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  • 1/4 mile times

    Ok, i decided to test out some equations found online, and some i learned in physics to see if i could get a rough estimate on the horse power of my car. I used DYKZ34 1/4mile times and dyno hp as a base to run through the equations and see how accurate they were. They come within 1-1.5% accuracy unless i did something wrong.

    I have heard to estimate a loss of 20% flywheel horsepower over the drivetrain.

    I used 3200lbs and wheel hp of 179 and came up with 15.23 in the 1/4 in the equations for dykz's car. His time on the timeslip was 15.38 so that gives it about a .5% accuracy.

    I raced a 2000+ GP GT with some exhaust work and possibly other mods last summer and beat it, his bumper was at my door from 0-90 the entire race. I estimated he should run about a 15.5......is this reasonable or no? The came to about 179hp at the wheels.

    Off that estimate i estimated my time to be a 15.3, in which case this gives me, with the wieght of my car puts 213hp at the wheels. Which is ALOT more than DYKZ's car.

    Was I too generous on the times given to the GP and my car? I think i was because I dunno why my car would have that kind of power at the wheels with these mods:

    FFP Pulley and dog bone
    Exhaust 2.5" Cat back Magnaflow
    Gasket matched intakes
    K&N with holes in box
    Bosch Platinum Plugs

    Using my 1/8 mile times and driving with a blown head gasket i was able to calculate 177 wheel hp.

    Anyone care to check my work and please prove me wrong?


    www.cardomain.com/id/topless94style

  • #2
    RE: 1/4 mile times

    I suppose I should show the other numbers I used:

    My weight 3800lbs
    1/8 mile time: 10.6
    1/4 mile conversion: 16.4
    GP GT guesstimate hp @flywheel: 224
    GP GT guessed weight: 3400
    GP GT @wheels: 179
    Equations used:
    For 1/4 time(my numbers should be corrected, this is for a good 60' of 2.2 or less, mine was about 2.4-2.5):
    5.825* cubed root of weight of car divided by hp(wheel hp)

    For HP:
    Weight*(MPH/234)cubed
    I converted my 68mph 1/8mile trap to 84.3 1/4

    Estimated power:
    P= (.5*mass in kg*velocity in m/s squared)/time
    P = watts
    1 hp = 746 watts
    P/746
    then for some reason i multiplied by 1.8 and got pretty close on the wheel hp...within 1.3%


    www.cardomain.com/id/topless94style

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    • #3
      Man! That is a lot of cypherin'! You crushed a bunch of numbers! My last run was 15.94 @ 89.4 MPH. Pretty much stock. What you have to realize is, advertised HP, is for sales purposes, done on a static engine dyno. We don't have 210 HP on the track. Bottom line is,... Averages: 5040 RPM,.. Wheel HP,..130.6, Wheel Torque...136.6 Ft. Lbs., Correction factor,...1.023, Speed,...95MPH. Now the MAX: 5928 RPM,... Wheel HP,..154.6, Wheel Torque,...174.0 Ft. Lbs., Correction Factor,...1.023, Speed,...120.1 MPH. CF is calculated at optimal weather conditions. 70* at sea level. There is another "Dyno" out there, that will give you better numbers, but, let's just say they are fudging a bit. 94 Cutlass, 3.4 DOHC, 4T60-E, Hi-Flo cat, Borla Cat Back. (CAI isn't a factor in a static test) These numbers suck in a way, but, the DOHC still is a Bitch of a 6 Banger!)
      If you are driving a Chevy, everything else, is just a blur. 3.4 Carbon Footprint.
      sigpic

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      • #4
        BTW, I like your car.
        If you are driving a Chevy, everything else, is just a blur. 3.4 Carbon Footprint.
        sigpic

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        • #5
          do I hear bells??
          I wish 10% of the people on the road knew how to drive

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          • #6
            Uh...Nope..Exhaust.
            If you are driving a Chevy, everything else, is just a blur. 3.4 Carbon Footprint.
            sigpic

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            • #7
              Ha ya 3hrs between classes and not wanting to study will lead to thinking...especially after physics.
              I understand that hp numbers can be used as advertising techniques, but where are you getting those numbers from?

              Thanks for the comment about the car by the way.


              www.cardomain.com/id/topless94style

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              • #8
                my 96 ran a 16.5 1/4 with intake & Exhaust
                Donesic Disurbance
                Grand Am 3400

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                • #9
                  I had my car dynoed Saturday. That's where the numbers came from.
                  If you are driving a Chevy, everything else, is just a blur. 3.4 Carbon Footprint.
                  sigpic

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