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Thread: GapTool and correcting speed reading

  1. #1
    Join Date
    Oct 2011
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    GapTool and correcting speed reading

    Anyone care to point me in the right direction?

    My D4 speedo reads 5% fast, and if, as I suspect I can, how do I adjust it to read true. I'm aware it won't affect the km travelled.
    MY16 D4 TDV6 - with a little Cambo magic for towing "The Brick"
    MY95 RRC LSE Vogue Softdash "Bessie" (turning circle comparable to QE II) with MY99 TD5 and 4HP24 transplants. Back home Nov 22 after a magic overhaul by Chivalry
    SADLY SOLD MY04 D2a TD5 auto Classic and MY10 D4 2.7 both with lots of goodies

  2. #2
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    Apr 2012
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    Change tyre diameter.

    For full advice have a look in FAQ on Gap Site.

  3. #3
    Join Date
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    Quote Originally Posted by Tombie View Post
    Change tyre diameter.

    For full advice have a look in FAQ on Gap Site.


    Thanks Mike. I'd read the FAQ twice and missed that both times - new glasses perhaps!

    In case anyone else was wondering.

    For Discovery 3 2004-2009 and Range Rover Sport 2005-2009
    Menu–Car Config–Instrument Pack–Tyre Radius

    For 2010+ vehicles


    Only one of the following settings will work and it depends on the car itself. Menu–Car Config–Instrument Pack–
    This setting, Tyre Size MSB – IPC
    Or this one, Tyre Rolling Radius (mm) – ABS
    MY16 D4 TDV6 - with a little Cambo magic for towing "The Brick"
    MY95 RRC LSE Vogue Softdash "Bessie" (turning circle comparable to QE II) with MY99 TD5 and 4HP24 transplants. Back home Nov 22 after a magic overhaul by Chivalry
    SADLY SOLD MY04 D2a TD5 auto Classic and MY10 D4 2.7 both with lots of goodies

  4. #4
    Join Date
    Mar 2016
    Location
    Adelaide
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    I put on 285 60 18’s which are 5% bigger than 255 55 19. Fixed my speedo but the odometer is now reading 5% under. Will fix that problem when I buy a gap tool
    "Land Rover - making mechanics out of everyday motorists for nearly 70 years"

  5. #5
    Join Date
    Nov 2017
    Location
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    Tyre size worked on my 2011 HSE.
    Rooling radius made no difference.

    See:
    Speedo calibration with IIDTool?
    If at first you don't succeed, that's one data point. - xkcd
    ----------------------------------------------------------------------
    2011 Discovery 4 SDV6 HSE

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