Red Bull Powertrains has emerged as one of the surprise success stories of Formula 1’s new 2026 power unit era after reportedly being recognised by the FIA as having the strongest internal combustion engine on the grid.
However, while the achievement represents a significant milestone for Red Bull’s first fully in-house power unit programme, it has also created an unexpected consequence that could strengthen Mercedes’ position even further under the controversial ADUO regulations.
The development has reignited debate throughout the paddock about whether the FIA’s engine equalisation measures are functioning as intended, with some insiders now questioning whether the ADUO system should be revised or abandoned altogether.
Red Bull’s engine programme exceeds expectations
When Formula 1 introduced its all-new power unit regulations for 2026, Red Bull faced one of the biggest challenges on the grid.
After years of operating with Honda power, and prior to that Renault, the Milton Keynes-based team embarked on its first complete engine programme through Red Bull Powertrains. Many observers expected the project to require several seasons before matching the established manufacturers.
Instead, Red Bull appears to have made rapid progress.
According to reports from the paddock published by Jonathan Noble in ‘The Race’, FIA assessments have identified Red Bull as possessing the strongest internal combustion engine component among the current manufacturers. The recognition comes despite widespread expectations that Mercedes would continue to set the benchmark in overall power unit performance.
The achievement is particularly significant given the scale of Red Bull’s undertaking. Developing an entirely new Formula 1 power unit operation from scratch while simultaneously competing for championships represented one of the most ambitious projects in the sport.
For Red Bull, the FIA’s assessment serves as validation that its investment in Red Bull Powertrains is beginning to deliver results.
Why the FIA decision creates a problem
However, the FIA’s recognition comes with an unintended downside. Under the ADUO regulations, manufacturers that are deemed to be underperforming in certain areas can be granted additional development opportunities designed to help close performance gaps.
Because Red Bull’s internal combustion engine has been identified as the strongest in the field, the team does not qualify for certain development allowances available to rivals.
That has created a scenario that many in Formula 1 view as contradictory.
While Red Bull can celebrate its engineering achievement, Mercedes may ultimately emerge as the bigger beneficiary. Despite already possessing what many regard as the overall benchmark power unit package, Mercedes remains eligible for further development opportunities under the current interpretation of the rules.
The situation has prompted questions about whether the regulations are accurately measuring total power unit performance or focusing too narrowly on specific components.
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Mercedes could strengthen an already commanding position
The controversy stems from the fact that Formula 1’s 2026 power units are no longer judged solely by combustion engine performance.
The regulations place a much greater emphasis on electrical power and energy deployment, with battery performance and energy recovery systems playing a crucial role in overall competitiveness.
As a result, having the strongest combustion engine does not necessarily equate to possessing the strongest overall power unit.
This distinction appears to be at the heart of the current debate.
According to analysis from The Race, several paddock figures were surprised by the outcome because Mercedes has generally been viewed as the leading manufacturer under the new regulations.
The concern among rival teams is that a mechanism originally designed to help struggling manufacturers catch up could instead provide further development opportunities to an already dominant competitor.
If Mercedes successfully utilises those allowances, the competitive gap could widen rather than narrow.
Growing calls to review the ADUO regulations
The latest developments have intensified scrutiny of the ADUO framework. Sources within the paddock reportedly believe the controversy could trigger a wider review of how performance is assessed when determining eligibility for additional development.
Critics argue that evaluating only combustion engine performance ignores the reality of modern Formula 1 power units, where electrical systems contribute a substantial proportion of total output.
As a result, there are increasing calls for the FIA to adopt a broader assessment methodology that takes into account the complete power unit package rather than isolated components.
Some insiders have even suggested that eliminating the ADUO system altogether may become a topic of discussion if teams conclude that the regulations are producing unintended competitive consequences.
Whether any changes can be implemented quickly remains uncertain, but momentum for a review appears to be growing.
Ferrari facing its own power deficit concerns
While Mercedes and Red Bull dominate the ADUO debate, Ferrari faces a separate challenge.
The Italian manufacturer is widely regarded as having one of the weaker power unit packages among Formula 1’s leading teams.
Although Ferrari’s chassis performance remains highly competitive, particularly through slower and medium-speed corners, straight-line performance has emerged as a noticeable weakness.
That contrast was evident during recent race weekends where Ferrari demonstrated impressive pace through technical sections but lost significant time on long full-throttle stretches.
Lewis Hamilton’s performances have highlighted the issue. In several instances, Ferrari has appeared capable of matching or exceeding rivals through corner sequences, only to surrender large chunks of lap time on the straights.
As Formula 1’s manufacturers continue to refine their 2026 power units, the FIA’s latest assessment has added another layer of intrigue to an already complex development battle.
Red Bull can take pride in achieving a remarkable milestone with its first in-house engine project. Yet the irony is that being recognised as the best in one area may leave the team at a disadvantage elsewhere, while Mercedes could be positioned to capitalise on regulations originally intended to promote competitive balance.
Why that matters could become one of the defining political and technical stories of Formula 1’s current engine era.
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Thiago Treze is a Brazilian motorsport writer at TJ13 with a background in sports journalism and broadcast media, alongside an academic foundation in engineering with a focus on Computational Fluid Dynamics (CFD). This combination of technical knowledge and editorial experience allows Thiago to approach Formula 1 from both a performance and narrative perspective.
At TJ13, Treze covers driver performance, career developments, and key storylines across the Formula 1 grid, while also analysing the technical factors that influence competitiveness. This includes aerodynamic development trends, simulation-driven design approaches, and the engineering decisions that shape race weekend outcomes.
His reporting bridges the gap between human performance and machine development, helping readers understand how driver execution and technical innovation interact in modern Formula 1. Coverage often connects on-track events with the underlying engineering philosophies that define each team’s approach.
With a global perspective shaped by both journalism and technical study, Thiago also focuses on Formula 1’s international reach and the different ways the sport is experienced across regions.
Treze has a particular interest in how Computational Fluid Dynamics and aerodynamic modelling contribute to car performance, offering accessible explanations of complex technical concepts within Formula 1.
