Plessier and Garfield’s first attempt at producing a record breaker took the 40CV Type MC, tapered the rear of the body, removed the wings and windscreen and modified gearing to increase the top speed from 135 to 175kph. The car immediately broke the 24-hour record, covering 3,384.74 km at an average speed of 141.03kph. The difference in achievable speed and real speed over 24 hours was explained by refuelling and tyre-change stops. In response, Plessier and Garfield virtually invented the pit stop, getting their crew to improve fuel stops to under 50 seconds.