Mercedes has made adjustments to its diffuser design following a directive from the FIA prompted by complaints from rival teams, notably Ferrari. The changes come after the team introduced a diffuser upgrade at the Canadian Grand Prix that featured spike-like serrated profiles on the upper section, aiming to extend and enhance the diffuser’s aerodynamic effect.
The new design raised questions about its legality, leading Ferrari and other teams such as Racing Bulls (AlphaTauri) to seek clarification from the FIA. After the Barcelona Grand Prix, the FIA issued a technical directive to restrict such extreme diffuser designs. Mercedes responded by making minor modifications, removing the serrated spikes but keeping some diffuser extensions within the updated regulatory framework. Racing Bulls were also required to adjust their diffuser extensions accordingly.
The introduction of the diffuser upgrade was part of Mercedes’ first significant package of the season, which included revisions to the front wing and floor. Since winter testing, teams have been exploring ways to extend the diffuser to gain aerodynamic advantages, with Mercedes’ approach drawing particular attention. Other teams, including Ferrari and Haas, continue to develop diffuser extensions that comply with the new FIA directive, as seen on their respective cars.
The FIA’s intervention aims to prevent overly aggressive diffuser designs while still allowing some scope for aerodynamic development. This balance seeks to maintain fair competition and technical innovation within the sport’s regulations. Mercedes’ drivers, including championship leader Kimi Antonelli and George Russell, have been using the updated diffuser since the directive came into effect at the Austrian Grand Prix weekend.
While the precise impact of the diffuser changes on performance has not been detailed, the adjustments reflect the ongoing technical dialogue between teams and the FIA. The directive clarifies the limits of diffuser design, ensuring that no team gains an excessive advantage through extreme aerodynamic solutions.
Other teams remain active in exploring diffuser concepts that fit within the new rules. Ferrari’s SF-26 and Haas cars, for example, show continued development in diffuser extensions, indicating that this area remains a focus for aerodynamic gains. The situation highlights the technical challenges teams face in interpreting and adapting to evolving regulations.
Mercedes’ diffuser modifications demonstrate the dynamic nature of technical development in Formula 1®. The FIA’s role in issuing directives helps maintain a level playing field while allowing teams to innovate within defined boundaries. The adjustments ahead of the Austrian Grand Prix reflect this ongoing process of regulation and adaptation in the sport.
