Originally Posted by BlueDonkey
So, it's calibrated for the standard definition of a unit horsepower and a unit torque? Nothing to do with correcting for atmosheric conditions?
Generally you are correct Actually depending on the dyno and all the extra sensors you put with it you can get all sorts of data based. For example with known weight of your car you can dial in actual drag through the air to gain Top speed and 1/4 mile times. The MD Dyno I go to in Greenville is only a 1/10 of actual times from his estimated times on the dyno program.