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Calculating Horsepower

Discussion in 'HA/GR' started by 348chevy, Aug 3, 2008.

  1. 348chevy
    Joined: Apr 2, 2007
    Posts: 431

    348chevy
    Member

    I used to have a site on my computor that would let you calculate horsepower by the weight and speed at the end of the quarter mile. If you know the weight of the car plus you and the speed of the car at the end of the quarter mile it will tell you what your HP is. I remember using it with my 58 and it was pretty accurate. Does any one know the formula or a site that gives that info? This would be a good thing for those who don't have a dyno and would open some eyes on what a penalty weight is.:)Roy
     
  2. CrkInsp
    Joined: Jul 17, 2006
    Posts: 513

    CrkInsp
    Member
    from B.A. OK

    Last edited: Aug 3, 2008
  3. 348chevy
    Joined: Apr 2, 2007
    Posts: 431

    348chevy
    Member

    Well I ran the numbers on my car and it says I was making 205 HP to achieve 113.58. Not much by todays standards but it certainly shows that a little HP equates into a bunch of fun.:DRoy
     
  4. ThingyM
    Joined: Sep 4, 2006
    Posts: 812

    ThingyM
    Member

    Hey that is pretty cool.. According to that. I aught to be able to beat that little Ol' Lady in the wheelchair...Watch out Tom.. I'll be after ya.....he he he...
     
  5. 64 DODGE 440
    Joined: Sep 2, 2006
    Posts: 4,434

    64 DODGE 440
    ALLIANCE MEMBER
    from so cal

    Sounds good. Pounds per horsepower is the name of the game.......

    I may not have the horsepower, but I have the hole saws and I know how to use them.:D
     
  6. Moroso sold a slide rule for that years ago. probably still does. I have two here for some reason. Comp cams had a program on thier large floppy disc deal but i dont know about now. I use Mr Gaskets Desk top dyno and the mating drag program. Usually can come within 2 /10ths on paper to track. A couple of times right on. You have to be honest though. If you lie to it it will lie back to you. Doesnt do the same as the others (weight , 1/4 speeed + HP)but it is a very useful tool.
    Don
     
  7. iagsxr
    Joined: Aug 26, 2008
    Posts: 298

    iagsxr
    Member

    Try these;

    HP= weight/(et/5.825)cubed

    HP= (mph/234)cubed x weight

    don't know how to type the little upper case 3(cubed)

    I'm curious how close these equations come out to what you're using. The mph equation, I think, will give a more accurate hp number as the et equation ***umes optimal gear ratio and traction.
     

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