Inaccurate speedometer

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Inaccurate speedometer

Porsche9 Inaccurate speedometer 10-30-2013, 09:39 PM

Spinnaker I believe all Boxsters do... 10-31-2013, 12:44 AM

kk2002s GPS tells the story. The 8-9... 10-31-2013, 05:04 AM

tanque55 Are you running stock tires,... 10-31-2013, 05:45 AM

RandallNeighbour The small difference between... 11-01-2013, 10:49 AM

Mark_T Mine reads roughly 7 kph high... 10-31-2013, 05:52 AM

ilikeching mine too are 7 khp faster, so... 10-31-2013, 07:44 AM

NewArt I believe that it is an... 10-31-2013, 08:26 AM

Mark_T You make a good point. In my... 10-31-2013, 08:30 AM

rick3000 In the past, I clocked my car... 10-31-2013, 08:27 AM

Mark_T I'd really like to shrug that... 10-31-2013, 08:34 AM

rick3000 It might be paranoia, or it... 10-31-2013, 08:41 AM

t_raven In the manual it says that... 10-31-2013, 12:14 PM

thstone My speedo indicates -3mph as... 10-31-2013, 12:19 PM

Deserion Mine shows 3mph high,... 10-31-2013, 06:08 PM

Porsche9 So with the Boxster it... 10-31-2013, 09:21 PM

CoBeerToad It's not the calibration of... 11-01-2013, 04:19 AM

Timco Would 17" vs 19" tires make a... 11-01-2013, 04:25 AM

Wret Probably not, but it can.... 11-01-2013, 07:59 AM

Kenny Boxster Interesting. My speed is... 11-01-2013, 06:25 AM

gj3ny My 2002 has stock wheels but... 11-01-2013, 07:32 AM

10-30-2013, 09:39 PM	#1
Porsche9 Registered User Join Date: Sep 2013 Location: Chandler, AZ Posts: 1,796	Inaccurate speedometer We have several signs that show your speed and after going by several I noticed that my speedo shows about three to four mph over actual speed. I also did a side by side comparison with my buddy driving his car and I again came to a three to four mph difference. My question is there something that can be done to correct this? What is causing this. I have stock turbo look wheels with factory recommended tire sizes so I am pretty sure this is not the issue.

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