Formula One’s next regulatory cycle, spanning 2026 to 2030, introduces not only a radically redesigned hybrid power unit but also a new mechanism intended to prevent any single engine manufacturer from establishing an overwhelming and prolonged advantage.
This mechanism, known as Additional Development and Upgrade Opportunities (ADUO), is laid out in the FIA’s Technical Regulations and is designed to maintain competitive balance while preserving the sport’s engineering freedom. Rather than artificially slowing down the fastest engines, the FIA’s approach is to give underperforming manufacturers more opportunities to improve, creating a structured path toward convergence.
To achieve this, the FIA will continuously monitor the performance of every Internal Combustion Engine (ICE) supplied to teams throughout each season.
Key numbers behind ADUO
As the regulations state, “For each ICE supplied by the PU Manufacturers, an ICE Performance Index will be calculated.” This index, defined in FIA‑F1‑DOC‑096, becomes the central metric for determining whether a manufacturer is falling behind the best-performing engine.
The FIA may also request additional technical data from teams and manufacturers to support this evaluation, noting that “PU Manufacturers and F1 Teams may be asked to provide relevant additional information… which must be supplied upon reasonable request.” This ensures that the assessment is based on comprehensive and accurate data rather than isolated performance snapshots.
Each season is divided into three evaluation windows—Rounds 1 to 6, 7 to 12, and 13 to 18—during which the FIA compares every manufacturer’s ICE Performance Index to the highest index recorded in that period.
This comparison determines whether a manufacturer qualifies for ADUO. The regulations explain that the Performance Index will be measured against the best-performing ICE and used to decide whether a manufacturer should be granted additional development opportunities, with the FIA informing manufacturers of any such grants according to the procedure outlined in FIA‑F1‑DOC‑096.
The ADUO system introduces two performance thresholds. Manufacturers whose ICE Performance Index is “at least 2% but less than 4% below the best-performing ICE” are eligible for one additional homologation upgrade in the current season and one in the following season.
Those whose index is “at least 4% below the best-performing ICE” receive two additional upgrades in the current season and two more in the next. These upgrades are not cumulative within a season; as the regulations clarify, “ADUO homologation upgrades are not cumulative within a season and will only be granted following the first occasion that the PU Manufacturer is assessed… as eligible.”
Furthermore, manufacturers that do not qualify for ADUO in either of the first two evaluation periods are not eligible in the final period, preventing late-season distortions that could affect championship outcomes.
Once granted, ADUO upgrades must be applied within the designated timeframe. Upgrades awarded for season N must be used during that season, and any unused opportunities are forfeited at the final race. Upgrades awarded in season N‑1 for use in season N remain valid and are added to any new ADUO upgrades granted for that season.
What is the aim of ADUO?
The FIA also retains the authority to intervene if the system inadvertently creates a new imbalance, stating that “The FIA reserves the right to implement corrective actions… should the upgrades implemented under Article 3.3 result in a competitive imbalance.” This safeguard ensures that ADUO remains a tool for convergence rather than a source of new disparities.
The introduction of ADUO is particularly significant given the scale of the 2026 power-unit overhaul. With a 50/50 split between electric and combustion power and a shift toward sustainable fuels, the new engines represent the most dramatic change in Formula One’s hybrid era. Such a reset carries the risk that one manufacturer could discover a breakthrough that others struggle to match.
ADUO is designed to mitigate that risk by offering structured, data-driven opportunities for underperforming manufacturers to close the gap. Unlike Balance of Performance systems used in other racing categories, ADUO does not impose artificial limitations on the fastest engines. Instead, it preserves Formula One’s meritocratic ethos by allowing the slower ones to improve more rapidly.
Customer teams may experience fluctuations in competitiveness depending on their supplier’s ADUO status, and mid-season upgrades could become more strategically significant than ever before. In essence, ADUO adds a new layer of strategic and technical complexity to Formula One, blending sporting fairness with engineering ambition.
Ultimately, the FIA’s ADUO system represents a carefully calibrated attempt to manage the competitive risks of Formula One’s next technological revolution. By tying development freedom to measured performance deficits, the FIA aims to ensure that the 2026–2030 era remains fiercely competitive without compromising the sport’s identity as the pinnacle of motorsport engineering.
Whether the system succeeds will depend on how closely the field converges and how effectively the FIA enforces the framework, but it is clear that in the new hybrid era, the battle for supremacy will be fought not only on the track but also in the test benches, simulation labs, and homologation meetings that define the sport’s technical frontier.
It remains to be seen whether the FIA makes any tweaks to the four periods of the season after the cancellation of the Bahrain and Saudi Arabian Grand Prix. It could either mean that the FIA sticks to the original six-race period which would see the governing body analyze the performance of the five different power units after the Monaco Grand Prix or the first period would end after the Miami Grand Prix as originally planned.
