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bazhart said:If there are opinions on the relative accuracy or reliability of the results of rolling road tests for "wheel power" (Pwheel) compared to "engine power" (Peng or P norm) I would appreciate their comments.
Many Thanks,
Baz
jonttt said::hand:
Its no fun when people know what they are talking about, I'll stick to the footy thread :grin:
In all seriousbness its why I never ever take any note of dyno results as I've driven cars that too often in the real world simply do not back up the figures quoted.
nb the "other factor" I have seen used to manipulate results in terms of pre set adjustments is ambient temperature readings ie dynos are calibrated to a pre defined temperature (usually around 15 degrees) and so compensate results for the actual ambient temerature. I have seen ambient temps recorded as too high on purpose so the power is adjusted up on the readout :wink:
Why are they doing this? What do they hope to achieve?bazhart said:...but I have come across an issue in which someone else is using wheel power to validate performance set against manufacturers engine power which I am investigating....