The wait for the FIA’s decision on ADUO continues to fuel discussion throughout the Formula 1 paddock. Among the most widely discussed theories is the possibility that Ferrari could use the development mechanism to intervene on the turbocharger of its 2026 power unit.
Such a move could influence the delicate balance between acceleration, traction and top speed, potentially helping the Scuderia reduce the gap to the benchmark power-unit manufacturers.
Ferrari awaits the FIA’s ADUO decision
The FIA’s upcoming communications could clarify which manufacturers will be granted access to ADUO and, more importantly, the extent of the development opportunities available.
The system introduced under the 2026 regulations allows power-unit manufacturers that are operating at a performance deficit relative to the category benchmark to introduce targeted upgrades to specific components.
The thresholds established by the regulations are particularly significant.
Manufacturers with a performance deficit below 2% are not eligible for any benefits. Those operating between 2% and 4% behind the reference level can receive one upgrade in 2026 and another in 2027. If the gap exceeds 4%, however, two upgrades per season become available.
Importantly, ADUO does not permit the development of an entirely new power unit. Instead, it allows manufacturers to intervene on specific homologated components identified within the development areas permitted by the regulations.
Ferrari’s turbocharger under scrutiny
Among the various technical theories that have emerged in recent weeks, one of the most frequently discussed concerns Ferrari’s turbocharger.
According to several reports circulating within technical circles, the Maranello-based team may have chosen a configuration featuring a slightly more compact compressor and turbine assembly than the solutions used by Mercedes-powered rivals. Such a choice would have offered advantages during race starts and low-speed traction phases.
The physical principle behind this is relatively straightforward.
A smaller turbine generally has a lower moment of inertia and therefore requires less energy to accelerate. This allows the turbocharger to reach its optimal operating speed more quickly, improving responsiveness at lower engine speeds.
However, every advantage comes with a compromise.
The trade-off between responsiveness and peak power
The turbocharger remains one of the most critical components of a modern Formula 1 power unit. Engineers must constantly strike a balance between low-end responsiveness and the ability to generate high airflow rates at elevated engine speeds.
Reducing the diameter of the turbine wheel can improve responsiveness, but it may also limit the system’s ability to sustain maximum power output at higher speeds.
This could potentially explain one of the differences observed during the opening races of the 2026 season. Ferrari has appeared particularly competitive during acceleration phases and in slow-speed corners, while Mercedes has often looked stronger when developing maximum speed along long straights.
From an engineering perspective, even relatively small dimensional changes can have a substantial effect.
The regulations permit turbine diameters ranging from 90 to 100 millimetres, and a difference of just a few millimetres can significantly alter the moment of inertia of the rotating assembly. Since moment of inertia increases with the square of the radius, and because the mass of the turbine wheel itself also grows with its geometric dimensions, even a modest reduction in diameter can generate meaningful changes in turbocharger responsiveness.
Could turbine blade geometry make the difference?
If Ferrari receives ADUO approval, one of the most interesting development areas could involve the turbocharger’s internal geometry.
The issue is not limited to modifying the diameter of the turbine wheel. Engineers can also work on blade profiles, airflow attack angles and the distribution of mass within the rotating components. The objective would be to shift the turbocharger’s optimal operating range toward higher engine speeds while preserving as much as possible of the responsiveness advantages currently associated with Ferrari’s configuration.
Achieving that balance is far from simple.
A turbocharger optimised for high-speed performance inevitably risks sacrificing some of the quick response characteristics that appear to be one of Ferrari’s strengths today.
New FIA procedures may have changed the picture
Another factor worth considering concerns the revised starting procedures introduced by the FIA. The new regulations allow drivers to stabilise the power unit more effectively before the start lights go out, enabling the turbocharger to reach favourable operating conditions more quickly. According to some observers, this change may have reduced part of the initial advantage provided by a smaller, faster-spooling turbocharger.
It is therefore not surprising that discussions have emerged throughout the paddock regarding the true impact of these revised procedures.
If regulatory changes gradually reduce the benefits available during race starts, manufacturers may find it more attractive to focus on improving outright performance at full power.
Could ADUO be directed specifically at the turbo?
Of course, nobody outside Maranello knows the true weaknesses of Ferrari’s 2026 power unit.
Nevertheless, the theory that Ferrari could focus an ADUO upgrade on the turbocharger appears technically plausible. By now, manufacturers have accumulated enough data from the opening races to compare relative performance levels and identify more precisely the areas requiring improvement.
If Ferrari’s primary deficit is indeed linked to top speed and high-rpm efficiency, the turbocharger could become one of the most logical candidates for ADUO development. Perhaps the most intriguing aspect of the system is the ability to improve specific components without redesigning the entire power unit architecture.
In this scenario, Ferrari could focus on the turbine wheel, blade geometry and internal aerodynamic characteristics in an effort to increase the overall efficiency of the system.
Final analysis
ADUO could prove to be one of the most important tools available for balancing performance among the 2026 power-unit manufacturers.
In Ferrari’s case, the turbocharger has emerged as one of the most credible areas for potential intervention. The apparent decision to use a more compact turbine may have delivered tangible benefits in race starts and traction zones, but it may also have limited the car’s potential at higher speeds. If the FIA grants Ferrari access to ADUO, a targeted upgrade focused on turbocharger geometry and operating characteristics could represent one of the most effective ways of reducing the gap to the strongest power-unit competitors.
The next official FIA communications should provide greater clarity on whether Ferrari will gain access to the ADUO mechanism and how much development freedom will ultimately be available.
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