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how much does altitude affect times?

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Old Jul 4, 2011 | 12:01 AM
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adrynalinjunkie's Avatar
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Default how much does altitude affect times?

I run at 3 different tracks. Spokane is 1909 feet and my home track of yakima is 980 feet and then portland is 29 feet. If I ran a 11.5 at 2000 feet what would it equal at 1000 feet?

Where can I read on this DA stuff in simple gear head language?
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Old Jul 4, 2011 | 04:15 AM
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Here are the altitude correction factors NHRA uses, Spokane is 2300' elevation. http://www.nhra.com/competition/altitude.aspx

This is also a good site for density altitude http://www.dragtimes.com/da-density-...calculator.php

Also one of our friends car used to run 11.7x @ 114-115 in Spokane. He recently sold the car and the guy ran it at Woodburn. No changes at all except the track and it ran 11.33@119
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Old Jul 4, 2011 | 05:11 AM
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.

There is huge differences in just changing DA's.
As mentioned, several .10's especially with swings of 1000, 2000, 3000'

I have a weather station but I still use the 2nd link from drag times, just to double check.

.
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Old Jul 5, 2011 | 12:35 AM
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in colorado the elevation is 6,300ft. lucky if the da is below that and it pulls a full second off et's. that's on a nice day
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Old Jul 5, 2011 | 11:09 PM
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Originally Posted by MIKE93SVT
in colorado the elevation is 6,300ft. lucky if the da is below that and it pulls a full second off et's. that's on a nice day
Yup, I have over 500 SAE corrected RWHP and still haven't gotten into the 11's. It's hard up here.
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