Quote:
Originally Posted by rayhawk
It is not a guess, it is mathematically determined based on the rpm, or revolutions per minute. Horsepower can be measured, you just have to measure the force applied PER UNIT TIME. Every measurement, even torque, has to be converted based on the load cell voltage change and put into a meaningful scale. Record time at the same time and you get hp. Oh and James Watt didn't guess anything, it was an average value which may have started out somewhat arbitrary but take my word for it, it is well defined. Also, again, you said the FORCE, but HP is not a force, it is a unit of POWER, or a force applied over a given amount of time.
With a torque wrench, you could apply 100 ft-lbs of torque using your arm at a near static speed, but I seriously doubt you could do it at 5250 rpm, which would require HP= 5250*100/5250 = 100 hp.
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Awesome reading for sure, but all I have ever read states that James Watt
estimated the force the mill horse used to turn the wheel. Some argued about what kind of force. Some argued about the number given. I have yet to read anything that says his number is dead on accurate. Actually, I see where you say somewhat the same thing, lol. When did the number become definitive? I could have very well missed something.
I'll agree that using the standard equation given, horsepower can be measured, as a derivitive(< I know I butchered that spelling, lol) of torque. Which, again, is what I've understood to be what chassis dynos actually measure.
To be honest, I can see the Mustang making 425. It makes much more sense to compete with the big dog of Camaro, not fall in between them. Yet, the track numbers hint at the 412 number, and weight savings, gear ratio, overcoming the extra horsepower.
I guess in the end, I still call bs on the dyno pull, lol. My experience lends itself to the fact, in my case, my car throws up bigger numbers in lower gears compared to 1:1. I think that they need to redyno the car in 5th, and set the record straight.
Also, quick props to rayhawk and syr74, way to keep this discussion way above board. I've enjoyed it, even if I'm proven to be wrong in the end, lol!
