Reply to "horsepower loss through the ZF"

BD,
I'm not an expert on this one - but I know the basics.

This was a rolling road type dynamometer.
It measures the power output at the wheels.

At the end of the test they do a 'run down' test which gives them a value for the drive train losses. This value is used to calculate the engine power.

If properly done this should give an accurate measure of the engine power.

If you took your engine out and measured on an engine dynamometer the reading should be very much the same as the calculated engine power reading from the rolling road dynamometer.

The whole thing is inexact as even your tyre pressures will affect the dyno reading.

There is a nice explanation this stuff on this web page:
http://www.emeraldm3d.com/em_r_road.html

Lastly - to add my 2 cents.
Though it sounds logical that the losses are fixed - it's still the same transmission etc - it cannot be. This would mean producing more than 100bhp just to move the car at walking speed. There are plenty of small cars produce far less than 100bhp - could their losses be so much smaller than a ZF.