Correct measured power to a standard (SAE / DIN / EWG) from air pressure, temp and humidity.
Air pressure, temperature and humidity at the time of the dyno run.
SAE J1349 is common in the US; DIN/EWG in Europe — each uses different reference conditions.
Multiply your measured power by the correction factor to get the standard-corrected figure.
It scales the power measured in the day's air conditions to a fixed reference (standard pressure, temperature and humidity) so runs on different days are comparable. Corrected power = measured x correction factor.
SAE J1349 (990 mbar, 25°C, dry-air corrected) is the modern US standard; DIN 70020 and EWG 80/1269 are common in Europe and reference 1013 mbar. Always state which one a graph used.
Water vapour displaces oxygen, so humid air makes less power. SAE J1349 corrects to dry air, which is why humidity is part of the formula.
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