Electric Cars

IndyCar's ambitious development program for its future IR-28 race car is making significant strides. After initial evaluations on the smooth expanses of the Indianapolis Motor Speedway, the testing moved to the rigorous and unforgiving terrain of Sebring International Raceway. This pivotal phase, focusing on real-world durability and performance, saw seasoned driver Alexander Rossi taking the wheel, pushing the boundaries of the next-generation chassis.

IndyCar's IR-28 Chassis Undergoes Rigorous Testing at Sebring

On Tuesday, October 13, 2026, the second day of intensive testing at Florida's historic Sebring International Raceway, Alexander Rossi, a full-time driver for Chevrolet-powered ECR and the 2016 Indianapolis 500 victor, assumed the critical role of evaluating IndyCar's IR-28 chassis. This innovative vehicle is slated for its official debut at the commencement of the 2028 IndyCar Series season. The Sebring tests represent a crucial evolution in the development process, transitioning from the controlled environment of Indianapolis to a track specifically chosen for its challenging and varied surfaces, which closely resemble the conditions of street circuits.

Prior to Rossi's comprehensive evaluation, five-time and reigning series champion Alex Palou, driving for Honda-powered Chip Ganassi Racing, initiated the Sebring trials on Monday. Palou successfully completed 43 laps on the track's outer loop, subjecting the new car to a circuit notorious for its demanding blend of asphalt and concrete. Rossi's session on Tuesday was even more extensive, encompassing a remarkable 134 laps. Both drivers previously contributed to the IR-28's initial testing phases across both road course and oval configurations at the Indianapolis Motor Speedway in August and September.

Rossi articulated the significance of the Sebring venue, highlighting its unique characteristics: “This place is excellent because it offers the most challenging surface quality among permanent road courses. It effectively simulates a street course environment, yet its status as a permanent track ensures a higher grip level due to frequent use. The bumps, surface irregularities, and abrupt changes in asphalt make it an indispensable proving ground for vehicle components.” He emphasized that the testing in Sebring acts as a crucial preliminary assessment for performance on street circuits, which will constitute one-third of the 2026 racing calendar. The current phase of development is centered on scrutinizing the car's foundational systems and overall performance, building upon the insights gained from earlier Indianapolis sessions. Rossi collaborated closely with engineers from Dallara and officials from IndyCar throughout the testing. The progression of the development reflects a shift in focus: from initially validating system functionality, the emphasis has now moved to understanding the car's endurance and identifying any potential issues that may arise during prolonged, demanding use, particularly on rough, uneven surfaces. This iterative process, incorporating continuous driver feedback, is instrumental in refining the IR-28 to meet the rigorous demands of future competition.

Rossi shared his enthusiastic perspective on the new chassis, stating, “Visually, this car is stunning. It delivers enhanced grip in high-speed corners and is genuinely a pleasure to drive. Its construction is robust, and the engineering is exceptionally refined. We've also achieved a substantial leap in cooling efficiency during this test; the difference in cockpit comfort and drivability is truly remarkable.” The comprehensive testing schedule ensures that the IR-28 will be thoroughly vetted across various circuit types well before its 2028 debut. Each lap driven contributes invaluable data, guaranteeing that the car will not only endure the challenges of a race weekend but also deliver the thrilling performance that both drivers and fans eagerly anticipate. Rossi underscored the collective vision, remarking, “More innovations are planned to ensure this car not only races but excels, ultimately enhancing the spectacle for the fans, which remains our paramount objective.”

This rigorous testing process underscores the commitment of IndyCar to innovation and safety. By meticulously evaluating the IR-28 under diverse and challenging conditions, the series is not only preparing for the future of racing but also setting new benchmarks for vehicle performance and driver comfort. The collaborative efforts of drivers, engineers, and officials highlight a holistic approach to development, promising an exciting and high-performance future for IndyCar racing.

In the high-stakes world of Formula 1, where every millisecond counts, engineers constantly push the boundaries of regulations, seeking ingenious ways to gain a competitive edge. This relentless pursuit of innovation often leads to the discovery and exploitation of what are colloquially known as 'loopholes' in the technical rulebook. However, as history frequently demonstrates, such advantages are often fleeting, eventually drawing the attention of the sport's governing body, the FIA (Fédération Internationale de l'Automobile), which then steps in to ensure fair play and prevent any single team from dominating indefinitely through a technicality.

A recent development in this ongoing aerodynamic arms race involves Red Bull Racing, a team renowned for its clever engineering solutions. According to a report by Rosario Giuliana from AutoRacer.it, the FIA has initiated measures to nullify a specific aerodynamic design implemented by Red Bull earlier in the current season. This decision, slated to take effect from the 2027 season, will necessitate a significant overhaul of Red Bull's car design, as well as any other team that may have adopted similar concepts.

The particular design in question revolves around the intricate geometry of the car's lower sidepods. Typically, aerodynamic engineers aim for sharp, precise edges in this area to optimize airflow and direct it efficiently towards the car's underbody, enhancing downforce. However, FIA regulations stipulate a minimum radius for these surfaces, promoting smoother designs for safety and potentially cost-control reasons. Red Bull's engineering team, known for their meticulous attention to detail and creative interpretation of rules, identified a subtle ambiguity in the regulations concerning a 'floor body stay'.

This insight allowed them to integrate a structural cable along the lower ridge of the sidepod. Crucially, the regulations permitted bodywork immediately adjacent to this support stay to have a significantly smaller 20mm radius. By leveraging this exception, Red Bull managed to craft a far sharper and more aerodynamically aggressive undercut in their sidepod design compared to competitors adhering to a more conventional interpretation of the rules. This ingenious 'cable hack' was first observed on the RB22 car during the Austrian Grand Prix and proved so effective that other teams, including Audi, were quick to replicate the solution in subsequent races, highlighting its perceived performance benefits.

The FIA's response underscores the dynamic nature of Formula 1's technical regulations. Faced with an interpretation that offered a clear, albeit subtle, performance advantage, the governing body decided to act. For the 2027 season, the technical regulations will be amended to drastically reduce the permissible dimension for the floor support to a mere 5mm. This significant reduction in tolerance effectively eliminates the loophole Red Bull utilized, making it impossible to integrate such aggressive bodywork around the stay. Consequently, both Red Bull and Audi will be forced to undertake a comprehensive redesign of their sidepod architecture, ensuring compliance with the revised regulations.

This episode serves as a quintessential example of the constant cat-and-mouse game between Formula 1 teams and the regulatory body. Teams strive to innovate within the letter of the law, sometimes discovering unexpected avenues for performance, while the FIA monitors developments and closes loopholes to maintain competitive balance and ensure the spirit of the regulations is upheld. It's a cyclical process that keeps engineers on their toes and fuels the rapid evolution of F1 car design, promising that even with this particular trick outlawed, Red Bull's aerodynamic department will undoubtedly be hard at work concocting their next groundbreaking innovation long before the 2027 pre-season testing begins.