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Thread: 40" jeep

  1. #21
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    Default Re: 40" jeep

    A little bit off topic, (off road at least) but there is a lot of suv's that claims more nmt than that. How does their drivetrains cope with it or are they just build stronger than bakkies ?

  2. #22
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    Default Re: 40" jeep

    Quote Originally Posted by Bartho View Post
    A little bit off topic, (off road at least) but there is a lot of suv's that claims more nmt than that. How does their drivetrains cope with it or are they just build stronger than bakkies ?
    They don't run massive 40inch tyres.
    Stu.
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  3. #23
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    Default Re: 40" jeep

    Quote Originally Posted by roadhawg View Post
    They don't run massive 40inch tyres.
    Why ? Because of traction or weight and size of tyre ? If its applying torque to the ground can it be more than what 315/35/20 apply to the tar at full acceleration ?

  4. #24
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    Default Re: 40" jeep

    Quote Originally Posted by Bartho View Post
    Why ? Because of traction or weight and size of tyre ? If its applying torque to the ground can it be more than what 315/35/20 apply to the tar at full acceleration ?
    I think the reason is the insane amount of grip 40" tyres give, there is absolutely no give at the tyre to road surface as with with more normal sized tyres, the diffs truly have to take the full engine torque and for longer intervals.

    The diffs must work right to their potential and beyond, basically the wheels are more powerful than the diffs, with smaller wheels and a powerful engine the wheels will spin when you give them full power, big wheels just laugh and say give me more, the diff becomes the weakest part of the link.
    Last edited by Skylark; 2018/03/26 at 08:23 PM.

  5. #25
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    Default Re: 40" jeep

    Quote Originally Posted by Bartho View Post
    Why ? Because of traction or weight and size of tyre ? If its applying torque to the ground can it be more than what 315/35/20 apply to the tar at full acceleration ?

    Have you ever had to lift a 33inch tyre onto a rear tyre carrier?

    Grip + the weight I reckon.
    Stu.
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  6. #26
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    Default Re: 40" jeep

    We don't understand 'grip' or 'friction'. That is the problem. Etc. It is all very difficult. I don't understand it all myself!

    But I do know one lose something along the way with bigger tyres and that is power transferred to the road because turning bigger wheels use more power. There is a trade off.
    Last edited by Chris Stoffel; 2018/03/26 at 03:52 PM.

  7. #27
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    Default Re: 40" jeep

    Quote Originally Posted by Chris Stoffel View Post
    We don't understand 'grip' or 'friction'. That is the problem. Etc. It is all very difficult. I don't understand it all myself!

    But I do know one lose something along the way with bigger tyres and that is power transferred to the road because turning bigger wheels use more power. There is a trade off.

    Or a spinning wheel coming down to the ground and suddenly becoming very stationary, after a rock or an obstacle, a big heavy spinning wheel
    2011 Jeep Grand Cherokee Overland 5.7
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    2010 JKU Rubicon 3.8 V6 on 35's with Synergy 4" Lift Kit with Fox 2.0 Factory Racing Shocks
    2008 JKU Sahara 2.8 CRD 6sp Man on 33's with Full Traction 3"

  8. #28
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    Default Re: 40" jeep

    I was thinking about this again earlier.

    It's torque. a 40inch tyre is basically creating a 20inch lever on a fulcrum (axle centre). So it's taking more and more torque to turn the thing putting more and more stres on the components.
    Stu.
    Current:
    06 Wrangler Sahara. 3.5inch Rubicon Express and Bilstein lift, Metalcloak control arms, 1.25" RC Body Lift, 1" JKS MotorMount Lift, Zone Disconnects, BFG KM2 33's
    NO LOCKER NEEDED!!!
    KTM 1190 Adventure

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  10. #29
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    Default Re: 40" jeep

    Bietjie gespeelClick image for larger version. 

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  11. #30
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    Default Re: 40" jeep

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