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Thread: Track Width

  1. #31
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    Using a wider axle and offsetting rims back to the standard track is stupid from an engineering perspective and i would be very surprised if any states RTA would make this a rule as it will have axles operating well outside of their design and loading tolerances. The standard track is irrelevant to the safer operation of a replacement axle. I would check this with another engineer at your RTA or with an approved engineering signatory.


    NCOP - which may or may not be a part of your regulations:

    http://www.infrastructure.gov.au/roa..._2011%20v3.pdf


    Track
    . Where non-original axle or suspension cross-member components are fitted,
    the offset of the wheel in relation to the axle or hub assembly used must not be increased by more than 12.5mm each side of the vehicle based on the specifications of the axle components used. If an axle assembly is shortened then the track width limit is taken as the axle manufacturers original track dimension, less the amount the assembly has been narrowed, plus 25mm.


    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  2. #32
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    And in NSW from the RTA

    http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf


    An important requirement for all replacement wheels is that the wheel track must not be increased by more than
    25mm beyond the maximum specified by the vehicle manufacturer for that vehicle.
    Where non original axle or suspension components are fitted, the offset of the wheel in relation to the axle or stub
    axle assembly used shall not be increased by more than 12.5mm each side of the vehicle based on the specifications
    of the axle components used. If an axle assembly is shortened then the track width limit is taken as the axle
    manufacturers original track dimension, less the amount the assembly has been narrowed, plus 25mm.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  3. #33
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    Quote Originally Posted by wagoo View Post
    That's insane and extremely angry making!I wonder if some of these dumb stupid QLD DOT regulations are formulated by competent Engineers or lazy useless beaurocrats (Sp?)?
    The considerably heavier series 2B FCs,had axles with the same spring spacing(up front),were 4'' wider and with identical steering linkage layout to Fozzy, so where is the engineering issue here? Chassis strength? I don't think so.They have identical rails,And Fozzy would have shorter spring hangers,so subject to less twisting stress.
    Wagoo.
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  4. #34
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    And here is the kicker for the QLDers! The QLD Code of Practice

    http://www.tmr.qld.gov.au/~/media/e0...tionspart2.pdf

    Pg 20 +

    The replacement axle must have the same WMS-WMS measurement as the factory axle.

    Wheel track is to be retained.

    Wheel stud patter must be retained - you can weld and drill new ones.

    There is more to it including brakes etc. And mods must be approved by the axle manufacturer. Sounds like the only real option for Landys is the use of the Salisbury.

    Mods not allowed under the Code:

    Fitting axles which are not compatible with the original vehicles components

    Mods to the axle housing other than fitting brackets

    Alteration to the vehicles braking.

    This also explains the benefits of Bud customs axles etc in QLD.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  5. #35
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    Quote Originally Posted by Slunnie View Post
    And here is the kicker for the QLDers! The QLD Code of Practice

    http://www.tmr.qld.gov.au/~/media/e0a39a3b-4e6e-4052-8e8d-1243ba61dbf3/codeofpracticelightvehiclesreductionspart2.pdf

    Pg 20

    Wheel stud patter must be retained - you can weld and drill new ones.
    You can weld up the old stud holes and drill new ones on a cast iron hub?

  6. #36
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    Quote Originally Posted by wagoo View Post
    You can weld up the old stud holes and drill new ones on a cast iron hub?
    You'd be a braver man than me with the welding on the hub.

    AS1554 standards must be used.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  7. #37
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    Quote Originally Posted by Slunnie View Post
    You'd be a braver man than me with the welding on the hub.

    AS1554 standards must be used.
    I'm not that brave.I couldn't find the shaking head icon to tack onto the end of that question.
    Wagoo.

  8. #38
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    off the beaten track

    Hi All

    If you are looking at modifying a vehicle, then seeking registration for it. Surely, enlisting the help of a suitably qualified engineer to oversee, then to sign off on completion, would be the way to get around any bureaucratic nonsense.

    To determine the correct offset of the rims, extend the line through the centre of the swivel pins, at a spot on the road under the tyre. At this point and the centre line of the tyre should coincide, but in practice these two points do often fall short, leaving a gap between the two points called a scrub radius. Changing the tyres from a small diameter to a larger diameter does close the scrub radius.

    With a solid or beam axle the camber angle of the wheel is always zero degrees, making the tyre centre determination a lot easier than if the vehicle has independent suspension.

    ref; Wheel options for the MGF



    Cheers Arthur

  9. #39
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    Problem is Arthur, The OP and around half the contributors to this thread are from Queensland,a state with a bureaucracy dating back to the Bjelke Peterson dictatorship. And I'm not sure they are afforded the option of going down the engineering report route.
    Wagoo.

  10. #40
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    Quote Originally Posted by wagoo View Post
    Problem is Arthur, The OP and around half the contributors to this thread are from Queensland,a state with a bureaucracy dating back to the Bjelke Peterson dictatorship. And I'm not sure they are afforded the option of going down the engineering report route.
    Wagoo.
    pretty much this...I have heard of stuff being "engineered", blue plated, and heard that it hasnt met DOT's guildines...so the only way is to go to DOT and have them tell you what can and cant be done and use there listed/approved engineers....

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