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NSW engineering cert for 265 70 17's

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  • #61
    Just installed the yellr box V5 using Busha’s detailed post on my 120 2004 4L 5 speed.
    No problems whatsoever and now I can trust the speedo. Thanks Busha.
    A useful facility on it is that the Max speed is saved in the memory so you can recall it at a later date. Useful if your kids drive the car.

    Originally posted by busha View Post
    I have installed the Yellow Box speedo calibrator that works fine on my Grande 120 V6.
    All I have been wanting to do is to fit mud terrain tyres legally on my 4WD. Mud terrains are not available in 265x65x17 size and the next best available size is 265x70x17. This tyre is more than 15mm in diameter to the manufactures recommended tyre which will not comply with current NSW law unless it is certified. http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf
    RTA have confirmed to me via email that certification is required (VSB 14 is not legislated in NSW).
    http://www.rta.nsw.gov.au/registrati...n-creek-qa.pdf
    http://www.rta.nsw.gov.au/registrati...n-creek-qa.pdf
    After much enquiries I finally found a certifier in Riverwood who was willing to check for certification at a cost of $300+GST. http://www.rta.nsw.gov.au/registrati...ulletin_01.pdf
    He specifically mentioned that my speedo has to be calibrated. Speedometer that reads below the actual speed does not comply with ADR, this website may be helpful: http://www.trafficlaw.com.au/speedos.html So my search begins, I emailed few manufacturers enquiring about their suitability of product on Prado Grande. YellowBox responded positively for testing and I had few correspondence with Jenny at Yellow Box www.YellR.com
    who was most helpful and excellent in finding a solution for Prado speedometer [email protected] Finally yellow box supplied me their box with solder joints for testing (they are still working on plug and play version which may not be cost viable depending on cost of connector, etc).
    Installation
    Refer to instructions provided with the YellowBox unit. There is a good installation guide on Installation of another speedo calibrator brand under this thread (I don’t know anything about its usefulness):
    http://www.pradopoint.com/showthread...=certification
    The Yellowbox picks up incoming signal to speedometer, modifies the signal via press buttons functions and sends higher or lower speed signals to the speedometer. Prado signal to speedometer comes via the speed sender unit that picks up speed from four ABS speed sensors. The wire supplying the signal to speedometer is at connector IL1 which is located near Left Side of the Blower Unit in front of passenger seat behind the glove box. To access IL1, glove box needs to be removed which is pretty simple: remove the slim clip-on trim above glove box, remove the screws on glove box, disconnect wires and you see bunch of connectors near the blower unit. IL1 is 18 pin connector.
    Refer photos below:
    [ATTACH=CONFIG]7182[/ATTACH][ATTACH=CONFIG]7183[/ATTACH]
    There are three important wires: (Note-pins numbers are male connector numbers) Pin 2 white with black stripe wire is earth wire, Pin 5 Pink with Blue stripe wire is the speedometer wire, pin 8 black with red stripe thicker wire is power supply wire. Do not use other wires: Pin 4 green with white stripe wire, Pin 6 Pink with blue stripe wire is skid control, Pin 9 is inclination sensor wire, pins 14, 15, 17, 18 are skid control wires, + blanks. Refer marked up photo below:
    [ATTACH=CONFIG]7184[/ATTACH]

    Power to IL1 is through ignition key so I removed the keys before any wiring work (removing ground battery terminal is the best practice though). Note: Wires can be held together before soldering by cutting ends of solder filled wire from yellowbox, stripping the insulation, and tightly winding around wire from IL1 or twisting.
    1. Unplug the IL1 connector and the disconnected side in your hand has female pins in it.
    2. Splice (remove insulation around wire about 10-15mm) white with black stripe earth wire (Pin 2) and solder this to black earth wire from YellowBox.
    3. Splice black with red stripe power wire (Pin 8) and solder this to red power wire from YellowBox.
    4. Cut pink with blue stripe wire (Pin 5) and strip both ends. Solder the pink with blue stripe wire still connected to pin 5 of IL1 connector to green signal output wire from yellow box. Solder the pink with blue stripe wire now disconnected from pin 5 to yellow speed input signal wire from yellow box. (I would slip heat shrink to both ends of wire before solder for insulation).
    Marked up photo of wires after solder:
    5. Insulate the wires and connect the Yellow box.
    [ATTACH=CONFIG]7185[/ATTACH]
    Photo after wires insulated
    Calibration
    Check that there is power to Yellow box (turn on ignition). Drive the car for very short distance and stop. Check that red and green lights flick / blink.
    Now it is time to calibrate. I would take the car for a drive on flat straight high speed road during lowest peak traffic time so that I can effectively check the speed using cruise control.
    Use a reliable GPS and check the speedometer reading against the actual speed reading from GPS. Calculate the difference in percentage terms. If my speedometer is reading lower than GPS speed, then I will have a negative percentage difference. 265x65x17 tyre when reading 100km/hr would be doing 103.3km/hr when fitted with 265x70x17 tyre on the same vehicle. http://www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx
    I would initially calibrate to -3.3% difference. To do this:
    1. Stop the car without switching of ignition and wait for say 1 minute.
    2 Press “+” and “-“ button together for 5 seconds (both green and red lights will flicker few times).
    3 Press the minus (-) button on yellow box for 3 seconds and which will give three long blinks of green light indicating 3%. Make 3 short push of minus (–) button and each short push will give one short green blink. 3 short blinks indicate 0.3%. So I have at total minus (-) 3.3% calibration.
    4 Take the Prado for test run. If there is still speed difference, re-start calibration process until correct speed is obtained. Correct speed for new percentage difference only (ignore previous speed differences). This can be done any number of times until satisfactory result is obtained.

    I have placed this small YellowBox unit above the cover near passenger side feet under glove box so that I can remove and re-calibrate speedometer for two sets of wheels that I intend to have. Any other practical suggestion for location and mounting would be helpful!!
    Sorry it took me a bit longer to post this but I had to take Prado for over 100km test drive on freeway at 100 to 110Km/hr to make sure there are no error messages or the like at high speeds. I have also driven the Prado on all four wheel drive modes with no issues.
    The YellowBox V5 is made in Bundaberg, Queensland with 10 year warranty and available for under $80.00 www.YellR.com. I reckon this is a very good value.
    Cheers
    AB

    Comment


    • #62
      This is an excellent mod, makes my speedo read 100% accurate with 33" tyres: https://www.pradopoint.com.au/forum/...913#post343913
      "Sure it’s quiet, for a diesel, but that’s like being well-behaved… for a murderer."- Jeremy Clarkson

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