How F1’s additional development upgrade opportunities will be applied — and what’s changing?

Formula One will enter a new regulatory era in 2026, and alongside the radically revised power‑unit architecture, the FIA has introduced a mechanism designed to prevent long‑term performance stagnation among engine manufacturers.

Known as Additional Development and Upgrade Opportunities, or ADUO, the system allows power‑unit manufacturers to introduce extra upgrades to their homologated engines if they fall sufficiently behind the benchmark during the season. The intention is not to artificially equalise performance but to ensure that no manufacturer becomes trapped in a deficit that cannot be recovered under the cost‑cap framework.

ADUO is defined in the 2026 Technical Regulations as a structured process through which manufacturers may upgrade their power units either during the current season or the following one, provided they meet the performance criteria. Across three defined monitoring periods in each season from 2026 to 2030, the FIA will analyse the performance of the Internal Combustion Engine (ICE) supplied by each manufacturer to its customer teams.

This analysis produces an ICE Performance Index, calculated from a range of on‑car measurements including input shaft torque, engine speed, MGUK power and a weighting that reflects the sensitivity of power to lap time. From the outset, the FIA and the manufacturers agreed that variables such as fluid temperatures, external aerodynamic effects and similar influences would be captured naturally in the on‑car data, and that no correction factors would be applied.

Because the assessment focuses solely on the ICE, it does not represent the full performance of the hybrid power unit, given the decisive contribution of the ERS system. A manufacturer whose ICE performance is at least two percent behind the best‑performing ICE will qualify for ADUO.

FIA Single‑Seater Director Nikolas Tombazis has been keen to clarify the purpose of the mechanism. He emphasises that “it’s important to make clear that ADUO is not a kind of balance of performance mechanism.”

He stresses that the FIA will not intervene directly in sporting performance, adding that “a team or manufacturer will not suddenly get greater fuel flow rate or more or less ballast.” Instead, he describes ADUO as a financial tool within the cost‑cap framework: “It is, in fact, a Cost Cap relief mechanism, where a PU manufacturer meeting ADUO criteria during a review period is given an opportunity to develop its engine through a downward adjustment.”

Tombazis also underlines that ADUO does not replace the need for engineering excellence, noting that “that’s not to underestimate it but a manufacturer will still need to make the best engine in order to win. It’s not a magic bullet, or like the FIA is handing out brownie points to somebody who’s behind, it simply provides them with leeway to develop their power unit within the framework laid out by the Technical Regulations.”

The financial implications of ADUO are defined in Article E4.1.1.t of the 2026 Formula One Regulations. Manufacturers whose ICE performance falls between two and four percent behind the benchmark may receive up to three million dollars in additional development allowance outside the cost cap. Those between four and six percent behind may receive up to 4.65 million dollars, while deficits between six and eight percent may trigger allowances of up to 6.35 million dollars.

Manufacturers between eight and ten percent behind may receive up to eight million dollars. Any manufacturer more than ten percent behind may receive up to eleven million dollars, and for the 2026 season only, they may also bring forward up to eight million dollars of future cost‑cap allowance to accelerate development.

The monitoring periods for 2026 are defined in Article 4.2 of Appendix C5 of the Technical Regulations. The season is divided into three segments: races one to six, seven to twelve and thirteen to eighteen.

However, due to disruptions in the Middle East, the first period has been adjusted and now covers the first five races: Australia, China, Japan, Miami and Canada. The FIA will communicate the results no later than two weeks after the Canadian Grand Prix. The second period will run from Monaco to Hungary, and the third from the Netherlands to Mexico City.

Once the results are issued, any manufacturer deemed eligible for ADUO will receive a separate notification detailing its allowance and may introduce upgrades as early as the next race.

The number of upgrades permitted depends on the size of the performance deficit. According to Article 4.3 of Appendix C5, a manufacturer whose ICE Performance Index is at least two percent but less than four percent behind the best will be entitled to one additional homologation upgrade in the current season and one in the following season.

Manufacturers at least four percent behind will be entitled to two upgrades in the current season and two in the next. However, if a manufacturer does not qualify for ADUO in either of the first two monitoring periods, it cannot receive ADUO after the final period of the same season.

Upgrades are not cumulative within a season. A manufacturer receives its allocation only at the first moment it qualifies, and any unused upgrades for the current season expire at the final round. Upgrades awarded for the following season remain valid, and if a manufacturer qualifies again the next year, the allowances stack. This means a team could, for example, introduce four upgrades in a single season if it carries over two from the previous year and earns two more.

Although ADUO is triggered by ICE performance, the range of permitted upgrades is broader than the ICE alone. Table 1 of Appendix C4 lists the components that may be modified, including certain ICE elements, the exhaust system, the turbocharger and wastegate or pop‑off valve, electrical components and sensors mounted on the ICE or exhaust, ERS components and their cooling systems, the MGU‑K, the control electronics and selected hydraulic functions, fluids and ballast.

This ensures that manufacturers can address the full spectrum of performance‑limiting factors within the hybrid power unit architecture.

Through ADUO, the FIA aims to maintain competitive tension in the power‑unit landscape without compromising the meritocratic nature of Formula One. Tombazis’s comments underline that the system is designed to provide development flexibility rather than artificial parity.

It offers manufacturers who fall behind a structured, transparent and financially viable route to recover performance, while preserving the fundamental requirement to engineer the best possible power unit.