corrected 1/4 times
Thread Starter
Pro
Joined: Apr 2007
Posts: 605
Likes: 4
From: chino ca
corrected 1/4 times
Does anybody know how to calculate corrected times for weather conditions. I recently went to the 1/4 mile and ran a 11.9@119. The weater was 91 and the DA was 3600ft. How much faster would the car be at sea level ?
Pro
Joined: Jan 2008
Posts: 710
Likes: 2
From: St. Louis Mo
I know you are just wondering, but corrected times are
Team Owner
Joined: Feb 2001
Posts: 27,252
Likes: 133
From: Short Hills, NJ
Traction (or lack thereof), wind conditions, one's inability to properly adapt to the new/different atmospheric conditions, you can only get a remotely rough estimate.
Oh and btw, this thread will turn into a raging sh|t storm in approximately 10 posts.
Thread Starter
Pro
Joined: Apr 2007
Posts: 605
Likes: 4
From: chino ca
I just noticed that my 1/8 mile times were about 3 tenths and 3 mph off. I'm usually at 7.5 7.6 95-96mph. At fontana i could only run 7.8@93 half track & 11.9@119 1/4. Oh well, I'll just keep trying
Safety Car
Joined: Sep 2006
Posts: 3,922
Likes: 4
From: Cheektowaga NY
St. Jude Donor '08
No, because there is no way to accurately do it.
Traction (or lack thereof), wind conditions, one's inability to properly adapt to the new/different atmospheric conditions, you can only get a remotely rough estimate.
Oh and btw, this thread will turn into a raging sh|t storm in approximately 10 posts.
Traction (or lack thereof), wind conditions, one's inability to properly adapt to the new/different atmospheric conditions, you can only get a remotely rough estimate.
Oh and btw, this thread will turn into a raging sh|t storm in approximately 10 posts.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
No, because there is no way to accurately do it.
Traction (or lack thereof), wind conditions, one's inability to properly adapt to the new/different atmospheric conditions, you can only get a remotely rough estimate.
Oh and btw, this thread will turn into a raging sh|t storm in approximately 10 posts.
Traction (or lack thereof), wind conditions, one's inability to properly adapt to the new/different atmospheric conditions, you can only get a remotely rough estimate.
Oh and btw, this thread will turn into a raging sh|t storm in approximately 10 posts.
A common approach is to go to a weather web site and look at the weather conditions for a given zip code, and sometimes even at a given time, or "between the time frame of ----- and ----- and attempt to calculate DA.
Surprisingly, some here seem to swear by this method, but hardly anything could be less accurate. The weather station used to record this information could be miles from the track itself.
Unless one is using a well calibrated weather station at the track, there is no way to get an accurate DA reading for any given pass.
Last edited by '06 Quicksilver Z06; Mar 27, 2008 at 11:23 PM.
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Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
I always keep track of all my corrected times. The tendency for my car is I get slightly better corrected times/speeds the higher the DA. However, overall the car is pretty consistent. I use this website:
http://www.modulardepot.com/density.php
http://www.modulardepot.com/density.php
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
I just put in 91F, 25% Humidity, 1077 track elevation, and adjusted the barometric pressure to 28.835 in order to achieve 3600 foot DA. Your times correct to 11.38 at 124.2 mph. Now if you get a 0 foot DA, you probably won't quite run those numbers (from my experience), but you'll only be .1 off and may 1 mph at the most.
But, if you could get the ATCO Winter time mineshaft air of -1000 foot, I'm betting you could run 11.20's at 125 all day long!!!! (especially with the way you drive, you are great!)
But, if you could get the ATCO Winter time mineshaft air of -1000 foot, I'm betting you could run 11.20's at 125 all day long!!!! (especially with the way you drive, you are great!)
Team Owner
Joined: Feb 2001
Posts: 27,252
Likes: 133
From: Short Hills, NJ
Definitely losing some ET/MPH versus say, a 0 foot or even 500 foot elevation but exactly how much is truly impossible to accurately determine.
