Is your speedometer off too?

mastatikle · 08-25-2017, 12:56 AM

I have a 2014 GC and my speedometer is off a solid 4-5 mph at any speed over 45. I brought this up to my SA and before I could even finish my sentence he stated "they're built like that from the factory. We have people come in and ask all the time." I haven't had the time to test it but I'm pretty sure the odometer is off as well. If so I beleive this can be a big issue. I'll post updates if anyone is interested. After I design an accurate test. Also saw a coding option witch was titled "show actual speed and not corrected speed". So I'm not sure if this solves the issue. Any input is greatly appreciated

BMWRog · 08-25-2017, 04:44 AM

Yeah, I'd say the last time I checked mine it was about 4-5 mph out too. I checked against a TomTom sat nav on an open stretch of pretty flat motorway, running cruise control for several miles. Under-inflated and/or worn tyres will exacerbate the problem slightly as well.

gregmb · 08-25-2017, 12:28 PM

Quote:

Originally Posted by BMWRog

Yeah, I'd say the last time I checked mine it was about 4-5 mph out too. I checked against a TomTom sat nav on an open stretch of pretty flat motorway, running cruise control for several miles. Under-inflated and/or worn tyres will exacerbate the problem slightly as well.

Same for me - display shows 4 mph over correct gps/Waze speed. Not a problem as I usually forget, so it helps keep me a little closer to the speed limit.

brad850csi · 08-25-2017, 03:06 PM

Change to 275/35r20 and 305/30r20 and you'll get a little bit closer

gregmb · 08-25-2017, 04:31 PM

Quote:

Originally Posted by brad850csi

Change to 275/35r20 and 305/30r20 and you'll get a little bit closer

Yep - that's the plan on the next set of Michelins.

mastatikle · 08-26-2017, 03:12 AM

Yeah I'm picking up 305's tomorrow. Are you guys not concerned about odometer being off? If the car consistently says you're going faster then you are then from my understanding the vehicle will have more odometer miles then it is actually supposed to.

mjposner · 08-26-2017, 06:04 AM

This is sop for every BMW I have owned.

lincvert · 09-05-2017, 08:18 PM

It is a percentage thing so it will only be 4-5 at highway speeds. It is increases as you go faster.

M6-Coupe · 09-05-2017, 10:33 PM

By law, Speedometer must show "no less than actual speed".
Having said that, there are many people seen 165-170 mph on speedometer while the maximum speed of our cars is electronically limited to 155 mph...

08-25-2017, 12:56 AM	#1
mastatikle Lieutenant 69 Rep 469 Posts Drives: m3 Join Date: Aug 2017 Location: CA iTrader: (0)	Is your speedometer off too? I have a 2014 GC and my speedometer is off a solid 4-5 mph at any speed over 45. I brought this up to my SA and before I could even finish my sentence he stated "they're built like that from the factory. We have people come in and ask all the time." I haven't had the time to test it but I'm pretty sure the odometer is off as well. If so I beleive this can be a big issue. I'll post updates if anyone is interested. After I design an accurate test. Also saw a coding option witch was titled "show actual speed and not corrected speed". So I'm not sure if this solves the issue. Any input is greatly appreciated
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08-25-2017, 04:44 AM	#2
BMWRog Private First Class 19 Rep 126 Posts Drives: 2014 M6 Convertible Join Date: Feb 2017 Location: Oxfordshire, U.K. iTrader: (0)	Yeah, I'd say the last time I checked mine it was about 4-5 mph out too. I checked against a TomTom sat nav on an open stretch of pretty flat motorway, running cruise control for several miles. Under-inflated and/or worn tyres will exacerbate the problem slightly as well.
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08-25-2017, 03:06 PM	#4
brad850csi Colonel 1316 Rep 2,349 Posts Drives: 16 F13 M6 Comp Join Date: Jan 2015 Location: Auckland, New Zealand iTrader: (0)	Change to 275/35r20 and 305/30r20 and you'll get a little bit closer
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08-26-2017, 03:12 AM	#6
mastatikle Lieutenant 69 Rep 469 Posts Drives: m3 Join Date: Aug 2017 Location: CA iTrader: (0)	Yeah I'm picking up 305's tomorrow. Are you guys not concerned about odometer being off? If the car consistently says you're going faster then you are then from my understanding the vehicle will have more odometer miles then it is actually supposed to.
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08-26-2017, 06:04 AM	#7
mjposner Brigadier General 898 Rep 3,071 Posts Drives: 2020 Z4 40i Join Date: Mar 2011 Location: Southwest Florida iTrader: (3)	This is sop for every BMW I have owned. __________________ Previous BMW: 16 M4, 13 M6; 14 M235i, 12 BMW M3; 11 BMW M3; 08 BMW M3; 08 BMW Z4M; 04 X3; 02 M3 Convertible; 02 M3; 00 M Roadster; 94 325 convertible; 92 325i Convertible; and 85 635csi My Car Photo Blog: http://carfisheye.blogspot.com/
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09-05-2017, 08:18 PM	#8
lincvert Private First Class 19 Rep 138 Posts Drives: M5 wannabe Join Date: Sep 2012 Location: NOVA iTrader: (0)	It is a percentage thing so it will only be 4-5 at highway speeds. It is increases as you go faster.
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09-05-2017, 10:33 PM	#9
M6-Coupe Major General 1125 Rep 6,066 Posts Drives: F92 M8 Join Date: Feb 2014 Location: Bay area iTrader: (0)	By law, Speedometer must show "no less than actual speed". Having said that, there are many people seen 165-170 mph on speedometer while the maximum speed of our cars is electronically limited to 155 mph... __________________ Current : 2020 F92 Black Sapphire M8 - ZF8 Gone : 2018 F80 Mineral Gray M3 - 6MT Gone : 2016 F82 Austin Yellow M4 - 6MT Gone : 2013 F13 Sakhir Orange M6 -7DCT Gone: 2013 F13 Alpine White 650i -ZF8
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