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Thread: GapTool and correcting speed reading

  1. 2nd September 2021, 07:01 PM #1
    gavinwibrow's Avatar
    gavinwibrow
    gavinwibrow is offline YarnMaster Silver Subscriber
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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.
    D4 MY16 TDV6 - Cambo towing magic, Traxide Batteries, X Lifter, GAP ID Tool, Snorkel, Mitch Hitch, Clearview Mirrors, F&R Dashcams, CB
    RRC MY95 LSE Vogue Softdash "Bessie" with MY99 TD5 and 4HP24 transplants
    SADLY SOLD MY04 D2a TD5 auto and MY10 D4 2.7 both with lots of goodies
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  2. 2nd September 2021, 07:18 PM #2
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    Tombie
    Tombie is offline OldBushie
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    Change tyre diameter.

    For full advice have a look in FAQ on Gap Site.
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  3. 2nd September 2021, 09:07 PM #3
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    gavinwibrow
    gavinwibrow is offline YarnMaster Silver Subscriber
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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
    D4 MY16 TDV6 - Cambo towing magic, Traxide Batteries, X Lifter, GAP ID Tool, Snorkel, Mitch Hitch, Clearview Mirrors, F&R Dashcams, CB
    RRC MY95 LSE Vogue Softdash "Bessie" with MY99 TD5 and 4HP24 transplants
    SADLY SOLD MY04 D2a TD5 auto and MY10 D4 2.7 both with lots of goodies
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  4. 5th September 2021, 10:42 PM #4
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    John_D4
    John_D4 is offline ChatterBox Subscriber
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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"
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  5. 9th September 2021, 03:32 PM #5
    Redtail
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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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