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Thread: Odometer correction

  1. #1
    Expert dpetersen's Avatar
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    Odometer correction

    Hi all!
    My odometer has been out since I purchased the car but has gotten worse (obviously) since fitting 33s today.
    Today I drove 100ks and it only registered as 91.7ks.
    I don’t have a gps so I couldn’t check the speedo but am I correct in saying that if I was doing 92kph on the speedo that I’d actually be travelling at 100kph?
    What’s the best way of fixing this?
    Don’t get me wrong it’s a good way of keeping the Ks down on the car lol but probably isn’t the right thing to do.
    Patrol is an 2006 4.2 wagaon.
    Cheers guys


    Sent from my iPhone using Tapatalk
    2006 4.2 tdi wagon
    TJM BullBar and bar work, Light bar & spotlights, Airtech snorkel, tradie rack, blocked egr, 2inch lift on 33s and a 3 inch exhaust to go with it all.
    Plenty more to come!

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  3. #2
    Patrol God
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    Hey mate. Don't know about correcting it ....
    But mine is same as yours.

    If my needle is on 91-92. I am actually doing a 100. Verified via 3 different gps units.

    2005 4.2 on 33s..


    Sent from my SM-N920I using Tapatalk
    2005 TD42TI

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    dpetersen (1st November 2018)

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    Legendary GQtdauto's Avatar
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    There is a thread here somewhere for correcting a GQ speedo not sure about other models , putting 33's on does alter the speedo but I've gotten used to it .

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    Expert Brissieboy's Avatar
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    Jaycar sell a speedo corrector if you do want to make it read accurately.

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    dpetersen (1st November 2018)

  8. #5
    The master farter
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    With the GU's its easy mate. You can just change the speedo driven gear on the sensor. If you pm me the VIN of your car I can look up how many teeth is on the gear you have and should be able to point you to what you need to buy. The right gear should cost you under $50.

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    dpetersen (1st November 2018)

  10. #6
    Expert dpetersen's Avatar
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    Quote Originally Posted by mudski View Post
    With the GU's its easy mate. You can just change the speedo driven gear on the sensor. If you pm me the VIN of your car I can look up how many teeth is on the gear you have and should be able to point you to what you need to buy. The right gear should cost you under $50.
    Thanks mudski, will send you a pm


    Sent from my iPhone using Tapatalk
    2006 4.2 tdi wagon
    TJM BullBar and bar work, Light bar & spotlights, Airtech snorkel, tradie rack, blocked egr, 2inch lift on 33s and a 3 inch exhaust to go with it all.
    Plenty more to come!

  11. #7
    Patrol God
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    The table in this thread may help.

    https://r.tapatalk.com/shareLink?url...3&share_type=t

    Sent from my SM-N920I using Tapatalk
    2005 TD42TI

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    dpetersen (2nd November 2018), Rossco (28th March 2019)

  13. #8
    Patrol Guru TimE's Avatar
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    Yep, I have a 4.2 with 3.9 diffs on 33s. I use a 15 tooth cog at the gearbox end of the speedo cable. Speedometer is spot on with the 3 GPS units I have used.
    Time Marches On .....and on ..... and on

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    dpetersen (2nd November 2018), Hodge (2nd November 2018)

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    Patrol Guru Cremulator's Avatar
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    I'm interested in a solution for this issue too, as I think my speedo is about 10% out with 33's on my GU III.

  16. #10
    Patrol God threedogs's Avatar
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    Quote Originally Posted by dpetersen View Post
    Thanks mudski, will send you a pm


    Sent from my iPhone using Tapatalk
    X 2 with Mudski an easy fix these days, must set up my GPS and try as well
    I set my cruise control on 107 for a 110 speed on the HWY.
    Think mine is right with 285s but will check.
    One of my GPS has reverted to the the Nth hemisphere, a Garmin 12
    the other is a VMS tourer. dont use them ppl always tell me where to go ha ha ha
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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