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308 Speedo Repair/Rebuild

Discussion in '308/328' started by alhbln, Aug 22, 2013.

  1. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
    What happens when you switch it on, does it stay at 10 mph until you actually drive? Or does it jump to 15-20mph at low speeds until it reaches higher RPMs?
    Which car/year?
     
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  3. Crowndog

    Crowndog F1 Veteran
    Rossa Subscribed

    Jul 16, 2011
    7,029
    Fairfield,Pa
    Full Name:
    Robert
    I believe all of our speedometer needles rest at 10mph. I was told this was done on purpose because the car looks like it’s moving even when turned off.
     
  4. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
    Calibration has been implemented and tested, and seems to work nicely. I'm converting another 328 Speedo to test it on additional hardware this week.

    Quick question, is anyone still using the old 80 mph limited speedo with the orange bar on the right side?
    I would like to avoid those as the calibration speed at 12'o clock is different to all the other speedos.
     
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  5. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
    Did anyone ever verify his Type 2/3 speedo precision with a GPS or smartphone? I just tested two very good condition unmodified factory ones (my reference), one reads 120 kmh at 140 kmh, the other one 158 kmh. That is 20 kmh off, in either direction.
     
  6. RAC911

    RAC911 Karting
    Silver Subscribed

    Jun 8, 2006
    124
    Arizona
    Full Name:
    Ralph Cacace
    How do you carefully open the speedo. My chrome ring does not move and I do not want to bend the chrome ring to get it off. Any ideas on how it is done? Also what does a test signal to the speedo schematic lokk like?
     
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  8. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
  9. Andythebath

    Andythebath Rookie

    Dec 29, 2019
    8
    Hi Adrian, following your amazing work, I’m looking for a board to convert a US Speedo 1981 308 GTSi with the original Speedo showing 80 mph max before the red line, want convert to Kms as it’s now imported into France, also would the new board solve something I’ve noticed about the needle being particularly slow to reach actual speed? And slow to go back down to zero when stopping? Seems like a good 15 seconds that it takes to reach actual speed at around 70 mph !!
    Thanks Andy


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  10. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
    Do you have the type number of the Speedo (on the paper label attached to the body of the Speedo)? Conversion would require a new faceplate, i remember that Eurospares sells those, as well as a new Speedo board with a conversion software. The 15 seconds are from zero to 70 mph? Could be a mechanical/stiction issue. Are you in Europe?
     
  11. Andythebath

    Andythebath Rookie

    Dec 29, 2019
    8
    Hi Adrian
    I haven’t taken the Speedo apart yet and yes I’m trying to source a faceplate in km as Eurospares are a bit pricey I think, yes I’m in France, the Speedo needle takes time to catch up with the actual road speed, ie it is very slow.
    When I take the clock out I’ll get the reference from the label and let you know
    Thanks


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  13. ATSAaron

    ATSAaron Formula Junior

    Jun 1, 2004
    937
    Shady Shores, TX
    Full Name:
    Aaron Bunch
    If anyone has a dead unrepairable speedometer they are willing to part with, I am looking got the clear light ring. Mine is missing.

    Aaron
     
  14. Andythebath

    Andythebath Rookie

    Dec 29, 2019
    8
    If anyone has a spare km faceplate for the Speedo I’d be interested? Thanks


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  15. kiwiokie

    kiwiokie Formula Junior

    Aug 19, 2013
    932
    Tulsa, OK
    You may try contacting the two main rebuild options in the US (Palo Alto and North Hollywood) as I understand they print custom faces and may have a km template they can use.


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  16. GordonC

    GordonC F1 Rookie
    Rossa Subscribed Owner

    Aug 28, 2005
    3,677
    Calgary, AB, Canada
    Full Name:
    Gordon
    You'll have to specify which series speedometer you have, and how many odometer digits - they vary in turn signal light shape (arrow or circle), and 5 or 6 digit odometers.
     
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  17. Skippr1999

    Skippr1999 F1 Rookie
    Silver Subscribed

    Dec 22, 2009
    2,885
    Charlotte, NC
    Full Name:
    Skipp
    Just found this thread while searching. Any update on the availability of the new boards for a 328 ?
     
  18. Andythebath

    Andythebath Rookie

    Dec 29, 2019
    8
    Image Unavailable, Please Login

    If you know of someone who can supply km replacement for this? Cheers



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  19. alhbln

    alhbln Formula 3
    Consultant Owner

    Mar 4, 2008
    1,676
    Berlin, Germany
    Full Name:
    Adrian
    Currebntly in testing, should be available soon :)

    Maybe a template PDF helps for having a new one produced, see attachment. This should be silk printed in white on a black painted aluminium plate 0,4-0,6 mm thick.
     

    Attached Files:

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  20. Andythebath

    Andythebath Rookie

    Dec 29, 2019
    8
    Fantastic, looks good, I’ll give it a try


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