Does the Nitron Z4 elec-TRON R1 coilover kit need a separate controller?

No. It's built to integrate directly with BMW's factory EDC system through the factory wiring harness, so no aftermarket controller is needed.

What's the difference between the divorced and coilover rear options?

Divorced rear springs keep the factory load path intact and cut friction by removing sideload from the damper, and it's the recommended default. The coilover rear mounts spring and damper together.

Is manual adjustment available on this kit?

Manual adjustment isn't required since the solenoid valve works through the factory EDC system to handle damping automatically, but the kit still shares its adjustable hardware with the passive NTR-R1.

Does this kit include adjustable camber plates?

Yes. Every kit ships with adjustable camber plates and spherical top mounts for precise alignment correction, along with race springs.

What's the difference between this kit and the passive NTR-R1?

The NTR-R1 is a passive kit relying entirely on manual adjustment, while the elec-TRON R1 adds a solenoid valve integrated with BMW's EDC system for automatic damping control.

Can custom spring rates be ordered?

Yes. Every kit is custom built to order, and custom spring rates beyond the standard setup are available by contacting us directly.

Description

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BP PRICING DIFFERENCE

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Description

Nitron elec-TRON R1 Coilover Kit for G29 BMW Z4

Nitron’s Z4 elec-TRON R1 coilover kit takes the adjustable camber plates, spherical top mounts, and race springs of the NTR-R1 and adds a proportional solenoid valve at each corner that’s fully compatible with BMW’s factory EDC system, so damping adjusts in real time without an aftermarket controller bolted in somewhere. The G29 shares its bones with the Toyota Supra, running a strut front end and a multi-link rear on a near-perfect 50:50 weight distribution, and this kit installs directly into the factory wiring harness rather than working around it. A choice of rear suspension configuration carries over from the passive kit, a divorced rear spring setup that keeps loads running through the factory-intended paths and cuts sideload-related friction, or a true coilover rear for owners who want spring and damper mounted together. Every kit includes adjustable camber plates, spherical top mounts, and race springs, and it’s custom built and fully serviceable.

elec-TRON

Each shock carries its own proprietary proportional solenoid valve, giving the system a dynamically controlled bypass instead of a single fixed valving. Because it’s built to work with BMW’s factory EDC system, the solenoid valve responds to the same inputs the factory system already monitors, adjusting damping in real time without needing a separate aftermarket controller wired in alongside it.

Integration with OEM Electronic Systems

The Nitron Z4 elec-TRON R1 coilover kit goes in as a direct bolt-in replacement on the G29, picking up the existing EDC integration without any modification needed. Factory functionality stays intact, EDC continues to operate exactly as designed, just with significantly more capable hardware now doing the actual work.

Coilover vs Divorced Rear Suspension

Rear suspension on the Nitron Z4 elec-TRON R1 kit comes down to the same choice between divorced and coilover as the passive kit. The front stays coilover on every build since that’s how the G29’s front strut mounts, and the electronic damping control up front works the same way regardless of what’s happening at the rear. Divorced rear separates the spring from the damper entirely, keeping loads running through the factory-intended paths and cutting the friction that comes from sideload on the damper, and it’s the setup Nitron recommends by default. Coilover rear keeps the spring and damper together as one unit for owners who want that more traditional layout. Nitron offers both because not every Z4 owner wants the same rear suspension packaging, and neither the EDC integration up front nor the driving style behind it changes that.

Unique Technology

Nitron builds every shock in this Z4 elec-TRON R1 coilover kit from precision components that go through a rigorous design and development process before final assembly. Modular construction gives Nitron’s engineers the flexibility to work through this platform properly instead of cutting corners on how parts are made or how they perform together under real load. Everything is machined to tight tolerances and checked individually by trained technicians, and that quality control runs through the whole process rather than sitting at the end of it.
- 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 engineers the Z4 elec-TRON R1 coilover kit around this specific chassis and its strut front and multi-link rear geometry, not a generic BMW platform assumption carried over from another model. The divorced rear spring option keeps the factory load path intact and reduces friction by removing sideload from the damper, while the coilover rear option available with the Track spring package gives owners who want a more traditional setup that choice instead of a single fixed configuration. Adjustable camber plates and spherical top mounts let an owner correct alignment precisely instead of guessing at spring perch position, and the valving is developed specifically around the G29’s weight distribution and suspension travel instead of treating adjustment as an afterthought.

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
Consists of 4 coilovers, adjustable top mounts, and droplinks
Hand made to order
Compatible with BMW’s EDC system, no additional products needed for function

Specifications

Coilover Type: elec-TRON R1
Rear Suspension Types:
- Coilover
- Divorced
Droplinks Included: No
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 343lbs/inch (60N/mm)
  - Rear:
    - Coilover: 300lbs/inch (53N/mm)
    - Divorced: 799lbs/inch (140N/mm)

Applications

BMW Z4 sDrive20i: G29 | 2019-2026
BMW Z4 sDrive30i: G29 | 2019-2026
BMW Z4 M40i: G29 | 2020-2026

Other Suspension Kits for G29 Z4

Notes

Compatible with BMW’s EDC system, no additional products needed for function
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.
Precision bearing spacers supplied as required

Frequently Asked Questions

Does the Nitron Z4 elec-TRON R1 coilover kit need a separate controller? No. It’s built to integrate directly with BMW’s factory EDC system through the factory wiring harness, so no aftermarket controller is needed.
What’s the difference between the divorced and coilover rear options? Divorced rear springs keep the factory load path intact and cut friction by removing sideload from the damper, and it’s the recommended default. The coilover rear mounts spring and damper together.
Is manual adjustment available on this kit? Manual adjustment isn’t required since the solenoid valve works through the factory EDC system to handle damping automatically, but the kit still shares its adjustable hardware with the passive NTR-R1.
Does this kit include adjustable camber plates? Yes. Every kit ships with adjustable camber plates and spherical top mounts for precise alignment correction, along with race springs.
What’s the difference between this kit and the passive NTR-R1? The NTR-R1 is a passive kit relying entirely on manual adjustment, while the elec-TRON R1 adds a solenoid valve integrated with BMW’s EDC system for automatic damping control.
Can custom spring rates be ordered? Yes. Every kit is custom built to order, and custom spring rates beyond the standard setup are available by contacting us directly.

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.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Nitron elec-TRON R1 Coilover Kit for G29 BMW Z4 [NTCBM039ER1]

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Nitron elec-TRON R1 Coilover Kit for G29 BMW Z4

elec-TRON

Integration with OEM Electronic Systems

Coilover vs Divorced Rear Suspension

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for G29 Z4

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews