Density Altitude and its effects on ET's

[Tim2002GT]

Well, tonite I went to the dragstrip and ran 4 passes. All between 14.09 and 14.15. I couldn't get it into the 13's to save my life. I even had drag radials.

So my question is, with a DA of about 2300ft. and humidity at 76%, how much did that affect my times. My MPH was down also about 2-3 mph. I ran a 13.71 @ 101 about a month ago. It was a real nice day. Not sure about the DA, but the temp was about 76* and the track altitude is roughly 660ft. I think the humidity was in the 20's that day too. Any help would be appreciated!

Oh yeah, my 60 ft's weren't too far off on the two days either. I ran a 2.019 with the 13.7 and a 2.03 with the 14.09.

 

[Stan Weiss]

The humidity is used to calculate the DA. based on the factory / FORD rating you will have lost about 3% of your HP. Based on the Corrected HP from most dyno's you will have lost about 7.75% of your HP off of a standard day.

 

[SilverBullet00]

Go here -

do this one
http://www.************.com/density2.php

and then take the number, and do this one
http://www.************.com/density.php



EDIT -the stars are blocking out m0dular d3pot

 

[flyboy86]

You think an elevation of 660 feet is bad? Try 7,248 ft.

 

[Stan Weiss]

Without knowing your car or engine. The difference between your 14.09 and the 13.71 is about 7-7.5% HP loss. With this run at around 2300 ft DA your other runs should have been at around 300 ft DA.

 

[Tim2002GT]

You think an elevation of 660 feet is bad? Try 7,248 ft.

No, it is actually a great place to race! I was only hoping to improve on my old time and wasn't having any luck no matter what I tried.

I don't even want to think what I would run at 7,000ft.!