Have a look at the worlds fastest car engine. This Bugatti Chiron engine. It is a W16 engine. The Bugatti Chiron can achieve a top speed of 400 kph ie. 249 miles per hour in 42 seconds. Its is believed as the worlds fastest production car. Its read speed is unknown. But it will reach up to a top speed of 261 mph with a speed limited in place as we know.