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  • 1 Post By Davidl
Discuss Speedo reading at the General Toyota/Subaru Discussion within the Toyota 86, Subaru BRZ, Scion FR-S Forum and Enthusiasts Community; Hi Recently went through a few sections of the Pacific Highway where they had the ...
  1. #1
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    Speedo reading

    Hi

    Recently went through a few sections of the Pacific Highway where they had the "roadworks radar" operating. The first radar said I was doing 70 but the speedo said 84, the second radar said I was doing 68 but the speedo said 82. I upgraded wheels and tyres from 17" X 45 to 18" X 40 just after I bought the car in 2013 but that should only result in a very small variation. Has probably saved my licence a number of times but any ideas why it would be so far out of calibration anyone?
    BRZ likes this.

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    What is the width of the tyre? Presumably a 225 which means OD is only 12mm greater than stock making your speedo almost dead accurate when the tyres are new. As they wear down the OD will decrease & the margin for error will increase closer to stock setup.

    The 2 radars you mentioned - they're crap ! Typically crap ! No doubt those radars have never been calibrated & would probably have come out of calibration with all that vibration & trashing around they have to endure. Your GPS should be dead accurate like those found on dash cams.

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    The car in front that was doing the same speed as me was "clocked" at 82...

 

 

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