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Hello guys got a issue here my whole cluster has packed up on my Mercedes r129, I tried the basics but nothing seems to be working and a new cluster from Mercedes is £1500 so waiting for one to pop up in fleabay, so what is the best device to use for calculating my speed, I'm worried about passing speed cameras, I do own a Garmin sat nav so wondering weather this will be perfect for the job or are they not always accurate, all help is appreciated thanks
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A satnav will be fine, and probably more accurate than any speedo.
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In do remember going past a speed sign, the ones that give you a smile or sad face, and it matched pretty much with my sat nav, I take it the speed signs and cameras take the speed reading via GPS like a sat nav
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In do remember going past a speed sign, the ones that give you a smile or sad face, and it matched pretty much with my sat nav, I take it the speed signs and cameras take the speed reading via GPS like a sat nav Hi, No they use the Doppler effect the same as police hand held and static speed cameras. Colin |
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Laters
Club Retro Rides Member
Head Droid Builder and Bottle Washer
Posts: 123 
Club RR Member Number: 115
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Speedo issues Laters
@laters
Club Retro Rides Member 115
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I have used a sat nav as a speedo for a while when my c class had the sticky speedo needle issue.
I have also tried the gps phone apps & the ones I have used (android) have worked quite well once the phone has a good gps lock.
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Club Retro Rides Gti Member
Garage Queen, 1987 Quantum Saloon
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What is the Doppler effect Colin ? I downloaded wase as well on my phone so can use that as well, lol also will have to keep the fuel tank topped up as the whole cluster has stopped so no oil pressure, fuel, rev, mpg, Speedo, just hope one pops up soon but for the time being it will have to do £1500 seems like day light robbery
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Hi, The speed camera emits regular timed pulses of radio waves at the vehicle and then measures the interval of the reflected pulses and calculates the speed it is moving towards the original source. A more common illustration of it is the way the noise of a car changes as it's coming towards you, passing and then going away again, it's not just louder but the tone changes as well.
Colin
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Thanks Colin, that explains it,
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