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Originally Posted by WagnerX5
Question, how do you guys know these percentages? Did you have yourselves clocked like a trap speed? Seems like a lot of "estimation" work here. No offense. I am very aware, from my law enforcement buddies, that speedometers over 75 mph can sometimes be off a few notches. However, my track friends (those who love to run the 1320) have checked before and the speedometer seems to be right where their trap speeds were....so again, how are we getting this percentage of deviation?
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You may have a right-on speedometer. Have you checked what your OBC says vs your speedo?
I went thru 3 different radar speed signs at 60 and was puzzled when they showed up as me doing 56-57. That's when I started double checking what I actually was doing at different speeds. It was a consistent -5%.
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2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2  , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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