DA Calculator...
Thread Starter
MBWorld Fanatic!
Joined: Mar 2002
Posts: 1,662
Likes: 1
From: South Florida
STS,FGT,12C,P85D,M4
DA Calculator...
Select the track, date, time, and this DA calculator will lookup the weather, elevation and output the DA....
http://www.dragtimes.com/da-density-...calculator.php
.
http://www.dragtimes.com/da-density-...calculator.php
.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 2,566
Likes: 7
'14 ML BT
Good stuff, thanks Fikse.
Edit:
I don't know how accurate this is, but here's the other side of the equation:
Correction factors
I like it because it "corrects" my best run in my CL55 from 12.06 at 115.8 to 11.7 at 119.2.
Edit:
I don't know how accurate this is, but here's the other side of the equation:
Correction factors
I like it because it "corrects" my best run in my CL55 from 12.06 at 115.8 to 11.7 at 119.2.
Last edited by DFW01E55; Sep 6, 2008 at 12:00 AM.
MBWorld Fanatic!
Joined: Nov 2006
Posts: 9,137
Likes: 4
From: California, USA
E63 P30, CL500 Sport
Select the track, date, time, and this DA calculator will lookup the weather, elevation and output the DA....
http://www.dragtimes.com/da-density-...calculator.php
.
http://www.dragtimes.com/da-density-...calculator.php
.
Fikse, it'd be even nicer if after selecting the track and hitting the "Get Weather Data" button, it displayed the hourly DA in an additional column.
Banned
Joined: Aug 2008
Posts: 2,587
Likes: 0
'09 C63 AMG
Guys, check out www.smokemup.com it's the NHRA's official website for DA correction.
MBWorld Fanatic!
Joined: Feb 2005
Posts: 6,952
Likes: 4
From: Hollywood CA
2011 twin turboed prius
Guys, check out www.smokemup.com it's the NHRA's official website for DA correction.
But I love the fact dragtimes has added a DA calc!!!!
WAY TO GO FIKSE, you win
Last edited by juicee63; Sep 6, 2008 at 05:04 AM.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2002
Posts: 1,662
Likes: 1
From: South Florida
STS,FGT,12C,P85D,M4
Here are some more correction factor tables breaking it down stock na, modified na and FI cars...
http://www.wallaceracing.com/altitudecorrection.htm
anyone know the formula used to produce these tables, or figure it out?
http://www.wallaceracing.com/altitudecorrection.htm
anyone know the formula used to produce these tables, or figure it out?
Good stuff, thanks Fikse.
Edit:
I don't know how accurate this is, but here's the other side of the equation:
Correction factors
I like it because it "corrects" my best run in my CL55 from 12.06 at 115.8 to 11.7 at 119.2.
Edit:
I don't know how accurate this is, but here's the other side of the equation:
Correction factors
I like it because it "corrects" my best run in my CL55 from 12.06 at 115.8 to 11.7 at 119.2.
MBWorld Fanatic!
Joined: Feb 2005
Posts: 6,952
Likes: 4
From: Hollywood CA
2011 twin turboed prius
Here are some more correction factor tables breaking it down stock na, modified na and FI cars...
http://www.wallaceracing.com/altitudecorrection.htm
anyone know the formula used to produce these tables, or figure it out?
http://www.wallaceracing.com/altitudecorrection.htm
anyone know the formula used to produce these tables, or figure it out?
The NHRA factors are simple density ratios, with sea level being zero (standard). The DA calculation is more accurate than the altitude correction because humidity and temperature are part of the equation. I think you can find all the equations here
http://wahiduddin.net/calc/density_altitude.htm
Say you run 12 seconds at 115 at standard SAE condition which is standard air pressure.
Each track over 1600 feet has a factor although 100 feet will have an effect on your run. NHRA only allows correction for tracks at a physical altitude of 1600 feet or more. This was 1200 feet but was changed in 2007.
Now lets take your exact same set up(car) and run her at 3500 feet. They simply do a ratio of what the column of air at 3500 feet pressure is vs. standard(0 feet) sea level pressure vs 3500 feet pressure. That becomes the ratio. Once again this is a simple air pressure calc and does not consider humidity or temp.
The DA calc is more accurate as it considers more variables but it also can be very inaccurate if the conditions are measured falsely.
