I wanted to know what difference does elevation makes on a 1/4 mile E.T. time and does it effect the trap speeds? I know that the higher the elevation the slower the e.t. but is there a converter or correction that my be used to get a "corrected time"? I just wanted to know what to look for when going to the track at 1000feet above sea.
Thanks!

 

Check out this article. This is how the NHRA calculates Et and mph for different evevations.

http://www.carcraft.com/techarticles...ing/index.html


I dont know if there is an exact formula for elevation vs 1/4mile times b/c your times will also be effected by air temp and humidity. Which is usually changing all the time from track to track. 1000 ft isnt to bad Im in Calgary our track is 3280ft above and most pple claim 3/4-1 second from sea level times.

 

I cant get to me usual correction site (its down) but correcton factor should be just over 0.99 for ET.

In otherwords times should be off just under 0.135 for1000' ASL for a 13.5 car.

Of course this time a year you can easily see Density Altitude of over 4000' if you run in the daytime and this could have huge consequences with the car off as much as 7/10 of a second.

 

Here is the site that Gene had sent me awhile ago to correct your times. You will need track alt, temp, % humidity, pressure, and of course ET and Trap speed. You will get DA and corrected numbers.

http://www.modulardepot.com/density.php

 

it makes a huge difference, come up here to the mountains and watch everyones cars suck[8D]

Of course you get used to it after a while, eventually you kind of know what most cars will run up here

 

Drhoward what mods do u have and what do u run at race city?

 

thanks a lot according to the websites calculations if i were racing right now there would be a DA of 2564 and my 1/4 times would be off by .4 seconds and 3mph. not much but I just wanted to be able to tell if i am doing good or bad.

 

4000? you lucky bastard lol.

if i raced right now (7pm) itd be 5268DA and it wasnt even that warm today (only 109)

 

Currently my biggest mod is a missing engine[8D]


But I have a HCI swap, full bolt ons and a 125 shot of nitrous, my best time at race city was 14.4 at 98 (the only time I ran it with my HCI, untuned, off the bottle and with what turned out to be a blown head gasket-only got one run in that night[:@])

I am hoping to get into the 13's when I get my new engine swapped in, and hopefully high 12's on the bottle......hopefully

 

http://www.greatlakesdragaway.com/co...onfactors.html

This is where I go....