for reference
"Ideally, every dyno pull would be done under identical atmospheric conditions. This is seldom the case, so a power correction factor (CF) is applied to a measured power reading to compensate for changes in barometric pressure, temperature, and humidity. Theoretically, the power CF helps make it possible to compare dyno runs performed at different locations and under different atmospheric conditions, but it is not 100% accurate. The most common correction factors used are STD (Standard), SAE (Society of Automotive Engineers), and DIN (Deutsche Industrie Norm). Less common are EEC, JIS, and Uncorrected. SAE uses less favorable atmospheric conditions than STD or DIN, and it is the most frequently used for rear wheel testing, however STD is becoming more common. Lower correction factors also tend to be more accurate. It is important to remember however that a CF is only intended to compensate for small atmospheric differences and doesn’t correct for other factors, such as engine and oil temperatures."
