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

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. The R1 is the cleaner, simpler setup; the R3 gives more hands-on control over the mechanical side of the damping.

Can the Nitron elec-TRON R1 be revalved or adjusted after purchase, and are custom spring rates available?

Yes on both. Every Nitron elec-TRON R1 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 Fast Road Spec.

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Description

Nitron elec-TRON R1 Coilover Kit for 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S

The Nitron elec-TRON R1 coilover kit for the 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S integrates directly with Porsche’s PASM electronic damping system, adding Nitron’s proprietary proportional solenoid valve to each shock for precise, independent damping control at every corner. No additional controller is required; PASM manages the system as it always has, now through significantly more capable hardware. The hardware traces directly back to the R3 platform, so what you’re getting is proven race-derived componentry packaged into a more accessible, straightforward setup; one that works particularly well on these AWD and turbocharged variants, where the additional front axle load and power delivery demands make damping precision matter across all four corners simultaneously. Every kit is custom built, custom sprung, and fully serviceable.

elec-TRON

The elec-TRON R1 for the 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S integrates with Porsche’s PASM electronic damping system rather than replacing it. Each shock carries its own proprietary proportional solenoid valve, giving PASM precise, independent damping control at every corner simultaneously. The system monitors g-load, vehicle speed, road conditions, and driver inputs all at once, making damping adjustments every 5 milliseconds. For reference, a human eye blink takes somewhere between 100 and 150 milliseconds. The suspension is reacting to what the road and the driver are doing in real time, not catching up after the fact.

Integration with OEM Electronic Systems

The Nitron elec-TRON R1 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.

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 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S shape the design from the start, not as corrections added later. That’s what separates a kit engineered for these cars from one that was simply made to fit them.

Features

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 and adjustable top mounts
Hand made to order

Specifications

Coilover Type: elec-TRON R1
Rear Suspension Type: OEM
Droplinks Included: No
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 400lbs/inch (70N/mm)
  - Rear: 799lbs/inch (140N/mm)

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 R1 differ from the elec-TRON R3? 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. The R1 is the cleaner, simpler setup; the R3 gives more hands-on control over the mechanical side of the damping.
Can the Nitron elec-TRON R1 be revalved or adjusted after purchase, and are custom spring rates available? Yes on both. Every Nitron elec-TRON R1 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 Fast Road Spec.

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 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S [NTCPO026ER1]

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Nitron elec-TRON R1 Coilover Kit for 997 Porsche 911 Carrera 4, Carrera 4 GTS, Carrera 4S, Turbo, and Turbo S

elec-TRON

Integration with OEM Electronic Systems

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