Dyno Loss

Sorry if this has been explained before (the searches I tried returned WAY too many results to wade thru), but I have a question about the 15% loss between flywheel HP and RWHP:
So the more power you make at the flywheel, the more power you lose before it gets to the pavement? How is that? The power is going thru the same componets, but at 15% loss, then I'm losing more power after mods than before mods. That would mean that the transfer of power is more efficient at lower power levels?? Or is the 15% power loss just a rule of thumb and you're actually losing much more at higher HP levels?
Hope this makes sense.
Thanks

2K1GtfromSC said:

15% is 15% no matter if you 200 hp or 800 hp it is still 15%.
15% of 200 is 170 hp -30 hp
15% of 800 is 680hp -120 hp

you loss more hp but the ratio stays the same. If this helps

Click to expand...

Right..That makes sense...I guess I'm just wondering why the loss is greater since the componets that would cause the loss are still the same.
The loss would be caused by the friction in the tranny, rearend, rotational loss, friction, friction, friction....so none of that changes if I bolt on more HP so why would the loss be greater (120hp now instead of 30hp)?