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Thread: Calculating horse power

  1. #1
    FLAC djmickyg's Avatar
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    Calculating horse power

    i had a thought last night..
    calculating horse power with gps...

    i know im going to get flamed for this, so go on an get it all out of youeself if u feel the need to

    and i know it will be pretty unacurate...

    but here goes...

    i did a bit of a search to refresh my menmory on calculating horse power
    this is what i came up with

    http://wiki.ehow.com/Calculate-Your-...nd-Horse-Power
    http://www.glenbrook.k12.il.us/gbssc...rgy/u5l1e.html

    so going with the first site..

    Calculate the Power (P) with the formula: (m*9,82*h)/t, where m=mass (your weight) in kilograms, h=height of staircase in metres and t=time in seconds. The number you get is in Watts wich is equal to Joule per second (J/s) and Newton metres per second (Nm/s).

    Divide the number of Watts by 736 to get the number in horsepower.
    we know the nmea refreshes every 1 sec.. so t = 1

    mass would have to be entered in some ini file somewhere. this is one of the measurment that could make it in acurate

    height would be the current altitude measurment - the altitude fromt he previous second. giving the rise over that one second

    well this is just a start.

    comments?

  2. #2
    Constant Bitrate weekendowel's Avatar
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    With your calculation the car wouldn't develop any horsepowers going on a flat road, right?

    Quote Originally Posted by djmickyg
    i had a thought last night..
    calculating horse power with gps...

    i know im going to get flamed for this, so go on an get it all out of youeself if u feel the need to

    and i know it will be pretty unacurate...

    but here goes...

    i did a bit of a search to refresh my menmory on calculating horse power
    this is what i came up with

    http://wiki.ehow.com/Calculate-Your-...nd-Horse-Power
    http://www.glenbrook.k12.il.us/gbssc...rgy/u5l1e.html

    so going with the first site..



    we know the nmea refreshes every 1 sec.. so t = 1

    mass would have to be entered in some ini file somewhere. this is one of the measurment that could make it in acurate

    height would be the current altitude measurment - the altitude fromt he previous second. giving the rise over that one second

    well this is just a start.

    comments?

  3. #3
    Admin. Linux loser.
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    Bugbyte's Avatar
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    Good one.

    Also, from that first web site:

    "Don't take the numbers too seriously; they can be inaccurate under certain circumstances. For example, air friction is not part of the calculation and lower numbers can occur if the stairs is not very steep (side movement does not count). So they should not be considered as numbers that say how strong you are, just how efficient you are in that particular stair."

    Wind resistance, or drag, matters when talking about an automobile.

    Here's a different way to accomplish what you are asking for: Using OBDII as a dyno.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  4. #4
    Constant Bitrate
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    you would'nt use altitude, thats just for the example, you'd use distance of course.

    and it would only show teh current amount of BHP you car is producing at that moment in time.

    It would be 10x better off your speedo.

  5. #5
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    Another good way to calculate HP is to rig a bicycle to a small generator or alternator and measure the voltage drop and currect across a load. Now granted, what you are measuring is "useful" HP, which doesn't take into account losses due to heat and friction, but the system could be calibrated without too much difficulty.

    -g.

  6. #6
    Constant Bitrate
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    Surely your indicated HP would massively increase if you were going down hill?

    You can buy devices that you stick on your dash and after putting in your cars weight will give you an approximate HP. Think they work off the effects of acceleration though rather than GPS

  7. #7
    FLAC djmickyg's Avatar
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    fair points everyone.. i knew it wouldnt be the most accurate way of doing it..
    but i was just throwng a thought out..

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