Can I compare power numbers to the XYZ dyno at shop ABC?
Not if you want to be accurate. All dynos should theoretically report the same numbers, but unfortunately they do not. Besides the dyno itself, other factors also come into play: testing procedure and type (inertia only, step test, loaded etc), load applied by the dyno (and hence run duration and acceleration rates). Vehicle preparation (tire pressure, downward strapping pressure, tire style/type, driveline temps etc). Weather Station type and correction used (SAE or STD etc).
