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Thread: rocky mountain parabolics

  1. 23rd May 2007, 08:40 PM #1
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    Bisho
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    rocky mountain parabolics

    hey guys

    just some reliability questions fitting parabolics to a SIII series. It seems they will transform the vehicle, tho i am considering them, i am wondering if i really do want to keep the vehicle original or not. But im leaning towards the side that i think they well be a very worthwile investment. But my quesion is, for those of you who have had them. Will this cause undue stress on other components, ie the better than standard articulation and axle movement??? I mean it goes without saying, any modification will provide stress on other components, but im just wondering how reliable these things are and there effects. Also, if doing remote outback touring, i assume parts for them would be very hard to find (tho not much harder than finding actual LR parts eh!!)?

    cheers all!

    bisho
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  2. 23rd May 2007, 09:02 PM #2
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    just do it, you'll love em...

    mine did heaps and never looked like letting go...

    they put way less stress on the vehicle IMHO.
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

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  3. 23rd May 2007, 09:02 PM #3
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    I'm also interested to hear this, including also suceptability to axle wrap.
    Cheers
    Slunnie


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  4. 23rd May 2007, 09:32 PM #4
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    whats axle wrap in your opinion?
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
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  5. 23rd May 2007, 09:41 PM #5
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    Actually, I think the stresses on axles, bearings, chassis and homonids attached to the former are lessened. Ride on paras is better, they have greater 'give' and thus reduce stresses and jarring associated with stiff susspension.
    The only components that could be subjected to greater stress are prop shaft UJs due to greater axle articulation and for the same reason susspension bushes... and if not replaced with longer units, brake hoses.

    I had paras fitted (RMs) to the old Turle and thay are great. Even SWMBO liked the ride

    The set up I have on the 88 is 2L fronts and 3L rears: it is a little hard empty but great when packed up for an extended trip.


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  6. 24th May 2007, 01:40 AM #6
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    I put British Springs Parabolics on my SIII and the improvement to the ride was great. I got 4 leaf rears and 2 leaf fronts.

    The parabolics put a lot more strain on your shock absorbers, so be sure you don't skimp on shocks. I put KONI on the back, but I couldn't get KONI for the front.

    They handled the Simpson Desert really well with a heavy load travelling east-west, but I did break a parabolic spring on the Ernst Giles Rd in Central Australia where there were rough corrugations. Whether shocker fade led to spring failure, or spring failure led to shocker demise I don't know, but for outback touring, I'd say avoid the parabolis unless you're light weight (SWB or no Bullbar kind of light weight). Unfortunately you can't get anything with more than 2 leaves for the front.
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  7. 24th May 2007, 12:50 PM #7
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    Quote Originally Posted by incisor View Post
    whats axle wrap in your opinion?
    When the axle is loaded up and the drive torque twists the axle/spring, especially from bouncing etc.
    Cheers
    Slunnie


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  8. 24th May 2007, 12:57 PM #8
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    Quote Originally Posted by Slunnie View Post
    When the axle is loaded up and the drive torque twists the axle/spring, especially from bouncing etc.
    never had the problem with mine that i noticed.... :P
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
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    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
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  9. 24th May 2007, 01:08 PM #9
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    Quote Originally Posted by Slunnie View Post
    When the axle is loaded up and the drive torque twists the axle/spring, especially from bouncing etc.
    Axle wrap is a big problem in many 4x4s - especially those with soft springs and powerful engines/low gearing. As Slunnie says, this is cause by torque trying to rotate the axle, rather than move the vehicle. The spring bends into a "S" shape.

    A mate of mine was the OZ agent for RM parabolics - before he went OS and sold the rights to FWD in Brisbane. So I have seen lots of sets of RM paras in action offroad.

    IME axle wrap is not a problem at all, because the individual leaves are actually very thick - these type of springs get their ride softness from low/no interleaf friction, not from a low spring rate. Axle wrap may be a problem if you fitted the 2-leaf rears to something heavy/powerful though...

    I get some axle wrap with my custom semi-elliptic springs (only 5 leaves) - but it hasn't affected the life of the leaves.
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  10. 24th May 2007, 01:38 PM #10
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    Just do it. We had them on our Stage 1 and they went many places outback with usual touring load and with camper in tow, and performed admirably. Shackle bushes are larger than standard, so if you're worried about these, take spares.
    Numpty

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