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Speedo Accuracy??!!

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berttie21:
I installed a fiscon bluetooth kit today and the MFD now shows the current speed. however this is quite different from the speedo when travelling above 50mph.

MFD = 48mph   Speedo = 54mph
MFD = 70mph   Speedo = 81mph
MFD = 80mph   Speedo = 93mph

I had a friend follow me in s ford focus and at 80mph in the focus the speed was reading about 95mph.

is this common with all speedo's of somthing common with vw of GTI's?

Also does anyone know where the fiscon pulls the speed data from compared to the speedo?

Cheers

Top Cat:
All speedo's are like this. You can play with the air-con settings and get the true accurate speed reading up on their.  :happy2:

keith:
Aye my sat nav is always dif from the dash, lower speeds are more accurate but higher exagurate on the speedo.

Janner_Sy:
mine isnt that bad. according to my tom tom when it shows 70mph, my speedo is over reading about 3mph. @100mph on the tom tom my speedo is about 5mph out until about 145mph when it goes a little wayward

Poppa Dom:

--- Quote from: simonskerton on September 08, 2009, 10:14:52 pm ---mine isnt that bad. according to my tom tom when it shows 70mph, my speedo is over reading about 3mph. @100mph on the tom tom my speedo is about 5mph out until about 145mph when it goes a little wayward

--- End quote ---
Of course, this was on the autobahn or private road/track :)

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