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Like I said it wasn't possible on the E90 without the updated KOMBI software. We have one of the latest E89 sgdatten flashed on our ECUs. The E90 guys have only two options for tire sizes. We have seven. Basically tricking the car to think we have bigger tire diameter, thus less impulses per kilometer (or something like that) and the result is accurate speedo showing. The key is in the new version of the software installed in the car, not what a coder has on his workstation.
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