THE BREAKDOWN JCB Hydromax set a provisional FIA flying-kilometer average of 406.320 mph at Bonneville. It is powered by two production-based JCB hydrogen combustion engines tuned to a combined 1,600 horsepower. JCB Hydromax has pushed hydrogen power deep into four-figure territory, setting a provisional world land speed record of 406.320 miles per hour on the Bonneville Salt Flats in Utah. The new record falls under the FIA’s Category A, Group XIV, Class 7 World Flying Record Start Land Speed Record, and remains subject to official confirmation by the FIA before it becomes fully certified. The Bonneville record attempt followed a warmup appearance at the Southern California Timing Association’s Bonneville Speed Week.