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  1. #1
    Join Date
    Dec 2012
    Location
    cornwall
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    41
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    516

    de dion front upper ball joint

    hi,

    am trying to help another dax guy out with his cobra.

    does anyone know the part number or where to get the dax de dion cc & ar upper ball joint from. I kept all the boxes but cant find this one. other than from Dax

    its the "extra articulation" one over the standard jag.

    cheers
    DAX DE DION

  2. #2
    Join Date
    Sep 2004
    Location
    Netherlands
    Age
    56
    Posts
    121
    You could order these at JK Sports Cars.

  3. #3
    Join Date
    Dec 2009
    Location
    Barton Mills,Bury st Edmunds,Suffolk
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    49
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    286
    I would order from JK Sportscars Ltd you know it will be what you need and save money in the long term, unless you get a specific p/n.
    mark chambers
    Dax de Dion 350 Chevy

  4. #4
    Join Date
    Mar 2006
    Location
    Oxfordshire
    Age
    68
    Posts
    1,642
    Quote Originally Posted by Resik View Post
    You could order these at JK Sports Cars.

    Hi Rocco!

    This thread has reminded me that I have been meaning for some time to give John Kox a call about the upper ball joints. Since I fitted the Corsa EPAS column I have very little self-centering. I have both shims against the front face of the joints for maximum caster, but it seems to me that machining the rear faces down to enable another shim to be inserted in front would provide more caster. I'm wondering whether John has considered doing this, or whether it would interfere with the operation of the CC&AR set-up. I'll make that call...
    Alan

    CRC Thames Valley Regional Rep
    UK Rep for European Cobra Club (eurocobra.boards.net)
    Dax 427 DeDion - Huddart SBC 383

  5. #5
    Join Date
    Dec 2012
    Location
    cornwall
    Age
    41
    Posts
    516
    Many thanks all,

    The self centering is what I am trying to help the guy with, I dont have EPAS, he has and no self centering at all and steering feels awfully "flighty" on the road. Between his build and mine, he didnt build his, the manual has changed with respect to the camber and castor settings (with respect to the position of the 6mm shims on upper ball joint).
    Ive checked his camber and is out (not enough negative) as per the latest edition. I have read some threads on here saying people have put even more negative camber on for EPAS. His castor shims are also on the wrong side of ball joint. I am going to change that over. But he says hes had an after market ball joint fitted at some point. Trawling various jag specialists, they only list one upper ball joint for the whole XJ range through 70's to the last X300 in 1995. I want to keep a spare one for future use, I want to see the difference between the Dax supplied one and a OEM Jaguar ball joint.

    Thanks for replies
    DAX DE DION

  6. #6
    Join Date
    Mar 2006
    Location
    Oxfordshire
    Age
    68
    Posts
    1,642
    I'll be very interested to hear how you get on with that Tristan.

    Quote Originally Posted by kernowcobra78 View Post
    Many thanks all,

    The self centering is what I am trying to help the guy with, I dont have EPAS, he has and no self centering at all and steering feels awfully "flighty" on the road. Between his build and mine, he didnt build his, the manual has changed with respect to the camber and castor settings (with respect to the position of the 6mm shims on upper ball joint).
    Ive checked his camber and is out (not enough negative) as per the latest edition. I have read some threads on here saying people have put even more negative camber on for EPAS. His castor shims are also on the wrong side of ball joint. I am going to change that over. But he says hes had an after market ball joint fitted at some point. Trawling various jag specialists, they only list one upper ball joint for the whole XJ range through 70's to the last X300 in 1995. I want to keep a spare one for future use, I want to see the difference between the Dax supplied one and a OEM Jaguar ball joint.

    Thanks for replies
    Alan

    CRC Thames Valley Regional Rep
    UK Rep for European Cobra Club (eurocobra.boards.net)
    Dax 427 DeDion - Huddart SBC 383

  7. #7
    Join Date
    Dec 2012
    Location
    cornwall
    Age
    41
    Posts
    516
    thanks all. going for it monday to change all settings to current ones as per later manual. plus i am suspect of the EPAS wiring. can anyone tell me as i have not experienced the EPAS, is there a big change in feel between the range of the pot when dialling in feel? its a 0 to 100k pot. thats a wide range but he says there is no feeling of weight on steering at all to notice. will keep you posted of results

    cheers all

  8. #8
    Join Date
    Mar 2006
    Location
    Oxfordshire
    Age
    68
    Posts
    1,642
    Hi Tristan.

    The 100k pot approach is cheap but primitive, and they are prone to give erratic results due mainly to temperature variations. The Corsa B ECU outputs three levels of assistance, based in the original set-up on a square wave input from a speed sensor. The pot electronics simulate this, but I've fitted the Easysteer speed sensitive controller, which I've set up to provide medium assistance at up to 15mph, then low assistance up to 40 mph, then no assistance over 40. The changes in assistance levels are quite subtle though, so they are hard to detect.

    I've also fitted a dash mounted switch that cuts the power to the EPAS ECU should it start to misbehave whilst driving - belt and braces and all that!

    If I were just using the power steering for low speed manoeuvering (e.g. parking, reversing) the benefits of that would be outweighed by the loss of self centering. But I do a lot of driving on mountain roads, and am addicted to hairpin bends - the power steering has made them even more fun, so in my case the EPAS stays! Note that powering off the EPAS doesn't seem to improve the self centering, presumably due to the way the column and motor interoperate.

    Looking forward to your updates!
    Alan

    CRC Thames Valley Regional Rep
    UK Rep for European Cobra Club (eurocobra.boards.net)
    Dax 427 DeDion - Huddart SBC 383

  9. #9
    Join Date
    Dec 2012
    Location
    cornwall
    Age
    41
    Posts
    516
    sitrep for anyone interested. On monday I put both 6mm shims to the front of ball joint for max postive castor. Also set camber for him to latest settings negative 0.75 degrees. we went out today to see how it felt. i followed him after 10 miles or so he said it was feeling heavier on the wheel. and more comfortable. as Alan said we have some investigations into EPAS set up. I am now tempted to put him to negative 1 degree camber and see how that feels for him. keeping in mind potential tyre wear. but was pleasing to hear a postive move forward.

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