How does the R3 justify the step up from the R1 on the FD3S?

The R1 uses a single combined adjuster for compression and rebound. The R3 separates high speed compression, low speed compression, and rebound into three independent circuits with 16, 26, and 24 clicks respectively. On a car as sensitive to setup as the FD3S, that separation lets you address a specific handling characteristic without affecting everything else at once. You can tune for a particular circuit or surface without the adjustment trade-offs that come with a combined system.

What is the difference between the Fast Road and Track Day spring rate specs?

The Fast Road spec is tailored for drivers who push hard on the road and want improved chassis response without giving up daily usability. The Track Day spec steps up the spring rates and is for drivers running the car regularly on circuit where body control and consistency under load take priority. Both use the same R3 damper hardware; the difference is in the spring rates.

How does the FD3S's weight distribution factor into the R3 setup?

The front and rear spring rates are deliberately asymmetric and are calibrated around the FD3S's specific geometry and near 50/50 weight balance from the start of Nitron's development process. The split between front and rear reflects what the car actually needs, not a generic starting point that was adjusted to fit.

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Description

Nitron NTR-R3 Coilover Kit for FD Mazda RX-7

The Nitron NTR R3 Coilover Kit for the FD3S Mazda RX-7 is built for drivers and engineers who want to properly develop the car’s setup across different circuits and conditions. The FD3S’s front mid-engine layout and near 50/50 weight distribution reward a suspension that can be tuned with real precision rather than dialed in by approximation, and the R3 is built for exactly that level of work. Independent 3-way damping adjustment with separate high and low speed compression control gives the range needed to address specific handling characteristics without trade-offs. Piggyback reservoirs front and rear keep high and low speed compression adjustment accessible at both ends without adding complexity to the installation. A large diameter piston and ultra-strong piston rod sit at the core of the design, providing the damping control and feedback that serious setups depend on. The R3 is a proven race winner with lap records across a wide range of international motorsport formulas, and every kit is custom built, custom sprung, and fully serviceable.

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 FD3S Mazda RX-7; 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 FD3S 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

Piggyback reservoir types
16 clicks of high compression
26 clicks of low compression
24 clicks of rebound
Preload adjuster
3-way independent adjustment
Full alloy body
Consists of 4 coilovers, reservoirs, and top mounts
Hand made to order

Specifications

Coilover Type: NTR-R3
Adjustment Type: 3-way independent
Adjustment: 16 clicks of high compression / 26 clicks of low compression / 24 clicks of rebound
Reservoir Type: Piggyback
Rear Suspension Type: OEM
Droplinks Included: No
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 550lbs/inch (96N/mm)
  - Rear: 500lbs/inch (88N/mm)
- TDS – Track Day Spec:
  - Front: 800lbs/inch
  - Rear: 650lbs/inch

Applications

Mazda RX-7: FD | 1993-2002

Other Suspension Kits for FD RX-7

NTR-R1 Coilover Kit

Notes

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 R3 justify the step up from the R1 on the FD3S? The R1 uses a single combined adjuster for compression and rebound. The R3 separates high speed compression, low speed compression, and rebound into three independent circuits with 16, 26, and 24 clicks respectively. On a car as sensitive to setup as the FD3S, that separation lets you address a specific handling characteristic without affecting everything else at once. You can tune for a particular circuit or surface without the adjustment trade-offs that come with a combined system.
What is the difference between the Fast Road and Track Day spring rate specs? The Fast Road spec is tailored for drivers who push hard on the road and want improved chassis response without giving up daily usability. The Track Day spec steps up the spring rates and is for drivers running the car regularly on circuit where body control and consistency under load take priority. Both use the same R3 damper hardware; the difference is in the spring rates.
How does the FD3S’s weight distribution factor into the R3 setup? The front and rear spring rates are deliberately asymmetric and are calibrated around the FD3S’s specific geometry and near 50/50 weight balance from the start of Nitron’s development process. The split between front and rear reflects what the car actually needs, not a generic starting point that was adjusted to fit.

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 NTR-R3 Coilover Kit for FD Mazda RX-7 [NTCMA010R3]

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Nitron NTR-R3 Coilover Kit for FD Mazda RX-7

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for FD RX-7

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews