05-04-2014, 02:03 PM | #23 | |
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Anyways, it was a good discussion and thanks for your time and explanation; however I'm not convinced about 5-10% deviation.. still I assume 2-3% (I respected you and increased 1%)
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05-04-2014, 04:08 PM | #24 | |
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Yeah, speedo calibration might be different between the US and Europe (but if you aren't "restricted" by any legislation, then they might have even larger tolerances to keep up with US style 26" rims JK ). AFAIK, several M5 owners have verified their 167-172MPH speedo readings with GPS as being around 155MPH true speed. I assume their GPS' speed is correct and that the speedo deviation is accordingly All in good fun and good clean discussion with you mate |
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05-04-2014, 06:40 PM | #26 | ||
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05-04-2014, 06:51 PM | #27 |
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There is no speed governor on 5th gear. My DCT showed 165mph on 6th gear while it hit the limiter at 155mph on 7th.
So, no, there is speedo error.
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05-04-2014, 07:05 PM | #28 | |
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05-04-2014, 10:55 PM | #29 | ||
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05-05-2014, 01:25 AM | #31 |
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So reviewed the dash cam footage and the GPS is in fact saying... 159MPH, so... w/ that being said, we're limited at 159? not 155? I shoulda tried shifting to 6th lol.
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05-05-2014, 06:41 AM | #32 |
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05-05-2014, 06:43 AM | #33 | |
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gmd2003 said the limiter set in at 155MPH (GPS) but that he managed to get 156MPH (GPS). You did 159MPH. Do you and gmd2003 have the same tire size? That can account for some variation and possibly also a slight deviation in speed limiter tolerance as well? |
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05-05-2014, 06:47 AM | #34 | |
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Posted today on a thread over at the F8x Boards:
http://f80.bimmerpost.com/forums/sho...postcount=1112 Quote:
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05-05-2014, 07:39 AM | #36 | |
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My confused sign was because I didn't understand your post I understood the OP to say that the M5 with MT6 wasn't limited at 155MPH, not that his speedo wasn't limited... Not sure if there are cars with a limited speedo Here is what the OP wrote: Quote:
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05-05-2014, 06:55 PM | #37 |
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It means your GSP has error. you need to throw it away and get the new one that does not show more than 155 (JK)
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05-06-2014, 07:17 AM | #38 |
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This has been addressed here before but I am too lazy to search for the thread. There is a fixed formula for the "error margin" which is a percentage plus a fixed amount. I think it was something like 3% plus 2mph (don't quote me on the 3 and the 2 as those are just guesses from memory). So there won't be a fixed percentage over.
And there is only one reason that BMW does this - to avoid any potential liability. Nothing more; nothing less.
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05-06-2014, 09:07 AM | #39 | |
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05-06-2014, 09:17 AM | #40 |
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I have no factual basis to argue, but the 10% seems high to me. That means when I am running 60 the speedo would read 68.2. In my experience, the margin of error has not been that great.
But I guess it is consistent with the 155 reading 172. Looks like I can drive even faster now!
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05-06-2014, 10:36 AM | #41 | |
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When driving in 60km/h my speedo only has a error of 2-3km/h (as per digital speed display). That's a 5% deviation. However the deviation is larger than 5% at higher speeds for some reason... |
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05-06-2014, 11:14 AM | #42 |
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Sir, would you please address me the source of this formula?
The reason I'm asking is because most of the time I am driving in Freeway and I want to know the safe speed before I get pulled over
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05-06-2014, 12:15 PM | #43 |
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The formula isn't saying that all speedometers are overstated by 10% + 2.2mph. It is saying they unless your speedo is reading HIGHER than that amount it will just be considered to be within the acceptable tolerance.
Not all speedo are going to read the same margin of error. Some could be extremely accurate, some could be off by 2% and some off by 10%. All BMW has said is that they could possibly be off by 10% + 2.2mph.
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05-06-2014, 12:17 PM | #44 | |
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It's probably why the speedos overstate actual speed. If they were understating them they would all have to be addressed every time.
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