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  • 1996 - 2004 SN95 Mustang -General/Talk-

Density Altitude and its effects on ET's

  • Thread starter Thread starter Tim2002GT
  • Start date Start date May 4, 2007

Tim2002GT

Founding Member
Apr 10, 2002
635
4
29
Tulsa, Oklahoma
May 4, 2007
#1
  • May 4, 2007
  • #1
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

Member
Dec 8, 2006
347
2
16
Philadelphia, PA
May 5, 2007
#2
  • May 5, 2007
  • #2
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.
 
S

SilverBullet00

New Member
Jul 5, 2004
1,150
0
0
Wichita, KS
May 5, 2007
#3
  • May 5, 2007
  • #3
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
 
F

flyboy86

New Member
Dec 5, 2006
94
1
0
Vance AFB, Enid OK
May 5, 2007
#4
  • May 5, 2007
  • #4
You think an elevation of 660 feet is bad? Try 7,248 ft.
 

Stan Weiss

Member
Dec 8, 2006
347
2
16
Philadelphia, PA
May 5, 2007
#5
  • May 5, 2007
  • #5
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

Founding Member
Apr 10, 2002
635
4
29
Tulsa, Oklahoma
May 5, 2007
#6
  • May 5, 2007
  • #6
flyboy86 said:
You think an elevation of 660 feet is bad? Try 7,248 ft.
Click to expand...

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.!
 
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