yeah man, hp #'s from a dyno are all relative. it's not like a scale where 1 pound equals exactly one pound, or like a ruler where 1 inch equals everyone elses 1 inch. there are so many variables in different dyno setups that comparing one reading from one dyno to another reading from another dyno is almost pointless. the amount of variables are great, everything from ambient temperature to current barometer and altitude not to mention all the variables in actual dyno calibration and compensation on the softwar side of things. basically a dyno operator can alter the baseline at will and affect the end hp #'s generated. a dyno is only accurate to itself. for example if you do 3 pulls and average it, then change something and do 3 more pulls and average it, the resulting % increase or decrease is acurate. this is the main use and purpose of a dyno, comparing itself to itself. hp numbers are relative because all dynos are not calibrated to each other the way a scale or a ruler would be.
