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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 12-02-2012, 08:33 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
Join Date: Oct 2012
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Mein Auto: 1994 Mercedes E320
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
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  #2  
Old 12-03-2012, 04:21 AM
Blacklane Blacklane is offline
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Mein Auto: 1998 Z3 Roadster
Look over this thread: http://www.bimmerfest.com/forums/sho...d.php?t=551995
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  #3  
Old 12-03-2012, 05:02 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
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Mein Auto: 1994 Mercedes E320
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
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  #4  
Old 12-04-2012, 07:02 AM
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Pinecone Pinecone is offline
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Location: Maryland
 
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Mein Auto: M Roadster/M3
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.
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  #5  
Old 12-04-2012, 05:09 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
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Mein Auto: 1994 Mercedes E320
speedometer error

You have a point, after all why would anyone want to know they are driving 43 mph in a 55?
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  #6  
Old 12-05-2012, 06:19 AM
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Pinecone Pinecone is offline
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Mein Auto: M Roadster/M3
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.
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'95 Alpine M3 LTW
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'02 Topaz M3
Red/White SRF #4 (Chassis 561)
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  #7  
Old 12-05-2012, 10:03 AM
smayo964 smayo964 is offline
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Mein Auto: 1999 Z3 Roadster
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
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