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29-06-2016, 08:50 PM
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#1 |
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S2 - Picking it up
Join Date: Feb 2013
Location: London
Posts: 67
Casino cash: $13034  |
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 |
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29-06-2016, 09:14 PM
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#2 |
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S5, Sport Off, DSC M-track
 
Join Date: May 2012
Location: london
Posts: 563
Casino cash: $8371 |
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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1979 E24 635csi , 730d work horse , Porsche GT4 |
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29-06-2016, 11:46 PM
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#3 | |
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CSL Register Uber-poster!
Join Date: Sep 2009
Location: Cambridge
Posts: 6,460
Casino cash: $27763 |
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.
__________________
 UK CSL No.020 ... after 7 years of ownership  I've now SOLD it !!! 
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30-06-2016, 12:09 AM
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#4 |
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S5, Sport Off, DSC M-track
Join Date: Nov 2009
Location: Reading
Posts: 731
Casino cash: $19587 |
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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Now with added SG CSL. |
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30-06-2016, 09:51 AM
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#5 |
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S4 - Getting the hang of it
Join Date: Feb 2013
Location: Bucks
Posts: 143
Casino cash: $9222 |
Trust the GPS not the speedo!
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30-06-2016, 10:27 PM
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#6 | |
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CSL Register Uber-poster!
Join Date: Nov 2009
Location: Cornwall
Posts: 7,057
Casino cash: $35793 |
Quote:
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02-07-2016, 08:44 PM
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#7 |
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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
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#8 |
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S5, Sport Off, DSC M-track
Join Date: Jan 2011
Location: South East
Posts: 580
Casino cash: $12226 |
GPS always reliable
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04-07-2016, 09:45 AM
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#9 | |
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S6, Sport On, Traction Off
 
Join Date: Dec 2010
Location: Norwich
Posts: 1,585
Casino cash: $17591 |
Quote:
__________________
Mike R Sarcasm is just a free service I provide. Nordschleife, there's only two barriers to worry about - the ones on the left and the ones on the right .CSL number 044 |
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