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 v. OBDII v. GPS

psperl
 Share

Recommended Posts

psperl Member

psperl

Posted
Posted

I installed a Pioneer AVG-VDP1 Vehicle Dynamics Processor in my car a few months ago and it informed me that my speedometer was about 7% fast via GPS. Recently I bought an Innova 1303 for clearing CELs and checking codes, and I noticed the "Live Data" feature is able to read some engine info. What surprised me is that the MPH readout from the OBDII port is correct and matches the GPS reading. Why would the speedo (both digital and analog) read out different values than the OBDII computer? Is there some calibration step? Thanks!

-Pete

Link to comment
Share on other sites
psperl Member

psperl

Posted
  • Author
Posted
:welcome:

Please do a search here - this topic has been covered many many times.

You know, before I posted this, I was thinking about how I should probably do a thorough search before posting... yet I didn't. I'm not surprised that it has been covered. Sorry for my negligence and Thanks for the heads up!

Link to comment
Share on other sites
perryinva Member

perryinva

Posted
Posted

Don't feel bad at all, I had brought the same topic up a few weeks ago and DID do a search. While I love the people at Renntech, this has to be, hands, down , the absolute worst search engine of ANY message board I have been on (at least 20-30). It CONSTANTLY returns topics that have NOTHING to do with the keywords. Very frustrating.

To answer your question, the speedo is intentionally 4 to 5 mpg high for liability and european laws. My PGS also corresponds exactly with the Autoenginuity software reading the DME speed.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing
×
×
  • 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.