My D3 speed warning is set at 100mph and beeps at exactly 100mph on the speedo (when tested on a private track obviously).
As said previously I would start at wheel circumference calibration.... see what its calibrated as and check what your wheels are etc
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89forever
Current stable.....
07 A8 D3 4.2tdi
08 S5
09 A4 Avant 2.0tdi
04 TT 225
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