[masraum]

Originally Posted by afterburn 549

First - I said I was dense .
I never said you, or anyone else in the topic is /was.
It is truly quite EZ to repeat what we have been told.
I can do that too.
Which again is why I drool along here.......
I do understand that number thrown out for drive train loss is the 15% number.
I was using the 10%number for simplicity, as stated.
My argument (again) is-
Using the 100 hp @ crankshaft figure, it is expected to see 85HP at the wheels, if we insist on using the 15% rule.
Now we pump up the engine to 200 HP it is said we lose15% which will now equal 170 HP , linear, with 30 HP loss.
To me, going linear up the scale, -it gets ridiculous.
A 500 hp will now see 425 @ the rear. with 75 HP missing in losses.
So with the 100 HP we lose 15HP
At 500, we see 425, 75 HP now consumed in the mass somewhere.
That is one HUGE number to eat!
Stuff is going to be glowing red RED HOT right now.

Yeah, following your reason, this makes sense, but you also have to think about, the transmission for a 52hp Chevy chevette is probably, much, much smaller and lighter than the transmission for a 500hp Corvette, even if they were both 4 speeds. And when they take something like a corvette, the standard model has a tranny, but the Z06 model adds a tranny cooler. Some cars have added finned diff covers.

Some trannies will have more fluid, bigger, heavier gears which will withstand the power AND the heat better, or maybe more gears which add more mass to absorb the additional heat. Besides, I'm sure there are things that are calculated by the engineers like "Is the average corvette owner going to be at peak output all of the time or only for a few secs here and there most of the time. Do you think that the Corvettes at Le Mans use the same tranny with no additional cooling as a street 'vette. No, of course not, they use at least a cooler if not a different trans. And that's because they are always forcing max power through the trans. Since most vette owners are probably mostly loafing around at 1500 rpm using a tiny fraction of the power on tap, they aren't creating the heat or experiencing those losses