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Thread: Any Idea How Much Would It Cost To Have Speedo Calibrated

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    Regular Member Ben H's Avatar
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    Default Any Idea How Much Would It Cost To Have Speedo Calibrated

    Got a buisness venture in mind but would need to know the distance of an exact mile on a mobile basis. At the mo me & a mate are fitting taxi equipment & to calibrate the meters they need to know how many speed pulses the vehicle gives every mile. At the mo we only do this from his house & have worked out our "fixed mile" but if were to do this work on a mobile basis we can hardly drive every car up to 20 miles to our "fixed mile" so having a calibrated speedo we would be able to find a mile anywhere.

    Can't think of any other means of doing this apart from no doubt a mega expnsive GPS device.

    Any ideas?

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    Regular Member AndrewTi's Avatar
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    What about a road angel with it's speed display?

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    Regular Member In a states's Avatar
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    As your tyres wear down the speedo over reads...use GPS to measure a mile....if it's for a Taxi surely they have forums as well with info on this?

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    Regular Member Ben H's Avatar
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    Your typical GPS devices can be out somewhat. Considering these guys are tested & monitored by their councils they have to kind of accurate to prevent over charging fares & also so they don't lose out by underchaging. Apparantly just useing the cars trip oddometer isn't accurate enough.

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    Regular Member Jamie's Avatar
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    you could always use the measured miles that police use to calibrate speedos... its all to do with different coloured dots on road signs, but I can't remember how it works..... MLC is your best bet for this info, as he is an Advanced Driver.

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    Regular Member MLC's Avatar
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    There are specific measured miles that we use for Vascar calibration etc. They are marked with simple white paint. To help us find them in the crud, there are often cones put at the start and finish.

    Doesn't really help you much I'm afraid.

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    Regular Member Swatty's Avatar
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    Just a thought,

    You could fit (to the car you would be travelling to the unknown areas in) something like the equipment at the site attached. Before you travel or at a periodicity you think is realistic (weekly/monthly) you could calibrate the meter on the accurate fixed mile you know locally.

    When you get to the unknown area you could drive the route in your car and identify a measured mile. You can then drive the other car over the same route (if you could find a straight bit of road that would avoid any issues with not following exactly the same route).

    From a quality point of view you would also want to think about getting the meter calibrated by an accredited test centre (probably annually). The guys on the link might be able to help you.

    http://www.donbarrow.co.uk/road_survey_meters.html

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    Regular Member Ben H's Avatar
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    Yeah that equipment there would do the job, they certanly have some bits of kit on that site.
    Nice one.
    Only reason I thought of having a speedo calibrated was from working on police cars that had the sticker on the speedo certfying it had been calibrated.

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    Regular Member Swatty's Avatar
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    Quote Originally Posted by Ben H
    Yeah that equipment there would do the job, they certanly have some bits of kit on that site.
    Nice one.
    Only reason I thought of having a speedo calibrated was from working on police cars that had the sticker on the speedo certfying it had been calibrated.
    I guess you need pretty accurate info

    If you went for the accurate speed option you would need to make sure you maintained the exact speed for a fixed time (i.e. 60 mph for 60 seconds for a mile) if you needed to break or accelerate for any reason the games a bogey.

    I suspect to odometer reading (1/10 of a mile increment) would be too course for what you need to measure (I’m not sure if the calibration cover the speedo and the odometer).

    The good thing about being able to check it yourself is that it will take into account tire tread changes (or even if you buy a posh set of wheels with the profits) .

    Best of luck with the business venture

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