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Thread: GapTool and correcting speed reading

  1. #1
    Join Date
    Oct 2011
    Location
    Fremantle WA
    Posts
    3,381

    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 - unmolested for towing "The Brick".
    MY95 RRC LSE Vogue Softdash "Bessie" from Aug 13 - with MY99 TD5 and 4HP24 transplants. Back home Aug 20 after being off road for periods totalling 3.5 years.
    SADLY SOLD MY04 D2a TD5 auto Classic and MY10 D4 2.7 both with lots of goodies.

  2. #2
    Join Date
    Apr 2012
    Location
    Whyalla, SA
    Posts
    5,043
    Change tyre diameter.

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

    AULRO Holiday Reward Points Winner!

  3. #3
    Join Date
    Oct 2011
    Location
    Fremantle WA
    Posts
    3,381
    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 - unmolested for towing "The Brick".
    MY95 RRC LSE Vogue Softdash "Bessie" from Aug 13 - with MY99 TD5 and 4HP24 transplants. Back home Aug 20 after being off road for periods totalling 3.5 years.
    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
    Posts
    1,725
    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
    West of Perth
    Posts
    154
    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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