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    Fast and loosely speaking

    Asked by Barry Warrillow

    COULD you please tell me the Australian Standard for speedo accuracy? I have a 2004 Hyundai Elantra Elite with what seems to be an excessive speedo error. On a dyno test, the dyno read 110km/h, the speedo 123km/h; when the dyno read 100 km/h the vehicle speedo read 112km/h; when the dyno read 80km/h, the vehicle speedo read 90km/h. The selling agent tells me the error is not too bad. If I know the Australian standard I may be able to progress with my problem.

    Answered by CarsGuide

    23 Sep 2004 Carsguide.com.au

    THE Australian Design Rule calls for a speedo to be accurate to plus or minus 10 per cent, so at 100km/h your speedo could be showing anything from 90km/h to 110km/h. If it is showing 112km/h when you're actually doing 100km/h, it doesn't comply with the standard. The problem I have with your dyno test is that you don't know the accuracy of the dyno. It is also a machine with tolerances and you need to know what they are to determine the results' accuracy. Remember the speedo is built with tolerances so is unlikely ever to be 100 per cent accurate. Many other factors affect the accuracy of the speedo reading: the rolling diameter of your tyres, wear on tyres, inflation pressure and so on. The RACV regularly checks speedos for accuracy and results show speedos of modern cars are much more accurate than those on older cars. Most speedos checked fall on the conservative side -- that is, the indicated speed is higher than the actual speed.

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