GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: Milby on 31 March 2012, 20:39
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i noticed the other day on a nice drive down south my speedo was reading about 80mph and the sat nav was reading about 70mph is there any way to get the speedo calibrated ??
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What size wheels/tyres are you running? Incorrect tyre size can cause the speedo to read wrong
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This^^^
Plus the fact your car speedo should read approx 3-5mph above your actual speed which is more likely to be recorded on your sat nav.
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185/55/r14
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185/55/r14
When I had my Mk3, it had 205/50/15s on and the speedo was pretty much bang on.
The difference between 205/50/15 & 185/55/14 is -4.45%
That amount accounts for just over 3mph when doing 70, combined with the speedo over-read you get as standard is about right. If you want to get it to read more accurately then you need larger tyres.
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i'd say its probly the sat nav, lets face it there not that accurate are they
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As said above its the tyres throwing out the speedo, the sat nav speed is done on gps, although as much as a second time delay it's the most accurate of the two
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yeah they are ment to be dead on but its probly just the one i used :laugh: i have had experience with a dodgy one
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The police use evidence based on speedo speed not gps ..nuff said..
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And coincidentally their sophisticated radar equipment isn't based around 15 year old analogue VAG clockwork.