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[jondee86]

gon Wrote:... on the coast down the dyno calculates the losses of your
tyres/transmission/etc.

The problem with using the coast down figure for transmission loss, is that
it does not take account of the power lost to friction when the power train
is fully loaded at WOT. The hypoid bevel differential is said to absorb from
5 to 10% of transmitted power, and obviously the power loss will be much
greater at WOT than it is at coast down with the clutch disengaged.

Idealy, power should be measured at constant rpm, to eliminate the
power lost in overcoming the inertia of the rotating parts of the drivetrain
(wheels and tyres, driveshaft etc).

However, providing you use the same dyno for each run, and try and
keep all the other variables (temperature, wheels, tyres etc) the same,
the difference between wheel hp from run to run will be a useful readout.

Who are you really fooling if you shop around to find the highest reading
dyno, just so you can "make" an extra 5 or 10 hp ???

Cheers... jondee86