Quote:
Originally Posted by v3.2mc
the text below if from Hotrod...
Many factors that influence test accuracy are common to all dynos, including engine dynos; these include temperature, airflow, barometric pressure,
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These parameters are not so much an influence on the dynometer, but on the poweroutput of the engine
But the rest of the story gives a good picture.
A dynometer value itself says nothing; it's a fictional number.
Tuning your car and doing different dyno runs give an insight in the gains achieved, and when you want to compare, you should have a (verifiable) and documented list of runs from other cars on that same dynometer (under similar circumstances). Only then you can have an insight of your car's performance.