The notable speed record was set in 1988 under the auspices of "Project 400". With that project, Welter set out to build the first car to do 400 km/h (248.54 mph) during the 24 Hours of Le Mans. That year, Welter's low-drag configuration WM Peugeot P88, including moving the radiators and intercoolers; combined with novel ducting, driven by Roger Dorchy, achieved on the Mulsanne Straight. Having struggled with reliability for the entire event, problems with the car for the whole weekend (turbocharger, cooling and electrical) finally ended their race.