To add to the above, there are so many factors that go into a dyno reading, inlet temps, humidity, altitude, etc. To do a completely accurate test the conditions have to be identical. Any differences in conditions can alter the outcome of an accurate reading. The best way we can do it is to get as close as possible. It doesn't make sense to wait until conditions are identical; this would take forever. You just have to take into consideration how the conditions are altering the reading. For instance if you dyno here at 300whp in 60 degree weather in the spring and then add an intake over the summer and dyno here again and make 295 in 105 degree weather, does this mean you lost 5whp by adding an intake? Don't get too caught up in the numbers game, it will drive you crazy.
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