IMSA will not follow the new-for-2018 policy implemented by the ACO/FIA to balance its WEC P2s using ballast, changes to fuel cell capacity, and aerodynamic restrictions. It marks the first change of direction between the organizations on the subject of WEC P2 performance management.As the FIA announced this week in...

NASCAR evaluated six different rule change options in a test at Michigan Speedway on Monday as it investigates ways to improve the quality of Sprint Cup racing for 2015.Ten drivers from nine different teams took part in the test, which included two short mock races.NASCAR's vice president of innovation and...