Bimmerfest - BMW Forums

Bimmerfest - BMW Forums (http://www.bimmerfest.com/forums/index.php)
-   E36 /7 Z3 (1996-2002) (http://www.bimmerfest.com/forums/forumdisplay.php?f=7)
-   -   Z3 Speedometer error (http://www.bimmerfest.com/forums/showthread.php?t=661844)

senikc 12-02-2012 08:33 PM

Z3 Speedometer error
 
I have a 1999 Z3 speedometer is about is about 8 MPH slow, I have checked it with my GPS, also the car has a trip computer which displays the same speed the Garmin GPS does. I feel like the sending unit in the differential should supply the same signal to the trip computer as well as the analog speedometer. I believe the instrument cluster has been changed out at some point in time, prior to my purchase.

any suggestions or thoughts on the error.

Thanks for any information.

Charles

Blacklane 12-03-2012 04:21 AM

Look over this thread: http://www.bimmerfest.com/forums/sho...d.php?t=551995

senikc 12-03-2012 05:02 PM

Speedometer
 
Thanks so much for the information, I did a search prior to posting but did not find the thread. It's a shame BMW did not do a recall to repair this item.

Thanks again

Pinecone 12-04-2012 07:02 AM

Why? It meets their specifications.

BMW specifications are that the speedo read no lower than actual speed and no higher then 10%+2.4 MPH. So at 60 MPH, it is perfectly acceptable for the speedo to read 68.4 MPH.

senikc 12-04-2012 05:09 PM

speedometer error
 
You have a point, after all why would anyone want to know they are driving 43 mph in a 55?

Pinecone 12-05-2012 06:19 AM

It has to with German TUV requirements that the speedo NEVER read lower than the actual speed.

You can get it closer by changing your tire size. Running 255/40-17 rear tires on our M Roadster and 265/41-18s on the E46 M3 have both speedos almost spot on.

Or one could get a GPS (very useful for other things) and use the speed readout in it.

smayo964 12-05-2012 10:03 AM

Agree with Pinecone on the tire size change. I changed my rears from 50 series to 55's and my speedo is right on the money. The hard part was re-learning not to drive 4-5 miles over what I wanted. LOL


All times are GMT -7. The time now is 08:03 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms