Snow Tyre Pressures & Advice





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  1. #1
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    Question Snow Tyre Pressures & Advice

    Hey guys,

    I'm taking my FJ to Lesotho for a week in July, stock standard Dunlop Grandtrek AT22's fitted.

    Depending on the snow/weather conditions I plan on doing Sani pass and some other scenic routes, ending at Afriski. What advice on tyre pressures (tar & gravel) in general snowy conditions would you have?
    Last edited by jarnojvv; 2014/06/09 at 01:28 PM.

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    I'm running the AT22s at the moment on the Isuzu. Unlike the FJ, the Isuzu is in 2wd mode while on tar.

    With the lack of grip I have on wet tar, I really would not take them very far offroad...
    -----------------------------
    Isuzu Frontier 280LX 4x4 2001

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    Quote Originally Posted by RogueFrontier View Post
    I'm running the AT22s at the moment on the Isuzu. Unlike the FJ, the Isuzu is in 2wd mode while on tar.

    With the lack of grip I have on wet tar, I really would not take them very far offroad...
    @RogueFrontier: The FJ is also in 2wd on tar, 4H manually selectable (centre diff locked). Agree with the slipperiness in the wet on tar, weirdly enough they are M+S rated...

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    Quote Originally Posted by jarnojvv View Post
    @RogueFrontier: The FJ is also in 2wd on tar, 4H manually selectable (centre diff locked). Agree with the slipperiness in the wet on tar, weirdly enough they are M+S rated...
    Isnt the FJ permanant 4wd with open centre diff, like the fortuner? 4H then just locks the centre diff?
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    Quote Originally Posted by RogueFrontier View Post
    Isnt the FJ permanant 4wd with open centre diff, like the fortuner? 4H then just locks the centre diff?
    Nope, 2H, 4H & 4L.

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    Quote Originally Posted by jarnojvv View Post
    What advice on tyre pressures (tar & gravel) in general snowy conditions would you have?
    I get to do a lot of snow driving but admit its on fairly ok roads covered in a m+ of hard packed snow. Tyre pressure never under 40psi for me as I run with chains to get grip you need to break the ice layer on the snow. If its not hard packed snow that needs to be crushed for grip go 15psi and remember the lower you go the slower you go.

    Below photo 15psi as you need to float like on sand
    Attached Images Attached Images  
    Last edited by photoguy1510; 2014/07/06 at 09:34 AM.
    GLS triton so far so good 47800km and its still going strong. Only mod egr bypass

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    Quote Originally Posted by RogueFrontier View Post
    Isnt the FJ permanant 4wd with open centre diff, like the fortuner? 4H then just locks the centre diff?
    Off topic.. Does the fortuner have a transfer case or a center diff? In other words does the fortuner have the ability to drive in 4wd on tar?
    Wilhelm

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    Quote Originally Posted by photoguy1510 View Post
    I get to do a lot of snow driving but admit its on fairly ok roads covered in a m+ of hard packed snow. Tyre pressure never under 40psi for me as I run with chains to get grip you need to break the ice layer on the snow. If its not hard packed snow that needs to be crushed for grip go 15psi and remember the lower you go the slower you go.

    Below photo 15psi as you need to float like on sand

    Uhmm... last time I looked: 15psi = 1 bar (100kpa) - right?

    And no pic, yet.
    Edit: Pic ok now, me not ok.
    Last edited by Eggie; 2014/07/06 at 09:45 AM. Reason: found it!
    Eggie.

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    LSD afaik...

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    Quote Originally Posted by wila View Post
    Off topic.. Does the fortuner have a transfer case or a center diff? In other words does the fortuner have the ability to drive in 4wd on tar?
    http://m.toyota.co.za/VehicleFeature...13&ModelID=132

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    I treat snow the same as mud and sand, .8 to 1bar.
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    Quote Originally Posted by wila View Post
    Off topic.. Does the fortuner have a transfer case or a center diff? In other words does the fortuner have the ability to drive in 4wd on tar?
    Fortuner is permanent 4wd with a torsen centre diff that is driver-lockable once you venture offroad.
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    Before you venture into the snow get a set of chains. I guarantee if the snow gets really thick you will be willing to pay 3 time the amount for chains just so you can get home safely.
    Regards
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    Quote Originally Posted by OFFROAD ADDICT View Post
    I treat snow the same as mud and sand, .8 to 1bar.
    Depends on the conditions.

    More often than not you want a really hard tyre to break thru the layer of ice below the snow.

    Even mud and some sand benefit from hard tyres if there is a hardpack surface just below the sand/mud.

    Proper sand like AD is a whole new story, as low as you can go without debeading.
    Cheers

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    Thanks guys...leaving this coming wknd...seen some nice dusting at Sani today!

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    Quote Originally Posted by Eggie View Post
    Uhmm... last time I looked: 15psi = 1 bar (100kpa) - right? And no pic, yet. Edit: Pic ok now, me not ok.
    Umm im going to say yes without checking as thats what i run on sand as well.
    GLS triton so far so good 47800km and its still going strong. Only mod egr bypass

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    Quote Originally Posted by photoguy1510 View Post
    Umm im going to say yes without checking as thats what i run on sand as well.

    Right, close enough, checked & all.

    15psi = 103kpa according to
    http://www.convertunits.com/from/PSI/to/kPa

    Ons arme ouens hier het al vergeet van psi.
    Eggie.

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    Quote Originally Posted by Eggie View Post
    Ons arme ouens hier het al vergeet van psi.
    had to learn all about this psi rubbish to do my work, came to NZ thinking at least its all metric system just to find in refrigeration the lot work in imperial pressure, metric sizing and back into imperial pipe sizing..... Talk about having to bend the brain to work out anything. Its like dealing with land rover, all logic left the building and she be right moved in.
    GLS triton so far so good 47800km and its still going strong. Only mod egr bypass

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