Originally Posted by Toby
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.
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Very nice explaination Toby.
In the current state of the hobby, there is way too much emphasis put on dyno numbers. It's just a tool to tune a car, but more often than not it's used as a way to equate how fast a car is going to be which isn't true at all. The only true way to do that is race.