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#121
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#122
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I guess it's possible there is a correction factor built in to allow for the tyre wear but that would require the original tyre size to be known... too complex, even for BMW.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#123
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#124
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#125
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never the other way round, unless of course you put larger diameter tyres on than standard. Be interesting to how your indicated speed compares to GPS speed, assuming that’s accurate.
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X5 E70 3.0d M-Sport , 2010 Titan Silver , ZF 6HP28, 320hp. X5 E53 3.0d Sport, 2006 LeMans Blue, ZF 6HP26, diesel . |
#126
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In my experience it doesn't matter. Worn tire vs new it is virtually the same reading on the speedo.
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#127
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Nailed it, deepblonde. Which is why I won't calibrate the speedo to be precise (with respect to a GPS i.e. true speed) on worn tyres - that could result in a Speedo reason low when new tyres are fitted.
Of course, this isn't what we are talking about here - we are only talking about making the speedo dial match the calculated velocity value - and it's that calculated velocity value that I'm not sure about. And I don't think that the calculated velocity value is adjustable - or at least not in the way we are discussing. So it's all rather academic.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) Last edited by wpoll; 12-29-2018 at 05:16 AM. |
#128
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Esp. on my motorcycle, which has a larger difference between new and worn diameters and wears a lot quicker - 5000-6000 miles from new to worn out! The math on this is pretty murky, as the actual effective rolling diameter is dependant on tyre brand, sidewall construction, inflation pressure, temperature, vehicle load.... the list goes on. ;-) Back to the regular scheduled thread subject.... ;-)
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#129
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The speedometer is set by bmw to be wrong on all bmw cars. I have a bunch of different models and all are 2 mph at least off. I normally run 57 to do 55 mph. Some are worse off than that.
They do it to cover their butts at home. If a manufacturer there causes a person to get a ticket because of the speedometer they are legally liable.
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Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install |
#130
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Just code it to be accurate if you want. Its changeable.
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Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install |
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