How does the elec-TRON R3 differ from the elec-TRON R1?

The elec-TRON R1 is a purely electronic system; all damping control runs through the solenoid valve and PASM with no manual compression adjustment. The elec-TRON R3 adds an isolated high and low speed manual compression circuit alongside the solenoid valve, giving drivers a fixed base compression setting that can be adjusted independently for road or track use without interfering with the electronic damping side.

How does the manual compression adjustment on the elec-TRON R3 work alongside PASM?

The two systems operate on separate circuits. The manual compression adjustment sets a base level of compression stiffness at each end of the car, which stays fixed until you change it. PASM then works within that baseline, making real-time damping adjustments through the solenoid valve as normal. Adjusting the manual circuit for track use doesn't disable or override the electronic control.

Can the Nitron elec-TRON R3 be revalved or adjusted after purchase, and are custom spring rates available?

Yes on both. Every Nitron elec-TRON R3 kit is fully serviceable and can be revalved or rebuilt by Nitron. Custom spring rates are available at the time of order; contact us directly before ordering if your intended use or setup calls for something outside the standard specification.

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Description

Nitron elec-TRON R3 Coilover Kit for 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S

The Nitron elec-TRON R3 coilover kit for the 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S combines electronic damping control through Nitron’s proportional solenoid valve with independent manual compression adjustment, giving drivers and engineers control over both the active and mechanical sides of the damping setup simultaneously. The system integrates directly with Porsche’s PASM electronic damping system; no additional controller is required. Hose mounted reservoirs front and rear allow for straightforward independent adjustment of high and low speed compression, while PASM handles overall damping in real time through Nitron’s valve hardware. The kit is built for drivers who want to extract the most from these AWD and turbocharged variants on road or track, where damping precision across all four corners has a direct impact on how the car puts power down and responds through corners. Every kit is custom built, custom sprung, and fully serviceable.

elec-TRON

Nitron’s elec-TRON system is built around a proprietary proportional solenoid valve fitted to each shock individually on the 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S, working in conjunction with Porsche’s PASM electronic damping system. G-load, vehicle speed, road conditions, and driver inputs are all monitored simultaneously, with damping adjustments made every 5 milliseconds. A human eye blink takes somewhere between 100 and 150 milliseconds; the elec-TRON system is working at a fraction of that. The suspension is responding to the road and the driver in real time, not reacting after the fact.

Integration with OEM Electronic Systems

The Nitron elec-TRON R3 installs as a direct bolt-in replacement on the 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S, integrating with Porsche’s PASM system without modification. PASM continues to operate as intended, retaining full factory damping system functionality, just with significantly more capable hardware doing the work underneath the car. No additional controller is required.

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 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S; they engineer one around each platform. Every application goes through a dedicated development process where components, spring rates, and damping characteristics are shaped by the specific variant, not carried over from something similar enough to work. The geometry, weight distribution, and suspension travel of each model 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

Hose reservoir type
No manual damping adjustments are required, fully controlled by the solenoid valve
Preload adjuster
Full alloy body
Consists of 4 coilovers, reservoirs, hoses, and adjustable top mounts
Hand made to order

Specifications

Coilover Type: elec-TRON R3
Reservoir Type: Hose
Rear Suspension Type: OEM
Droplinks Included: No

Applications

Porsche 911 Carrera 4: 997.1, 997.2 | 2005-2013
Porsche 911 Carrera 4 GTS: 997.1, 997.2 | 2011-2013
Porsche 911 Carrera 4S: 997.1, 997.2 | 2005-2013
Porsche 911 Turbo: 997.1, 997.2 | 2006-2008, 2010-2013
Porsche 911 Turbo S: 997.2 | 2010-2013

Other Suspension Kits for 997 C4 / C4 GTS / C4S / Turbo / Turbo S

Notes

Works with Porsche PASM so no additional products are required
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 R3 differ from the elec-TRON R1? The elec-TRON R1 is a purely electronic system; all damping control runs through the solenoid valve and PASM with no manual compression adjustment. The elec-TRON R3 adds an isolated high and low speed manual compression circuit alongside the solenoid valve, giving drivers a fixed base compression setting that can be adjusted independently for road or track use without interfering with the electronic damping side.
How does the manual compression adjustment on the elec-TRON R3 work alongside PASM? The two systems operate on separate circuits. The manual compression adjustment sets a base level of compression stiffness at each end of the car, which stays fixed until you change it. PASM then works within that baseline, making real-time damping adjustments through the solenoid valve as normal. Adjusting the manual circuit for track use doesn’t disable or override the electronic control.
Can the Nitron elec-TRON R3 be revalved or adjusted after purchase, and are custom spring rates available? Yes on both. Every Nitron elec-TRON R3 kit is fully serviceable and can be revalved or rebuilt by Nitron. Custom spring rates are available at the time of order; contact us directly before ordering if your intended use or setup calls for something outside the standard specification.

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 R3 Coilover Kit for 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S [NTCPO026ER3]

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Nitron elec-TRON R3 Coilover Kit for 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S

elec-TRON

Integration with OEM Electronic Systems

Specialized Bi-Axis Hose Fittings

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for 997 C4 / C4 GTS / C4S / Turbo / Turbo S

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews