Hey, I found this information today and thought some might find it useful... Rotten The NHRA uses a correction factor to compensate for altitude for stock/super stock classes. Many automotive tests also use this factor when giving 1/4 miles stats testing new vehicles. Just because someone says they have a car that run's low 13's doesn't mean much against yours unless they are on an equal playing field. If you really want an accurate conversion, then do your calculations with density altitude. TO CONVERT YOUR 1/4 MILE E.T. AND MILE PER HOUR TO SEA-LEVEL TIMES, MULTIPLY THE APPLICABLE ALTITUDE FACTOR BY YOUR CURRENT E.T. AND M.P.H. Altitude above Sea Level (in feet) Elapsed Time Factor MPH Factor 1200----------------------------- .9874 ----------- 1.0129 1300----------------------------- .9861 ----------- 1.0143 1400----------------------------- .9848 ----------- 1.0157 1500----------------------------- .9835 ----------- 1.0171 1600----------------------------- .9822 ------------1.0185 1700----------------------------- .9809 ----------- 1.0199 1800----------------------------- .9796 ----------- 1.0213 1900----------------------------- .9783 ----------- 1.0227 2000----------------------------- .9770 ----------- 1.0241 2100----------------------------- .9757 ----------- 1.0255 2200----------------------------- .9744------------1.0269 2300----------------------------- .9731------------1.0283 2400----------------------------- .9718------------1.0297 2500----------------------------- .9705------------1.0311 2600----------------------------- .9692------------1.0325 2700----------------------------- .9679------------1.0339 2800----------------------------- .9666------------1.0353 2900----------------------------- .9653------------1.0367 3000----------------------------- .9640------------1.0381 3100----------------------------- .9627------------1.0395 3200----------------------------- .9614------------1.0409 3300----------------------------- .9601------------1.0423 3400----------------------------- .9588------------1.0437 3500----------------------------- .9575------------1.0451 3600----------------------------- .9562------------1.0465 3700----------------------------- .9549------------1.0479 3800----------------------------- .9536------------1.0493 3900----------------------------- .9523------------1.0507 4000----------------------------- .9510------------1.0521 4100----------------------------- .9497------------1.0535 4200----------------------------- .9484------------1.0549 4300----------------------------- .9471------------1.0563 4400----------------------------- .9458------------1.0577 4500----------------------------- .9445------------1.0591 4600----------------------------- .9432------------1.0605 4700----------------------------- .9419------------1.0619 4800----------------------------- .9406------------1.0633 4900----------------------------- .9393------------1.0647 5000----------------------------- .9380------------1.0661 5100----------------------------- .9367------------1.0675 5200----------------------------- .9354------------1.0689 5300----------------------------- .9341------------1.0703 5400----------------------------- .9328------------1.0717 5500----------------------------- .9315------------1.0731 5600----------------------------- .9302------------1.0745 5700----------------------------- .9289------------1.0759 5800----------------------------- .9276------------1.0773 5900----------------------------- .9263------------1.0787 6000----------------------------- .9250------------1.0801
Hmm, the chart needs to go a little farther down the line for me. Our track DA has been as high as 7800' :argh:
Not a great deal of difference in performance between 1200 feet and sea-level. I guess that is why the N.H.R.A. stopped the chart there. So, if you ran a 12.0 at 1200 feet, you would be very close to an 11.85 at sea-level. (12.0 X .9874=11.85) (Sea-level tracks can also get into a negative d.a. with good air). In my case, a 12.53 at 3000 feet is a 12.07 at sea-level. Another example- Going the other way, a 12.7 at sea-level (divided by the 4000 foot factor of .9510) would be close to a 13.35, at 4000 feet.
7800 feet !! Where do you race, Mt. Everest Raceway? I thought our 6000 foot D.A. was bad!!! You could probably create a factor that was pretty close...
Like an island? (Check your brakes before your run). People that come to Calgary from the low-level (altitude that is) tracks, get VERY frustrated with their vehicles performance here.
I guess that is why they used Nitrous Oxide in WW II for those high-altitude dog fights. Bet they didn't call it NOS back then!!
Heheheheheheheheheh....I think me and Patrick are the closest to the water on this forum....there may be others....:dontknow: I am watching the surf crash right now out my front window....sometimes, I just love Hawaii!
Well, last week it was -16 here with the wind. Today it is 10 because we have a "warm" wind. It is supposed to snow again here in a few days. Hawaii? Oh yeah, I saw a postcard from there once...
What the hell is that obese Casper-The-Ghost thing bouncing around? I've used it once but I wasn't sure what it was for...:argh: :dontknow:
Yes, but we are at 3700 feet and if global warming raises the ocean even a little, well, you can come here for a visit.