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Expansion of Aero Package, Composite Body Among Rule Package Highlights

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With just three races remaining on the NASCAR XFINITY Series schedule, some teams have already shifted their focus towards 2018 in hopes of coming out strong. The sanctioning body has also began to look ahead, releasing the 2018 rule package on Thursday.

The biggest highlight surrounds the events at Pocono Raceway and Michigan International Speedway, as the aerodynamic package implemented for 2017 at Indianapolis Motor Speedway will be used for both.  The specifications include a taller rear spoiler, use of a restrictor plate (7/8th-inch) and aero ducts (similar to brake duct openings).

NASCAR moved forward with this package at IMS this year, in hopes to promote more passing by lessening the aerodynamic advantage enjoyed by the lead car. It was deemed successful after the Lily Diabetes 250 featured a record number of race leaders (8) and lead changes (16).  


The sanctioning body also announced the mandatory rollout of the enhanced vehicle chassis (EVC) will be delayed to 2019, and Incident Data Recorders will be vehicle powered next season, versus being ran on separate batteries.

Other highlights include:

• Flange-fit composite body — optional at all tracks except superspeedways
• Common flat splitter
• Use of same common radiator approved for Monster Energy NASCAR Cup Series
• Reduction of brake cooling hoses, fans
• Single transmission rule enforced at all tracks except road courses
• Splitter height set at 4 inches at all venues, including superspeedways



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Ashley McCubbin

Currently the Executive Editor for Popular Speed, Ashley McCubbin also runs Short Track Musings, while handling media relations for OSCAAR. Currently living in Bradford, Ontario, she spends her weekend at the local short tracks in the area taking photos.