As of 2021, the fastest car that was built is the Bugatti Chiron Super Sport 300+. It holds the title for the fastest production car, reaching a top speed of 304.773 mph (491.110 km/h) on August 2, 2019, at the Ehra-Lessien test track in Germany. The car was driven by Andy Wallace, a professional race car driver.
The Bugatti Chiron Super Sport 300+ is powered by an 8.0-liter quad-turbocharged W16 engine that produces 1,578 horsepower and 1,180 lb-ft of torque, it has a 7-speed dual-clutch transmission. It has an aerodynamic design, which helps it to achieve high speeds, and it also has advanced electronic stability control systems that help to keep the car stable at high speeds.
It’s important to note that top speeds of production cars are generally measured in controlled conditions like on a race track, and are not achievable in everyday driving conditions. Also, the Bugatti Chiron Super Sport 300+ is not street legal, it’s only built for track use.
Other notable contenders for the title of the fastest car include the Hennessey Venom F5, which claims to have a top speed of 301 mph (485 km/h), and the Koenigsegg Agera RS, which achieved a top speed of 277.87 mph (447.19 km/h) in 2017.
It’s important to note that the fastest car on the road is a relative term and can change as technology and engineering advancements are made. Also, the top speed records are set in controlled conditions, and in the real world, the cars performance and speed will be affected by various factors such as weather, road conditions, and traffic laws.