06-09-2010, 09:13 PM
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#9 (permalink)
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A True Z Fanatic
Join Date: Feb 2009
Location: Texas
Posts: 30,879
Drives: 370z
Rep Power: 4210
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Just grabbed this and think it might answer your question(s) but not directly.
Just how accurate is this dyno?
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"Accuracy", for many reasons, is a very relative term as far as dyno's go. Just how accurate is anyone's dyno? Take 2 motors, test them on 2 different dynos, one comes out at 100hp, the other comes out at 110hp, but they run the same lap times. Which dyno is "accurate"? Which one is giving you the correct numbers? Horsepower is simply a calculated number. Dyno 10 engines on the same dyno at 100HP, put them all in the same bike one at a time, and they all run the exact same lap times. Is the dyno accurate? No, the dyno is however "repeatable". "Repeatability" is what you want in a dyno, test the same engine time after time and get the same results. Take one of the 10 engines from above, change a pipe or a cam so you get 5% more power, run it against all the others again. It runs 5% faster, you re-dyno it and it still says 5% better, now you have an "accurate" and more importantly, a "repeatable" dyno.
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