Odometer inaccuracy

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Originally Posted by isuzurover

In series vehicles (and others with mechanical speedo drives), the ODO reading is directly related to the speedo reading - as they are both driven by the same cable. IME 110/defender speedos under-read on standard tyres but are spot on if you fit 33's.

The D3/4/RR(?) is a different kettle of fish. As it has an inbuilt GPS(?) and a billion sensors there is not necessarily a correlation between the speedo reading and the ODO reading (though there could be?). Jesse - I assume you have standard wheels? (sorry if you have mentioned and I missed it). Maybe this is yet another software glitch???

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A squillion sensors and they still can't get it right. :D:D:D

If it uses a GPS to measure speed and distance, wouldn't that make the size of the tyres irrelevant?

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Originally Posted by vnx205

A squillion sensors and they still can't get it right. :D:D:D

If it uses a GPS to measure speed and distance, wouldn't that make the size of the tyres irrelevant?

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Exactly right, but the on board GPS hidden screen for speed aleast on mine is 5kph slower than the speedo, so speedo must get signal from another source. Problem seems to be that odometer reading is also out.
I think there is an adjustment to recalibrate for new tyres, maybe it thinks your wearing the tyres out faster than you are.
I'll compare mine, but I'm in QLD and on most flat roads at the moment would be in knots.
Cheers Ken

Most modern cars take their speedo input from the ABS rings on one of the driveshafts.

Garry

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Originally Posted by mowog

The code wont work for me. I can get the screen for the pin but it does nothing?

Are there any other codes?

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Sorry, the code works for a D3, not sure about a D4. the D3 was more of a pattern than a code you may need to try some trial and error hoping its is still a 3 digit number! You might be able to google it somewhere?

Each measurement system has inaccuracies even GPS.

All odometer and speedo values will be correct again when the GPS Sytem don't work anymore, the battery dies and people begin to look at the real world, street signs and road maps again.

The reliance of the modern world on the "TRUTH" that comes off and out of a black box GPS computer never ceases to amaze me - whilst working they are great but switch them off or break them and how do you know where you are.

At best its a useful tool and aid to get you through the real world rather than the other way around. 100% reliance on them would be not be wise.

I love those KM Markers on some highways that enable you to check your odometer and speed. Even the 10km markers along main highways and can be used to verify odometers and speedos and bring your attention into the real world rather than a screen a few cms in size on the dash board. This has the added advantage of focusing attention on the road rather than on a menu on navigation unit.

In the remote back blocks and off road your awarenes of position relative to real topography and a papermap is more important than where a computer thinks you are on a matrix of excited electrons on a miniture screen.
:):):):):wasntme:

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Originally Posted by gghaggis

Jesse - not quite a "glitch", but that reminds me - have you re-calibrated the SatNav (there's a function in the Nav setup). You need a decent straight road to get it spot on. I think this would also reset the trip computers.
Gordon

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Gordon - have not done a recalibration, but will do so when I'm re-united with the bus in a week or so. Given that I've suddenly found I've done more km than thought I need to get it in for a service too - so will see what the dealers dudes have to say about it too.

And yes, I do have standard size tyres (255x55/19) tho not standard manufacturer as I'm running Pirelli Scorpions - not that this should make any difference.

http://www.aulro.com/afvb/d3-d4-rrs/...ml#post1847705