13B Peripheral Port Rotary Restrictor
#29533 from Ed Dickinson · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Balance of Performance (BoP) adjustments
are used to bring an engine platform in line with other platforms' rate of acceleration in a speed range before aerodynamic drag
has a significant effect. BoP adjustments are not used to equalize lap time performance or ensure overall competitiveness, and
the Club Racing Board does not adjust power or minimum weight to balance differing chassis configurations. Data obtained
during the 2019 U.S. Majors season shows that the Mazda 13B’s performance is fully in line with and at no disadvantage to other
engine platforms' rate of acceleration, so removal of the 13B's inlet restrictor is not warranted. Please see the responses to
letter #25759 in the January 2019 Fastrack Minutes and letter #27736 in the December 2019 Fastrack Minutes.