When we want to buy a second hand vehicle and we find the vehicle we are looking for, we immediately go to the appraisal centers. In addition to many tests, a dyno test is performed in these centers. and this test is done with the help of dynamometers.
Dynamometers are a big part of the testing process for new vehicles as well as modified vehicles, providing full power, torque and rpm readings and aiding in powertrain calibration. The vehicles are connected to the dynamometer and, as they accelerate in different gears, the wheels spin on stationary rollers that record the required numbers. But because Bugatti’s hypercars have extreme power, the French brand had to develop its own special dynamometer and released a great video of the process.
Chiron Super Sport’s four-turbo W16 engine officially produces 1,578 horsepower and 1,180 Nm of torque, which is sent to all four wheels via a seven-speed dual-clutch transmission. These numbers mean that Bugatti needs a dynamometer that measures the car from all four wheels rather than just one axle, and that the dynamometer has one large cylinder for each wheel instead of two smaller ones. Having a single point of contact is more like a real road surface, plus there is less performance loss and the tires heat up less than on a two-cylinder dynamometer.
Bugatti’s dynamometer can achieve real speeds of up to 248 mph (400 kmph). Although the Super Sport at 420 kmph is still 20 kilometers away from its top speed, the tires spin more than 50 times per second and apply forces approximately 4,000 times greater than the acceleration of gravity. But the dynamometer can simulate speeds of up to 480 kmph, where the car can still safely slow down. Bugatti says the Chiron Super Sport is the only production car that can truly push the limits of this new dyno.
The dynamometer, which has a gigantic size and weight, weighs 3.5 tons per cylinder. The rear axle cylinder can also be hydraulically extended or shortened to suit the car’s wheelbase. A system developed with Bugatti that includes a frame and four adapter plates secured to the bottom of the vehicle’s carbon fiber monocoque body with 20 high-strength screws holds the vehicle in place. The plates are connected by cross chains that can withstand up to 24 tons of pulling force, while additional belts are located on the sides, which perfectly fix the car’s wheels to the center of the rollers. All this means that the Chiron can be safely operated on the dynamometer even at full load and at top speed.
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