MB odometer accuracy

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ScimmyMike
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MB odometer accuracy

Post by ScimmyMike » Fri Apr 05, 2019 3:09 pm

I think but may be wrong that MB gauges are VDO, if so the VDO set that I fitted to my 6b and calibrated with sat nav GPS speeds always read high mileage wise oddly though actual speed wasn't far out


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MB odometer accuracy

Post by simmit » Sun Apr 07, 2019 4:11 pm

For what it's worth I run manual 'box (auto. may be different?) on 15x7 Woolfies with 205x65 tyres. Speedo and satnav now both agree.



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MB odometer accuracy

Post by Roger Pennington » Sat Apr 13, 2019 11:37 am

gtcse8 wrote:
Wed Apr 03, 2019 9:16 pm
Roger Pennington wrote:
Wed Apr 03, 2019 8:56 pm
I've used a GPS speedo for years, and would trust it's accuracy over the normal speedo
Don`t forget the "Normal " speedo" is allowed to be 10 per cent out, I have never heard about the "Absolute" accuracy on pratnag units, they will have trouble on hilly roads such as in my area. :shock:

I used to travel ALL OVER when as a service engineer and I did find a slight lag or deficiency between the differing pratnags that I used. :roll:
Actually Mark, I didn't mention anything about satnags in my post. For info, I neither own nor use a satnag.


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MB odometer accuracy

Post by gtcse8 » Sat Apr 13, 2019 5:33 pm

Flippin `Eck Roger
Summat got lost here, only took 10 days for reply to arrive :lol:


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MB odometer accuracy

Post by Andrewsait » Wed Jun 19, 2019 12:30 pm

Hi All,

Just to resurrect this one I finally did a reasonably long journey in MD54 where I remembered to record the start and finish mileage according to the odometer.

According to the car the total distance was 176 miles, according to the satellites it was 169 miles. So the difference is 7 miles which is roughly 4% of the total mileage which doesn’t seem too bad. If you have a capped classic car insurance with, say, an annual mileage limit of 5,000, then you would hit the this roughly 200 miles too soon.

I suppose then the question is which one is correct, the car or the satellites? I’m not sure there’s an easy answer to that one.

Andy



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MB odometer accuracy

Post by scimjim » Wed Jun 19, 2019 12:49 pm

Andrewsait wrote:
Wed Jun 19, 2019 12:30 pm
I suppose then the question is which one is correct, the car or the satellites? I’m not sure there’s an easy answer to that one.
I think it’s quite an easy question to answer :D


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MB odometer accuracy

Post by drcdb15 » Wed Jun 19, 2019 8:19 pm

Andrewsait wrote:
Wed Jun 19, 2019 12:30 pm
According to the car the total distance was 176 miles, according to the satellites it was 169 miles.
Just for comparison, what is the distance according to Google Maps?


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MB odometer accuracy

Post by Andrewsait » Thu Jun 27, 2019 8:56 am

According to Google Maps it is 167 miles. But as a comparison I recently tested my modern car odometer against the tracker satellites over 4 roughly 100 mile journeys. The result was that the tracker satellites were consistently 5%-6% under the odometer. I am wondering if it is the way the digital maps used by satnavs and trackers record the roads.

Basically the roads are plotted as a series of straight lines joined by nodes, and therefore they, to a degree, straighten out bends in the road, effectively cutting corners. The car, on the other hand has to follow the curves of the road.

My theory is that over a long journey this all adds up to the difference e are seeing between the satellites and the odometer.

Andy



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