Quote:
Originally Posted by afterburn 549
Jump from 100 HP to 200 HP .
There will be no added 10 hp added loss.
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Losses might be 10% or they may be more or less. The SAE has concluded that every drivetrain is different and assuming arbitrary % loss is not accurate.
In real life drivers have to let their 500 hp engines loaf along (for traffic or whatever) most of the time. Drivetrain loss is a function of the power the engine is actually producing at any given time, not it's potential. Doubling the HP capacity of the engine won't materially affect transmission losses if you maintain the same driving style. Is that what you mean?
Quote:
Originally Posted by afterburn 549
That's what I am saying....these arbitrary numbers floating around....
Just changing HP can not cause more drag.
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Yes it can. More power creates more friction which creates more heat = more wasted power. Faster rotational speeds increase windage losses. This assumes you are actually using the horsepower.
"In any drivetrain component with meshing gearsets, heat generated by contact friction between the gears is a significant contributor to drivetrain loss. This is true during steady-state driving, but is far more of an issue when the throttle is mashed to the floor and the resulting thrust force and angular acceleration builds up in these drivetrain components. The heat generated by this dynamic friction is absorbed by the transmission and differential fluid as well as radiated to the atmosphere through the transmission and differential housing(s), and in some cases, via a heat exchanger or oil cooler. This absorbed and radiated heat is literally the conversion of engine torque into thermal energy because you can't technically "lose" power, but can only convert it into other things (some of our favorites being forward motion and tire smoke)."
Drivetrain Power Loss - The 15% "Rule"- Modified Magazine