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Spec Miata is a class of racing car used in Sports Car Club of America (SCCA), National Auto Sport Association (NASA), and Midwestern Council of Sports Car Clubs (MCSCC) road racing events.
The Spec Miata (SM) class is intended to provide the opportunity to compete in low-cost cars with limited modifications, suitable for racing competition. It is intended to encourage low cost, entry level, production car based competition. Spec Miata currently races both sprints and enduros where available.
Mazda MX-5s (also known as Mazda Miata Roadsters) in model years 1990 through 1993 with 1600 cc engines, model years 1994 through 1997 with 1800 cc engines, and model years 1999 through 2005 with 1800 cc engines have been approved by the SCCA for regional racing in all divisions of the SCCA. The class was approved for national SCCA racing beginning in the 2006 racing season. At the professional level, the SM cars are known as the Global MX-5 Cup.
Spec Miata was first approved as a regional class in the Southwest Division of SCCA in 1999 and the first race as an official class was at the Fiesta Carrera Regional, Texas World Speedway 2.90 road course on July 24, 1999, at 1:05 pm and included a starting field of four drivers: Tim Evans, Shannon McMasters, Bob Reinhardt and David Obeney finishing in that order.
The first Spec Miata race for the National Auto Sport Association was held in February 2000 by the NorCal Region. At the national level, the "UPR Racing Supply First Ever Spec Miata National" was held in Avondale, Arizona, at Phoenix International Raceway's infield road course on January 13, 2006 with Brad Rampelberg as the "First Ever" national race winner.
Mike Helpin, a local highly respected racer was awarded the 1st place trophy because Brad Rampelberg was disqualified for an undisclosed reason. Brad's disqualification was later overturned by a SCCA board. Brad Rampelberg was named winner in later posted results.
As its name shows, Spec Miata is a "specified" class. This means that the rules for allowable modifications to the car are very strict. The class intends to put drivers on a very even footing by making their cars as identical as possible. The rules are far more conservative than the Improved Touring category, but provide equivalent safety measures.
Because of the support of Mazda through Mazdaspeed, the wide availability of the car on the used market, plentiful and inexpensive parts, and the simplicity of maintenance on the cars, Spec Miata has become a very popular class. Also adding to the appeal is the fact that a Spec Miata can be raced in both SM and ITA/ITS in SCCA regional competition. A typical race-ready Spec Miata can be purchased on the market for $8000–$35,000 depending on race win history and specific modifications. A new MX-5 Cup (professional class) based on the ND series MX-5 costs $58,900 new, and champions of the national series can win over $200,000 to advance up the motorsport ladder.
In August 2019, Mazda Motorsports and Winding Road Racing announced Spec MX-5, a racing class structure based around the MX-5 NC that is designed to be an affordable, tech-able, reliable and fun-to-drive option for club racers. Race cars in the division will feature Roush Performance cylinder heads, Penske Racing shocks, Eibach springs and sway bars, Pagid brake pads, Toyo tires, and more, and will have a curb weight of 2,500 lb (1,100 kg). Spec MX-5 will have select events starting in 2020.

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