Byron: ‘Still some work to do’ on short track aero package

Sunday’s race served as the debut of NASCAR’s new aero rules this season for road courses and a majority of tracks measuring 1.058-mile or less in distance, including Phoenix.
The rules package, which was tested in the offseason at Phoenix, consists of a 2-inch spoiler and the removal of three diffuser strakes and engine panel strakes. The changes led to approximately 30-percent reduction …Keep reading