Race Director
Joined: Nov 2000
Posts: 11,221
Likes: 899
From: CA
2017 C5 of the Year Finalist
St. Jude Donor '08
I just put in 91F, 25% Humidity, 1077 track elevation, and adjusted the barometric pressure to 28.835 in order to achieve 3600 foot DA. Your times correct to 11.38 at 124.2 mph. Now if you get a 0 foot DA, you probably won't quite run those numbers (from my experience), but you'll only be .1 off and may 1 mph at the most.
But, if you could get the ATCO Winter time mineshaft air of -1000 foot, I'm betting you could run 11.20's at 125 all day long!!!! (especially with the way you drive, you are great!)
But, if you could get the ATCO Winter time mineshaft air of -1000 foot, I'm betting you could run 11.20's at 125 all day long!!!! (especially with the way you drive, you are great!)
I was at the same track same day, and ran a best of 11.54 @119.64 MPH!!!
Thanks, and sh/t storm delivered!!!
P.S. you forgot to mention that we were running into a headwind that was up to 35 MPH at times.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Anyway, your 11.54 at 119.64 corrects to:
11.03 at 124.88
I'm guessing you'll run around 11.13 at 124 with a zero DA and you be easily into the 10's at 125 at ATCO on a cold -1000 foot day!
Race Director
Joined: Nov 2000
Posts: 11,221
Likes: 899
From: CA
2017 C5 of the Year Finalist
St. Jude Donor '08
I'm getting senile, I thought you were the one that posted this, that's why I said you were a great driver!
Anyway, your 11.54 at 119.64 corrects to:
11.03 at 124.88
I'm guessing you'll run around 11.13 at 124 with a zero DA and you be easily into the 10's at 125 at ATCO on a cold -1000 foot day!
Anyway, your 11.54 at 119.64 corrects to:
11.03 at 124.88
I'm guessing you'll run around 11.13 at 124 with a zero DA and you be easily into the 10's at 125 at ATCO on a cold -1000 foot day!
Burning Brakes
Joined: Apr 2005
Posts: 1,029
Likes: 0
From: The best one
Its hard to get good times with that kind of DA.
DA conversions are not worthwhile to use for accurate numbers, but ^DA WILL noticably effect your times.
I would guess based off of JBs difference going from sac to fontana: ~.2 and ~2mph Congrats on the 11s.
DA conversions are not worthwhile to use for accurate numbers, but ^DA WILL noticably effect your times.
I would guess based off of JBs difference going from sac to fontana: ~.2 and ~2mph Congrats on the 11s.
Pro
Joined: Jan 2008
Posts: 710
Likes: 2
From: St. Louis Mo
I just went ahead and checked all my guages, and in 1000 ft below air, every car on this thread should go 10'30's .................................
........................................ ........................................ ........................................ ........................................ ..................................:***** :
........................................ ........................................ ........................................ ........................................ ..................................:***** :
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
That's why I said you don't get everything that ModularDepot says you will. My guess is that TM steps in when it's colder. Plus sometimes it's harder to get traction when it's cold (but drag radials that are heated really good helps that).But you are right, lower DA definitely helps. I went from running 12.40's at around 115 with 3000 foot DA's to running a 12.03 at 118.4 with a 255 foot DA!! And I backed it up on the very next run at 12.04 at 118.7.
I agree with that other poster, I'm sure all cars will run 10's in 1000 foot below air; at least the LS3's driven by JSBlown or 11secGP!
Last edited by glennhl; Mar 28, 2008 at 01:48 AM.
Team Owner
Joined: Feb 2001
Posts: 27,252
Likes: 133
From: Short Hills, NJ
I just went ahead and checked all my guages, and in 1000 ft below air, every car on this thread should go 10'30's .................................
........................................ ........................................ ........................................ ........................................ ..................................:***** :
........................................ ........................................ ........................................ ........................................ ..................................:***** :
Cool!
Heel & Toe
Joined: Jul 2004
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From: Lebanon PA