The journey of automotive project ownership often transcends simple transportation, evolving into a comprehensive study of engineering, driver development, and mechanical resilience. Marking the completion of his second full year of ownership, automotive enthusiast and track-day driver Quade has detailed the rigorous transformation of his Mazda NB Miata. Purchased in late March 2021, the vehicle has undergone a sweeping series of modifications—ranging from chassis tuning and aerodynamic integration to a notable off-track excursion and subsequent repair—providing a compelling case study in grassroots motorsports development.

Chronology of a Twelve-Month Campaign

The second-year timeline commenced in March 2022, immediately returning the vehicle to competitive tarmac at the Raceway Park of the Midlands (RPM). Over the course of the driving season, the platform served as a testbed for both driver capability and mechanical upgrades.

Throughout eight separate track events at RPM, rigorous data logging demonstrated a continuous downward trend in lap times. Technical improvements, combined with refined driver inputs, shaved a remarkable 11.29 seconds off the car’s best lap times over a span of just over seven months. This progression underscored a foundational principle in amateur motorsports: seat time and driver education frequently yield greater dividends than aftermarket horsepower enhancements.

Expanding the testing footprint, April 2022 brought a visit to Motorsports Park Hastings (MPH). Benefiting from a fresh asphalt repaving project completed during the preceding winter off-season, MPH offered a stark contrast to the abrasive, patched surface of RPM. While RPM remained the favored venue due to its proximity and cost-effectiveness, the smooth infrastructure of Hastings established a secondary benchmark for high-speed handling evaluations.

Mechanical Upgrades: Soft Tops, Dyno Figures, and Power Delivery

As the driving season progressed into the warmer months, necessary creature comforts and mechanical maintenance were addressed. Over the Memorial Day weekend in May 2022, the degraded original vinyl soft top was replaced. Utilizing a secondary junkyard frame to streamline the installation process, a new Robbins canvas top featuring a zippered glass window was fitted. The installation highlighted the practical challenges of working with automotive textiles, requiring solar thermal expansion to achieve optimal tension across the rain rail and latches. The resulting upgrade provided enhanced thermal insulation, modern aesthetics, and improved long-term durability.

Logistical hurdles inherent to the compact Mazda chassis were systematically resolved in June 2022 with the fabrication of a custom tire trailer. Towed safely over 1,000 miles during the season, the sub-700-pound setup—built on a 40-by-48-inch Northern Tool frame with an extended plywood deck—allowed for the transport of a dedicated set of track tires, tools, fluids, a shade canopy, and 10 gallons of auxiliary fuel. This logistical autonomy eliminated the traditional compromises associated with driving a track-prepped roadster to remote venues.

Mid-season dyno testing in July 2022 provided quantifiable metrics regarding the engine’s performance trajectory. Compared to a baseline reading of 115 wheel-horsepower and 106 lb-ft of torque recorded in August 2021, the vehicle output increased to 136 wheel-horsepower and 119 lb-ft of torque. These gains were primarily attributed to the integration of a squaretop intake manifold and a standalone Megasquirt ECU operating on E85 fuel. Further engine management optimization and potential camshaft upgrades remain under consideration for future output gains.

Diversifying Motorsports Disciplines: Autocross, Rallycross, and High-Speed Incidents

The versatility of the NB Miata platform was further tested through participation in alternative motorsport disciplines. In August 2022, the vehicle made its debut at an SCCA Rallycross event held at I80 Speedway in Nebraska. While unsuited for loose-surface competition—resulting in the loss of a front splitter—the event demonstrated the vehicle’s low-speed handling predictability on dirt.

Concurrently, the vehicle maintained a consistent presence in the Nebraska Region SCCA Autocross championship, competing on the SCCA Solo Nationals site. Driver performance metrics reflected substantial growth, shifting from a bottom-tier percentile ranking at the start of the season to parity with the median field by October.

However, the pursuit of competitive limits on road courses carries inherent risks. On October 29, 2022, during the final track day of the season at Raceway Park of the Midlands, a high-speed incident tested the structural integrity of the chassis. Exiting Turn 10 with excess momentum, a rear-wheel slide correction led to understeer upon entry into Turn 11. The vehicle left the racing surface, scrubbing speed in the grass before impacting a tire wall at approximately 60 mph.

Analysis of the Incident and Post-Crash Reconstruction

Automotive safety infrastructure proved effective during the October incident. The tire barrier absorbed significant kinetic energy, preventing severe chassis deformation or occupant injury. Damage was largely confined to the front-left quadrant, encompassing a bent hood, crushed fender, dented bumper, and a fractured headlamp assembly, alongside superficial vinyl wrap scuffs.

Remarkably, the vehicle remained mechanically drivable and was piloted home. Within a single month, rapid post-crash reconstruction—facilitated by the cost-effective nature of vinyl wraps compared to traditional multi-stage paint matching—restored the vehicle’s exterior aesthetics. The car was successfully placed into winter storage by Thanksgiving, fully repaired and visually indistinguishable from its pre-accident condition.

Chassis Refinement, Engine Overhauls, and Aerodynamic Integration

The winter months of late 2022 and early 2023 were dedicated to comprehensive mechanical overhauls. December 2022 involved systematic suspension geometry updates. The previous year’s IL Motorsports rubber bushings were upgraded to A1 Ground Control Nylatron bushings housed within fresh control arms, supplemented by Paco Motorsports adjustable upper rear control arms. Nylatron, structurally similar to Delrin, offers exceptional low-friction articulation and self-lubricating properties without the binding issues often associated with polyurethane components, though it does transmit higher levels of Noise, Vibration, and Harshness (NVH) to the cabin.

January 2023 marked the commencement of extensive powertrain work. Addressing a persistent rear main seal leak necessitated pulling the engine, during which auxiliary maintenance tasks were performed. Concurrently, the acquisition of a healthy BP6D VVT motor and a six-speed transmission expanded the project’s future powertrain options.

Concluding the two-year milestone in February 2023, the installation of a Nine Lives Racing medium downforce aerodynamic kit—acquired during Black Friday promotions—significantly altered the vehicle’s dynamic profile. The kit, featuring a single-piece aluminum rear wing chassis-mounted to the trunk structure and a complementary front splitter, was selected to comply with SCCA XS-B class regulations. Street testing indicated immediate improvements in high-speed straight-line stability, neutralizing the inherent aerodynamic lift typical of unmodified NB Miatas without imposing measurable acceleration penalties.

Broader Implications for Grassroots Automotive Projects

The two-year progression of this Mazda NB Miata serves as a representative case study for grassroots motorsport development in North America. By systematically documenting modifications, maintenance, and competitive outings, the project illustrates how older enthusiast platforms can be modernized for reliability and performance. As the vehicle prepares for its third year of active duty, the combination of increased horsepower, sophisticated chassis tuning, and functional aerodynamics establishes a robust foundation for continued competitive development in regional time-trial and autocross events.