mglamarche

I would appreciate input from those of you who knowledge regarding speedometer calibration. I have a mobile navigation unit that digitally gives the current speed. It is very accurate as I have confirmed this in several cars with digital readouts. When I place the mobile unit in my 2003 Turbo, the car speedometer reads 2 mph higher below 30 mph and 3 mph faster at speeds above this. The Porsche service department assures that ALL Porsche's read faster than the actual speed (this is not the case with my Cayenne S). My next question to the service representative was, “if this is the case, is the odometer reading more miles than what is actually on the car?” The answer was “no, they work on two different mechanisms.” I may be wrong and please correct me if I am; I felt insulted by this answer and just bit my tongue deciding to wait until I was sure. Your verdict please.

Beej

Both statement they made are true. Ie all Porsche speedo's read fast, especially in turbo's. Yours sounds better than most, as mine (and many others) read 5mph fast at 60mph! The odometer however does not seem prone to as much error, so therefore the speedo read out must be independently "adjusted" in the computers somewhere is my guess.

Cheers,

Beej

Last930

It just goes to show you - Porsches are faster than other cars, even at the same speed!!

ZX9RCAM

My 996 reads 6mph faster at pretty much ALL speeds......

kilrgt

yea my car too, mine is 7 KPH over, I have taken it in and they told me its normal...

mmmmmm

I believe there is a strict penalty in Germany for the manufacturer if their speedometers register lower than the actual speed. The BMW's are usually off by 10% on the high side.

greg911

Mine is also off by 3mph over 30 mph.