Electronic speedos
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  1. #1
    1000+ Posts Haakon's Avatar
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    Default Electronic speedos

    Who out there knows anything about electronic speedos? My R25 speedo (which has apparently got a bad reputation?) is a bit pessamistic in its readings - tells me we are only doing 70 kph when I know its at least 100 kph, and at 60 its only reading around 45 kph.
    Is it something unpleasant like stuffed electronics, or maybe something simple like a sticky spindle?

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  2. #2
    1000+ Posts Shobbz's Avatar
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    Sorry for being silly

    But its km's not mph?

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  3. #3
    1000+ Posts Haakon's Avatar
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    Yeah, all in km . Its always read a little under what I'm actually doing (which I'm happy to say I figured out before the police figured it out for me...), but since it came home from WA, its much worse. Which is what made me think a sticky spindle, a few weeks without use made it a bit stickier?
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  4. #4
    Good Sport danielsydney's Avatar
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    Luke cass should know all about this i guess he has owned them hasnt he. I hope my C3 speedo never plays up as i fear it more sophisticated than the R25..

  5. #5
    Fellow Frogger! deja vu 25's Avatar
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    Hi Haakon

    I had installed a speedo from the UK on my V6 a couple of years ago, and it too read too low (about 15km/h). I took the speedo back out (fun job) and simply pulled off the needle and moved it clockwise a fraction so that it was just above the 0 km/h on the actual speedo - and voila, worked like a dream, as I tested it with a reliable source and was only out by a km or two!!!

    Cheers
    Cheers - Luke

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  6. #6
    1000+ Posts Pugnut403's Avatar
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    We put a new cable in the Transit the other day, and it reads about 35% under. We will have to get onother one quick.
    Pugs Rule!

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  7. #7
    1000+ Posts Haakon's Avatar
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    Quote Originally Posted by LukeCass
    Hi Haakon

    I had installed a speedo from the UK on my V6 a couple of years ago, and it too read too low (about 15km/h). I took the speedo back out (fun job) and simply pulled off the needle and moved it clockwise a fraction so that it was just above the 0 km/h on the actual speedo - and voila, worked like a dream, as I tested it with a reliable source and was only out by a km or two!!!

    Cheers
    Hmm. Dont think that will work - partly because its been getting worse and moving the needle will I fear be a temporary fix, and also because moving the needle means the odometer is still at the wrong calibration, clocking up the K's slower.
    Might have to take it to a speedo specialist...

    Hows life in a manual going - longer legs on the freeway I bet (and dare I ask, but what did they sting you for the conversion?).?
    Did you find the factory manual reverse light lead, and did the crankshaft accept the gearbox input shaft bearing OK?

    My auto is now behaving itself perfectly (Murphy, thats not funny.. ), so I guess I will just have the manual ready to install and drive the auto till it defianantly drops...
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  8. #8
    1000+ Posts alan moore's Avatar
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    There is a variable resistance adjustment in the back of the speedo.If
    you know that 100kph equals a true 80, the speedo can be powered up on a
    signal generator to read 100 and then wind the resistance down so that the
    speedo reads 80. I did this on mine six years ago and various other electronic fixes. If you know a mechanic with one of the Renault test boxes, it can also power up the speedo.
    '56 Renault 750 (16TS Power)
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  9. #9
    1000+ Posts Haakon's Avatar
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    cool, thanks alan. Gives a bit of hope that it wont be too expensive
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

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