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  1. #1
    Monkeytunk's Avatar
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    If you are wondering what kind of air conditions you have...

    Weather

    Find the airport closest to you that has ASOS/AWOS and call the number. A recording will play giving temp, dewpoint (closer dewpoint is to actual, more humid), wind direction/speed along with density altitude (if applicaple, as usually it won't give one if it's less than 1000). DA is what you'll consider mostly, as this is the altitude your engine thinks its running in. For example, I ride at sea lvl, but DA is commonly 1500+ in the summer. Hopefully, it'll give a bit of relief to those who do testing on a regular basis with results that aren't consistent. I think someone else posted on a thread about how to calculate exactly what HP loss you will see at a given altitude/temp.


  2. #2
    Jarrett's Avatar
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    Good stuff, here are a couple of links that are good to use as well:

    http://wahiduddin.net/calc/calc_hp_dp.htm

    http://www.weather.gov/data/obhistory/KJWY.html

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  4. #3
    Lightning Struck's Avatar
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    I ride primarily on the Mississippi, and we have dams every 15-20 miles it seems, and each dam has live conditions on the web. Water temp, height, flood stage, altitude, humidity etc. There are also lots of apps for smart phones to calculate DA.

  5. #4
    Jarrett's Avatar
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    Doing those calculations have saved my sanity many times. Knowing its a 94.8% HP day versus a 103.1% HP day makes a big diff when you see your GPS and RPM results for that day.

  6. #5
    Just relax and enjoy the ride. XLT Chad's Avatar
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    Good Information.

  7. #6
    speedskixp's Avatar
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    There is also an android app called drag times that I use. It calculates the DA and HP correction for your area via gps. Here is a link to their website also where you can look back at a specific date at a local track if there is one nearby to where you ride.
    http://www.dragtimes.com/da-density-...calculator.php

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