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Thread: Speedo calibration with IIDTool?

  1. #1
    Join Date
    Nov 2017
    Location
    West of Perth
    Posts
    64

    Speedo calibration with IIDTool?

    GAP's FAQ states:
    How to adjust the speedometer when fitting bigger tires (tyres)
    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
    I tried with the second setting, TRR, on my 2011 D4 to no avail.
    Has anyone had any success, and if so, what setting worked? (Save me mucking about!)
    Some can only cruise this land, the rest of us rove it as we wish ... in the best 4 by 4 by far.

  2. #2
    Join Date
    Jul 2013
    Location
    Tom Price - Pilbara WA
    Posts
    1,187
    I've got a 05 D3 so adjusting the tyre radius worked for me
    Shane
    2005 D3 TDV6 loaded to the brim with 4 kids!
    http://www.aulro.com/afvb/members-rides/220914-too-many-defender-write-ups-here-time-d3.html

  3. #3
    Join Date
    Nov 2017
    Location
    West of Perth
    Posts
    64
    Okay, you can all stop looking now. I worked it out!

    I changed the Tyre Size MSB - IPC from 31 to 33. Now it thinks I've got 33" tyres, the speedo is bang on.

    While I was there, I set the Tyre Rolling Radius (mm) – ABS to 370 - 255/55R19 to reflect what is actually fitted. Any change to this in my earlier experiments made no difference to the speedo.
    As an aside, this was originally 371 - 255/50R20. Not surprising as this is what shows on a VIN check via Topix.

    ... one more bit of info for the Starship's knowledgebase.
    Some can only cruise this land, the rest of us rove it as we wish ... in the best 4 by 4 by far.

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