I have searched and found plenty of threads on how to fix the speedo issue when changing wheels and diff ratios.
My speedo is reading correct or at least within 1 - 2% of the installed GPS.
However the scanner will show a slower speed of around 5 - 10% at lower speeds and increases in a non-linear fashion as the speed increases.
Is there a fix for this? or has anyone else had this issue?
LS2 - E40 - M6 - 3.91 Diff and 19" wheels
I have put the stock values back in and re-calculated the tire size using the roll out method and as I said the GPS and Speedo read very much the same however the scanner shows slower speeds.