Mercedes, Red Bull, and Audi Explore Off-Throttle Power for 2026 Engines
Formula 1 manufacturers face significant challenges with the 2026 power unit regulations eliminating the MGU-H component. This removal eliminates exhaust energy recovery that previously mitigated turbo lag in the 1.6-liter V6 hybrid engines. Teams now shift focus to the enhanced MGU-K, which increases output to 350 kW from 120 kW. The new rules create a near 50-50 split between internal combustion and electric power.
Mercedes, Red Bull Powertrains, and Audi reportedly investigate a concept using the internal combustion engine to generate electrical energy during lift-off phases. Special engine mapping directs partial combustion energy to the MGU-K for battery recharging when drivers partially lift the throttle in corners or chicanes. This approach maintains turbo spool and sustains closer to the full 355 kW electric deployment across laps. It counters potential energy depletion without the MGU-H.
The technique echoes early 2010s blown diffuser strategies, where exhaust flow continued off-throttle, though those faced eventual bans. Under 2026 rules, limited fuel flow of 70 kg/h and emphasis on sustainable fuels constrain exploitation. Engineers view controlled off-throttle operation as compliant, potentially delivering smoother power and reduced lag.
This development emerges as the FIA closes other loopholes, including bans on influencing fuel flow sensors via temperature manipulation. Manufacturers prioritize energy management to avoid performance drops from depleted batteries on high-speed tracks.
Six suppliers commit to 2026: Ferrari, Mercedes, Renault, Honda, Audi, and Red Bull Ford Powertrains. Early interpretations of hybrid integration could create advantages before on-track testing begins.
The concept highlights ongoing innovation in bridging the MGU-H gap while adhering to cost caps and sustainability mandates. Teams refine dyno simulations to optimize recharge without exceeding fuel limits or triggering reliability issues in higher electric demands.
