Image: from This is Formula 1 X @ThisIsFormu1a1
By Open Chronicle with agencies
The FIA is nearing a crucial decision on which Formula 1 power unit manufacturers will gain access to the ADUO system, a mechanism specifically designed to prevent major performance disparities during the sport’s new engine era that began in 2026.
The evaluation, based on performance data gathered during the first five races of the season, is expected to be finalized shortly after the Canadian Grand Prix. Under FIA regulations, the governing body must officially notify eligible manufacturers within 15 days of the event.
The decision is being closely watched throughout the paddock, as it could significantly influence the competitive landscape of Formula 1’s newest technical generation.
What Is ADUO?
The Aerodynamic and Power Unit Development Opportunity (ADUO) was introduced to avoid a scenario in which a manufacturer becomes trapped with an underperforming engine package for several years under the sport’s strict homologation rules.
Formula 1’s 2026 regulations represent one of the biggest power unit changes in decades. The new engines feature a much more balanced distribution between internal combustion power and electrical energy recovery systems, making hybrid performance as important as the traditional engine itself.
Recognizing the risk that one manufacturer could fall significantly behind, the FIA created ADUO as a controlled mechanism that allows struggling suppliers to accelerate development without completely removing regulatory stability.
How Manufacturers Are Evaluated
The FIA determines eligibility by analyzing the average performance of each power unit supplier during the opening five races of the season.
For every manufacturer, the governing body uses the results achieved by the best-performing team using that engine, whether it is a factory operation or a customer team.
This approach aims to isolate the true performance of the power unit rather than factors related to individual team operations or chassis performance.
While the internal combustion engine remains the primary reference point in the evaluation, the scope of ADUO extends far beyond the traditional engine itself.
Components Eligible for Development
Manufacturers granted ADUO status will be permitted to introduce updates across a wide range of power unit systems, including:
• Internal combustion engine block
• Internal engine components
• Oil circulation systems
• Cooling and water circulation systems
• MGU-K electric motor generator
• Battery systems
• Energy Recovery Systems (ERS)
• Power unit control electronics
• Approved hydraulic systems
• Fluids and selected ballast-related elements
Engineers believe the electrical side of the power unit may offer the greatest opportunity for performance gains under the 2026 regulations.
As a result, the ability to further develop batteries, ERS systems and MGU-K components could prove particularly valuable for manufacturers attempting to close performance gaps.
What Remains Open to Everyone?
Certain components remain freely developable regardless of ADUO eligibility:
• Turbochargers
• Plenum chambers
• Air intake systems
• Specific hybrid system areas defined by regulation
Meanwhile, several components remain frozen for all manufacturers:
• High-pressure fuel pumps
• FIA-standardized sensors
• Standard Parts defined by regulation
• Other explicitly restricted components
These limitations are intended to preserve cost control and prevent manufacturers from engaging in unrestricted development wars.
Additional Homologation Opportunities
One of the most significant benefits offered through ADUO is the possibility of receiving one or two additional homologation opportunities between 2026 and 2027.
This allows manufacturers to introduce substantial upgrade packages during the regulatory cycle rather than waiting for future rule changes.
However, developing new engine components remains a lengthy and expensive process.
Unlike aerodynamic upgrades, which can often be produced and tested relatively quickly, power unit development requires extensive engineering work, manufacturing, durability testing, and regulatory validation.
Even with regulatory flexibility, meaningful performance improvements can take many months to reach the track.
Customer Teams Also Benefit
The FIA regulations also ensure that any upgrades developed under the ADUO framework must be made available simultaneously to all customer teams using that manufacturer’s power unit.
This provision prevents factory teams from gaining exclusive advantages through accelerated development.
If new components require significant modifications to a customer team’s chassis or supporting systems, the affected team may request additional implementation time from the FIA.
Budget and Testing Flexibility
Beyond technical freedoms, manufacturers receiving ADUO support may also gain temporary flexibility regarding engine development budgets and dynamometer testing time.
However, these advantages are not intended to create permanent benefits.
The FIA describes the system as an investment acceleration mechanism rather than an increase in overall spending capacity. Additional resources used today must eventually be balanced against future budget limits.
The objective is to maintain competition while preventing excessive disparities that could damage the sport’s competitive balance.
A Crucial Moment for the New Engine Era
As Formula 1 enters its most ambitious hybrid engine generation yet, the ADUO system represents an important test of the FIA’s ability to balance technological competition with sporting fairness.
The days when manufacturers could spend unlimited sums redesigning entire engine architectures are largely gone. Modern Formula 1 operates under strict financial and technical constraints designed to keep competition sustainable.
Yet the governing body also recognizes that allowing one manufacturer to remain significantly behind for an entire regulatory cycle would undermine both competition and manufacturer participation.
With the FIA’s decision expected soon, teams, manufacturers and fans alike are waiting to discover which power unit suppliers will receive additional development opportunities and how those decisions could shape the Formula 1 engine battle for years to come.