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Oh So Close....
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<blockquote data-quote="357cstang" data-source="post: 7981121" data-attributes="member: 66420"><p>They are different correction factors for the conditions. Dynos read numbers at the rear tires, in an uncontrolled environment. Those of us at sea level, make more power. Cold air means more power. In an effort to make the playing field level, there are correction factors which take the temperature, humidity and barometric pressure into account and standardize them.</p><p></p><p>Here's a good read:</p><p><a href="http://wahiduddin.net/calc/cf.htm" target="_blank">Equations: Dyno Correction Factor and Relative Horsepower</a></p><p></p><p>And here's an example of the same three runs with the most common correction factors (SAE, STD and UNCORRECTED)... where Uncorrected corresponds to the actual wheel horsepower measured.</p><p></p><p>690 SAE:</p><p>[ATTACH=full]1013451[/ATTACH]</p><p></p><p>Same run on STD:</p><p>[ATTACH=full]1013452[/ATTACH]</p><p>Picked up a cool 22HP</p><p></p><p>Same run Uncorrected:</p><p>[ATTACH=full]1013453[/ATTACH]</p><p></p><p>Finally, you can see how it's possible to pickup HP just by changing the smoothing value.</p><p></p><p>[ATTACH=full]1013454[/ATTACH]</p><p></p><p>This why you have to be extremely cautious when reading numbers online. Vendors and shops can advertise great gains, and even produce results... but I just showed a gain of 41HP by manipulating the dyno program.</p></blockquote><p></p>
[QUOTE="357cstang, post: 7981121, member: 66420"] They are different correction factors for the conditions. Dynos read numbers at the rear tires, in an uncontrolled environment. Those of us at sea level, make more power. Cold air means more power. In an effort to make the playing field level, there are correction factors which take the temperature, humidity and barometric pressure into account and standardize them. Here's a good read: [url=http://wahiduddin.net/calc/cf.htm]Equations: Dyno Correction Factor and Relative Horsepower[/url] And here's an example of the same three runs with the most common correction factors (SAE, STD and UNCORRECTED)... where Uncorrected corresponds to the actual wheel horsepower measured. 690 SAE: [ATTACH=full]1013451[/ATTACH] Same run on STD: [ATTACH=full]1013452[/ATTACH] Picked up a cool 22HP Same run Uncorrected: [ATTACH=full]1013453[/ATTACH] Finally, you can see how it's possible to pickup HP just by changing the smoothing value. [ATTACH=full]1013454[/ATTACH] This why you have to be extremely cautious when reading numbers online. Vendors and shops can advertise great gains, and even produce results... but I just showed a gain of 41HP by manipulating the dyno program. [/QUOTE]
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