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Thread: Another tire size change question. Sorry

  1. #1
    Tuner in Training
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    Jul 2013
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    Another tire size change question. Sorry

    I have a 99 escalade that im trying to change tire size on. I have the "Error" in the current tire size value, so it wont allow me to enter the new tire size in. I tried using the spreadsheet in the sticky but I wasn't able to make sense of it. Im going from 265/70/16 to 265/75/16 or basically 30.6" to 31.6" If someone could help me manually scale this I would be very thankful.
    99escalade5.7vortecshiftfirm.hpt

  2. #2
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    Regina, Sask.
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    Make the changes as shown.

    Russ Kemp
    Attached Images Attached Images

  3. #3
    Tuner in Training
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    Thank you very much. I actually came up with 95224 for VVS pulses per mile and 2381 for Trans Rev/Mile based on a 31.6 tall tire. I guess what was confusing me was why would the factory VVS pulses per rev-trans be set at "1" instead of the normal "40"??

  4. #4
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    Don't enter the actual tire dia, as that doesn't account for the loaded tire radius and will cause the speedo to read high. Use my values, and check with a gps.

    Not sure why Hp Tuners set it the way they did, as it in Tuner Cat, the pulses per rev is 40.

    Russ Kemp

  5. #5
    Tuner in Training
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    ok thank you

  6. #6
    Tuner in Training
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    Mar 2014
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    ok how do i figure out a 255/40/18 on my 07 impala ss