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Thread: 300Tdi speedo calibration

  1. #1
    Join Date
    Oct 2013
    Location
    East Kurrajong, NSW
    Posts
    954

    Post 300Tdi speedo calibration

    Hi all

    The speedo on my 300Tdi is reading way out and for sometime I have been considering options to calibrate things. Below is roughly what is indicated on the speedo against what (two) GPS's are telling me. The indicated speed is not quite as linear as depicted but i have rounded the figures a little (only a km or two) for ease of use.

    Indicated GPS


    55 - 50
    65 - 60
    75 - 70
    85 - 80
    100 - 90

    it is now running 235/85R16's, which I understand are the same diameter as the original 7.50x16's (is this correct?). It had 255/75R16's when I acquired it.

    My research suggests correction is a matter of replacing the speedometer drive gear as in this diagram

    Rear Flange - Find Land Rover parts at LR Workshop


    There are four different options of gears available;

    FRC3310 20 teeth blue
    FRC3311 21 teeth green
    FRC3312 22 teeth yellow
    FRC3313 23 teeth red

    Blue seems to be the correct one for this tyre size, and I suspect this is the standard factory fit!

    Anyone had any experience with this and how did you resolve it?
    Cheers
    Travelrover

    Adventure before Dementia

    2012 Puma 90 - Black
    1999 Td5 110 Ute - White
    1996 Tdi 300 Wagon - White (the project)

    VKS-737 - Mobile 0972

  2. #2
    Join Date
    Jan 2010
    Location
    Melbourne
    Posts
    1,778
    VDO vision Speedo. Looks OEM. Programmable

    YBE100530 transducer for pickup

    That way if you change tyre size you can just reprogram the Speedo.

    Quite simple to do. Press button on Speedo to start calibration. Drive one km (measure with gps) and press it again. Accurate speed on any tyre size or ratio!

  3. #3
    Join Date
    Oct 2013
    Location
    East Kurrajong, NSW
    Posts
    954
    Thanks manic

    The 300Tdi is a mechanical speedo so not sure this option will work.

    Also seems pretty expensive compared to swapping the drive gear $70 v $500+
    Cheers
    Travelrover

    Adventure before Dementia

    2012 Puma 90 - Black
    1999 Td5 110 Ute - White
    1996 Tdi 300 Wagon - White (the project)

    VKS-737 - Mobile 0972

  4. #4
    Join Date
    Jan 2010
    Location
    Melbourne
    Posts
    1,778
    YBE100530 is a straight swap for the mechanical pick up on the lt230. Used on TD5 up. Just run the wires up to dash and ditch the mech.

    True on cost. But perhaps some time saved in future if you change tyre size again. Never $500, can get them new for around $200-$250.

    I have a blue gear here , never gonna use it.... PM if you want it posted.










  5. #5
    Join Date
    Dec 2006
    Location
    armidale
    Posts
    70
    I had the same readings about 10% out, replaced the blue cog with a yellow one now it reads true 130 300tdi 235/85/16 tyres

  6. #6
    Join Date
    Mar 2007
    Location
    Canada
    Posts
    720

    300Tdi speedo calibration

    Check your odometer first. A lot of times it is a zero offset on the speedo and a drive gear change is not the best idea.

    The VDO is much much better. The stock Lucas gauges are horrible.

  7. #7
    Join Date
    Oct 2013
    Location
    East Kurrajong, NSW
    Posts
    954
    Quote Originally Posted by Red90 View Post
    Check your odometer first. A lot of times it is a zero offset on the speedo and a drive gear change is not the best idea.

    The VDO is much much better. Iím not sure where you are coming up with that high price. They are $180. The stock Lucas gauges are horrible.
    Thanks red90. I just did a quick google and eBay search to come up with the $$, but that included a transducer.
    Cheers
    Travelrover

    Adventure before Dementia

    2012 Puma 90 - Black
    1999 Td5 110 Ute - White
    1996 Tdi 300 Wagon - White (the project)

    VKS-737 - Mobile 0972

  8. #8
    Join Date
    Dec 2006
    Location
    armidale
    Posts
    70
    The yellow cog fixed my odo as well pretty much spot on now according to the southbound Tamworth 5km distance check
    The only problem now is I sit on 90kmh and get 10% worse fuel consumption
    Cog was about $30 from memory
    Last edited by mrb505; 15th December 2019 at 01:43 PM. Reason: More info

  9. #9
    Join Date
    Oct 2013
    Location
    East Kurrajong, NSW
    Posts
    954
    Hi Mrb505

    Thatís good, yeah I had thought about fuel consumption and figured it wouldnít be a great result on that front!

    Cheers - Simon
    Cheers
    Travelrover

    Adventure before Dementia

    2012 Puma 90 - Black
    1999 Td5 110 Ute - White
    1996 Tdi 300 Wagon - White (the project)

    VKS-737 - Mobile 0972

  10. #10
    Join Date
    Nov 2008
    Location
    Black Mountain, Eastern Vic.
    Posts
    768
    As others have posted, gear frc3312 yellow - 22teeth is the one.
    My 130 with 235 tyres is now spot on. Odometer now reads 3% low now though.
    Terry
    56 86" 2.0 P UK built, driven here overland.
    63 88" 2.25 P Canvas top. found in a hidden gully.
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
    2000 P38 4.6
    2010 Guzzi 750

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