29-06-2016, 08:50 PM | #1 |
S2 - Picking it up
Join Date: Feb 2013
Location: London
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Speedo / GPS
Did a very unscientific test at the weekend comparing speed as shown on speedo to GPS on phone. GPS showed 70mph when car indicated 75mph. How do I know which is right!?
Has anyone else compared theirs!? Cheers |
29-06-2016, 09:14 PM | #2 |
S5, Sport Off, DSC M-track
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It will run about 10% out mate,
My speed limiter comes in at 180mph on the speedo but showing 155mph on GPS
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29-06-2016, 11:46 PM | #3 | |
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Quote:
On an AUTOBAHN my Cecil showed a GPS reading of 174 MPH while the needle was off the clock way past the 180 MPH mark.
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30-06-2016, 12:09 AM | #4 |
S5, Sport Off, DSC M-track
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Location: Reading
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I think the M3 speedo is calibrated for the standard 18" wheel setup with 225/45/18 and 255/40/18. Mine was quite accurate when it had 18" winter tyres fitted, but is a long way under with the 19s on.
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30-06-2016, 09:51 AM | #5 |
S4 - Getting the hang of it
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Trust the GPS not the speedo!
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30-06-2016, 10:27 PM | #6 |
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02-07-2016, 08:44 PM | #7 |
S2 - Picking it up
Join Date: Feb 2013
Location: London
Posts: 67
Casino cash: $13034 |
Maybe BMW looking out for my licence then... Got surprised by a mobile speed gun on the A13 recently and worried didn't slow down in time but probably not an issue!
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02-07-2016, 09:05 PM | #8 |
S5, Sport Off, DSC M-track
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GPS always reliable
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04-07-2016, 09:45 AM | #9 |
S6, Sport On, Traction Off
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That's a long way out - mine is on the speed limiter at an indicated 168mph and that equates to a GPS 161mph. Standard CSL 19" wheels and correct rolling radius tyres.
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