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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteJCB’s Dieselmax and Hydromax projects show Bonneville’s continuing importance as a proving ground for propulsion-specific land-speed records—not that it holds the outright land-speed record. Dieselmax recorded 350.092 mph over a flying mile in 2006; in 2026, Hydromax reached a provisional 406.320 mph hydrogen internal-combustion record there. The outright record remains 763.035 mph, set by the jet-powered ThrustSSC at Black Rock Desert.
What speeds did JCB’s Bonneville cars reach?
The figures refer to different distances, record categories and governing bodies, so they are not interchangeable. The FIA’s Category A list gives Dieselmax separate mile and kilometre results. Hydromax’s 2026 FIA result is provisional, while its earlier Speed Week figure was an SCTA class result reported by JCB.
| Vehicle and result | Speed | Distance or category | Status and source |
|---|---|---|---|
| JCB Dieselmax, 2006 | 350.092 mph | Flying mile | Listed by the FIA for Bonneville on 23 August 2006. FIA Category A record list |
| JCB Dieselmax, 2006 | 350.452 mph | Flying kilometre | Separate FIA-listed result for Bonneville on 23 August 2006. FIA Category A record list |
| JCB Hydromax, August 2026 | 368.347 mph | SCTA Blown Gas Streamliner (AA/BGS, 500+ cubic inches) | Class result reported by JCB during Bonneville Speed Week; not the later FIA result. JCB report |
| JCB Hydromax, 2026 | 406.320 mph (653.909 kph) | Flying mile/kilometre; hydrogen internal-combustion vehicle category | Called a provisional world record by the FIA, pending ratification by its Land Speed Records Commission. FIA announcement |
Did Hydromax break Dieselmax’s record?
Yes, in the broad sense that Hydromax recorded a higher speed in a different propulsion category: JCB’s hydrogen internal-combustion streamliner reached a provisional FIA category record of 406.320 mph, above Dieselmax’s FIA-listed 350.092 mph flying-mile result. It is not a like-for-like comparison of the same vehicle or propulsion class. Dieselmax’s mile figure is an FIA-listed result; the 2026 Hydromax figure remains provisional in the FIA announcement.
Before its FIA attempt, Hydromax also made a separate 368.347 mph SCTA Blown Gas Streamliner class run at Speed Week, according to JCB. The company reports that the two runs were 367.141 and 369.554 mph. Those figures belong to the SCTA class result, not the later FIA provisional record. JCB’s Speed Week report
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How was Hydromax’s FIA result measured?
For the FIA attempt, the rules required two one-mile runs in opposite directions, with their average determining the record. FIA officials and ACCUS oversaw technical, sporting and timing procedures. The FIA’s 11 August 2026 announcement described the 406.320 mph result as provisional while its Land Speed Records Commission considered ratification; it should not be presented as ratified unless an official confirmation updates that status. FIA announcement
What is Hydromax, and what makes its record distinctive?
JCB describes Hydromax as a 32-foot, twin-engined streamliner powered by production-based JCB hydrogen internal-combustion engines. The company said the engines were being turned up toward a combined 1,600 hp before the FIA attempt. These are manufacturer-provided project specifications, not independent measurements. JCB Hydromax project page JCB Speed Week report
Hydrogen combustion and hydrogen fuel cells are different technologies. JCB’s project page compares Hydromax’s result with a 303 mph hydrogen fuel-cell mark; that is a comparison made by JCB, not the same record category. The 406.320 mph FIA figure is specifically for a hydrogen internal-combustion-powered vehicle, not every kind of hydrogen-powered vehicle. JCB Hydromax project page
Is Bonneville still the home of the outright land-speed record?
No. The FIA identifies the outright record as 763.035 mph, set by Andy Green in the jet-powered ThrustSSC at Black Rock Desert in October 1997. That is a different record from Dieselmax’s diesel mark and Hydromax’s hydrogen internal-combustion category result. Bonneville remains a landmark venue for JCB’s records, but the FIA’s listed outright record belongs to a different car, propulsion type and location. FIA announcement
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Why Bonneville still matters to JCB’s story
Bonneville links two JCB campaigns separated by twenty years: Dieselmax’s 2006 diesel records and Hydromax’s 2026 hydrogen record attempt. The venue’s continuing significance is clearest when the claim is kept specific: it hosted major JCB propulsion-class achievements, rather than the outright land-speed record. FIA Vice President for Sport, North America Daniel Coen described Bonneville as an iconic motorsport location where another chapter of land-speed-record history was written. FIA announcement
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