RR/dyno transmission losses

[Ruan]

I believe they do a bunch of computer simulations and therefore know pretty well what kind of power a certain engine configuration will produce even before the first prototype is built.

Oh absolutely, they know precisely what power the engine will produce before it's even been seen in the metal!

The engine dynomometer is MOSTLY for endurance/reliability and emissions testing purposes - the fact it gives a power reading is fairly inconsequential!

And up until a few years ago, run it on the thinnest oil they could, with the water pump and all the ancillaries disconnected to get the best figure for the marketing guys

And for FI engines - shove a shit off air compressor down the air intake - ultra low losses!