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NCOP 11 / VSB 14 - larger tyres & a lift on a 2017 150 GXL 2.8 D4D without engineering

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  • NCOP 11 / VSB 14 - larger tyres & a lift on a 2017 150 GXL 2.8 D4D without engineering

    Hi folks,

    I've been lurking on PradoPoint and doing a lot of research prior to changing anything on our new GXL D4D. Very pleased with the car but I had great results with aftermarket suspension on my Hilux a few years ago so hoping to get the same on the Prado. I will be using mostly on road, some beach and some gravel track. I don't think I will be rock crawling or mud plugging. I will be putting a towbar on the car but no other accessories (bullbar, dual battery, etc) in the near future and Im happy to change the suspension in the future if this happens.

    Thanks in advance for any comments or advice on the points below.

    My understanding is that WA has adopted NCOP 11, VSB 14

    https://infrastructure.gov.au/roads/...ov_2015_v4.pdf

    This states the following mods are allowed without engineering; MC classification vehicles may have up to 50mm greater overall nominal diameter wheels + tyres (section 4.2.4) and because it has ESC, no more than 50mm overall lift (section 2.6).

    Do I understand this correctly?

    First choice replacement tyre: Bridgestone D697 LT 265/70r17 28mm greater diameter = 14mm lift

    Second choice replacement tyre: Bridgestone D697 LT 275/65r17 14mm greater diameter = 7mm lift

    Id like to go with the LT265/70r17 and add a small lift. There is some conflicting advice in the forums. Whether a tyre rubs or fits under the spare wheel cover seems to be specific to the brand and model. So, does anyone have experience with these specific tyres?

    - do they rub at all, including full lock and articulation? Without a lift, with a lift? I have read that the 265/7r17 can rub on the mudguard and UCA but Im not clear on whether this is with or without a lift.

    - do they fit under the cover? What if the pressure is reduced?

    And so the lift; most adverts, articles and forum threads are for 2 (50mm) lifts. Is it possible to get smaller lifts in order to stay under the 50mm limit in conjunction with larger tyres? ARB advertised a 30mm lift kit. Do any other brands offer this?

    Remote reservoir shocks sound like a good idea. Is there an opinion on the Dobinsons or the PME BP-51 now? There is a long thread in the Pajero forums that say the Dobinsons MRR are performing really well after a few early problems.

    Finally, can anyone recommend a suspension workshop in Perth, WA?

    Appreciate there are a lot of questions above! Many thanks in advance.

    Mark

  • #2
    Try Barry Curnow in Myaree.
    Not affiliated in any way and I've had great results from here with other cars I have owned. I always get my tyres re-aligned here, especially when brand new.

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    • #3
      I read the rules as 50mm suspension lift and 50mm tyre diameter increase (so 25mm tyre lift). So 75mm raise in total.

      For your usage requirements, remote reservoir shocks are probably overkill. If you spent a lot of your time on gravel and corrugations, then go for it, but for occasional recreational use, I'd just save the money and get good regular shocks and drop your tyre pressures when needed.

      Good tyre choice - I'd also cross shop the Cooper AT3 just to compare pricing. Be sure to get an LT (Light Truck) version.
      2016 Crystal Pearl Auto VX 2.8, TJM Bar, Safari Snorkel, Cooper AT/3, OME 50mm lift, Dual batts

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      • #4
        Duplicate post by system
        2016 Crystal Pearl Auto VX 2.8, TJM Bar, Safari Snorkel, Cooper AT/3, OME 50mm lift, Dual batts

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        • #5
          Your usage doesn't sound like you need bigger tyres. Bigger tyres will increase fuel consumption and sap some power. I would just go with a lift.
          If you have experienced D4D engine failure, please complete this survey ​http://goo.gl/forms/bpJSYjq0Zx
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          • #6
            Bobcrusader,

            Thanks for the discussion. Here is the text from section 2.6:

            To remain within the scope of VSB14, a vehicle fitted with ESC and modified with a suspension lift up to 50mm beyond the original manufacturer’s standard height can be carried out under the basic modification without certification guidelines as listed in Section 4.

            Vehicle modifications with a suspension lift above 50mm or due to a combination of any other lift (tyres, or body blocks) are required to meet this guideline and Code LS7 or Code LS8 where applicable.


            I think these are the definitive requirements for vehicles with ESC ie 50mm total lift. I would say that the wording could be less ambiguous!

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            • #7
              amts,

              Would an increase to the 165/70 make that much of an increase to the power? I have read conflicting reports. I'm not concerned by the reports of about 1l/100km difference in fuel consumption.

              DO you know if either tyre size would rub or whether they fit under the cover?

              thanks,

              Comment


              • #8
                When going up a size, you don't think there is a loss in power. But you will notice when you go back down in size.

                There shouldn't be any rubbing. As for fitting under the spare cover, it will depend on the tyre model. Not all tyres are made to the same size despite what the numbers on the sidewall says. The tread width varies a lot.
                If you have experienced D4D engine failure, please complete this survey ​http://goo.gl/forms/bpJSYjq0Zx
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