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Message: <blockquote data-quote="naza2" data-source="post: 57416" data-attributes="member: 356">there will be differences no matter what, even if it is the same dyno at a different time during the day. but how much difference? thats another league by itself. on the dyno, there are several variables or correction factor that you have to put in. these variables are compensations for, say, transmission loss, clutch slippage, etc.  and i haven't mention about air humidity, temperature, pressure etc which will affect your running engine. that being said, the numbers, to me, is almost useless. what i'm interested in is how much improvements i.e the delta between before and after mods. as for the figures, i usually give it a +-5 to 10% off to have a real feel of it.</blockquote>