What does the elec-TRON R3 offer over the elec-TRON R1 on the G29 Z4 and A9x GR Supra?

The elec-TRON R1 relies entirely on the solenoid valve for damping control. The Nitron elec-TRON R3 coilover adds independent manual high and low speed compression adjustment on top of the electronic control, so engineers can set the mechanical baseline of the damping setup while the solenoid valve continues to adjust in real time within that range. It gives the setup a level of tunability that neither a purely electronic nor a purely mechanical kit can match on its own.

How does the elec-TRON R3 interact with BMW's EDC on the G29 Z4?

The Nitron elec-TRON R3 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 handling the actual damping work. No additional controller, wiring modification, or recalibration is required; the factory interface stays fully intact.

What does the Nitron DCU do on the A90 and A91 GR Supra, and is it included?

Yes, the DCU is included with the elec-TRON R3 kit for the GR Supra. It manages Nitron's elec-TRON solenoid valves independently of the Toyota factory system, processing vehicle data every 5 milliseconds across attitude, braking forces, cornering loads, and acceleration inputs to determine the correct damping level at each corner in real time. The driver selects an overall character through one of four pre-installed maps and the DCU handles continuous adjustment within it automatically.

Does the elec-TRON R3 still require setup and adjustment from the driver, or does the electronic system handle everything?

Both. The electronic system adjusts damping continuously in real time without driver input, but the elec-TRON R3 also carries independent high and low speed compression adjusters that set the mechanical baseline the electronics work within. That baseline still needs to be dialed in for the car, circuit, and conditions. The electronic side handles the continuous real-time response; the manual side sets the character and range it operates in.

Is the elec-TRON R3 suitable for a car that also sees regular road use?

Yes. The Nitron elec-TRON R3 coilover kit for the G29 Z4 and A9x GR Supra includes pre-installed damping maps covering road and track contexts, and the real-time adjustment means the suspension responds to conditions as they change rather than being locked to a fixed setting. The custom spring rate options available at order mean the kit can be built around a road and track balance from the start rather than defaulting to a track-only setup.

Nitron elec-TRON R3 Coilover Kit for G29 BMW Z4 / A9x Toyota GR Supra

The Nitron elec-TRON R3 coilover kit for the G29 BMW Z4 and A9x Toyota GR Supra combines electronic damping control through Nitron’s proportional solenoid valve with independent manual compression adjustment, giving drivers and engineers simultaneous control over both the active and mechanical sides of the damping setup. Each shock carries its own solenoid valve. On the Z4, the elec-TRON system integrates directly with BMW’s Electronic Damping Control (EDC) in real time; no additional controller required. On the GR Supra, the system runs through the Nitron DCU, included with the kit. On the Z4, the front units run piggyback reservoirs and the rears use hose-mounted reservoirs; on the GR Supra, the front units are available in either piggyback or hose-mounted configuration with hose-mounted reservoirs at the rear. Coilover and divorced rear suspension configurations are both available for the Z4; the GR Supra runs divorced rear only. The combination of electronic damping control and independent high and low speed compression adjustment gives the elec-TRON R3 coilover a level of tunability that neither a purely electronic nor a purely mechanical kit can match on its own. Adjustable top mounts and race springs are included, and every kit is custom built, custom sprung, and fully serviceable.

elec-TRON

The elec-TRON R3 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 alongside manual compression adjustment. 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 R3 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 alongside the independent manual compression adjustment the R3 adds over the R1.
- Standalone Electronic Damping System: The Nitron DCU is included with the elec-TRON R3 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 R3 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 R3 works with the build rather than against it.
The A90 and A91 GR Supra elec-TRON R3 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.

Specialized Bi-Axis Hose Fittings

Nitron R3 Hose shocks use Nitron’s own 720 degree Bi-Axis fittings exclusively; a proprietary design that makes for clean, precise installation without the compromises that come with conventional end fittings.

