Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Speedometer reads high


Recommended Posts

I've verified this by 2 different methods and my speedometer reads 3-4 mph high.

One possibility I've explored is the difference between 17" tires and 18" tires.

I compared the two and at most, the difference is 1mph.

Anyone have this issue? Is there a way to recalibrate the speedometer?

 

 

'

Link to comment
Share on other sites

Yes indeed - both my Boxster S and 911 Turbo have the same thing. About 3 MPH over actual speed. I took it into my dealer to fix and was told they had to be within 5 MPH - anything over / under they would fix. So I’ve just dealt with it. In my case it had nothing to do with tire size - all stock. I could see where that would affect it as well but a larger diameter would reduce the speed reading. I’ve just accepted probably all Porsche models around this period read higher than actual speed. 

Link to comment
Share on other sites

From my understanding, cars are made like that.  My digital and analog speedometer is consistently exactly 4 MPH faster than actual road speed.  Confirmed by many roadside radars.  I just adapt.

Edited by DBJoe996
Link to comment
Share on other sites

  • Moderators

The manufacturer's set the speedo high for two reasons: First, to keep from being sued if you get a ticket for speeding the speed is reading low; second, to run out your warranty faster.  And if you don't think the second is true, there was a class action suit by Honda owners after a TSB stating that was leaked to the public...………….

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.