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Old 08-08-2008   #19
polishmafia
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Join Date: Feb 2007
Location: maple grove
Drives: an evo's fat korean cousin
Posts: 2,549
Re: how soes full blown motors dyno compare

Quote:
Originally Posted by M/// Guy View Post
I find it funny that some newbies who don't keep up with good grammar get ragged on, when some people that aren't newbs have even worse grammar.

Back on topic, all dynos read off. I still dont understand why there isnt a standard for horsepower measurement. It should be like a cup, or an inch.
THEIR are people here that always post THERE "there"s and "their"s incorrectly.

Back on topic.

I guess somehow (not sure exactly how) I do understand the question the OP asked.

Why does one dyno read 15% less than another? Horsepower is defined as (Wiki);

1 hp≡ 33,000 ft·lbf/minby definition

So, lets put it simply. If the same car on two different dynos puts down 33,000ft-lb/min, both dynos should read 1 HP. But from what I understand, one will read 1 HP, another will read .95 HP, another might read .86 HP.

If there is a mathmatical definition to what 1 HP is, why do they read differently?

Is it just because of "corrections" for altitude, air temp, whatever? I guess I don't understand because math is math. Its universal. 1+1 = 2, not 1.9 or 2.1.
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