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Old 12-13-2019, 09:12 PM   #21
HR9121
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Default Re: How Much Does Density Altitude Affect ET

Typically 200 in DA equals 1 hundredth to my car but humidity and water grains can play a huge factor. An example would be if say the humidity went up say 15% then it may only take 150 in DA to equal the same .01
Data and lots of it can never be underestimated, I have 5 or 6 log books full of it on this combination so if you come by my trailer and see log books scattered everywhere you know I'm lost on what to dial lol!
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Old 12-13-2019, 09:25 PM   #22
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Default Re: How Much Does Density Altitude Affect ET

I found simply typing the data from my hand held “weather station” into Crew Chief Pro software predicts my old car pretty much dead nuts, after three passes data at a given track. Mine does not give oxygen data. Appears to me it is not that important. I’m very old, of course, so probably just do not know.
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Old 12-13-2019, 09:56 PM   #23
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Default Re: How Much Does Density Altitude Affect ET

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Originally Posted by Ralph A Powell View Post
With a oxygen meter there was a company in the Baltimore area the sold them. I will do some digging and post there name.
computech ?
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Old 12-13-2019, 10:31 PM   #24
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Default Re: How Much Does Density Altitude Affect ET

Racing in these two different conditions: Which one will you be quicker and faster in?

1. 29.00 Baro 900 feet DA
2. 29.80 Baro 900 feet DA
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Old 12-13-2019, 11:26 PM   #25
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Default Re: How Much Does Density Altitude Affect ET

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Originally Posted by HP HUNTER View Post
Racing in these two different conditions: Which one will you be quicker and faster in?

1. 29.00 Baro 900 feet DA
2. 29.80 Baro 900 feet DA
Is this a TRICK question...?
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Old 12-13-2019, 11:31 PM   #26
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Default Re: How Much Does Density Altitude Affect ET

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Is this a TRICK question...?
No.
;-)
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Old 12-14-2019, 12:11 AM   #27
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Default Re: How Much Does Density Altitude Affect ET

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No.
;-)
I didn’t think so ......
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Old 12-14-2019, 07:13 AM   #28
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Default Re: How Much Does Density Altitude Affect ET

Have not had a chance to look yet but as I remember
Engineered Specialties?




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computech ?
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Old 12-14-2019, 09:33 AM   #29
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Default Re: How Much Does Density Altitude Affect ET

29.80 will be faster. Barometer trumps everything, except wind.
That’s why sea level tracks are always fast.

QUOTE=HP HUNTER;603829]Racing in these two different conditions: Which one will you be quicker and faster in?

1. 29.00 Baro 900 feet DA
2. 29.80 Baro 900 feet DA[/QUOTE]
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Last edited by Gmirza; 12-14-2019 at 09:45 AM.
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Old 12-14-2019, 11:33 AM   #30
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Default Re: How Much Does Density Altitude Affect ET

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Originally Posted by Lenny5160 View Post
There are many different combinations of Temperature, Relative Humidity, and Barometric Pressure that will give you the same Density Altitude, say 2500 feet. The car should perform similarly in any of those combinations that equate to a DA of 2500 feet, but it can vary depending on the exact makeup of those measures.
At first I thought there was a conflict in this statement. However are you saying at the same DA the car will perform similarly but not exactly the same depending on the differences in the factors that determine DA?
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