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Old 09-19-2017, 05:29 AM
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Join Date: Aug 2017
Location: Metro Vancouver
Car: 2002 M3 Coupe 6MT
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Default Help me make sense of AKMB Speedo / Tacho coding

I'm doing a project on my E46 M3. I want to correct the speedometer, which is configured from the factory to read higher than actual speed. I picked up a bmw scanner so I can get at the EEPROM to fix the place where the value of the displayed speed is inflated. However, while I was at it, I wanted to make sure the speedometer is set for the correct number of pulses corresponding to the size of tires on the car, which are not OE sizes. I found something that doesn't make any sense, namely these values, which are set for much larger tires than anyone could even put on this car. A screen capture of the ncs dummy is attached to show the optional values.

Code:
K_ZAHL_TACHO
	4846_imp/km
K_ZAHL_TACHO_KOMPL
	4846_imp/km
K_ZAHL_WEG
	4797_imp/km
K_ZAHL_WEG_KOMPL
	4797_imp/km
The OE rear tire sizes are 255/40-18 or 255/35-19 and the CSL had 265/30-19. The first two are 496 revs/km and the third is 510 revs/km. 491 corresponds to a 265/35-19, which is a "taller" than standard tire. I don't understand why these values would be in the daten, unless they were modified by someone. When I bought the car, it was wearing 265/35-19, which could explain the 4912 value. Shouldn't the values for the speedo and odometer be the same, and correspond to the actual tire sizes?
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Last edited by bimmerdriver; 09-19-2017 at 05:07 PM.


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