Elevation and timeslips?
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 50
Likes: 0
From: Mira Loma, CA
Elevation and timeslips? Is there a certain formula to use to figure out the exact advantages of two different tracks in regards to elevation only.
If the elevation of one track is 300 feet above sea level and another is 1100 feet, what kind of advantage does the 300 have over the 1100 in like conditions?
Is there a certain formula you can use to determine this.
TIA
Chris <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
If the elevation of one track is 300 feet above sea level and another is 1100 feet, what kind of advantage does the 300 have over the 1100 in like conditions?
Is there a certain formula you can use to determine this.
TIA
Chris <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
Re: Elevation and timeslips? Density altitude is MUCH more important than true elevation. Take where I live for example.
I'm at 3700 ft. On a good day, we'll have a 2500 ft DA. On a bad day, we'll have a 7000 ft DA. DA is calculated based on temperature, humidity, and the most important aspect, barometric pressure.
On a 5200 ft DA day, I ran 14.3 at 100 in my bone stock 98Z. Using the rough 700 ft = 1 tenth, that's about 7.5 tenths - which equals 13.5-13.6. Probably close. The calculator at http://www.gafba.com will provide you with DA calculations as well as quarter mile correction, but I don't buy it most of the time. <img src="gr_images/icons/wink.gif" border="0">
Bottom line, my opinion is: don't bother correcting for altitude. Compare yourself with the local guys, or you'll go nuts trying to tie someone's time from Houston Raceway Park in January with a high pressure system going through. <img src="gr_images/icons/wink.gif" border="0"> They get negative DA's down there, and the calculators just don't work that way.
Comparing myself to the local guys, LT1 cars run high 14's / low 15's, my stock LS1 ran 14.3-14.4, bolt on LS1 runs 13.9-14.0. That's the only comparison I care about or can make - with the locals.
JM$.02,
Andrew
I'm at 3700 ft. On a good day, we'll have a 2500 ft DA. On a bad day, we'll have a 7000 ft DA. DA is calculated based on temperature, humidity, and the most important aspect, barometric pressure.
On a 5200 ft DA day, I ran 14.3 at 100 in my bone stock 98Z. Using the rough 700 ft = 1 tenth, that's about 7.5 tenths - which equals 13.5-13.6. Probably close. The calculator at http://www.gafba.com will provide you with DA calculations as well as quarter mile correction, but I don't buy it most of the time. <img src="gr_images/icons/wink.gif" border="0">
Bottom line, my opinion is: don't bother correcting for altitude. Compare yourself with the local guys, or you'll go nuts trying to tie someone's time from Houston Raceway Park in January with a high pressure system going through. <img src="gr_images/icons/wink.gif" border="0"> They get negative DA's down there, and the calculators just don't work that way.
Comparing myself to the local guys, LT1 cars run high 14's / low 15's, my stock LS1 ran 14.3-14.4, bolt on LS1 runs 13.9-14.0. That's the only comparison I care about or can make - with the locals.
JM$.02,
Andrew
TECH Fanatic
Joined: Nov 2001
Posts: 1,324
Likes: 0
From: Corona CA
Re: Elevation and timeslips? You talkin' Carlsbad vs. Fontana?
I ran Fontana = 12.75@109 then Carlsbad 12.62@110 the same day, same 60'. So about .15, being how I ran Carlsbad in the hot afternoon and Fontana in the AM.
I ran Fontana = 12.75@109 then Carlsbad 12.62@110 the same day, same 60'. So about .15, being how I ran Carlsbad in the hot afternoon and Fontana in the AM.
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 50
Likes: 0
From: Mira Loma, CA
Re: Elevation and timeslips? [quote]Originally posted by McRat:
<strong>You talkin' Carlsbad vs. Fontana?
I ran Fontana = 12.75@109 then Carlsbad 12.62@110 the same day, same 60'. So about .15, being how I ran Carlsbad in the hot afternoon and Fontana in the AM.</strong><hr></blockquote>
Yep. That's what I'm talking about <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />
<strong>You talkin' Carlsbad vs. Fontana?
I ran Fontana = 12.75@109 then Carlsbad 12.62@110 the same day, same 60'. So about .15, being how I ran Carlsbad in the hot afternoon and Fontana in the AM.</strong><hr></blockquote>
Yep. That's what I'm talking about <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />
Re: Elevation and timeslips? The faster you are the less difference it makes. At my level I run 11.94 at LACR (2700'), and 11.76 at Carlsbad. I figure I'll just get my LACR times down to 11.76 and I'll be in the 11.50s at Carlsbad. <img src="gr_images/icons/wink.gif" border="0">
