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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36 /7 Z3 (1996-2002)

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

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  #1  
Old 04-18-2003, 05:22 PM
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bmargolis bmargolis is offline
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Speedo error

I KNOW that this has been beat to death here and on other forums, but I have a couple of questions.

During the drive to and from Z3 Fest, I had ample opportunity to check my speedometer against my Navmen GPS. With the needle set at exactly 80MPH, the car is actually going 72.4MPH. A 10% error. This error is carried throughout the speed range.

If I ask the dealer to calibrate this error, will they do it? If they won't how difficult is this to do myself Ron?

Thanks,




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  #2  
Old 04-18-2003, 05:31 PM
Mathew Mathew is offline
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You actually can do it yourself.

What you would do is go into the OBC's Service mode (or something along those lines). There's a bunch of info on it here, and it's not too hard to find around the internet. Basically, you hold down the stalk near the odometer for a few seconds, and it will enter the service mode. You will see like a bunch of menus to go into and you press the stalk a certain number of times to carry out a certain action. When you find the "cheat sheet" for this, it will tell you what menu to go with and how many times to press the stalk.

edit - actually I think i may be wrong on this one, maybe someone else can chime in. I was thinking of something else.

Last edited by Mathew; 04-19-2003 at 05:38 PM.
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  #3  
Old 04-18-2003, 05:35 PM
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bmargolis bmargolis is offline
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does anyone have "step by step"

instructions for this? It sounds too simple to me as explained here.
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  #4  
Old 04-18-2003, 05:54 PM
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Ron Stygar Ron Stygar is offline
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Quote:
Originally posted by Mathew
You actually can do it yourself.

What you would do is go into the OBC's Service mode (or something along those lines).
M-Z3's do not come with the OBC.
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  #5  
Old 04-18-2003, 05:59 PM
Mathew Mathew is offline
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d'oh
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  #6  
Old 04-18-2003, 06:01 PM
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Ron Stygar Ron Stygar is offline
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Re: Speedo error

Quote:
Originally posted by bmargolis

If I ask the dealer to calibrate this error, will they do it? If they won't how difficult is this to do myself Ron?
Dealer won't do it since it's within the BMW spec.
You would have to remove the instrument cluster, then it's face shield so that you can pull off the speedometer needle. You then reconnect it without the face shield.
I fed a signal in the differential pick up wiring and made it right on at 70MPH.
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  #7  
Old 04-19-2003, 10:32 AM
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bmargolis bmargolis is offline
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Question how much of a job is this Ron?

?
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  #8  
Old 04-19-2003, 10:48 AM
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Ron Stygar Ron Stygar is offline
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Re: how much of a job is this Ron?

Quote:
Originally posted by bmargolis
?
Depends how handy you are.
You have to remove the cluster, take it apart and build a tool to remove the needle. Many chances to screw things up.
You also would have to purchase an audio signal generator and the necessary pins to hook into the differential pickup connector.
I don't loan things.
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  #9  
Old 04-19-2003, 11:56 AM
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Ron Stygar Ron Stygar is offline
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More info

Quote:
Originally posted by bmargolis
?
My new coupe, based on the speedometer, appears faster than it is. A common BMW complaint.
On the Homecoming trip, I went through a couple of those display radar units. Speedometer indicated 9 to 10 MPH higher than actual in the 60 to 80 range. This error is right at the BMW tolerance or out of tolerance depending on what BMW tolerance you use. A '84 service bulletin states the tolerance as 4%. Don't have the document in front of me, but I believe the tolerance is also stated as 10% plus 2.4 MPH in another document. Will check on this.
If you assume that the tachometer is correct, you come up with the same result.
The '84 BMW service bulletin indicated a way to check the speedometer by feeding a signal into the connector for the sensor mounted on the differential cover. 131 Hz for 60MPH and 87 for 40MPH. Roughly 2.18 HZ per MPH. If off, they had you move the needle on the speedometer and recheck.
To check this out, I purchased a B&K Precision function generator model 4011A which retails for $315.00. Nice unit with a built in counter.
B&K link: http://www.bkprecision.com/
Did a quick check last night (shown below) with the results equaling my above mentioned checks. More detail to come.

Actual/Frequency/Indicated
20/43.6/24
40/87/46
60/131/69
65/141.7/74.5
70/152.6/80
80/174.4/90
100/218/111
120/261.6/132.5
140/305.2/155
160/348.8/177




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  #10  
Old 04-19-2003, 12:56 PM
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Ron Stygar Ron Stygar is offline
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Tim UK Cluster removal link

http://www.zroadster.net/tim/custom/dials.html
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  #11  
Old 04-19-2003, 08:05 PM
DanT DanT is offline
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geez Ron i wish i had your time!!!

too much work for me i dont think itd be worth it to me. I'd just know in the back of my head that the speedo was off by a few mph and just drive the thing.....but thats just me
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  #12  
Old 04-19-2003, 08:55 PM
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Ron Stygar Ron Stygar is offline
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Re: geez Ron i wish i had your time!!!

Quote:
Originally posted by DanT
too much work for me i dont think itd be worth it to me. I'd just know in the back of my head that the speedo was off by a few mph and just drive the thing.....but thats just me
More time to me means more projects that are not finished.
I sometimes think that I will run out of things to do, but the list keeps getting longer.
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  #13  
Old 04-20-2003, 05:30 PM
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bob lindquist bob lindquist is offline
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option

Back in the 80's I remember aftermarket computers that you hooked up to the car driveshaft and had functions like speed, time to distance (like the OBC thats difficult to install in the M's) etc.

Wish we could install the bmw obc in the M's even if only to get accurate speed.
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  #14  
Old 04-20-2003, 07:33 PM
JetBlack330i JetBlack330i is offline
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Very simple solution: increase your tire diameter by one size.
Did you by any chance muck with OEM tire sizes?
I just got the Delorme GPS and was surprised to find out that my speedo is practically dead on accurate.
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  #15  
Old 04-21-2003, 05:54 PM
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Pinecone Pinecone is offline
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Quote:
Originally posted by JetBlack330i
Very simple solution: increase your tire diameter by one size.
Did you by any chance muck with OEM tire sizes?
I just got the Delorme GPS and was surprised to find out that my speedo is practically dead on accurate.
Our M Roadster was very close in comparison to the Garmin StreetPilot III.

The M3 is off a good bit.

Another way to maybe deal with it, is the motorcycle guys have a device that inserts between the pickup and the speedo to "adjust" the speedo. I saw something about it, but haven't looked into it.

I wish BMW just put in a calibration screw to take care of this.
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  #16  
Old 04-22-2003, 05:59 AM
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bob lindquist bob lindquist is offline
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VDO Spedo

I'm looking at this possibility. its about 150$
Attached Images
File Type: bmp vdo spedo.bmp (6.6 KB, 101 views)
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2000 Imola Red M Coupe

Dinan suspension, M rotors /Axxis pads
Eurosport Cam Kit 1, touch lane change
Zaino polish, Beach Sand
Garys mirror adapter, S54 Oil Cooler
seat tilt coupling nuts, spare tire

"life's to short to drink cheap beer"


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  #17  
Old 04-22-2003, 08:50 AM
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bob lindquist bob lindquist is offline
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option 2

This is the Coralba rally computer. at 310$
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File Type: bmp c-mini.bmp (34.1 KB, 93 views)
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2000 Imola Red M Coupe

Dinan suspension, M rotors /Axxis pads
Eurosport Cam Kit 1, touch lane change
Zaino polish, Beach Sand
Garys mirror adapter, S54 Oil Cooler
seat tilt coupling nuts, spare tire

"life's to short to drink cheap beer"


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  #18  
Old 04-23-2003, 03:26 PM
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ARC///M ARC///M is offline
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speed demon

Bob talk to me,I have seen what Ron did and have been there,It is not a hour project and there is always the chance of scrathing the cluster cavity on the way out,then you can drop the pin or break the cable connector,Sound good so far.!Anything can be done if you take your time and not rush,Always remember that the car may not go after your done..
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  #19  
Old 04-23-2003, 04:50 PM
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bob lindquist bob lindquist is offline
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programable cruise

If we could get a programable cruise then we could calibrate it once!

although the carabala mini computer is quite small and could be mounted below the dash giving accurate speed readings.
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2000 Imola Red M Coupe

Dinan suspension, M rotors /Axxis pads
Eurosport Cam Kit 1, touch lane change
Zaino polish, Beach Sand
Garys mirror adapter, S54 Oil Cooler
seat tilt coupling nuts, spare tire

"life's to short to drink cheap beer"


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  #20  
Old 04-23-2003, 06:51 PM
chazzy chazzy is offline
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My S54 shows 80 mph when I'm travelling at 3,000 rpm in 5th gear. Calculating it out, I'm actually going 70 mph when the tach shows 3,000 rpm.
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  #21  
Old 04-23-2003, 06:57 PM
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Ron Stygar Ron Stygar is offline
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Quote:
Originally posted by chazzy
My S54 shows 80 mph when I'm travelling at 3,000 rpm in 5th gear. Calculating it out, I'm actually going 70 mph when the tach shows 3,000 rpm.
Right on.

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  #22  
Old 04-24-2003, 02:34 PM
chazzy chazzy is offline
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I finally built a web version of my spreadsheet:

http://www.368s.com/tools_rpm.phtml

Comments and suggestions are welcome.
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  #23  
Old 04-24-2003, 02:37 PM
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bob lindquist bob lindquist is offline
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table

Quote:
Originally posted by chazzy
I finally built a web version of my spreadsheet:

http://www.368s.com/tools_rpm.phtml

Comments and suggestions are welcome.
You DA MAN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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2000 Imola Red M Coupe

Dinan suspension, M rotors /Axxis pads
Eurosport Cam Kit 1, touch lane change
Zaino polish, Beach Sand
Garys mirror adapter, S54 Oil Cooler
seat tilt coupling nuts, spare tire

"life's to short to drink cheap beer"


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  #24  
Old 05-13-2003, 08:05 PM
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Nick T. Nick T. is offline
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About a year ago I did some extensive comarisons between a Garmin Street Pilot III and my 2002 2.5 Z3ís speedometer and odometer. While I held constant speeds on the GPS my copilot would log the speedometer and tach readings.

The odometer was dead-on (give or take a tenth or two) over many trips of varying length. The GPS readings also checked almost dead-on against the computed speed for the rpm, gear, diff, and wheel diameter. The speedometer was consistently high by about 6%-7% plus 2 mph.

This tells me that while increasing the tire diameter the proper amount will correct the speedo error, it will at the same time make the odometer read low - maybe not a bad thing at resale time if you have low morals.
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  #25  
Old 05-14-2003, 04:48 AM
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hdd3md hdd3md is offline
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another way--

i use a heads up display tapped into the tachometer and speedometer signals going to the cluster. the only drawback is that it is in KM instead of MPH, but the speed is dead on, and is about 10% less than actual speed on the speedo.

it takes 5 minutes to install and retails for about $200...

www.defi-hud.com

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