NASCAR Completes Short-track Package Test at Phoenix
NASCAR conducted a two-day test at Phoenix Raceway to improve the short-track package for the upcoming season.
Baseline Test and Aerodynamic Changes
NASCAR recently conducted a two-day test at Phoenix Raceway to improve the short-track package for the upcoming season. The test involved six drivers, including Ryan Blaney, who won the 2023 NASCAR Cup Series title. The drivers tested various modifications related to aerodynamics, tires, muffler, and gearbox on the seventh-generation stock car.
Teams first established a baseline by running the same short-track package and tire combination that was used in the season finale one month ago. The drivers felt moderate to significant changes with the modifications made on the first day of the test. NASCAR Vice President of Vehicle Performance, Dr. Eric Jacuzzi, believed that testing at Phoenix Raceway provided a better understanding of the changes compared to the previous test at Richmond Raceway.
Aerodynamic Modifications and Tire Testing
During the test, aerodynamic modifications were made to the splitter and diffuser. The alternate splitter design drew the most reactions from the drivers, as it significantly changed the way the car drove. The diffuser was also simplified, and although the design is not finalized, the drivers had a positive reception to it.
The test also included the use of new Goodyear tires designed to create more fall off during green-flag runs. The drivers felt that the tires were one of the more significant variables during the test, and there is a likelihood that there will be a variation of them in the 2024 season. The on-track procedure for group runs was changed to simulate green-flag racing and promote passing.
Focus on Aerodynamics and Muffler Modifications
Based on the feedback from the drivers, NASCAR decided to focus on improving the aerodynamics of the short-track package, particularly the simplified diffuser. The teams tested different splitter and tire combinations to further enhance the package. However, plans to modify the gearbox were scrapped due to time constraints.
In addition to aerodynamics, modifications were made to the muffler to address concerns about excessive heat in the car. The duct work of the current muffler was modified to aid in expelling heat, resulting in a quieter engine. However, these changes are specific to the L.A. Coliseum and Chicago Street Course races.
