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I have the same KMBI_E38.C12 cluster in mine. I opened my TRC file from my cluster and from my reading to get an accurate speed value just change the settings in the 4 addresses listed to the Japanese variant in NCS Expert.
The two bytes for speedo calibration and scale length should be at addresses 00B8, 00B9 are 11, 33. Changed to 09, 3C to select Japanese (accurate) speedometer.
The complemented data that should be at addresses 00EC, 00ED are EE, CC. Changed to F6, C3. (Also Japanese listing)
Japan is the one country BMW left as precise from all my reading.
That being said, I really have no desire to change mine, I kinda need the buffer. I am always targeting +8MPH over the posted speed limit and that puts me at +5MPH over.
Last edited by Overboost; 01-01-2019 at 07:15 PM.
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