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  1. #1

    Default Drag Racing Gear Formulas

    Formula for max mph with gears:

    (tire height x rpm's) / (gear ratio x 335)

    Formula to tell if you have the right ratio for the 1/4:

    ET x MPH = 1335, if higher than 1335 you need more gear, if lower you need less.

  2. #2
    boosted hp's Avatar
    Join Date
    Oct 2004


    That doesnt seem right......I have 4.56s and its say I need more?
    battery relocation kit?

  3. #3


    It's a pretty "general" formula. It doesn't take certain things into account, and I'm sure is geared towards cars running slicks.

  4. #4
    Banned Brandon's Avatar
    Join Date
    Jul 2004


    Mine came out to 1337.8

  5. #5


    That's pretty much dead on.

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