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Thread: Snowflakes have lost me MPH

  1. #1
    Regular Member Mopar Man's Avatar
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    Default Snowflakes have lost me MPH

    Since going from 17" to 19" snowflakes, i have noticed my speedo has dropped about 5 to 10 MPH doing high speeds. Is there different speedo gearing and is it easy to do. Thanks Alan

  2. #2
    Regular Member MattVecVXR's Avatar
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    Vehicle : Vectra

    Trim : VXR

    Engine : 2.8 V6 Turbo (280)


    Mileage : 82000

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    As long as the outside diameter of the tyres/wheels are the same it should be unaffected. I've put 19s on from 17s before and it remained the same because the 19s had lower profile tyres on.

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    Full Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

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    The tyre size can be changed in the ECU using pc software or tech2.
    What I did with mine was stick the cruise control on 70mph and check the reading given by Tomtom/satnav then adjusted the tyres in the ECU until I got the correct reading on the speedo, you can also specifiy your own diameter.
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

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