Parabolic Leaf Springs.





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  1. #1
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    Default Parabolic Leaf Springs.

    What is your take on the Parabolic leaf springs, specifically for a 70 series.

    The Ausies use them quit a lot and up to now they were not really available to us here in ZA.
    Terrain Tamer has introduced some now for a few vehicle makes and models.

    From what I have gathered:

    It is much lighter than a normal setup.
    Better travel/flex
    Softer ride
    Better for carrying load

    Has anyone here fitted them on a vehicle?

    https://www.youtube.com/watch?v=FT1gKBYOR58

    Toyota Land Cruiser 79 DC V8
    Toyota Hilux 2.8 GD6 4x4
    Toyota RAV-4 2.2 D4D

  2. #2
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    Default Re: Parabolic Leaf Springs.

    EFS has been offering them for a while, also locally. I have no personal experience with them though. We always fit HD kits from TD or Dobinson's on the 79's.
    Walter aka "Meerkat"
    slightly modded 02' 105 series 1FZ-FE
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    My heart beats to an African Bush drum...

  3. #3
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    Default Re: Parabolic Leaf Springs.

    The landrover series guys swear by them if they can afford them. most of the advantages of coil springs without any reengineering.

  4. #4
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    Default Re: Parabolic Leaf Springs.

    I haven't used them on a vehicle but on my boat trailers over the years. No rust in between leaf springs, tows well.
    Bruce Hunter. 2020 FJ Cruiser, 2020 Audi Q5S Tdi, 2019 VW Tiguan 4motion 2.0tsi(work vehicle), 2019 FJ Cruiser, Bush Lapa Kewer 2202, Fusion 17 boat-Yamaha FT100hp 4st.

  5. #5
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    Default Re: Parabolic Leaf Springs.

    I had the exact same question. Started a thread on the subject. Seems in SA its not really an option or very little known about it.

    https://www.4x4community.co.za/forum...59#post4486659

  6. #6
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    Default Re: Parabolic Leaf Springs.

    Chris ask them to give you a set at half price. In return you will do a test report.
    I would also like to know how they perform.

    Think a hard working farm Cruiser will be the ideal test platform.
    It is not what you buy its what you build.

  7. #7
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by grips View Post
    Chris ask them to give you a set at half price. In return you will do a test report.
    I would also like to know how they perform.

    Think a hard working farm Cruiser will be the ideal test platform.
    Nou dit is n smart idea oom Christo

    Toyota Land Cruiser 79 DC V8
    Toyota Hilux 2.8 GD6 4x4
    Toyota RAV-4 2.2 D4D

  8. #8
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by Chris8d View Post
    What is your take on the Parabolic leaf springs, specifically for a 70 series.

    The Ausies use them quit a lot and up to now they were not really available to us here in ZA.
    Terrain Tamer has introduced some now for a few vehicle makes and models.

    From what I have gathered:

    It is much lighter than a normal setup.
    Better travel/flex
    Softer ride
    Better for carrying load

    Has anyone here fitted them on a vehicle?

    https://www.youtube.com/watch?v=FT1gKBYOR58
    I have been looking for some to fit to my 79, but haven't had any luck finding it locally.

    Just to clarify a few things.

    Parabolic leafs taper in towards the ends so that the leafs only touch eachother in the centre of the pack.

    is much lighter than a normal setup.
    This is very dependent on the design, comparing apples to apples, probably not much different.

    Better travel/flex
    This is possible, but depends on the load design

    Softer ride
    This is probably the biggest difference, because the inter-leaf friction is reduced, this enables the spring pack to react to the road surface quicker than a conventional leaf pack.

    Better for carrying load
    This is not true unfortunately. There is no such thing as a free lunch.
    The friction increases in a conventional leaf pack as the load increases, this actually helps the dampers to keep the load stable. This is where the friction is actually favourable.

    A parabolic leaf pack would need to have adjustable shocks (in compression and rebound) to have the same effect when loaded.

  9. #9
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by Cyclone101 View Post
    I have been looking for some to fit to my 79, but haven't had any luck finding it locally.

    Just to clarify a few things.

    Parabolic leafs taper in towards the ends so that the leafs only touch eachother in the centre of the pack.


    This is very dependent on the design, comparing apples to apples, probably not much different.


    This is possible, but depends on the load design


    This is probably the biggest difference, because the inter-leaf friction is reduced, this enables the spring pack to react to the road surface quicker than a conventional leaf pack.


    This is not true unfortunately. There is no such thing as a free lunch.
    The friction increases in a conventional leaf pack as the load increases, this actually helps the dampers to keep the load stable. This is where the friction is actually favourable.

    A parabolic leaf pack would need to have adjustable shocks (in compression and rebound) to have the same effect when loaded.
    This^^

    Parabolic springs used to be known as road friendly springs. The differences are most marked on big springs, aka truck springs. Big truck springs get so hot on fatigue tester water will boil on them, you know when you spit on a surface and it’s so hot the spit bounces, like that.

    Typically they’re made from much higher grade material than the 5160 the normal leaf is made from, hence they’re normally lighter for the same design life. Higher grade steels are even more demanding on process tolerances. Hence your typical spring maker will not have the machinery or more importantly the process to reliably make these. When I was at Supreme Springs we would make a batch of 50 springs just to see if we had the process under control, small spring manufacturers would kill for an order of 50 springs.

  10. #10
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    Default Re: Parabolic Leaf Springs.

    To those that had been wondering about the price.

    Hi Chris,
    The Parabolic Leaf Springs price on the Land Cruiser 79 DC is as follows:

    TLC016EHDP - R10 300.00 x 2 = R20 600.00 Excl. VAT

    However if you take the Full Suspension Kit (SK007) it works out to R30 762.00 Excl. VAT

    I have attached the Specs for you.

    Please contact our Salesmen Nicky or Marinus

    I think that it is reasonable compared to other suspension makes out there.

    Toyota Land Cruiser 79 DC V8
    Toyota Hilux 2.8 GD6 4x4
    Toyota RAV-4 2.2 D4D

  11. #11
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    Default Re: Parabolic Leaf Springs.

    My understanding with Parabolic leaves is that they are more comfortable and do carry a medium load well, but that really heavy loads are still best handled by standard leaves.
    Gavin Pike

  12. #12
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    Default Re: Parabolic Leaf Springs.


    Toyota Land Cruiser 79 DC V8
    Toyota Hilux 2.8 GD6 4x4
    Toyota RAV-4 2.2 D4D

  13. #13
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    Default Re: Parabolic Leaf Springs.

    Hi Guys,

    some info below

    greetings
    fanie

    From: Delicia Van Rooyen [mailto:[email protected]]
    Sent: 27 October 2020 16:20
    To: [email protected]
    Subject: Terrain Tamer Parabolic Leaf Spring - SA4x4 Enquiry

    Hi Fanie,

    Here is a link to our Parabolic Springs:

    https://www.terraintamer.com/en/4wd-...abolic-springs

    You can also go and have a look on our E-Store for more parts we have available.
    You can contact Brian Kibble at Safari Engineering in Windhoek for more info on +26 461 306679.
    Thank you

    No code has to be inserted here.

  14. #14
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    Default Re: Parabolic Leaf Springs.

    Good day

    Please note I am from Terrain Tamer, thus if you have questions please let me know. Contact me at [email protected] or O6O 783 1O13.

    We have done a couple of these installations in South Africa on the parabolic leaf springs. We only supply the parts. The fitment is done by fitment centers.

    Please have a look at these in particular that was shared on Facebook:

    https://web.facebook.com/permalink.p...40629756505930
    https://web.facebook.com/permalink.p...04349294657665

    Here is an Australian reviews on the springs:

    https://www.youtube.com/watch?v=MLBuJlI_S0c&t

    Have a look here as well:

    https://magazine.unsealed4x4.com.au/...abolic-springs
    https://magazine.rvdaily.com.au/rv-d...c_leaf_springs

    These are very new and it is quite an investment if you already have an aftermarket suspension installed. I will try to keep this thread updated with information but feel free to contact us if you are interested.

