Domenicali explains how the new regulations secured Cadillac, Audi, and a new era of manufacturer interest

Formula 1 stands at an inflection point. With the arrival of Cadillac as the sport's 11th team, Audi's takeover of Sauber, and a rekindled partnership between Honda and Aston Martin, the 2026 season represents more than just regulatory change—it signals a fundamental realignment of automotive industry priorities within motorsport. At the heart of this seismic shift lies one crucial factor: the revolutionary power unit regulations that F1 CEO Stefano Domenicali has championed as transformative for the sport's future.

Domenicali's confidence in the 2026 technical direction proved prescient. Speaking to F1.com, the F1 chief expressed unrestrained enthusiasm about Cadillac's entry, stating: “Cadillac is one of the most important manufacturers in the world. They're going to invest a lot. They're going to bring new energy, and I believe that's related to the fact that we have taken the right technical decision with regard to the regulations.” This wasn't mere diplomatic praise—it reflected a strategic vision that successfully lured multiple automotive giants back to the sport.

The 50:50 power revolution

The cornerstone of Domenicali's regulatory masterclass lies in the audacious 50:50 power split between internal combustion engines and electric energy. This architecture represents a seismic departure from the hybrid systems that have governed F1 since 2014, where electrical power contributed merely 20 percent of total output.

The new paradigm reshapes everything. The 1.6-litre turbocharged V6 engine retains its core architecture but undergoes critical refinement. Most significantly, the Motor Generator Unit-Heat (MGU-H)—a notoriously complex system harvesting exhaust energy—has been eliminated. While effective, the MGU-H never transferred to road-car technology, rendering it ornamental within an industry increasingly focused on hybrid viability.

In its place, the Motor Generator Unit-Kinetic (MGU-K) has been radically enhanced, now delivering 350kW to the rear wheels, nearly triple its previous 120kW output. This electrification surge means the new generation cars will recover energy not only during braking but also while coasting and under throttle—fundamentally altering the mechanical relationship between driver inputs and power deployment.

Attracting the giants

Domenicali's regulatory framework succeeded where previous iterations struggled: making Formula 1 technologically relevant to automotive manufacturers wrestling with electrification and sustainability challenges. “The powertrain has been relevant not only to attract Cadillac, but we have Audi, we have Honda. So it's a great moment for all of us,” Domenicali reflected.

The expanded manufacturer ecosystem underscores the regulations' appeal. Mercedes and Ferrari provide continuity as established engine suppliers, but the 2026 grid welcomes five total power unit manufacturers. Ford's partnership with Red Bull Powertrains, Honda's return as a full works supplier to Aston Martin, and Audi's in-house engine development represent unprecedented diversity. Meanwhile, Renault's exit—and Alpine's subsequent switch to Mercedes customer engines—demonstrates how even departures realign the competitive landscape.

Cadillac's entry exemplifies the regulations' magnetic pull. The American manufacturer will initially run Ferrari power units, with a General Motors works engine program targeted for 2029. This phased approach reflects both the technical ambition and resource commitment the regulations inspire.

A cleaner, faster, more efficient chassis

Beyond power units, the 2026 chassis regulations fundamentally reimagine F1 aesthetics and performance. Cars will be shorter, thinner, lighter, and more nimble—design parameters explicitly aimed at improving on-track racing. This mechanical renaissance extends to active aerodynamics, where front and rear wing elements dynamically adjust between Corner Mode and Straight Mode to optimize downforce and drag management.

Driver-operated Boost Mode represents another innovation, granting pilots manual control over maximum combined power deployment from the engine-battery complex, adding a strategic dimension to race tactics.

The Barcelona shakedown

The regulatory framework's credibility received validation during January's Barcelona shakedown testing. Audi, despite fielding a single car—unlike established manufacturers running multiple customer variants—completed 243 laps over five days, demonstrating essential mileage accumulation despite the compressed development timeline.

A fascinating moment for the sport

Domenicali's broader vision extends beyond manufacturer attraction. “As always, when we introduce new regulations, it's a great moment for our world because it's exciting, and it brings attention at a level from the technical perspective,” he explained. The F1 chief highlighted how hundreds of engineers, drivers adapting to unfamiliar machinery, and teams optimizing setups create a “fascinating moment” that accelerates collective enthusiasm.

The 2026 regulations represent F1's most ambitious technical overhaul in the sport's modern era. By prioritizing sustainable fuel integration, radical electrification, and road-relevant hybrid technology, Domenicali hasn't merely introduced new rules—he's repositioned Formula 1 as an essential proving ground for automotive innovation during motorsport's most consequential technological transition.

The paddock has responded accordingly, with a 22-car grid featuring unprecedented manufacturer participation. For F1, that vindication is everything.