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Thread: How do I correct my SpeedO.

  1. #16
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    I have since purchased this car, is it adviseable to take it to a place like VDO or replace the gears in the speedo unit itself ? (may be cheaper?)

  2. #17
    Photographer and Backyard Mechanic Rinmax's Avatar
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    Default Re: How do I correct my SpeedO.

    Cheapest solution - crack open your speedo, and with a black marker cross out the numbers and right them in their new spots. Replace speedo, problem solved at minimal cost.
    "It's an ingenious solution to a problem that should never have existed in the first place." - JM

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  3. #18
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    sounds ghetto enough to work, as a last resort.

    im looking into replacing the gears in the speedo first ;-)

  4. #19
    DIY Bloodline Domestic Engineer Talasas's Avatar
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    Default Re: How do I correct my SpeedO.

    I've heard before that some instrument places can recalibrate the speedo and then you don't need to stuff about changing the drive gear for it. Ring around, there's a place here in Adelaide that claims to do all sorts of wonderful things with speedos.

    http://www.adelaideinstruments.com.au
    "In the beginning, the universe was created. This has made a lot of people angry and has widely been regarded as a bad move." -HHGG

  5. #20
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    Being in ACT i have rung a few places.
    they have said $150 for a recalibraion or $300 for a ratio box to convert the signal. Its either one of those or change the sender in the gearbox itself and me not having any tools here in ACT makes it hard to do it myself

  6. #21
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: How do I correct my SpeedO.

    You can change the speedo sender, it should be bolted to the side of the box, change it to something that had the same rear diff ratio as you have. Hope that you don't have to change the corresponding gear inside the box as well

    If you're never planning to change the diff, $150 to recalibrate the speedo sounds good.
    Teh UZA80 - Project Century - Remotely p00'd by association

  7. #22
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    research has lead me to think that a change inside the box is needed if I am going to change that I may as well get a ratio box as it will cost the same time/money as I have very little tools here currently (just moved!)

  8. #23
    Casual Carport Converter Grease Monkey mux's Avatar
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    Default Re: How do I correct my SpeedO.

    Kedders,

    Like I said mate... i'm happy to help out. Time, Tools and such.

    I'm still looking for the right ratio diff and other means...
    Actually I should be able to help, I've got the original Auto box in the garage.
    we'll probably have to pull it apart to get the gears out...

    Leave it with me

    MUX

  9. #24
    she loves me coz im a Conversion King love ke70's Avatar
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    Default Re: How do I correct my SpeedO.

    surely you can just change the speedo drive gear in the gearbox?
    find a few different cars with that box and see what gearing each one runs. with the gearboxes ive played with. you unscrew the cable, undo the one bolt that holds it in, and the outer slides off and the ratio is etched into the shaft. might even crossbreed to different gearboxes.
    half a day at a wreckers might get u a few different units to try...
    MY RIDE, 2 Door LHD KE70 sedan with 1G HKS stroker: http://www.toymods.org.au/forums/showthread.php?t=51760

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  10. #25
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    no rush mate im still finding out what are available options there are ;-)
    if you get a chance id still welcome your help!

    edit yeah its not like im scared of tyring things its more I dont have the tools nor the work area atm with my unit

  11. #26
    Junior Member Grease Monkey rick q's Avatar
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    Default Re: How do I correct my SpeedO.

    The only other thing to be aware of is that when your speedo is recalibrated, it doesn't change the accuracy of the odometer.

    After the speedo is fixed, the odometer will be reading the same error (i.e. 10% further than you've actually travelled or whatever the original speedo error was!!) It's important to some - but not too others!!
    Cheers ..... Rick Jones
    Fraser Clubman

  12. #27
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: How do I correct my SpeedO.

    very true. This however is a modded mx73 i doubt ks are important, well they arent to me!

  13. #28
    she loves me coz im a Conversion King love ke70's Avatar
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    Default Re: How do I correct my SpeedO.

    rick q, depending how u calibrate the speedo that is. if the drive gear is replaced then the odo will be fixeded

    cheers, andrew
    MY RIDE, 2 Door LHD KE70 sedan with 1G HKS stroker: http://www.toymods.org.au/forums/showthread.php?t=51760

    Punctuation is the difference between 'I helped my Uncle Jack off his horse' and 'I helped my uncle jack off his horse.'

  14. #29
    I definitely ain't a Chief Engine Builder wagonist's Avatar
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    Default Re: How do I correct my SpeedO.

    I was trying to figure out Rick q's theory as well.

    the odometer & speedometer both work off the same input. If one's out, so's the other.
    Get the speedo reading accurately & the odometer will be accurate(ish) too.

  15. #30
    Junior Member Grease Monkey rick q's Avatar
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    Default Re: How do I correct my SpeedO.

    What happens is :-

    You've changed the gearing on the cable drive at the gearbox to the closest thing you can get. However the speedo is still out (for the sake of the argument, let's say it's reading 10% fast because the cable is still spinning 10% faster than it should be to get an accurate speed).

    You take the speedo to an instrument technician, who adjusts the spring tension on the speedo needle. This then makes the needle sit in the right spot so the speedo reads correctly. However, the odometer is direct driven by the cable (which we've just said is running 10% too fast). That means the odometer clicks over 10% faster than the distance you've actually travelled - even though your speedo is doing just fine.

    Hope that helps clear it up - I've just gone through the research bit because I've got this same problem on the Clubbie after changing the diff.
    Cheers ..... Rick Jones
    Fraser Clubman

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