FIA Approves Engine Rule Changes to Give Honda a Lifeline in 2026

The FIA has formally approved a set of amendments to Formula 1's engine regulations designed to provide targeted assistance to Honda, whose 2026 power unit has struggled significantly in the opening rounds of the season. The changes, ratified by the World Motor Sport Council, unlock additional development resources and financial allowances for manufacturers found to be lagging furthest behind the established benchmark.

The ADUO Mechanism: What Has Changed

On the testing side, the power unit test bench running allowance has also been increased. Manufacturers more than 10% off the benchmark can now access an additional 230 hours of testing, up from the previous 190-hour allowance — itself representing an 8% threshold.

Honda, which is supplying Aston Martin this season and has been shifting its focus to energy management and driveability after a difficult start to the campaign, is understood to be more than 10% adrift of the benchmark — making it the primary beneficiary of these enhanced allowances.

A Brief Suspension Before Final Approval

The path to ratification was not entirely smooth. As the Miami Grand Prix approached, the vote on these changes was temporarily suspended, with sources indicating the FIA wanted to conduct a more thorough review of the proposed framework. The concern was specific: ensuring the mechanism delivered the right level of support without inadvertently becoming a tool that could catapult a manufacturer from the back to the front of the grid in a single leap.

Following that review, the governing body was satisfied that the revised structure struck the appropriate balance and the rules were subsequently approved. The broader principle — that a major car manufacturer struggling at the rear of the field is damaging for the sport as a whole — was reportedly accepted by Honda's rivals, who had expressed support for the assistance.

This is a sentiment echoed more widely across the paddock. Aston Martin themselves have been battling their own technical demons, with the Honda-powered AMR26 facing vibration issues and gearbox troubles alongside the underlying power unit deficit.

Revised Upgrade Timeline

Beyond the financial and testing allowances, the FIA has also adjusted when it assesses which manufacturers qualify for upgrade support — a change made necessary by the cancellation of the Bahrain and Saudi Arabian Grands Prix earlier in the season.

Heading into 2026, the first qualifying assessment had been scheduled after race six — originally the Miami Grand Prix. With the two Middle East rounds removed from the calendar, race six is now set to be the Monaco Grand Prix on June 7, a date the FIA determined was too late to trigger early support for struggling manufacturers.

As a result, a one-off adjustment has been made for this season. The first assessment — where the FIA will determine which manufacturers are more than 2% adrift of the benchmark — will now take place after the Canadian Grand Prix on May 24. The full revised schedule of upgrade assessments for the remainder of 2026 is as follows:

• Canada (Round 5 — May)
• Hungary (Round 11 — July)
• Mexico (Round 18 — November)

The ICE Performance Measurement Debate

The upgrade system has not been without controversy. Mercedes, in particular, has raised concerns that the ADUO mechanism was conceived as a catch-up safety net for those genuinely at the back — not a mechanism to allow a team near the front to make a step that puts them on top. The debate reflects broader tensions in the paddock over how fairly the framework is being applied. McLaren's Andrea Stella has gone even further, calling for hardware changes to the 2026 power unit regulations, suggesting the current framework may need more fundamental revision by 2028.

A separate but related dispute has emerged over the methodology used to measure internal combustion engine performance. Complications have arisen from external variables — including turbo size and back-pressure generated by exhaust wings — that can distort the power calculations used to determine where each manufacturer sits relative to the benchmark.

The FIA has acknowledged this complexity. In an additional note accompanying the revised rules, the governing body indicated that the 2% threshold and the ICE performance index itself may be validated or adjusted following the post-Canada assessment, pending the conclusion of ongoing discussions between power unit manufacturers and F1 teams regarding on-track ICE performance measurement.

With Canada now serving as the first real test of this new framework, the coming weeks will be critical — both for Honda's recovery trajectory and for the credibility of the ADUO system itself.