Quote:
Originally Posted by freebeard
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* Road Load Horsepower leaves 'mechanical' drag outside, dealing solely with rolling resistance and aerodynamic drag, by definition.
* To go from the Road Load Horsepower to Brake Horsepower, you would introduce all the transmitted power inefficiencies between the tire/road interface, and engine's flywheel, including any engine-driven accessories ( differential, wheel bearings, CV-Joint shafts, propeller shaft, transmission/ transaxle, power steering pump, water pump, alternator, AC compressor, etc. ).
* EV power electronics, motor losses, transmission losses, heat pump load, cooling system pump, etc. would have to be factored in to compute an EV's 'brake' kilowatts and BSFC-e, on top of its Road Load Horsepower/ Kilowatts.