In its engine performance evaluation after the 2026 Monaco Grand Prix, FIA placed Red Bull at the top of the internal combustion engine rankings. This result also determined the allocation of additional development and upgrade opportunities throughout the season.
The evaluation was conducted using an index designed to measure engine performance. This index considered factors such as torque, engine speed, MGU-K power, and the weighting of how sensitive lap times are to power output.
Initial Review Covered Five Races
The first phase of the review included the Australian, Chinese, Japanese, Miami, and Canadian Grands Prix. FIA used a 14-day period to analyze the results and identify the best performing internal combustion engine.
According to the rules, manufacturers trailing the leading engine by at least 2% earn additional ADUO rights. This system was implemented to reduce performance gaps and maintain balance among engine manufacturers.
Mercedes Falls Short of Expectations
Mercedes, having won the first six races of the season and secured all pole positions, was initially seen as having the strongest engine. However, FIA’s index placed Red Bull’s unit in first place.
As a result, Mercedes, being at least 2% behind Red Bull’s engine, earned one additional engine development spending right for this season and one for the next.
Ferrari, Honda, and Audi were found to be more than 4% behind Red Bull’s engine. These three manufacturers will have two additional development rights this season and two more next season.
Upgrades Will Not Take Effect Immediately
These rights are not expected to yield immediate tangible results. The process is anticipated to take several months, requiring testing and design changes that cannot be implemented instantly.
Lewis Hamilton described this process as an "eight to ten-month project," emphasizing that it is not something that can be accomplished in a week.
The purpose of the ADUO system is to bring competition closer among engine manufacturers following the new technical regulations. In the new era, where teams must balance electric power and internal combustion engine power almost equally, the goal is to reduce performance disparities.