    In out suspension kit we include the Smart Coils as well:

    https://www.terraintamer.com/en/4wd-...on/smart-coils

    Regards

    Marinus

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  16. #15
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    Default Re: Parabolic Leaf Springs.

    Marinus, please tell us more.

    - Do you need to use adjustable shocks with the parabolic leaf packs?
    - How do they perform on a unladen vehicle compared to a laden vehicle?
    - Is there different constant load set ups, like on OME springs?
    - Is the shocks gas filled, and who manufactures them?

    Thank you.

    Toyota Land Cruiser 79 DC V8
    Toyota Hilux 2.8 GD6 4x4
    Toyota RAV-4 2.2 D4D

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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by Chris8d View Post
    Marinus, please tell us more.

    - Do you need to use adjustable shocks with the parabolic leaf packs?
    - How do they perform on a unladen vehicle compared to a laden vehicle?
    - Is there different constant load set ups, like on OME springs?
    - Is the shocks gas filled, and who manufactures them?

    Thank you.
    No, you don't need adjustable shocks with parabolic leafs, but I said it helps to keep heavy loads stable, and have a softer setup when unladen. But ideally parabolic leaf packs need stiffer shocks compared to a conventional leaf pack.

    Parabolic leafs will have more suspension movement, weather laden or unladen due to less inter leaf friction.
    You still need to spec the load rating for the application. But you can go stiffer with parabolics and lose less comfort compared to a conventional pack.

    Yes, there are different constant load ratings, I have seen 200kg, 300kg, 500kg parabolics.

    I can't comment on the shocks.

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  19. #17
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by Chris8d View Post
    Marinus, please tell us more.

    - Do you need to use adjustable shocks with the parabolic leaf packs?
    - How do they perform on a unladen vehicle compared to a laden vehicle?
    - Is there different constant load set ups, like on OME springs?
    - Is the shocks gas filled, and who manufactures them?

    Thank you.
    Hi Chris

    - As mentioned you do not need adjustable shocks for these springs. Adjustable shocks do have their advantages that I can share if needed.

    - Unladen the springs do drive softer than standard springs due to the interleaf friction that is less than the std springs and the weight of the springs that is lighter than std springs, 40kg vs 63.8kg per pack (700kg rating). That is a saving of 47.6kg when fitting the parabolic compared to std.
    When laden the springs will compress less than the standard springs due to the way the leaves react to compression. There is also a load bearing leaf in the stack that only touches when the vehicle is loaded. There are less interleaf friction than with a standard leaf spring thus it is the misconception that a vehicle will get unstable when laden and traveling at speed, but this is not true. The shock do have to work "harder" due to the inter leaf friction not absorbing the movement, but most 4x4 shocks are designed to do more work and to absorbed the extra energy that is needed with off road conditions. We have never had feedback from clients stating that their vehicles are drifting or feel unstable. The parabolic leaf springs also absorb all the small bumps in the road rather than transmitting these through the chassis to the occupants.

    - We have 300 - 500kg and 500 - 700kg parabolic springs available.

    - All modern shocks are gas filled. It is just some companies that make it sound like it is something only they do. The gas pressure is to prevent cavitation (boiling) of the oil in the shock. Our shocks are manufactured for Terrain Tamer by the same company for the past 20 years. It is a 65mm body with a 20mm shaft and 40mm internal valve cylinder (pressure tube), it is twin tube design.

    Please let me know if you need any other information.

    Regards

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  21. #18
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by Marino4x4 View Post
    Hi Chris

    Please let me know if you need any other information.

    Regards
    How well do they play along with airbags?

    I've got a set of airbags on my 76 and I am planning to keep the bags and fit a set of Terrain tamer parabolics.

  22. #19
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    Default Re: Parabolic Leaf Springs.

    Quote Originally Posted by kenskind View Post
    How well do they play along with airbags?

    I've got a set of airbags on my 76 and I am planning to keep the bags and fit a set of Terrain tamer parabolics.
    On this car it seems to work exceptionally well with airbags.

    https://youtu.be/76vxZPluVqM

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