FIA Confirms Red Bull Started 2026 Engine Era With Best Power Unit, Denies Upgrade Tokens After Second Review

Look at the 2026 Formula 1 season, and the narrative seems obvious: Mercedes nailed the new engine regulations. The Silver Arrows and their customer teams have been an unstoppable force, locking out pole positions and dominating race days. If you asked anyone in the paddock who built the ultimate power unit for this new era, they would point straight to Brixworth. But they would be wrong.[1][3]

According to the FIA's telemetry, the best engine on the grid belongs to Red Bull Powertrains. And as a reward for building the benchmark internal combustion engine of the 2026 regulations, Red Bull is the only manufacturer on the grid legally banned from upgrading it.[2][4]

The stakes for the remainder of the season just skyrocketed. On Wednesday, the FIA released the results of its second Additional Development and Upgrade Opportunities (ADUO) review, covering the period from Monaco to Hungary. The governing body confirmed that no new upgrade tokens were handed out, cementing Red Bull's status as the regulatory benchmark and locking in a massive development disadvantage for the reigning champions.[1][2][4]

To understand how a team getting beaten on track is being penalized in the rulebook, you have to look at the ADUO system. Introduced for 2026, ADUO is a catch-up mechanism designed to prevent the kind of baked-in dominance that ruined the early hybrid era. The FIA measures every manufacturer's ICE Performance Index using input shaft torque, engine speed, and power output.[1][5]

The system creates a tiered handicap. If your engine is between 2% and 4% behind the benchmark, you receive one upgrade token for the current season and another for 2027, plus extra cost cap allowances and dyno testing time. If you are more than 4% adrift, you get two tokens per year.[3][4]

The FIA's data places Red Bull at the absolute top of the ICE Performance Index. Mercedes was judged to be in the 2-4% deficit window, earning them one upgrade token. Ferrari, Audi, and Honda were all deemed to be more than 4% behind, granting them two highly coveted development tokens to overhaul their hardware.[2][3][4]

The fatal flaw in the ADUO system—and the source of Red Bull's fury—is what it actually measures. The FIA's index is heavily weighted toward the internal combustion engine. But in 2026, the true performance differentiators are the hybrid systems and energy harvesting capabilities.[5]

Mercedes has built a devastatingly efficient hybrid deployment system that makes their car unbeatable over a race distance. But because their traditional combustion engine is technically weaker than Red Bull's, the rules classify them as a struggling manufacturer in need of regulatory assistance. They are being handed upgrade tokens to make the fastest car on the grid even faster.[3][5]

Red Bull did not take the initial ruling quietly. Following the first ADUO assessment after the Canadian Grand Prix, team brass requested a factual review, arguing there was "not a single data point" to suggest they held a power advantage. But the FIA's Wednesday release doubled down, stating that due to the confidential nature of this information, no further details on power unit performance index measurements will be communicated.[1][2]

Rivals are already weaponizing the loophole. Ferrari, armed with two upgrade tokens, is reportedly redesigning its turbo configuration. Because the FIA recently altered start procedures to allow some hybrid power off the line, Ferrari is using its ICE tokens to directly boost its hybrid deployment—a masterclass in exploiting the exact blind spot Red Bull is complaining about.[5]

The long-term consequences of this ruling will define the next two years of Formula 1. Red Bull is now locked into its current engine specification, forced to watch as Mercedes, Ferrari, Audi, and Honda deploy millions of dollars in extra development time to close the ICE gap while maintaining their hybrid advantages.[2][4]

For a regulation set designed to artificially level the playing field, the ADUO system has instead created a high-stakes arms race where the actual fastest cars are being subsidized by the rulebook. Red Bull started the 2026 engine era with the best power unit on paper, but they are about to find out exactly how much that paper is worth against upgraded rivals.[3][5]