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[Jim Drago]

To all Spec Miata Competitors,
For the last several months, the SMAC team has been working diligently on further refining the Spec Miata restrictor plate and minimum weight specifications for each of the four key Miata groupings (‘89-‘93, ‘94-‘97, ‘99-‘00, ‘01-‘05). In doing so, highest priority was placed on reducing the large differences in weights between the cars, while also reducing the horsepower & torque differentials. The team believes that this strategy offers the greatest opportunity for achieving utmost parity for the wide range of tracks that the class races across the country.

The SMAC worked with John Mueller and Ryan Flaherty at NASA to get both bodies back on the same weight and plate rules, I think both organizations worked well together and put the needs of the class above all else. We are proud to announce both organizations will run the same weights and plates


The team relied on input from multiple sources of statistical data and drivers’ feedback from SCCA National & Regional, as well as NASA from a wide range of tracks from all regions. Furthermore, significant computer simulation work was performed, taking into account over 50 input factors including, but not limited to: full dyno runs from multiple dynos (not simply peak HP/Torque), weights, rev limiter points, differences in drag coefficients, weight affected rolling resistance, road grades (ie. hills), and much more.

While no scenario is perfect, it is clear that achieving parity for SM’s of all vintages is the best way to promote, grow and maintain the health the class for the future. The team strongly believes that the proposed weight and plate rules set will allow for the greatest opportunity for competitors in any vintage SM to compete for victories at any and all racetracks. As such, it is the intent of both the SMAC and CRB that these rules are implemented for 2012 and remain fixed for a period of three years, barring any unforeseen circumstances requiring major adjustment (ie. greater than 2mm plate or 50lbs). We are all looking forward to the most competitive racing ever in the 2012 season!


New restrictor plates will be available from SCCA enterprises on or before 12/15/11.


This thread was closed and serves only as an announcement. The discussion is in the SM forum


Sincerely,
Your Spec Miata Advisory Committee:
Mike Collins, Sam Henry, Dave McAnaney, Louis Thibaut, Dan Tiley

SCCA and NASA SM Restrictor Plates & Weights (Effective 1/1/2012)

Years Min. Weight Restrictor Plate
1989-93: 2300 None
1994-97 2350 45mm
1999-00 2400 38mm
2001-05 2400 40mm