen Gas

Bespoke Engineering

Nitron doesn’t start with a generic damper and work backward from there. Every application is developed from the ground up, with components, spring rates, and damping characteristics determined by the specific platform rather than borrowed from something adjacent. The geometry, weight distribution, and suspension travel of the chassis shape the design from the start, not as corrections added later. That’s what separates a kit engineered for this car from one that was simply made to fit it.

Features

Coilover or divorced rear suspension types
Shares core technology with the R3 kit
No manual damping adjustments are required, fully controlled by the solenoid valve
Internal reservoir type
Full alloy body
Preload adjuster
Nitrogen gas charged
Precision bearing spacers supplied as required
Works with BMW’s EDC system
Nitron DCU included on GR Supra configuration
Consists of 4 coilovers, and adjustable top mounts
Hand made to order

Specifications

Coilover Type: elec-TRON R1
Rear Suspension Types:
- G29 Z4:
  - Coilover
  - Divorced
- A90 / A91 GR Supra:
  - Divorced
Droplinks Included: No
Recommended Spring Rates:
- G29 Z4:
  - FRS – Fast Road Spec:
    - Front: 343lbs/inch (60N/mm)
    - Rear:
      - Coilover: 300lbs/inch (53N/mm)
      - Divorced: 799lbs/inch (140N/mm)
- A90 / A91 GR Supra:
  - FRS – Fast Road Spec:
    - Front: 343lbs/inch (60N/mm)
    - Rear: 799lbs/inch (140N/mm)
  - TDS – Track Day Spec:
    - Front: 457lbs/inch (80N/mm)
    - Rear: 913lbs/inch (160N/mm)

Applications

BMW Z4 M40i: G29 | 2019-2026
BMW Z4 sDrive20i: G29 | 2019-2026
BMW Z4 sDrive30i: G29 | 2019-2026
Toyota GR Supra: A90, A91, MK5 | 2020-2026

Other Suspension Kits for G29 Z4 / A9x GR Supra

NTR-R1 Coilover Kit
NTR-R1 Coilover Kit w/ Standalone FAL (A90 / A91 GR Supra only)
NTR-R3 Coilover Kit
NTR-R3 Coilover Kit w/ Standalone FAL (A90 / A91 GR Supra only)
elec-TRON R1 Coilover Kit w/ Standalone FAL (A90 / A91 GR Supra only)
elec-TRON R3 Coilover Kit
elec-TRON R3 Coilover Kit w/ Standalone FAL (A90 / A91 GR Supra only)

Notes

Works with BMW’s EDC system, no additional products are required for proper use
Nitron DCU included for A90 / A91 GR Supra configuration
Compatible on 2.0L and 3.0L GR Supra models
Custom spring rates also available, please contact us directly here for more information or for a consultation on custom rates
Images used for illustration purposes only. Specific details, finishes and end fittings may differ from that shown.

Frequently Asked Questions

How does the elec-TRON R1 interact with BMW’s EDC on the G29 Z4? The Nitron elec-TRON R1 coilover kit integrates directly with the G29 Z4’s Electronic Damping Control as a bolt-in replacement. The factory EDC system continues to operate exactly as designed, with the Nitron hardware now doing the actual damping work. No additional controller, wiring modification, or recalibration is required; the factory interface stays fully intact.
Is the elec-TRON R1 suitable for a car used on both road and track? Yes. The elec-TRON R1 coilover kit for the G29 Z4 and A9x GR Supra is developed from the same hardware platform as Nitron’s R3 race kit, and the real-time damping adjustment means the suspension responds to what the car is doing rather than being locked to a setting chosen before the drive. The pre-installed damping maps cover road and track contexts, and the system adapts continuously within whichever map is active.
Does fitting the elec-TRON R1 affect any factory driver assistance systems on the Z4 or GR Supra? On the G29 Z4, the elec-TRON R1 integrates with BMW’s EDC directly, so factory driver assistance systems that interact with the damping system continue to operate normally. On the GR Supra, the kit runs through the Nitron DCU rather than the Toyota factory system, so OEM damping-related functions are replaced by the Nitron setup. Neither fitment requires modification to unrelated chassis or safety systems.

About Nitron Suspension

Nitron Suspension has been at the forefront of precision suspension engineering since 1998, founded by Guy Evans with the goal of building high-performance shocks for enthusiasts and professionals alike. Over 200 dealers now carry Nitron products across Europe, Asia, the US, Australasia, and Africa. In 2008, the company moved into a dedicated facility in the UK’s Motorsport Valley, adding dynamometers, 5-axis CNC machines, and 3D CAD capabilities to support both growing demand and continued product development. A second expansion came in 2023 with a new office in Murrieta, California. The team behind every Nitron product draws from deep backgrounds in machining, materials technology, hydraulics, bike engineering, and F1 racing, with many engineers bringing firsthand experience as competitive drivers and riders. That depth of knowledge across both the technical and competitive sides of motorsport shapes every product Nitron develops.

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Nitron elec-TRON R1 Coilover Kit for G29 BMW Z4 / A9x Toyota GR Supra [NTCTO013ER1]

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