Speedo vrs GPS

boots · 05-12-2014, 06:05 PM

Results from using my gps yesterday. Seems our speedos are way off which we already know so BMW was correct in setting our speedo on the high side.

Car Gps
30 28.3
40 38.1
50 47.7
60 57.3
65 62.1
70 67
75 71.9
80 76.6

Tom C · 05-12-2014, 11:10 PM

Looks like the speedo is just over 4% optimistic.

boots · 05-13-2014, 04:01 AM

Yep your right. Also the faster we go the more its off. I just didnt publish the rest of my test results. To me they should have made it correct. But at least these results let us know where we stand vrs GPS.

05-12-2014, 06:05 PM	#1
boots Curve Thrasher 623 Rep 3,773 Posts Drives: 2013 Bmw m5..White/Blk. Join Date: Nov 2012 Location: Cypress Tx iTrader: (0)	Speedo vrs GPS Results from using my gps yesterday. Seems our speedos are way off which we already know so BMW was correct in setting our speedo on the high side. Car Gps 30 28.3 40 38.1 50 47.7 60 57.3 65 62.1 70 67 75 71.9 80 76.6 __________________ 2013 Bmw M5-Alpine White/Black-Oem gloss blk powder coated wheels-Expel clear bra-35% tint-Rpi Gtm Exhaust-Rpi Downpipes-Rpi Scoops-Halim Cazimi Performance Tune-KwV3 coilovers Country run Last edited by boots; 05-12-2014 at 07:24 PM..
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05-12-2014, 11:10 PM	#2
Tom C Captain 45 Rep 646 Posts Drives: M8 GC Comp, Shelby GT500 Join Date: May 2013 Location: Maryland iTrader: (0)	Looks like the speedo is just over 4% optimistic.
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05-13-2014, 04:01 AM	#3
boots Curve Thrasher 623 Rep 3,773 Posts Drives: 2013 Bmw m5..White/Blk. Join Date: Nov 2012 Location: Cypress Tx iTrader: (0)	Yep your right. Also the faster we go the more its off. I just didnt publish the rest of my test results. To me they should have made it correct. But at least these results let us know where we stand vrs GPS.
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