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Thread: HOWTO: Ford Speedo Correction

  1. 03-23-2021 #41
    JANNETTYRACING
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    2017 mustang gt going from 3.31 to 4.10 will this change correct the speedo?
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  2. 03-23-2021 #42
    Ranger Coyote
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    Quote Originally Posted by JANNETTYRACING View Post
    2017 mustang gt going from 3.31 to 4.10 will this change correct the speedo?
    Your Output Shaft Speed will be about 23.8670694864048 percent different, so you will need to go into all your tables and limiters that operate based off OSS and multiply by 1.238670694864048. My math might be wrong, but you get my point.
    Last edited by Ranger Coyote; 03-23-2021 at 06:42 PM.
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  3. 03-24-2021 #43
    JANNETTYRACING
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    Quote Originally Posted by Ranger Coyote View Post
    Your Output Shaft Speed will be about 23.8670694864048 percent different, so you will need to go into all your tables and limiters that operate based off OSS and multiply by 1.238670694864048. My math might be wrong, but you get my point.
    Thank you I have applied the multiplier to the tables shown it is a manual car.

    Reading this thread it is unclear on the 2017 Mustang whether the speedo cal is done in the Calibration or with the Scanner Vehicle controls.
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