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      05-10-2012, 02:33 PM   #86
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Drives: E92 M3
Join Date: Sep 2006
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Originally Posted by CanAutM3 View Post
Again, we are saying the same thing. It is what I am implying all along: horsepower is what counts for performance.

Power on the input and output sides of a gearbox will remain the same (disregarding losses), however torque will not (unless it is a 1:1 ratio gearbox).

I do not need to read forums to get educated in my field of work. I am an aerospace engineer specialized in engines. I have worked a big chunk of my career in the test department around dynos doing power calculations all day long. I can assure you, power is a mathematical concept. You cannot measure power by itself (same as energy for instance). Power is the rate at which energy is used. You need to combine more than one measurable element to derive power. Force x distance / time, electrical tension x current, etc... There is no such device as a pure "powermeter" .
I certainly was not questioning your background but imprecise language.

Not being able to measure something directly and that thing being only a mathematical or derived quantity is not the same thing. Power is no less derived nor mathematical than torque. Torque is a force acting at a distance, thus you have to measure the force not the torque. In addition you can measure power through luminous intensity, temperature change, voltage and current, etc. Power is defined by equations but it is a very real and useful physical quantity.

We may be into semantics at this point...

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