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Speedo CalibrationViews : 2500 Replies : 36Users Viewing This Thread : |
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Jul 17th, 2020, 16:09 | #31 | |
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Jul 17th, 2020, 18:42 | #32 |
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I can't understand how though, GPS speed is based on 2 points height means nothing in this case, of course, it can't measure a sheer drop off a cliff much then same way it cannot accurately measure the height of say a drone (I have one) well, it can but it's way out, but that's getting off track, GPS measuring speed horizontally be it on any incline a vehicle can travel is accurate as far as non "real time kinetics" aka rtk GPS as seen in farming etc, contouring is certainly not needed for the general public and any how, the speed is based on GPS plotting, and nothing to do with the map itself, plus, it would need some more serious computing power to, to compute the speed from the contour plots based on GPS speed.
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
Jul 17th, 2020, 20:38 | #33 |
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To return to actual calibration.
Not a Volvo question but throwing this out to the amassed knowledge of this forum.
My son has recently acquired a Vauxhall Insignia VX-Line fitted with 19” wheels and 235/35 VR 19 tyres which will soon require replacement. We wish to fit a higher profile tyre, possibly 235/55. We do not yet know whether the increased size will foul on anything, but, my research indicates that the increased rolling circumference of the 235/55 will seriously affect the speedo. reading causing to read about 15% slow, which is obviously illegal. Does anyone know whether it is possible to have a speedo. recalibrated to take account of the different tyre size?
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Jul 17th, 2020, 20:46 | #34 |
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All things are possible, try talking to Instrument Repair of NottIngham.
They used to calibrate the speedos on police cars and as well as taking the speedo out they also needed to know the size and make of the cars tyres to make the calibration as accurate as possible.
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Jul 17th, 2020, 21:05 | #35 | |
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David V70 2.5 10v Torslanda Manual 98 Sreg |
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Jul 17th, 2020, 22:18 | #36 | |
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an example; a 45 degree slop 44 miles along the flat road at the bottom and if you go up the slope its about 54 miles to cover the same 44 miles in the straight line at the bottom ok a 45 degree slope is a bit exaggerated but hopefully you understand now . It is similar with curves and bends GPS will calculate it as a series of straight lines . Its easier to see with a tape measure :-)
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Jul 18th, 2020, 04:25 | #37 | |
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Now, if we are talking about newer GPS units built within the last 3 decades will have GPS (Navstar) and GLONASS, the latter being much more accurate, down to around 6ft, these are going to be even more accurate than the GPS counterpart at 5m or if fitted with L5 band (RTK) 30cm but then also they would be fitted with the new Galileo receivers wth accuracy at about 1m down to 1cm encrypted (RTK). When I 1st used GPS it was on my XDA that needed a BT GPS unit, I used a small tomtom BT device, that used to connect to about 8 sats using the Navistar GPS system, my Phantom 4 Pro drone uses Navstar and GLONASS and connects to about 18 sats with a clear sky, ie no trees or buildings partially blocking the view. With the newer DJI drones able to connect to Navstar, GLONASS and Galileo, the number of sat connections with be many more and the accuracy will be 2nd to none thus, whether you're on a hill or not. As for the series of straight lines, maybe of concern back when it was Navstar, certainly not any more with the precision of Glonass and now Galileo.
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Regards, Bashy MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors |
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