The Sports Car Club of America (SCCA) has released an updated version of the 2018 Time Trials Nationals Rules. The event is set for September 28–30 at NCM Motorsports Park in Bowling Green, Kentucky.

The rule update includes:

    •    Finalized language for allowed modifications at all four levels of preparation
    •    Finalized classing guidelines for the Max and Unlimited levels
    •    Proposed classing for Sport and Tuner, available for comment until May 10

The removal of the engine swap allowance at the Tuner level is one of the bigger changes included in this release. The decision to do so was based largely upon the survey data collected by the SCCA, which is said to have shown a strong preference that Tuner cars be restricted to original equipment configurations.

Survey data also led to the decision to keep the Max category on 200TW tires, which means that three of the four categories will be competing on street tires. Director of Experiential Programs Heyward Wagner expects that, as the program matures, people will build vehicles for Sport, Tuner and Max that are not street driven, but sees the emphasis on “streetable” vehicles as a means of access.

Also included in this update is the specific language for the classing of vehicles prepared for SCCA Street, Showroom Stock, Touring and Improved Touring classes as well as some allowances intending to encourage and ease the installation of safety equipment by allowing interior removal.

For more information, visit www.sccahq.com/time-trials-rules.