Grey saucer spheres
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  1. #1
    Member MikeHolt's Avatar
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    Default Grey saucer spheres

    Hi
    there are enough of these oround now on C5/6
    so who is able/ prepared to pressure test them?
    no-one seriously believes they last forever?
    and the behavior of H3 system with a flat sphere is not what has previously been experienced.
    i think rebound damping goes off first.
    Mike

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    Mike Holt
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  2. #2
    Fellow Frogger
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    There are plenty of early C5s out there with 10y+ spheres still doing fine, so they can last a long time. Anyone able to test an LHM sphere could test them, but preferably see someone with a dedicated LDS tester to avoid mixing fluids, which would just be inconvenient rather than a disaster. They do fail, but normally because of an overload (say pothole) where they are designed to fail rather than rupture uncontrollably. You could only regas them if you drill out the rivet and fit the Tecnosir valves in place of the rivet.

    C6 is different to C5 in that the damping is done by the strut and the spheres therefore have no damper. You could run accumulator spheres (i.e. no damper valve) if you get stuck, provided you check/alter the 62 Bar pressure as needed. I know of one C6 that was running around for quite a while using green accumulators at the front while the correct parts were ordered. If you were feeling cheapish ... You could possibly scrounge used stiffness regulator spheres from a dead Hydractive C5, fit the Tecnosir valves and gas them up as desired. It depends how much effort you want to go to versus buying some new spheres.

  3. #3
    Member MikeHolt's Avatar
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    Thanks David S
    that is very interesting
    I see on the C6 forum Pleiades UK are regassing these.
    presumably with an new rivet plug... there are photos there.
    i have a complete set of 7 from I.H.F.S. Delivered to me for 350 sterling.
    they will be fitted next week.
    (i just put their comfort spheres on the XM.)
    i am interested in seeing how flat my old C6 spheres are and if they are worth keeping.
    I just assumed the system on current C5 is the same as on the C6 ?
    it is called Hyhractive 3+.
    I guess the point i am suggesting is that wallowing and rebound clunking over potholes is the symptom of flat spheres with this system different to what happens with earlier hydractive cars that just go hard. I.e. XM/xantia.
    cheers
    Mike
    Mike Holt
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  4. #4
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    Not sure about wallowing, but the clunking could be worn bushes in the bottom of the front uprights and/or the lower control arms, especially the rear bush. Citroen does not supply them separately, but you can buy aftermarket items rather than needing to buy a whole upright or arm. As far as I'm aware, factory control arms are currently not outrageously expensive and the aftermarket bushes for them may be a lucky dip. You'd want to confirm the bush is not undersized and that the aluminium extrusion is the correct one, which it has not always been. The steel subframe C5/C6 use a different mount too.

    350 pounds including delivery sounds attractive deal given the usual cost of freight.

    What has been the change with the XM 'Comfort' spheres? Softer, but less controlled?
    Last edited by David S; 20th September 2014 at 06:50 PM.

  5. #5
    Member MikeHolt's Avatar
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    Not sure the XM comfort spheres are an improvement possibly not.
    very early days.
    less precise perhaps
    but certainly way better than flat spheres.
    lower wishbones on C6 replaced due to noticable knock crossing those small humps in multi level carparks at low speed.
    rubber mounted centre bush completely shot.
    sure there may be other faults too.
    pitching/wallowing and general jitters we will await new spheres.
    suspension is clearly "topping out" usually due to lack of rebound damping and or increased "spring rate" (flat spheres).
    (i know what this is from motocross)
    So perhaps the damping struts are less effective in compression and rebound when corner spheres are flat.
    And the centre sphere(s) now is doing all the work and is undamped?
    cheers
    Mike
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  6. #6
    Member MikeHolt's Avatar
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    OK so the difference between C6 and C5 is substantial.
    C6 has the AMVAR electronic damping ( developed by Peugeot? )
    the C5 has mechanical dampers in the spheres as usual ? Correct?
    despite both cars described as having Hydractive 3+ They are not the same.
    Mike
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  7. #7
    Member MikeHolt's Avatar
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    For interest. These spheres have been regassed by UK firm Pleiades. Photo from C6 forum.

    i purchased a set of 7 new spheres on line from sphereshop. Very reasonable cost delivery direct from I.H.F.S. Factory in Belgium to Melbourne in 10 days. Paris Motors swapped them over, thanks Joe.
    @ 8 yrs 88k kms C6 now rides like new. Will be very interested to test the old spheres if I can find someone to do this?
    i think there must be many C5/6's out there with poor ride by now.
    cheers
    Mike
    Attached Thumbnails Attached Thumbnails Grey saucer spheres-image.jpg  
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  8. #8
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    Hi Mike, did this also stop the wallowing and knocking?

  9. #9
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    I find my C5 wallows a bit in comparison to the Xantia mainly at speed over certain indications. I thought it must be just how they are, maybe I'm wrong! Had no idea they behaved differently as they go flat, so thanks for the info. The rear bushes on my lower control arms are looking tired too.
    06 Citroen C5 Estate 2.2 Hdi Auto
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    95 Silver Xantia VSX - now deceased

  10. #10
    Member MikeHolt's Avatar
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    Quote Originally Posted by garethb View Post
    Hi Mike, did this also stop the wallowing and knocking?
    Yes it did
    but this applies to C6 only.
    C5 will be different.
    the damping is fixed on C5.
    Mike Holt
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