Ferrari has introduced its final aerodynamic upgrade package of the 2026 Formula 1 season at the United States Grand Prix, with four interconnected changes to the SF-26 aimed at increasing downforce and improving the efficiency of the underfloor. The revisions involve the floor, plank, sidepod inlet area and diffuser, addressing different parts of the same aerodynamic system rather than concentrating on one isolated component.
Austin is a particularly suitable venue for evaluating these developments because the Circuit of the Americas provides a comprehensive test of a Formula 1 car’s aerodynamic and mechanical performance. The variety of corners and operating conditions should help Ferrari assess whether the latest modifications deliver the expected improvement. The package also represents an important response to Charles Leclerc’s concerns about Ferrari losing ground to its rivals.
The search for performance involves components that rarely attract much public attention but determine a significant proportion of a car’s aerodynamic behaviour. The floor, plank, sidepod inlets and diffuser form a closely interconnected system in which even relatively small geometric changes can influence pressure distribution, downforce generation and the quality of airflow reaching the rear of the car.
The FIA’s technical documentation identifies four principal areas of development on the Ferrari SF-26. Their stated purpose is to improve performance through more effective management of local aerodynamic loads and airflow conditioning, with changes both to the floor geometry and to the path followed by air beneath the car.
Rather than redesigning a single component, Ferrari has therefore modified several elements within the same aerodynamic system. This distinction matters because generating more usable downforce requires more than changing one surface. Engineers must also maintain airflow quality and stability along the route towards the diffuser.
Ferrari SF-26 Austin upgrades: floor and plank receive revised geometry
The first two areas affected by Ferrari’s Austin upgrades are the main floor body and the plank, the board positioned underneath the car. According to the technical documentation, Ferrari has revised the arrangement of the skid reinforcements and introduced a new configuration for the floor’s leading edge.
The modifications also include reshaping the internal vertical elements and the upper horizontal surfaces associated with the plank structure. These geometric revisions therefore affect both the configuration of the floor’s front edge and the arrangement of its supporting elements.
The overall objective is to increase the aerodynamic load produced by the floor, with changes targeting both its front and rear sections. Ferrari is seeking to improve the effectiveness of the entire system rather than restricting development to one particular area of the underbody.
The plank and its associated components must be considered within the complex interaction between the floor, external airflow and the car’s operating conditions. It is not possible to quantify the performance gain provided by each individual modification at this stage.
During the media day, Lewis Hamilton indicated that Ferrari expected an improvement of approximately one tenth of a second. That estimate does not establish how much performance each component will contribute, but it offers an indication of the anticipated overall benefit. For now, the main point is the direction of Ferrari’s development work: optimising the floor to achieve greater aerodynamic effectiveness.
Sidepod inlets and Coca-Cola section reshape airflow towards the rear
The third upgrade concerns the sidepod inlet area and the narrowing bodywork towards the rear of the car, commonly known as the Coca-Cola section. Ferrari has modified the lower volumes around the sidepod openings, revising the undercut profile and the geometry of the narrowing bodywork.
The configuration of the sidepod inlets influences how air is directed along the sides of the car and towards its rear aerodynamic surfaces. The undercut and bodywork geometry must therefore be evaluated in relation to the airflow reaching the rear section of the SF-26.
The stated aim is to improve local airflow conditioning, helping maintain stable airflow towards the rear of the car. The connection with the floor is particularly important: aerodynamic performance depends not only on the amount of downforce generated in one specific region but also on the ability to preserve favourable airflow conditions further downstream.
Ferrari revises SF-26 diffuser to improve downforce generation
The fourth and final development area is the diffuser, a fundamental component in managing airflow leaving the rear of the floor. Ferrari’s revisions involve the diffuser’s overall volume, expansion profile, aerodynamic loading of the vertical vanes and outer elements around the exit edge.
The technical documentation links these modifications to improved airflow quality at the diffuser inlet. Ferrari has further optimised the expansion profile and general geometry with the aim of generating greater aerodynamic load efficiently.
This is a crucial part of the upgrade because diffuser performance cannot be separated from the conditions under which air reaches its entrance. More stable and better-conditioned airflow allows the expansion process to operate more effectively, while changes to the vertical vanes and exit-edge structures complete the geometric revision.
The diffuser changes therefore complement the work carried out further forward. Ferrari is attempting to improve not only individual aerodynamic surfaces but also the way air travels through the entire underfloor system before exiting at the rear.
Lewis Hamilton expects a small gain as Ferrari prepares Austin evaluation
Taken together, Ferrari’s four SF-26 upgrades reveal a coherent development strategy: increase the potential of the floor, control the airflow passing around the sidepods and improve downforce generation towards the rear of the car. The modifications are designed to work together, making the overall aerodynamic result more important than the contribution of any single revised component.
However, without quantitative performance data, it is not yet possible to establish the precise improvement or isolate the effect of each modification. Lewis Hamilton’s estimate of approximately one tenth provides a preliminary expectation rather than a confirmed on-track gain.
The opening practice sessions at the 2026 United States Grand Prix will begin to reveal the extent of the benefits. Austin’s varied layout should offer Ferrari a valuable opportunity to assess whether the changes produce the intended improvement across different types of corners and operating conditions.
The challenge for Ferrari is to establish whether its final aerodynamic package delivers a meaningful increase in usable performance. The extent of that progress, and the contribution of the four interconnected modifications, will become clearer as the SF-26 accumulates running at the Circuit of the Americas.
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