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HP ratings based on MPH in 1/4 Mile

Discussion in 'Street/strip 400/430/455' started by Smartin, Aug 9, 2003.

  1. Smartin

    Smartin Guest

    Is there a "formula" that you can use to determine this?

    I hear that you can tell a ballpark HP by looking at the MPH in your quarter mile.
     
    Smartin, Aug 9, 2003
    #1
  2. Smartin

    Smartin Guest

    Thanks!

    It seemed to lowball everything I put into it. Didn't seem too accurate. But I'll keep shoveling money into the car!:grin:
     
    Smartin, Aug 9, 2003
    #2
  3. cray1801

    cray1801 Too much is just right.

    Adam, use HP at flywheel vs rear wheels and you should be close.
     
    cray1801, Aug 9, 2003
    #3
  4. Smartin

    Smartin Guest

    I'm unsure of either of those ratings...

    It told me that my 5000lb car at 89 mph has 270 HP...

    Is this Flywheel or Rear wheel?
     
    Smartin, Aug 9, 2003
    #4
  5. cray1801

    cray1801 Too much is just right.

    Flywheel I think (it does not say), which should be somewhere around 210-215 HP at the wheels. I also think thesw calculations are low...

    I plugged Phil's #'s in, he said he had 375 at the wheels and ran 11.99 at 111 and change. I went to the "calculate HP from ET and weight"(this one says at the wheels), this resulted in 469, this is high as Phil said he had 375 the wheels. 375 HP times 1.25 to get flywheel = 469.

    There are a lot of "calculators" out there, they are not created equal.
     
    cray1801, Aug 9, 2003
    #5
  6. opeltwinturbo

    opeltwinturbo Well-Known Member

    Adam: I plugged in #'s using ET/Weight (1109)then MPH/Weight (1209). The answers were 100 HP different. I used a different calculator and came up with 1219. They are close enough for government work. Best deal is the dyno. Take a lazy drive down to Humble, Texas. Visit Lawrence Conley's new dyno. He'd enjoy some Buick visitors. Good luck.
     
    opeltwinturbo, Aug 9, 2003
    #6

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