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STD will always report 2-4% higher than SAE. In hot or cold weather. This comes from experiance, I've dyno'd 1000's of cars/trucks on my own dynojet over the years in hot and cold weather. SAE should ALWAYS be the correction used. To take weather out of the equation, the correction should be set to "Uncorrected"
Alot of shops set their dyno to STD and it makes the numbers hard to compare and it's where the "Dynojet reports higher numbers than the mustang dyno" *MYTH* comes from. On at least 10 honest different occasions with various mustang dynos, my dynojet will report within 5 hp/5 ft/lbs of a mustang dyno the car was on hours earlier (same day same weather)
In the end, dyno numbers mean nothing ! The dyno is nothing but a giant expensive torque wrench, it's a tool to measure before and after. The track is where you show results. People put too much stock into dyno numbers.
If everyone would run their dynojets correctly, you'd see more consistant numbers. As for the smoothness, there is adjustment in there for that too. That super smooth "Correction:5" graph would be all choppy too with no smoothness.
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