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Old 02-22-2011, 08:52 PM   #18
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I'm thinking of hitting Atco this weekend, high temp of 43* DA should be minus eleventy bilion.

Sorry usa1. just had to.
I, too, am planning to go to the track this weekend. Should be 77* that day. I guess I'll work on my tan?
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Old 02-22-2011, 09:01 PM   #19
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I, too, am planning to go to the track this weekend. Should be 77* that day. I guess I'll work on my tan?
Hey, you may have some bikini babes rooting you on.

Best of luck to you.
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Old 02-22-2011, 09:16 PM   #20
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Best Corrected DA for Vegas is probably about 2700...
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Old 02-22-2011, 09:29 PM   #21
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So that's -467, as in feet below sea level?

No that would be the ATCO track........
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Old 02-22-2011, 09:31 PM   #22
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I, too, am planning to go to the track this weekend. Should be 77* that day. I guess I'll work on my tan?


It won't be that warm here for another 3 months. You certainly will be working on that tan.
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Old 02-22-2011, 09:53 PM   #23
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No that would be the ATCO track........
Get it right now, Atco is 93' above sea, can hardly get a breath at that height.
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Old 02-22-2011, 10:15 PM   #24
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I was serious, what's -467? Lol
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Old 02-22-2011, 10:35 PM   #25
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That was the DA for the conditions he was running in?
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Old 02-22-2011, 10:47 PM   #26
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I guess I don't fully understand what density altitude really is. I just assume the lower the better?
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Old 02-23-2011, 06:15 AM   #27
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Density altitude is the altitude in the International Standard Atmosphere at which the air density would be equal to the actual air density at the place of observation, or, in other words, the height when measured in terms of the density of the air rather than the distance from the ground. "Density Altitude" is the pressure altitude adjusted for non-standard temperature.
Both an increase in temperature and, to a much lesser degree, humidity will cause an increase in density altitude. Thus, in hot and humid conditions, the density altitude at a particular location may be significantly higher than the true altitude.



For drag racing this is the equalizer to compare times and speeds when racing under different conditions. Not the most accurate way to compare (it is all we have, short of racing heads up) but gives you some idea of where you may stand compared to others located in other regions of the world.
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Old 02-23-2011, 09:02 AM   #28
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yeah, i know how to search google. lol and i did. it's still pretty foriegn to me!
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Old 02-23-2011, 09:19 AM   #29
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Just depends on how high you are in elevation, so yeah Vegas is up there in elevation. Then add in the air temp, humidity, and barometric pressure and you get the DA. Best DA's are cold weather, low elevation, and even barometric pressure.
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Old 02-23-2011, 09:24 AM   #30
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yeah, i know how to search google. lol and i did. it's still pretty foriegn to me!

Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.
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Old 02-23-2011, 09:30 AM   #31
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Just depends on how high you are in elevation, so yeah Vegas is up there in elevation. Then add in the air temp, humidity, and barometric pressure and you get the DA. Best DA's are cold weather, low elevation, and even barometric pressure.
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Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.

Thanks guys.
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Old 02-23-2011, 09:34 AM   #32
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Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.
Awesome, thanks!

So everything else being equal, a DA of -xxx is better than a DA of 0?
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Old 02-23-2011, 11:41 AM   #33
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Yes. The lower the number the better. Sorry about the Yahoo response for the technical answer. I thought that is what you were looking for. There is a website that does all this for you.

http://www.dragtimes.com

You can find all the info for temp, elevation, etc. by finding the track and the day you ran.

Give it a try.
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Old 02-23-2011, 11:57 AM   #34
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Yes. The lower the number the better. Sorry about the Yahoo response for the technical answer. I thought that is what you were looking for. There is a website that does all this for you.

http://www.dragtimes.com

You can find all the info for temp, elevation, etc. by finding the track and the day you ran.

Give it a try.
yeah, i've used that already too. lol thanks. Track over here doesn't open until March 11th.:(
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