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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, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 04-10-2002, 11:05 PM
Ron Stygar's Avatar
Ron Stygar Ron Stygar is offline
19,585 Miles
Location: CT
 
Join Date: Mar 2002
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Mein Auto: Z4 M Coupe 6LL93033
Speedo (Mr. Earl) check

Finally got around to adjust my speedometer to indicate a relatively accurate speed. Indicated speed on my '01 Z3-M coupe was 8 to 10 MPH optimistic.
I basically fed a signal into the rear differential
pick-up wiring and moved the needle on the speedometer to match the OBC reading at 70 MPH.
The following pics are from the car sitting in the garage.





Took the car out today for a medium black raspberry ice cream waffle cone to check the results. The following is based on ascending to the indicated point.

Indicated---GPS----OBC
50----------50-----50
60----------59.9---59.9
65----------64.6---64.8
70----------69.3---69.5
75----------74.4---74.6
80----------79.3---79.5

Descending to the point. Still, pretty good.

70----------68.5---68.7

Much better. Although not a big deal, it's just one less thing to think about, wondering how fast you are going.
More detail on this to come.

Last edited by Ron Stygar; 09-25-2004 at 01:46 PM.
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  #2  
Old 04-10-2002, 11:53 PM
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SONET SONET is offline
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Location: HB, Calif.
 
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Posts: 2,831
Mein Auto: 2011 335i, 2013 M3
Clever hack, looks like it did the trick. Perhaps you could post the details on the DIY board?

Congrats! :thumb:

--SONET

P.S. Hmm, now that I think about it maybe I should devise a way to make my speedo as optimistic as yours was... that along with driving a gear down just might keep me away from a few speeding tickets.
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  #3  
Old 04-11-2002, 12:27 AM
Polar Bear Polar Bear is offline
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Mein Auto: '99 M Coupe
OBC .....yum!

Ron,

any chance we might get some info regarding the OBC install for M coupe owners?

a list of components and maybe wiring guidlines?


*drool*
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  #4  
Old 04-11-2002, 09:40 AM
D///Mill D///Mill is offline
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Mein Auto: 2000 Z3 "///M coupe"
Arrow Ron's OBC install info ...

Ron's info regarding the OBC install was covered in the "other board" as his install progressed. Just hafta do some searching ... although it may be (I haven't looked) his web site now. FYI
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  #5  
Old 04-23-2002, 12:53 PM
Ron O Ron O is offline
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Mein Auto: Z3 , S4, Bettle T, Avalon
Speedo adjustment

Is there a way you could suggest to those of us who do not have the digital read out.
Specifically where are the wires and what is their coding color or ident?
Could you post pics of the wireing hack area.
Thanks, Ron O
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  #6  
Old 09-11-2002, 08:45 AM
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scottn2retro scottn2retro is offline
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Location: Huntington Beach
 
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Mein Auto: '02 M3 SMG & '08 135i
Wink Damn clever Ron . .

Without an OBC, if you know the wiring setup for the OBC (again, research .org or probably better yet, check Ron's site) you could tap into the signal that would go to the OBC and check for the (I assume voltage or frequency) from the pickup. Set the meter up beside you and then find some way to accurately measure your speed as you drive past something at a certain speed (I don't know how accurate those 'this is your speed' trailors are). As you drive the car past the speed indicator, note the reading on the meter. Back at the garage, duplicate the signal into the speedo and do the adjustment.

Ron - how did you 'move' the needle (I have not played with a speedo)?
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Old 09-11-2002, 10:50 AM
Ron Stygar's Avatar
Ron Stygar Ron Stygar is offline
19,585 Miles
Location: CT
 
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Posts: 11,143
Mein Auto: Z4 M Coupe 6LL93033
Re: Damn clever Ron . .

Quote:
Originally posted by scottn2retro
Ron - how did you 'move' the needle (I have not played with a speedo)?
Made a tool out of a piece of scrap metal as shown in the following pic. You remove the needle with the tool and push it back on in the correct place.



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Old 09-12-2002, 09:55 AM
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scottn2retro scottn2retro is offline
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Mein Auto: '02 M3 SMG & '08 135i
Ah, now I see why there's a pieces of tape on the speedo face

Last edited by scottn2retro; 09-19-2002 at 09:00 AM.
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