SALT LAKE CITY (AP) – A British pilot broke a land-speed record Tuesday for driving a diesel-powered car faster than anyone in the world.

Andy Green broke the supercharged diesel streamliner world record on Utah’s Bonneville Salt Flats by more than 90 mph by reaching an average land speed of 328.767 mph.

The former land-speed record for diesel engines was 235.756 mph, set by Virgil Snyder on the Bonneville Salt Flats in 1973.

“It’s absolutely astonishing what we’ve achieved today,” Green said by telephone from the salt flats, about 90 miles west of Salt Lake City.

The land-speed attempt was observed by the FIA, an international governing body of racing. FIA rules require two passes be made within an hour to arrive at an average speed. Green’s first run was clocked at 324.265 mph and his return run at 333.364 mph, said David Petrali, FIA’s representative at the 11-mile track.

The record will likely become official when a FIA board meets next month.

Green drove a vehicle powered by two large diesel engines that have a combined output of 1,500 horsepower. Each is a 4-cylinder, 4.4-liter engine used commercially in backhoe loaders. The engines are twice as powerful as ones found in a Formula One race car, but use only half the fuel.

Green said he only used about 1,200 horsepower because the vehicle couldn’t handle more than that. The tires on the car are designed to go no faster than 350 mph, and Green’s crew said the car is capable of going 400 mph. The vehicle has six gears, but only five were used Tuesday.