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NASCAR’s 2024 Cup Series season is off to a statistically significant and encouraging start, a trajectory attributed by key industry figures to a concerted collaborative effort between the sanctioning body, manufacturers, and teams. John Probst, NASCAR’s Executive Vice President and Chief Racing Development Officer, has lauded this period of unprecedented cooperation as the driving force behind the enhanced on-track product, particularly evident in recent races such as the event at Darlington Raceway.
The racing product at "The Track Too Tough to Tame" this past Sunday represented a tangible departure from previous iterations under the current car generation. For the first four years of this car’s deployment at Darlington, the rules package mirrored that used at intermediate-style tracks. This configuration featured a 4-inch rear spoiler and a more complex rear diffuser, coupled with a 670 horsepower tapered spacer engine. However, the 2024 season has seen a strategic recalibration. NASCAR increased the horsepower to 750 for all short tracks, a designation that has now been extended to select larger tracks like Darlington. This adjustment also entails a reduction in the rear spoiler size to 3 inches and a simplified rear diffuser.
The implications of these technical modifications are substantial. At Darlington, this translates to a projected decrease in on-throttle time and a significant 20 percent reduction in overall downforce. This combination is anticipated to amplify tire falloff and, consequently, enhance on-track action, a development long advocated by many drivers. Veteran competitors like Denny Hamlin have publicly called for as much as a four-second drop in lap times due to tire degradation, while Brad Keselowski has predicted an increase in contact with the wall, potentially leading to broken toe links.
Probst, while refraining from issuing precise quantitative predictions, acknowledges the directional shift towards a less stable car requiring greater tire management. "I would say that, while some might be comfortable saying there’s going to be a four second fall off and try to put a number on it, from our side, we’re just more comfortable saying it’s going to be directionally that way," Probst stated in an interview with Motorsport.com. He emphasized the inherent limitations of NASCAR’s simulation capabilities when compared to the highly refined, minute-level optimizations performed by individual teams and Original Equipment Manufacturers (OEMs).
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"I think that, when you look at the teams and they are trying to extract every ounce of performance out of the car, they have probably taken a little bit more time to make their simulations good to the 32nd of an inch," Probst elaborated. "Whereas, we turn bigger knobs like horsepower, drag and grip, things of that nature. We generally go more towards a directional standpoint and lean on the teams and OEMs to start putting some more precise numbers around the simulation in particular."
This dynamic is a recurring theme within NASCAR, where the sanctioning body and tire supplier, Goodyear, establish a general framework for expected performance, with teams and drivers subsequently pushing the boundaries of setup and tire pressure strategies during race weekends. This iterative process has been instrumental in the evolution of the package at Darlington over the past five years. Upon its debut in 2022, the current-generation car exhibited considerable grip with minimal tire wear, allowing leaders to effectively "air block" and maintain significant advantages. As Goodyear gained confidence and introduced softer tire compounds, this scenario became less prevalent. The current adjustments, with reduced downforce and increased horsepower, are expected to further diminish this aspect of racing.
The push for a reduced aerodynamic package at tracks like Darlington has been a consistent refrain from drivers throughout the early lifecycle of the current car. Probst confirmed that the decision to implement the short-track configuration at Darlington this season was directly influenced by the horsepower increase. "I think the two were going together in a lot of ways for us, meaning the engine and aero, and we obviously heard the fans and listen to the drivers quite often," Probst explained. "There has always been a drumbeat there for more horsepower, and we got to work with our builders across the board, over the past few months to a year now to get as much as we can out of this engine without changing a lot of the hardware around it."
This enhanced horsepower package was first showcased at Phoenix Raceway earlier this year, yielding positive feedback regarding the dynamic of "comers and goers" and increased car movement. "We unloaded that this year to a pretty promising race at Phoenix," Probst noted. "We got a lot of good feedback from the drivers and fans on that race, with respect to comers and goers, and a lot of sliding around… We’ve had drivers, even going back to testing last year, asking us to get more aggressive with the short track package and running at some of the bigger tracks."
This strategic philosophy has led to the expansion of the short-track package to include venues such as Bristol, Dover, Darlington, Nashville, and Gateway. At Phoenix, the increased action was evident, with Ryan Blaney demonstrating the ability to advance through the field multiple times en route to victory, a feat that had previously been considerably more challenging.
However, the implementation of more aggressive racing packages has also drawn scrutiny from a segment of the fanbase, with some expressing concerns about an increase in on-track incidents. While the anticipated tire falloff and reduced grip at Darlington could potentially lead to more crashes, Probst emphasized the delicate balance NASCAR aims to strike in delivering a compelling "race quality" product. He hopes that any increase in incidents will not be met with undue criticism, as it stems from NASCAR and Goodyear’s ongoing efforts to balance the "ability to race" with a car that is "hard to drive."
"I feel like right now, the relationship between NASCAR, the teams, drivers and even OEMs, and we’ve all said this, we’re going to get on this island together and be aggressive," Probst stated. "And I think the more aggressive we’ve gotten with the tires, the better the racing has been for the fans."
This collaborative and aggressive approach is credited with producing what is considered the most compelling Phoenix race of the NextGen era and is expected to translate into a similarly thrilling event at Darlington. "I know that sometimes we don’t always move as fast as the fans want us to, but I will say we do hear it all, and we’re acting on it internally with ourselves and all the stakeholders," Probst remarked. "And that means the fans, our drivers and media partners, and whenever there is that plurality of folks pulling in the same direction and agreeing with what we should do, we move as fast as anyone."
Looking ahead to the Darlington race, Probst expressed optimism. "This has been a good year so far and we’re looking forward to Sunday… It’s going to be hot, slipper and with a bunch of unknowns, it should be an entertaining race." The synergy between NASCAR’s strategic adjustments and the teams’ relentless pursuit of performance, coupled with Goodyear’s evolving tire compounds, has created a fertile ground for dynamic racing, underscoring the positive impact of industry-wide collaboration on the current NASCAR Cup Series season.
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