How Much Does Density Altitude Affect ET

[Mike Pearson]

Originally Posted by 340Cuda

So at the same DA the percent of oxygen can be different?

How do you measure the percent of oxygen?

Thanks

You have to have a weather station that measures the percent of oxygen. I know Altronics has them as an option.

I mostly look at the humidity and the barometer to make comparisons. The 327 engine that I am running is much more difficult to dial than the 350 that I have. Must have something to do with the shorter stroke.

[SSDiv6]

Patrick Hale's book is very helpful and has lots of information on this subject.

http://www.dragracingpro.com/site/90...ooks.html#2859

[pmrphil]

Originally Posted by SSDiv6

Patrick Hale's book is very helpful and has lots of information on this subject.

http://www.dragracingpro.com/site/90...ooks.html#2859

the link doesn't work for me ???

[340Cuda]

Originally Posted by pmrphil

the link doesn't work for me ???

Try this one...

http://www.dragracingpro.com/Books.html

[pmrphil]

Originally Posted by 340Cuda

Try this one...

http://www.dragracingpro.com/Books.html

thanks

[vic guilmino]

What do you use.
DA OR CF
AND WHY

[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.