Here are instructions for: "What Would it have run at sea level?"
12-03-2006, 02:29 AM
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Here are instructions for: "What Would it have run at sea level?" I am very happy to be able to provide a step by step. 
I hope it helps! It should help folks who had a time slip in the past and wanted to know what it would have done at sea level / 0 da etc. Here is what I did:
1) Grab your Time & MPH
2) Determine the date you ran and look up the weather for that day at http://www.almanac.com/weatherhistory/locations/
3) Plug in the necessary data at : http://www.modulardepot.com/density.php - you will notice that there isn't a humidity spot at almanac.com so you will need to determine this by going to step #4
4) Head on over to http://www.humirel.com/All_about_hum...lculation2.htm and plug in the temp + dew point from almanac.com
You are done! I hope this helped. I tried it because I found a car I bought ran 12.7 @ 105 at around 1743 da, whereas if it were run here it would have run a 12.5 @ 107.
Enjoy!
I hope it helps! It should help folks who had a time slip in the past and wanted to know what it would have done at sea level / 0 da etc. Here is what I did:1) Grab your Time & MPH
2) Determine the date you ran and look up the weather for that day at http://www.almanac.com/weatherhistory/locations/
3) Plug in the necessary data at : http://www.modulardepot.com/density.php - you will notice that there isn't a humidity spot at almanac.com so you will need to determine this by going to step #4
4) Head on over to http://www.humirel.com/All_about_hum...lculation2.htm and plug in the temp + dew point from almanac.com
You are done! I hope this helped. I tried it because I found a car I bought ran 12.7 @ 105 at around 1743 da, whereas if it were run here it would have run a 12.5 @ 107.
Enjoy!
oh yeah mine ran a 13.87 @ 99.85 w/ a DA of 8420, corrected thats a 12.11 @ 112.5 
damn altitude 
12-03-2006, 02:17 PM
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Remember kids, this is a "WHAT COULD I RUN.." calculation, and not everyone is right.
For example (since I bracket race plenty throughout the year and keep a detailed logbook):
an 11.561 @ 115.10 pass with the following data: 83.7 temp, 53.6 %, 29.93 baro and 2005 corrected DA (with no wind) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.30 @ 117.67.
My worst pass this year was an 11.642 @ 114.70 pass in June with the following data: 99.5 temp, 33.1 %, 29.82 baro and 3029 corrected DA (with a 4-6 mph tailwind!) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.22 @ 118.89.
My best pass this year was an 11.427 @ 115.94 pass in January air with the following data: 63.9 temp, 37.9 %, 29.74 baro and 644.6 corrected DA (with a 4-6 mph tailwind!) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.33 @ 116.89.
So over a tenth of a second variable and 2 mph?? Not accurate! (maybe just me, but too much "off").
Amen here!
Derek
For example (since I bracket race plenty throughout the year and keep a detailed logbook):
an 11.561 @ 115.10 pass with the following data: 83.7 temp, 53.6 %, 29.93 baro and 2005 corrected DA (with no wind) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.30 @ 117.67.
My worst pass this year was an 11.642 @ 114.70 pass in June with the following data: 99.5 temp, 33.1 %, 29.82 baro and 3029 corrected DA (with a 4-6 mph tailwind!) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.22 @ 118.89.
My best pass this year was an 11.427 @ 115.94 pass in January air with the following data: 63.9 temp, 37.9 %, 29.74 baro and 644.6 corrected DA (with a 4-6 mph tailwind!) on my Kestral weather station (track altitude is 127 ft) corrects to an 11.33 @ 116.89.
So over a tenth of a second variable and 2 mph?? Not accurate! (maybe just me, but too much "off").
Originally Posted by FloydSummerOf68
Please don't ever post "corrected" timeslips though...thanks
I've seen people do this and it REALLY gets under my skin. Use it as a way of seeing how your car WOULD stack up against someone who is running at a better track than you are.
I've seen people do this and it REALLY gets under my skin. Use it as a way of seeing how your car WOULD stack up against someone who is running at a better track than you are.
Derek
Last edited by Villain281H; 12-03-2006 at 02:28 PM.
12-03-2006, 04:04 PM
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Originally Posted by 94z28L
k but a 2005 ft DA compared to a 8400+ft DA? there's a slight difference in getting a corrected number from the two of those altitudes
For example: Your 13.87 @ 99.85 w/ a DA of 8420 using the .15 theory is 1.263 dropped, so a 12.607 elapsed time is the result.
Bottom line: all guesstimates.
12-03-2006, 04:58 PM
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Yes, only estimates ... though quite good ones Better than nothing, that is for sure. The only REAL way to have a carbon copy of your car run somewhere else, which of course couldn't really happen either.
Better than nothing, that is for sure. The only REAL way to have a carbon copy of your car run somewhere else, which of course couldn't really happen either. 
