FIA finds no extra power unit homologations in final ADUO window

The FIA has published its findings from the final Additional Development and Upgrade Opportunities (ADUO) window of the 2026 Formula 1 season. The scheme was introduced under the new regulations to let manufacturers that are behind the leader catch up, with upgrades available to any manufacturer whose internal combustion engine element is more than two per cent off the leading manufacturer's.

The third window, which ran between the Dutch and United States Grands Prix, produced no additional homologations. The FIA said the relative performance gaps to the leading internal combustion engine evolved, but these changes did not result in any new homologations being granted to power unit manufacturers. Earlier windows had seen Mercedes receive one fresh homologation, while Audi, Ferrari and Honda were allowed two.

Nikolas Tombazis, the FIA's single-seater director, said the body was confident in its analysis and that the ADUO concept remains the right one, but that the methodology will be refined with manufacturers and teams for future seasons.