No additional allowances after the third review
The FIA announced the results of its third 2026 Formula 1 ADUO review on November 10. Relative performance gaps to the leading internal combustion engine changed, but generated no additional homologations for power unit manufacturers. The findings have been communicated to them.
Additional Development and Upgrade Opportunities is a mechanism under Article C4 of the 2026 Technical Regulations. Manufacturers whose ICE performance falls at least 2% below the benchmark over defined periods can receive extra homologated upgrades, together with corresponding cost-cap and dyno-testing allowances. The ICE is the fuel-burning component of the power unit.
The first review ended after Canada and the second after Hungary. The third covered Races 12–18 and concluded after the United States Grand Prix. The FIA will disclose no further performance-index measurements because the information is confidential.
Existing approvals apply separately by year
The announcement restates the first-period findings. Mercedes fell within the 2–4% window, allowing one additional homologation in 2026 and another in 2027, with corresponding cost-cap and dyno-testing increases.
Audi, Ferrari and Honda were assessed as more than 4% behind, allowing two additional homologations in each of 2026 and 2027, with the associated resources. Neither the second nor the third review granted additional homologations.
Methodology under consideration
FIA Single Seater Director Nikolas Tombazis said extensive analysis had given the governing body confidence in its data, assessment process and conclusions. He said the first year reinforced its belief in the concept while highlighting the need for continued refinement.
The FIA is working with manufacturers and teams on potential changes to the methodology. The next review period begins in 2027 and covers the opening six races, from Bahrain to Miami.
