Honda's Stealth F1 Power Unit Upgrade Unveiled
Honda Racing Corporation (HRC) has disclosed that its second significant performance enhancement, an ADUO (Additional Development and Upgrade Opportunities) focused on the turbocharger, was discreetly rolled out during Formula 1's Spanish Grand Prix. This revelation clarifies the timing of a crucial power unit improvement for Aston Martin, which had been striving to enhance its competitiveness following a difficult start to the racing season. The upgrade strategy involved a phased introduction of improvements, with the turbocharger being a key component of the second phase.
Initially, Aston Martin and Honda faced considerable challenges at the outset of the season. However, their fortunes began to shift following a substantial chassis upgrade introduced at the Hungaroring. Subsequently, in Zandvoort, the team implemented a power unit that incorporated the first ADUO enhancement. It was identified that Honda's internal combustion engine (ICE) lagged behind the Red Bull Ford Powertrains engine by more than four percent in terms of output, which permitted Honda to utilize two ADUO tokens throughout the season.
Although Honda and HRC had previously indicated their intention to use only one of the available ADUO opportunities, Koji Watanabe, the president of Honda Racing Corporation, confirmed to Autosport that both were indeed utilized. "We introduced the first ADUO upgrade in the Netherlands, and then we put a PU incorporating the second update into Lance Stroll's car at the Spanish Grand Prix," Watanabe explained. He further elaborated that the second upgrade, an improved turbocharger, was a response to certain driveability issues experienced with the Spec 2 power unit introduced in the Netherlands.
Supporting Watanabe's statements, official FIA records concerning power unit component usage show that Lance Stroll's vehicle received its fifth turbocharger of the season at the Spanish Grand Prix. Similarly, Fernando Alonso's car was also equipped with its fifth turbo, presumably the upgraded version, at the Azerbaijan Grand Prix. When queried about the specific objective of this turbocharger upgrade, Watanabe confirmed it was aimed at mitigating turbo lag, explaining the rationale behind the staggered deployment of these enhancements.
Watanabe noted, "It would have been better if we could have introduced everything at once, but it was important to introduce Spec 2 in the Netherlands first. We were also working on measures to address the turbo lag in parallel, so we introduced that in Spain." This strategic division of the upgrades was designed to optimize the team's performance trajectory. Despite these improvements, Watanabe conceded that Honda has yet to fully unlock the potential of its power unit, suggesting there is still ample scope for boosting its competitive edge.
Looking back, when Honda partnered with Red Bull, regulations restricted performance upgrades. However, Honda continually utilized simulations to push the operational boundaries of the power unit, incrementally increasing these limits each year. This process, termed "reliability development" by Honda, enabled advancements such as Red Bull's adoption of exceptionally compact sidepods in 2024 and reduced cooling airflow openings, all made possible by pushing the power unit's operational thresholds. "As far as ADUO is concerned, we have used up our opportunities for this season. From here, we will continue working on things that don't involve hardware, as well as developments that will lead into the future," Watanabe concluded. He reaffirmed their commitment to ensuring the team remains a formidable contender in the remaining races of the season, despite having utilized all available hardware development tokens.