How Much Faster At A Sea-Level Track?

Discussion in 'Ram Srt-10 Racing' started by rottenronnie, Nov 24, 2008.

  1. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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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: Nov 24, 2008
  2. moparracing

    moparracing Full Access Member

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    this only goes down to 1200 feet ??:dontknow:
     
  3. tsmith3

    tsmith3 New Member Supporting Member

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    Hmm, the chart needs to go a little farther down the line for me. Our track DA has been as high as 7800' :argh:
     
  4. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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: Nov 24, 2008
  5. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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: Nov 24, 2008
  6. Annu Kumar

    Annu Kumar Full Access Member

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    They should make a track right next to the Ocean:D :D
     
  7. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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    My other ride kicks ass at 22,000 feet!:D
     
  8. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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.
     
    Last edited: Nov 24, 2008
  9. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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!!
     
  10. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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    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
     
  11. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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    That was for the pilots!:p

    I use jet fuel!;) :marchmellow:
     
  12. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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: Nov 24, 2008
  13. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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
     
  14. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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    That sucks......


















    .....TO BE YOU!!!!!!!!!MUUUUWHAAAAAWHAAAAAAA!!!!:D :marchmellow: :marchmellow:
     
  15. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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    It's modeled after Mikey....:dontknow: ;) :D
     
  16. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    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
     
  17. KRAZYSRT10

    KRAZYSRT10 Full Access Member

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

    moparracing Full Access Member

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    pir is @ 29 feet..... :)
     
  19. moparracing

    moparracing Full Access Member

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    that extra 100 hp obviously is an advantage. ;)
     
  20. rottenronnie

    rottenronnie Well-Known Member Supporting Member

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    Not sure I would gain 100 h.p. but 5 - 6 10ths (or more) is pretty common dropping 3000 feet.