How Much Does Density Altitude Affect ET

[HR9121]

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!

[Ed Wright]

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.

[Keith 944]

Originally Posted by Ralph A Powell

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 ?

[HP HUNTER]

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

[MR DERBY CITY]

Originally Posted by HP HUNTER

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...?

[Mark Yacavone]

Originally Posted by MR DERBY CITY

Is this a TRICK question...?

No.
;-)

[MR DERBY CITY]

Originally Posted by Mark Yacavone

No.
;-)

I didn’t think so ......

[Ralph A Powell]

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

Originally Posted by Keith 944

computech ?

[Gmirza]

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]

[340Cuda]

Originally Posted by Lenny5160

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?