The Purest Sports Car of Its Era
When the third-generation Mazda RX-7 (chassis code FD3S) debuted in 1991, it was unlike anything else in the sports car world. While competitors relied on increasingly large and heavy engines, Mazda went a different direction: a compact, lightweight twin-turbocharged rotary engine in a body designed with obsessive attention to aerodynamics and proportion. Mazda's approach was a masterstroke in an era dominated by burgeoning curb weights and power outputs. The RX-7's introduction marked a pivotal moment in the Japanese sports car narrative, with its 50:50 weight distribution setting a new benchmark for driving dynamics.
The result was a car that weighed just 2,800 pounds, made 255 hp (later 276 hp in JDM specification), and handled with a purity that earned near-universal praise from automotive journalists. Over a production run from 1991 to 2002, Mazda built approximately 68,589 FD3S RX-7s, making it the rarest generation of a model that was already niche. In comparison, the previous generation RX-7 (FC3S) saw over 272,000 units produced, underscoring the FD's exclusivity and desirability among enthusiasts today.
The 13B-REW: Engineering Marvel
The heart of the FD is the 13B-REW -- the first mass-produced sequential twin-turbo engine exported from Japan, following the system's 1990 debut in the Japan-only Eunos Cosmo. The Wankel rotary motor displaces 1,308 cc (or 2,616 cc by the "equivalent displacement" method often used for comparison) and uses a sequential turbo system where a primary turbocharger provides boost from low rpm, and a secondary turbocharger joins in at higher rpm for maximum power.
The result is remarkably smooth power delivery with minimal turbo lag -- the sequential system fills the gap that a single large turbocharger would leave. In Japanese domestic market (JDM) specification, the 13B-REW produced 255 PS initially, rising to 280 PS (276 hp, the gentleman's agreement ceiling) in the final Series 8 cars. This engine was capable of revving to an 8,000 rpm redline, with the smoothness that only a rotary can deliver.
The rotary engine's inherent advantages -- compact size, smooth operation, high-rpm capability -- allowed Mazda to mount the engine low and far back in the chassis, contributing to the FD's exceptional weight distribution and low center of gravity. These engineering choices were deliberate, aimed at enhancing the car's agility and responsiveness. The FD's chassis dynamics were further refined by double-wishbone suspension at all four corners, which contributed significantly to its cornering prowess.
Design by Proportion
The FD RX-7's design is often cited as one of the most beautiful in automotive history. Lead designer Yoichi Sato and his team at Mazda created a body with no superfluous elements -- every surface serves an aerodynamic or structural purpose. The drag coefficient of just 0.29 was a testament to the car's sleek, slippery shape, making it not only stunning to look at but also efficient at slicing through the air.
The car's proportions are often described as following the golden ratio, with the relationship between the front overhang, cabin, and rear creating a visual harmony that's immediately recognizable. The flowing lines, rounded headlights, and absence of sharp creases give the FD a timeless quality that has only improved with age. These aesthetic choices were not merely about looks; they were integral to the car's performance, reducing lift and increasing stability at speed.
At just 168.5 inches long and 48.4 inches tall, the FD is remarkably compact. It seats two and prioritizes the driving experience above all else. Inside, the cockpit was designed with the driver in mind, featuring a low seating position and an ergonomic layout that put all controls within easy reach, reinforcing the car's focus on driver engagement.
The Apex Seal Question
No discussion of the RX-7 is complete without addressing the rotary engine's Achilles' heel: apex seal wear. The apex seals are small strips of metal at the tips of the rotor's triangular faces that maintain the seal between the rotor and the housing. They're the rotary equivalent of piston rings, and they wear over time.
When apex seals fail, compression drops and the engine loses power, eventually requiring a rebuild. Rebuilds typically cost $3,000-$6,000 depending on the shop and whether the rotary housings need replacement. However, the cost can escalate to $10,000 if extensive machining or rare parts are required, particularly for high-performance builds.
The reality is more nuanced than the reputation suggests. A well-maintained 13B-REW, with proper oil levels (rotary engines consume oil by design -- it's injected into the combustion chamber to lubricate the apex seals), appropriate warm-up and cool-down procedures, and regular maintenance, can last 100,000+ miles before needing attention. The cars that eat apex seals are typically those that have been neglected, modified without proper tuning, or repeatedly subjected to cold-start abuse. Enthusiasts often advocate for pre-mixing oil with fuel as an additional measure to prolong seal life.
