Where F1 Engine Technology Stands Today
Modern Formula 1 power units are tightly controlled hybrid systems, designed around efficiency and parity as much as outright speed. The FIA’s Additional Development and Upgrade Opportunities (ADUO) framework is intended to help manufacturers who fall behind the benchmark catch up. Crucially, the current method for ranking engines focuses on a simple metric: the horsepower produced by the internal combustion engine. Proposals to factor in turbo dimensions, pressures, plenum temperatures and other installation-dependent parameters were offered during discussions with power unit manufacturers, but were ultimately rejected to keep the process straightforward. This means that any perceived deficit linked to packaging choices, such as smaller turbos or specific exhaust concepts, is not accounted for in the official hierarchy. As a result, F1 engine upgrades are being evaluated through a narrow lens, even as teams argue that real-world Formula 1 performance depends on a broader mix of hardware and integration choices.
Why Larger Battery Capacity Is Back on the Agenda
The 2026 ruleset introduces power units that are more electrically biased, with reduced energy harvesting and new deployment profiles. Early simulations suggested uncomfortable side effects: pronounced speed drop-off at the end of long straights and more frequent energy shortfalls over a lap. Tweaks agreed for Miami, including extending super clipping to 350kW, aim to reduce these quirks and allow drivers to influence qualifying with driving skill rather than purely deployment strategy. However, McLaren team principal Andrea Stella believes more “substantial” progress would require changes to the hardware, notably greater battery capacity. A larger energy store could reduce the sense of an “energy-starved” formula and restore more traditional, flat-out driving, especially in high-speed corners where deceleration and energy use currently feel constrained. While this avenue could materially enhance Formula 1 performance, Stella cautions that such F1 technology changes demand long lead times and cannot be implemented race-to-race.
The Case for Increased Fuel Flow and Stronger ICE Power
Alongside battery discussions, teams are exploring whether increased fuel flow for the internal combustion engine could complement hybrid power and improve the overall spectacle. Stella points out that under current constraints, teams will always optimise for lap time, even if that means strategies that are less intuitive for fans, such as managing deployment carefully rather than simply driving flat out. Allowing the ICE to accept more fuel flow would raise mechanical power and potentially reduce reliance on finely tuned electrical deployment windows. This could narrow speed differentials between cars during races and bring back more natural, continuous acceleration profiles. Yet altering fuel-flow limits is not a minor calibration tweak; it would require rethinking cooling, reliability margins and fuel consumption targets across the grid. As with battery capacity, these engine hardware changes are being actively debated, but any implementation would likely align with a new regulatory phase rather than an immediate update.
Balancing Fairness, Complexity and the Show
The FIA faces a delicate balance: maintaining fairness between manufacturers, keeping rules understandable, and delivering entertaining racing. Nikolas Tombazis notes that he would personally be open to a more complex ADUO metric that includes elements like turbo behaviour and exhaust back pressure, but manufacturers previously preferred a simpler, horsepower-based system. This choice keeps engine ranking transparent, yet it overlooks how car installation can compromise or enhance a given power unit. On track, McLaren’s Mark Temple expects that, even with the Miami tweaks, drivers will still need to think strategically about where to use limited energy, similar to historic fuel-saving races. The goal of upcoming F1 engine upgrades and broader F1 technology changes is to widen the operational window so that drivers can push closer to the limit more often, preserving strategic depth without sacrificing the visceral sense of cars being driven flat out.