I have a habit of trash talking any and all dyno threads, so for my latest I thought I'd start a fresh.
No not really , transmission losses are a percentage , the resistance goes up with the horsepower you are moving the same mass yes but quicker and so take more effort
I personally don't think you can just use a set percentage figure to calculate the bhp figure.
While hosting a rolling road meet, a stock 350z DE puts down 240whp. The next is a fresh JDM fairlady z, so jdm it still has single pot calipers. Anyways owner goes its got exhaust, larger tb, decats, tomei cams, tomei headers and manmanagement. Once warmed up the idle is a tad lumpy tbf.
Does its run and makes 250whp, well bolt on UK DE's make that with a remap? You add your percentage and hand the owner a print out for 290bhp.
Later its found that one of the rear calipers was partial siezed , maybe sat at the docks to long. So the brakes are now sorted and the car again comes back for a run and makes 265whp. Well all along the engine was 300bhp+ so was it right to simply use a % or should the losses have been calucalated through run down?