What to Pay
The FD RX-7 market has appreciated significantly:
- JDM imports (right-hand drive): $30,000-$55,000 for clean examples
- US-spec (left-hand drive, 1993-1995 only): $35,000-$70,000
- Low-mileage/exceptional: $70,000-$100,000+
- Spirit R (final special edition, JDM only, 1,504 units): reported well into six figures for the best examples
US-spec cars command a premium because only about 13,900 FDs were sold in the US market across just three model years (1993-1995). Mazda withdrew the RX-7 from the US after 1995 due to declining sales and emissions concerns, but continued production for Japan through 2002. The rarity of US-spec models is further compounded by the fact that a significant number have been modified or poorly maintained, making original, unmodified examples particularly desirable.
Buying Tips
1. Compression test first. Before anything else, have the engine compression tested. A healthy 13B-REW should show 7.5+ kg/cm² across all faces with no more than 1 kg/cm² variation between them. This test is crucial, as it directly indicates the condition of the apex seals and overall engine health.
2. Service history is everything. Look for documented oil changes (rotaries need frequent changes with the correct weight oil), coolant system maintenance, and turbo service. The sequential turbo system has vacuum-operated actuators that can fail, leading to costly repairs if ignored.
3. Check for modifications. Many FDs have been modified. While bolt-on modifications (intake, exhaust, boost controller) are generally fine if properly tuned, heavily modified cars carry more risk. A stock or lightly modified car is the safer purchase. Factory parts are becoming harder to find, making originality a key factor in value retention.
4. Inspect the turbos. Listen for whine, check for shaft play, and look for oil residue. Turbo replacement is expensive, often running into several thousand dollars for OEM parts, so ensuring their condition is vital.
5. Rust inspection. FDs can rust, particularly in the rear quarter panels, wheel wells, and around the rear hatch. Southern and western US examples are preferred. Rust can be a deal-breaker, as it often indicates deeper structural issues that are expensive to rectify.
Regional Market Differences
The appeal of the FD RX-7 varies significantly across global markets. In Japan, where the car was produced until 2002, the RX-7 is celebrated as a domestic icon. The JDM-exclusive Spirit R, produced in 2002, represents the pinnacle of the RX-7 lineage, with only 1,504 units made. These models are highly sought after in Japan, with the best examples fetching well into six figures.
In Europe, the FD was sold officially only briefly (1992-1995) and in tiny numbers -- just 1,152 through the official network, 210 of them in the UK -- making imports from Japan and the US the primary source for enthusiasts. European buyers often face additional import duties and taxes, which can inflate the cost significantly. Despite this, the RX-7's reputation for exceptional handling and unique rotary engine make it a prized acquisition.
In Australia, the RX-7 enjoys a cult following, bolstered by the country's strong motorsport culture. Australian regulations allowed for the importation of JDM models, and the car's performance in local racing series has cemented its status as a track-capable machine. Prices in Australia are competitive with those in North America, though the availability of JDM models provides more variety for collectors.
Why It Matters
The FD RX-7 is the last car Mazda built around the rotary engine as a serious sports car proposition. The RX-8 that followed was a 4-seater with a naturally aspirated rotary that, while characterful, lacked the FD's performance credentials. The FD represents a high-water mark in Mazda's rotary development, a point at which the company's ambitious engineering met the practical realities of emissions regulations and market demand.
In a world that has moved toward turbocharged four-cylinders and electric motors, the FD represents something irreplaceable: a sports car powered by a unique engine technology, wrapped in one of the most beautiful bodies ever designed, and weighing less than most modern hatchbacks. It represents Mazda's engineering audacity and the enduring appeal of the rotary engine, a powerplant that, despite its flaws, continues to captivate the imaginations of enthusiasts around the world.
The 13B-REW was an engineering dead end -- but what a glorious dead end it was. As the market for classic Japanese sports cars continues to heat up, the FD RX-7's blend of performance, design, and rarity ensures it will remain a cherished piece of automotive history for years to come.