Unique Technology

Nitron starts every shock with precision components that go through a thorough design and development process long before final assembly. The modular construction gives engineers the flexibility to approach each application on its own terms, without compromising part quality or how components perform together under real load. Everything is machined to tight tolerances and inspected individually by trained technicians; that standard of quality control runs through every stage of production, not just the end of it. New materials, finishes, and processes go through extensive validation before they’re adopted, with proprietary Nitron technologies built in throughout to produce shocks that consistently hold up against the competition on road and track. That’s the engineering foundation the brand has been built on since 1998.
- 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 adapt a generic damper to fit the G29 Z4 and GR Supra; they engineer one around it. Every application goes through a dedicated development process where components, spring rates, and damping characteristics are shaped by the specific platform, not carried over from something similar enough to work. The geometry, weight distribution, and suspension travel of the chassis are part of the design from day one, not corrections introduced later. That’s the difference between suspension that works with a car and suspension that was purpose-built for it.

Features

Coilover or divorced rear suspension types
Piggyback & hose reservoir types
No manual damping adjustments are required, fully controlled by the solenoid valve
Preload adjuster
Full alloy body
Works with BMW’s EDC system
Nitron DCU included on GR Supra configuration
Consists of 4 coilovers, reservoirs, hoses, and adjustable top mounts
Hand made to order

Specifications

Coilover Type: elec-TRON R3
Reservoir Type:
- G29 Z4:
  - Front: Piggyback
  - Rear: Hose
- A90 / A91 GR Supra:
  - Front:
    - Hose
    - Piggyback
  - Rear: Hose
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
elec-TRON R1 Coilover Kit w/ Standalone FAL (A90 / A91 GR Supra only)
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

What does the elec-TRON R3 offer over the elec-TRON R1 on the G29 Z4 and A9x GR Supra? The elec-TRON R1 relies entirely on the solenoid valve for damping control. The Nitron elec-TRON R3 coilover adds independent manual high and low speed compression adjustment on top of the electronic control, so engineers can set the mechanical baseline of the damping setup while the solenoid valve continues to adjust in real time within that range. It gives the setup a level of tunability that neither a purely electronic nor a purely mechanical kit can match on its own.
How does the elec-TRON R3 interact with BMW’s EDC on the G29 Z4? The Nitron elec-TRON R3 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 handling the actual damping work. No additional controller, wiring modification, or recalibration is required; the factory interface stays fully intact.
What does the Nitron DCU do on the A90 and A91 GR Supra, and is it included? Yes, the DCU is included with the elec-TRON R3 kit for the GR Supra. It manages Nitron’s elec-TRON solenoid valves independently of the Toyota factory system, processing vehicle data every 5 milliseconds across attitude, braking forces, cornering loads, and acceleration inputs to determine the correct damping level at each corner in real time. The driver selects an overall character through one of four pre-installed maps and the DCU handles continuous adjustment within it automatically.
Does the elec-TRON R3 still require setup and adjustment from the driver, or does the electronic system handle everything? Both. The electronic system adjusts damping continuously in real time without driver input, but the elec-TRON R3 also carries independent high and low speed compression adjusters that set the mechanical baseline the electronics work within. That baseline still needs to be dialed in for the car, circuit, and conditions. The electronic side handles the continuous real-time response; the manual side sets the character and range it operates in.
Is the elec-TRON R3 suitable for a car that also sees regular road use? Yes. The Nitron elec-TRON R3 coilover kit for the G29 Z4 and A9x GR Supra includes pre-installed damping maps covering road and track contexts, and the real-time adjustment means the suspension responds to conditions as they change rather than being locked to a fixed setting. The custom spring rate options available at order mean the kit can be built around a road and track balance from the start rather than defaulting to a track-only setup.

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 R3 Coilover Kit for G29 BMW Z4 / A9x Toyota GR Supra [NTCTO013ER3]

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