How Much Faster At A Sea-Level Track?

rottenronnie

rottenronnie

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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
 
Last edited:
moparracing said:
this only goes down to 1200 feet ??:dontknow:
Click to expand...


Hmm, the chart needs to go a little farther down the line for me. Our track DA has been as high as 7800' :argh:
 
moparracing said:
this only goes down to 1200 feet ??:dontknow:
Click to expand...

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.
 
Last edited:
tsmith3 said:
Hmm, the chart needs to go a little farther down the line for me. Our track DA has been as high as 7800' :argh:
Click to expand...

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...
 
Last edited:
Annu Kumar said:
They should make a track right next to the Ocean:D :D
Click to expand...


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.
 
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KRAZYSRT10 said:
My other ride kicks ass at 22,000 feet!:D
Click to expand...

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!!
 
rottenronnie said:
Like an island?
(Check your brakes).
Click to expand...

Heheheheheheheheheh....I think me and Patrick are the closest to the water on this forum....there may be others....:dontknow: ;) :D

I am watching the surf crash right now out my front window....sometimes, I just love Hawaii!:p
 
rottenronnie said:
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!!
Click to expand...

That was for the pilots!:p

I use jet fuel!;) :marchmellow:
 
KRAZYSRT10 said:
Heheheheheheheheheh....I think me and Patrick are the closest to the water on this forum....there may be others....:dontknow: ;) :D

I am watching the surf crash right now out my front window....sometimes, I just love Hawaii!:p
Click to expand...

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... ;)
 
Last edited:
KRAZYSRT10 said:
That was for the pilots!:p

I use jet fuel!;) :marchmellow:
Click to expand...


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: :D
 
rottenronnie said:
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.
Click to expand...

That sucks......


















.....TO BE YOU!!!!!!!!!MUUUUWHAAAAAWHAAAAAAA!!!!:D :marchmellow: :marchmellow:
 
rottenronnie said:
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: :D
Click to expand...

It's modeled after Mikey....:dontknow: ;) :D
 
KRAZYSRT10 said:
That sucks......


















.....TO BE YOU!!!!!!!!!MUUUUWHAAAAAWHAAAAAAA!!!!:D :marchmellow: :marchmellow:
Click to expand...

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. :p
 
rottenronnie said:
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. :p
Click to expand...


Naaaahhhh...the Navy can pay for me to move.;)
 
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