Is there any way to recalibrate or recode the speedo?

yardiewrx · 02-18-2020, 01:26 PM

I purchased a used 2015 with 19x9.5 and 19.10.5 Vorsteiner wheels. They are sporting 275x30 & 295's x 30's. Well I've taken it to work a few times and knew traffic wasn't going nearly as fast as the speedo was indicating so I checked it on my GPS and it's running about 5 mph faster than my true speed. Is there any fix to this apart from getting 35 series tires?

GregW / Oregon · 02-18-2020, 04:22 PM

Quote:

Originally Posted by yardiewrx

I purchased a used 2015 with 19x9.5 and 19.10.5 Vorsteiner wheels. They are sporting 275x30 & 295's x 30's. Well I've taken it to work a few times and knew traffic wasn't going nearly as fast as the speedo was indicating so I checked it on my GPS and it's running about 5 mph faster than my true speed. Is there any fix to this apart from getting 35 series tires?

I don't know the answer, but I can tell you my '15 M4 with stock size Michelins indicates 2 mph higher than true speed throughout the range.

Pic18 · 02-19-2020, 01:23 AM

Every BMW I have every owned the speedo has been off by at least 2-3 mph.

swagon · 02-19-2020, 03:38 AM

It is a legal European requirement for speedometers to read more than the actual real speed, I think it is between 0 and 10 % + 5 kph or something like that.

And yes, it is possible to code out this feature and have the speedometer indicate real GPS speed. Not sure if it works for the dial or just the digital readout in the middle of the instrument cluster (if you have it turned on).

mjposner · 02-19-2020, 07:22 AM

Every BMW I have owned is 3-5 mph above true speed. Might spare you a ticket some day

RoundelM3 · 02-19-2020, 01:31 PM

Easily coded out both on the analog speedo and the digital readout as well.

NickyC · 02-19-2020, 01:49 PM

Super duper dumb question of the day here: if your speedometer is running high, does your odometer suffer the same fate? Does putting larger wheels/tires on the car make the car think more miles are being put on it? Slag away lol.

TideMD · 02-19-2020, 04:03 PM

Quote:

Originally Posted by RoundelM3

Easily coded out both on the analog speedo and the digital readout as well.

Interesting side effect - I coded out the speed offset in order to show true vehicle speed. However, this resulted in the car running exactly 1mph off (can't remember above or below) the target speed when using cruise control. Frustrated me to see the numbers not match infinitely more than I ever cared about the true vs indicated speeds matching.

nearwater4me · 02-19-2020, 04:32 PM

Quote:

Originally Posted by NickyC

Super duper dumb question of the day here: if your speedometer is running high, does your odometer suffer the same fate? Does putting larger wheels/tires on the car make the car think more miles are being put on it? Slag away lol.

That’s actually a very good question.
Interested in knowing this myself.

02-18-2020, 01:26 PM	#1
yardiewrx New Member 0 Rep 10 Posts Drives: F80 M3 Join Date: Jan 2019 Location: Parkland, Fl iTrader: (0)	Is there any way to recalibrate or recode the speedo? I purchased a used 2015 with 19x9.5 and 19.10.5 Vorsteiner wheels. They are sporting 275x30 & 295's x 30's. Well I've taken it to work a few times and knew traffic wasn't going nearly as fast as the speedo was indicating so I checked it on my GPS and it's running about 5 mph faster than my true speed. Is there any fix to this apart from getting 35 series tires?
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02-19-2020, 01:23 AM	#3
Pic18 First Lieutenant 304 Rep 351 Posts Drives: 18' F80 Comp, Spec E46 Join Date: Oct 2016 Location: NoVA iTrader: (0)	Every BMW I have every owned the speedo has been off by at least 2-3 mph.
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02-19-2020, 03:38 AM	#4
swagon Major General 13568 Rep 8,185 Posts Drives: F80 6MT Join Date: Jun 2013 Location: . iTrader: (0)	It is a legal European requirement for speedometers to read more than the actual real speed, I think it is between 0 and 10 % + 5 kph or something like that. And yes, it is possible to code out this feature and have the speedometer indicate real GPS speed. Not sure if it works for the dial or just the digital readout in the middle of the instrument cluster (if you have it turned on). Attached Images __________________
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02-19-2020, 07:22 AM	#5
mjposner Brigadier General 901 Rep 3,071 Posts Drives: 2020 Z4 40i Join Date: Mar 2011 Location: Southwest Florida iTrader: (3)	Every BMW I have owned is 3-5 mph above true speed. Might spare you a ticket some day __________________ 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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02-19-2020, 01:31 PM	#6
RoundelM3 Major General 1838 Rep 6,991 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	Easily coded out both on the analog speedo and the digital readout as well. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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02-19-2020, 01:49 PM	#7
NickyC Lieutenant General 17645 Rep 10,720 Posts Drives: M4 CS. Former G82, x2 F82, F80 Join Date: Nov 2010 Location: Jacked out of my mind iTrader: (23)	Super duper dumb question of the day here: if your speedometer is running high, does your odometer suffer the same fate? Does putting larger wheels/tires on the car make the car think more miles are being put on it? Slag away lol.
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