Tag Info

New answers tagged


The federal test procedures for vehicle emission certification(FTP) is run on a dynamometer. It starts with the vehicle at an exact temperature and barometric pressure and humidity. It is run in a lab that has carefully controlled exact air conditions that are maintained throughout the test. The vehicle is kept is stored at the test temperature for hours ...


In my home state of Colorado, we are required to get emissions tests on our vehicles every two years (after they are a certain number of years old). They way they do this is they place the car on a dynamometer (like a treadmill), put the car in gear, and bring the wheels up to a certain speed. They have a fan placed in front of the car to help cool it down ...

Top 50 recent answers are included