Mercedes is preparing to use its FIA ADUO development allowance on a new turbocharger for its 2026 Formula 1 power unit, after the Brixworth engine was deemed eligible for an additional development opportunity by falling within the 2–4% performance band.
The development gives Mercedes another opportunity to refine an already highly competitive power unit. The ADUO mechanism was introduced by the FIA to give manufacturers limited scope to address weaknesses or performance opportunities identified during the opening phase of Formula 1’s new 2026 power unit regulations.
Mercedes will spend its ADUO token on a new turbocharger
According to information obtained by AutoRacer, Mercedes has decided that its 2026 ADUO intervention will focus specifically on the turbocharger.
The choice is particularly significant because Ferrari and Audi have already targeted the same area this season. Ferrari introduced its second power unit development at Monza, while Audi used its only update of the campaign at Barcelona.
It is therefore becoming increasingly clear that the turbocharger is one of the most attractive areas for manufacturers looking to extract additional performance under the 2026 regulations. With the current formula placing enormous importance on energy management and overall power unit efficiency, optimising the turbo can translate relatively directly into gains for the internal combustion engine.
Mercedes’ decision follows earlier confirmation that the team would delay the introduction of its ADUO power unit upgrade beyond Baku, allowing it more time to define how best to use the permitted development opportunity.
Ferrari and Audi have already followed the same development route
The fact that Ferrari and Audi have already focused on the turbocharger offers a broader indication of how development priorities are evolving across Formula 1’s 2026 power units.
Different manufacturers began the season from very different competitive positions, yet several have identified the turbocharger as one of the most efficient areas in which to invest an ADUO opportunity during the campaign.
That choice also has a financial dimension. Power unit development remains constrained by Formula 1’s cost-control framework, meaning manufacturers must balance potential performance gains against the resources required to achieve them.
The wider ADUO system has already become an important talking point this season, with Mercedes and Red Bull among those involved in discussions over how the mechanism should operate as manufacturers develop at different rates.
Mercedes balances 2026 development against its 2027 programme
The financial consideration is especially relevant for Mercedes. The team had initially chosen to preserve a significant portion of its development resources for the 2027 car, rather than committing heavily to further work on the current package.
That strategy has since required some adjustment following the improving competitiveness of first Ferrari and then McLaren. Mercedes has consequently been forced to reconsider how much of its available budget should still be invested in 2026.
The shift is consistent with Toto Wolff’s recent confirmation that Mercedes had moved significant resources towards its 2027 project before the summer, leaving the team to balance its long-term priorities against the need to defend its current advantage.
Malaysia aerodynamic upgrade was not originally planned
That compromise can also be seen on the aerodynamic side. Mercedes is expected to introduce another update in Malaysia, despite that development not being part of its original plans for the season.
Limiting the ADUO intervention to the turbocharger can therefore be viewed as part of the same compromise: Mercedes is trying to extract additional power unit performance without diverting excessive resources away from work already planned for 2027.
The situation is unusual because Mercedes is hardly chasing from the back. Its W17 has already established itself as the benchmark package for much of the campaign, with the team combining a powerful power unit with one of the strongest chassis on the grid.
The scale of that advantage has already prompted discussion over just how dominant the Mercedes W17 has become as Kimi Antonelli and George Russell continue to deliver at the front.
ADUO upgrade could strengthen an existing Mercedes advantage
In that context, the new turbocharger represents less of a recovery exercise and more an opportunity to consolidate an existing advantage.
That is also where one of the contradictions surrounding the ADUO system becomes apparent. The mechanism was designed to provide additional development opportunities where manufacturers were measured as being behind the benchmark, helping to prevent large performance gaps from becoming entrenched.
Yet Mercedes’ eligibility under the FIA’s assessment means a manufacturer already performing extremely strongly on track can still gain access to another development step.
The discrepancy highlights the difficulty of translating a regulatory performance index into the full competitive picture seen on race weekends. Power unit performance in modern Formula 1 depends not only on peak internal combustion output, but also on turbo efficiency, electrical deployment, harvesting, cooling, software calibration and how effectively the entire package is integrated into the car.
Mercedes will now use its available ADUO opportunity in one of the same areas already targeted by Ferrari and Audi. Rather than attempting a broad redesign, Brixworth has chosen a focused turbocharger intervention that should allow the manufacturer to strengthen a package that is already setting the standard in the 2026 season.
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