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Old 07-14-2006, 03:36 PM   #1
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Speedometer Question

After constantly being passed on the highway by minivans and dump trucks I thought it was time to test my speedometer. My wife and I drove side by side and we found when the Boxster said 70 MPH, the other vehicle said 64 MPH. Has anyone else ever experienced this problem and/or is this a typical problem with Porsche?

I have only owned the car for about a month and absolutely love it! However, when I feel the need for speed (as is often the case), I would like to accurately know how fast I am going.

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Old 07-14-2006, 03:45 PM   #2
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My speedo is 4 mph fast so at 64 mph on my speedo im going 60mph. This was confirmed with radar. No not a ticket issue.
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Old 07-14-2006, 03:53 PM   #3
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joshuaalbert, how do you know your wife's car is accurate?

Mine is 3 MPH fast, which is the normal factory setting. Your dealership can dial this in to be more accurate.

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Old 07-14-2006, 05:11 PM   #4
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The factory setting comes out to about 3-4mph fast. When I plugged in a OBDII reader and watched the readings, I was going 4mph at idle sitting in the garage so Porsches don't just "look" fast when they're sitting still.
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Old 07-14-2006, 07:09 PM   #5
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Mine is about 4 MPH slow according to the CHP radar trailer.
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Old 07-14-2006, 07:45 PM   #6
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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?
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Old 07-14-2006, 07:57 PM   #7
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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!
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Old 07-14-2006, 08:41 PM   #8
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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
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Old 07-14-2006, 10:21 PM   #9
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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.
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Old 07-15-2006, 08:37 AM   #10
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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.
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Old 07-15-2006, 08:43 AM   #11
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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.
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Old 07-19-2006, 12:07 AM   #12
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Insatiable

My ,03 was radared @ 110kph and speedo showed exactly115
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