Quote:
Originally Posted by Coheed
Exactly right. In a way, a hp is a hp. It would be ridiculous if 1/4 mile times were affected because every country made up their own length of track. Imagine running 11.50 in USA, and 11.80 in AU, and 10.0 in EU. That's how I feel dyno numbers can be a lot of times.
At the end of the day, 550lb moving 1ft/sec is 1 hp. With a fixed measurement like that, why are some dynos reading low, and others reading high? It's like buying calculators in different countries, plugging in the same numbers and equations, and getting a different result. What a joke.
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550lb acting on a 1 ft long lever spinning 1 revolution per second you mean? (I have no idea what the correct number is)
I'm pretty sure it's a matter of calibration, and drivetrain mass. When you run a car on a dyno, the data gets fudged because you have the drivetrain accelerating, the rollers have rotational inertia, etc. So they may all be standardized and supposedly accurate to say a few percent, but then the actual amount of power they're measuring isn't so clear because not all the power makes it to the rollers in the "intended" way, whatever that is. So you can end up with huge differences.