Calibrate speedometer (Testarossa) | FerrariChat

Calibrate speedometer (Testarossa)

Discussion in 'Boxers/TR/M' started by Threeofnine, Sep 23, 2023.

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  1. Threeofnine

    Threeofnine Formula Junior

    Joined:
    Dec 11, 2020
    Messages:
    393
    Location:
    Birmingham, AL USA
    Full Name:
    Jarrod Heath
    At higher speeds, typically above 60 mph, the GPS speed on my phone and radar detector reads around 5-10 mph higher than my speedometer. My Testarossa has bigger wheels, but shorter tires(rear 295/35 zr 18. Front 235/40 zr18), to accommodate brembo brakes. I assume that’s likely the reason.

    How would I go about calibrating it? Could a dealer or independent service center help?
     
    Threeofnine, Sep 23, 2023
    #1

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