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2nd June 2014, 22:26 | #191 |
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Okay Guys, fair enough.
I was rather pleased to enable the digital speed readout in my car. As, I then had three different instruments giving three different readings , I was just intrigued about which one was closest to the truth.
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19th June 2014, 08:09 | #192 |
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Update
I have now had the message centre digital speed display activated in my car and had an opportunity yesterday to compare readings over a 300 mile trip.
Up until now I had believed that my analogue speedometer over-read by 10% based on a comparison with a 'Road Angel' device. I now find that, at 70 mph, my speedometer's error is more like 5% when compared with the car's digital display. But more surprising was that, at slow speeds such as 15 and 20 mph, it appeared to agree with the message centre figures exactly. These are initial impressions so I will continue to monitor it as carefully as I can, but it seems that the error on my speedometer dial is not linear as I first thought. Simon
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19th June 2014, 08:55 | #193 | |
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Quote:
if 70 or above is 5% (i.e. 70 = 73.5 80=84) then i would accept this as ok. Don't forget as the speed gets lower the offset gets smaller when dealing with percentages.
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30th June 2014, 11:15 | #194 | |
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Quote:
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30th June 2014, 11:22 | #195 |
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Well, that looks close to 10% over read on the analogue speedo.
It would be nice to know what the actual speed would be at the same time. |
30th June 2014, 19:39 | #196 |
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Hi All,
I have just had the digital MPH enabled on my retro-fitted message centre curtsey of Big Russ, and the speed, compared with the speedo, is about the same as Dorset Bobs. I was just wondering if anybody had investigated the possibility of have the engine temperature showing in the message centre like the digital MPH does. I realize that it may require changes to a string of data with the BMW interface as the digital MPH did, and may be a lot of trial and error to get there, but it would save having to go through 1 to 19 and then to 7 with the trip button if it could be done. Cheers, Pete.
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30th June 2014, 20:13 | #197 | |
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Quote:
It's interesting when you look closely that the reading appears very close to 10% over on the needle from 20 mph to 50 mph. But look closely at 60 and its definitely not as much as 10% and it's even less when you look at 70 it only appears to read around 74mph on the needle not 77 as you might expect. So obviously the overread % isn't constant.
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1st July 2014, 06:35 | #198 |
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As I said originally it is normally about 5 to 7 % over read at normal road speeds. compared to true measured speed.
I know that because I use it to set my cruise control to the fastest safe speed in order not to get tickets, so I can do an indicated 138 km/h and just be on the safe side in a 120 zone. |
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