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Speedometer calibration accurate in 996?

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Old 07-03-2006, 08:02 PM
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Kirk (the DC one)
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Default Speedometer calibration accurate in 996?

Having been in Boxsters for 7 years, I noted that the speedometer always read 4-5% high (readout was 60 mph, actual speed was 57 mph). This was (effectively) standard on all Boxsters. New to the 996, should I expect the speedometer to be accurate or is it also 5% off? TIA.
Old 07-03-2006, 08:25 PM
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washington dc porsche
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Mine is about 1.5mph or less off from my portable GPS up to 173mph, which is the more accurate I don't know.
Old 07-03-2006, 08:30 PM
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Kevin H. in Atl..
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Mine reads about 4mph high at all speeds, as did my Boxster.
Old 07-03-2006, 09:36 PM
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Dutchie in NC
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Mine is about 1.5mph or less off from my portable GPS up to 173mph, which is the more accurate I don't know

Where did you take the car up to 173mph... I gotta go to that heavenly place!
Old 07-04-2006, 08:56 AM
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washington dc porsche
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A nice 3 lane HWY in MD some call it a Sportbiker's heaven. This morning was a perfect day since the trafic lights are set for rush hour and there's no one on the HwY due to the holiday.

Originally Posted by Dutchie in NC
Mine is about 1.5mph or less off from my portable GPS up to 173mph, which is the more accurate I don't know

Where did you take the car up to 173mph... I gotta go to that heavenly place!
Old 07-04-2006, 08:01 PM
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JR944
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'99 C2 w/ factory 18" wheels and tire sizes reads almost exactly 4mph high at all speeds too.
Old 07-04-2006, 09:57 PM
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42empress
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I am 3 mph fast based on gps
Old 07-04-2006, 11:06 PM
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Ess_Three
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My C4S reads 175 when the GPS says 169.
Old 07-05-2006, 10:32 AM
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996 Convert
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WDC,

What road is this? I must go!
Old 07-05-2006, 11:42 AM
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ZX9RCAM
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My 99 996 reads 5-6mph high according to my GPS after I put 285/30 tires
on the back.
Old 07-05-2006, 12:11 PM
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NNH
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I got a radar reading of 119mph when my speedo said 123mph.
Old 07-05-2006, 01:14 PM
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ZX9RCAM
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Originally Posted by NNH
I got a radar reading of 119mph when my speedo said 123mph.
Did a ticket accompany the radar reading.......???
Old 07-05-2006, 01:21 PM
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Joe2000C4Cab
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I consistently get +5mph at any speeds I've checked.
Old 07-05-2006, 01:29 PM
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NNH
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Originally Posted by ZX9RCAM
Did a ticket accompany the radar reading.......???
No, only a certificate from the Silver State Classic
Old 07-05-2006, 02:47 PM
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krisd
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My speedo is 4mph fast at all speeds above 20mph.

That Silver State Classic looks like it is a great event. May have to get this on my calendar.


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