Speedometer Question

[velvet_jones]

Mine is about 4 MPH slow according to the CHP radar trailer.

[RandallNeighbour]

So someone spell this out for me. If I've got the cruise set at 65 in a 65 mph zone and a cop shoots his radar at me, am I really going 4 mph over the limit or what?

[velvet_jones]

If your speedo is 4 MPH SLOW and it says you are at 65 then you are realy at 69 MPH. So he or she could give you a ticket no matter what your speedo says. Sucks huh!

[MNBoxster]

Hi,

Porsche uses what they call a Safety Factor, indicating usually 3-5 miles faster than actual speed. For pre-2000 models, you can retrieve actual speed in KPH from the diagnostic function of your Climate Control Display, along with many other data points...

Happy Motoring!... Jim'99

[crzn427]

I frequently drive my wife's '04 past a CHP radar indicator. When the radar says I am going 65mph the spedo says I am going 68.

[ricklin]

Borrow or buy a handheld GPS. 100 bucks or so, very accurate speed. My 06 indicates about 2mph faster than actual according to the GPS. Both my Toyotas are about the same.

[Brucelee]

Make sure you have the correct tire and rim size on the car. That could be your issue IF it is the Box that is incorrect.