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There was a post awhile ago and somebody said that it's about 4%.
 

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Gotta know the conditions on the day of the dyno. STD to SAE can be higher or lower. Depending on the temp/humidty etc. Like if it was 95+ degrees when dynoing the SAE numbers will be higher then STD. If its 65 degrees, the SAE numbers can be lower then STD.

So if you know the weather conditions of the day. Then ya, u can somewhat figure out SAE numbers. I don't know the formula tho. www.dynojet.com might have the formula.
 

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Discussion Starter #4
It was in December. I would guess 40 degrees. Humidity I don't know. Avg is . . . 40% maybe???
 
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