Originally Posted by DirtyD
STD dyno numbers are what your car out down at that exact time, on that day, in those conditions. Basically incorrect end. Colder atmosphere yields higher STD numbers that a hotter atmosphere. SAE applies correction factors to the numbers to account for atmospheric conditions, locations, etc. So as long as the car is dynoed in the same configuration in both conditions, the SAE numbers should read pretty close to each other (within 5 HP I'd say...)
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Actually there are 3 common correction factors, STD, SAE, and Uncorrected. Uncorrected is how much hp the vehicle made that day at that time on that dyno. STD and SAE both take that uncorrected number and multiply it by a correction factor to give the best reading of what the vehicle would make in ideal conditions. Each give hp numbers by using load, rpm, etc and inputting them in a mathematical equation. Dyno numbers will vary dyno to dyno, day to day, engine temp to engine temp. There are so many variables that WILL cause numbers to be different its un real. You can almost literally make a dyno read any number you wish. We have set ours up to give the most accurate numbers possible and we maintain it to ensure its calibration is precise at all times. A lot of shops do not properly maintain their dynos thus causing variations.