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50/50 haldex mod

Discussion in 'A3/S3 Forum (8L Chassis)' started by beachbuggy, Jun 26, 2013.

  1. rupe
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    rupe A3 TQS

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    [Oct 12, 2013]
    Ok tbh I haven't checked the plug on the rear diff for signs of oil since changing the pump, but just didn't think it would be able to get through the pump plug on the controller and then through that to the rear. I found that thread when trying to diagnose my fault originally, it's a good thread :thumbsup:
    #81
  2. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Oct 12, 2013]
    A guy on the ASN track sessions today had a fully locked Haldex, he said it wheelhops when he corners at low speed, but it doesn't bother him, as it was what he was after!
    #82
  3. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    [Oct 14, 2013]
    Oh i wish i didnt read threads like this !
    IF you have a problem with the haldex system... What are the symptoms?
    Does it show on VAG COM?
    I have the Blue controller fitted to the car, A stock working one in a box at home and one fitted to a full rear subframe/ diff i bought from a TT that ive decided it "dodgy" just because i dont know its history
    #83
  4. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 14, 2013]
    Take you car onto some grass and see if the rear wheels spin

    and it should show up on vag com
    #84
  5. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    [Oct 14, 2013]
    Oh it will drift ok
    Tried that a few times.
    No vag com faults other than brake position switch bloody things gone again
    #85
  6. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 14, 2013]
    That don't help the haldex so fix that first and see how it feels
    #86
  7. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 15, 2013]
    I have a haldex on the way
    #87
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  8. daz-20vt
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    daz-20vt Well-Known Member

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    [Oct 15, 2013]
    Great news. Fair play to whoever sent it!! Really looking forward to this!
    #88
  9. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 15, 2013]
    You want to thank Gops
    #89
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  10. rhys1210
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    rhys1210 Member

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    [Oct 15, 2013]
    that would be me, i have the race controller which is engaged all the time and is still engaged under braking.
    #90
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  11. Gops
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    Gops 6th gear @7000rpm

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    [Oct 15, 2013]
    Should receive it shortly! :) good thing I kept that! One thing I Want to do is open up the whole haldex! Mine isn't draining oil so ill swap it and dissect the old one!
    #91
  12. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Oct 15, 2013]
    How long have you been running this and how much better is it over standard?
    #92
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  13. rhys1210
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    rhys1210 Member

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    [Oct 15, 2013]
    Since February, unlike the standard and blue upgrade (I did have the normal blue upgrade too) controllers you don't feel the rears kicking in and out, you just feel it push you round the corner as the rears are always engaged. I never liked the feeling of it engaging as it always felt it was later than i wanted it to kick the rears in.

    You can buy this controller from the TT shop if you phone them up, the one on their website is the competition upgrade, i have the race upgrade, both are made by BorgWarner (who own haldex).

    Basically what i have is the hpa competition controller, at the bottom of this page explains it. HPA Motorsports Inc. - Big Brake Kits

    In the UK the 2 upgrades they sell are competition (not toe be confused with hpa competition) and the race (same as hpa competition), these are both the same price.
    #93
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  14. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 15, 2013]
    Anyone have the wiring digram for the Haldex?
    #94
  15. s3dave
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    s3dave TFSI Hybrid Supporter

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  16. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 19, 2013]
    Does anyone have a haldex there not using that has this insert in it

    [​IMG]

    There are two types, I have the other one but not this one
    #96
  17. daz-20vt
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    daz-20vt Well-Known Member

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    [Oct 19, 2013]
    Is there an easier way to tell without stripping it down Andrew?
    #97
  18. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 19, 2013]
    You can get under the car with a mirror and light and have a look on top of the Haldex controller
    #98
  19. superkarl
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    superkarl MAN OF STEEL

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    [Oct 19, 2013]
    Mine are the circlip type. Must be the difference in facelift to pre fl.
    There are also esp and non esp controllers, wonder if thats the physical difference
    #99
  20. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 19, 2013]
    I think the screw types are all preface lift

    My old one was preface lift and was sold to someone with a facelift esp and was told my controller fixed his problem?
  21. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Oct 19, 2013]
    The difference from holding both units side by side is ones uses a metal gasket(per facelift) and one has a rubber seal, between the controller and actual Haldex.
  22. Jason.s
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    Jason.s Active Member

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    [Oct 19, 2013]
    The controller 02D900554C (which is listed under pre and post facelift) superceeded over to 02D900554D anyway so now there is only one. No options on ESP or not too.

    The change over on the MK4 Golf from C to D was in 2003.
    Westy likes this.
  23. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 19, 2013]
    Anyway back to the topic I was asking

    Can anyone lend me the part in the pic above?
  24. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 19, 2013]
    Right guys to start with i'm going to make copies of the of the YHW insert and as soon as one is made i will give it to Gops

    The YHW one give 50/50 right out of the box so i can make ones like that or one that increases torque to the rear but not the full 50/50

    I'm also looking into electronics of the haldex and modifying the hydraulics with electronics to control the flow of the hydraulics to the diff

    Complicated but i do have a few ideas in my head and designing them also
    TDIQ, phil miller, Gops and 7 others like this.
  25. Gops
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    Gops 6th gear @7000rpm

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    [Oct 19, 2013]
    The one joe gave me afterwards was pretty different.. Ill post a pic
  26. Gops
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    Gops 6th gear @7000rpm

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    [Oct 19, 2013]
    The one on the right is the one I sent to Andrew.. The one on the left is the one I put in the car..

    Attached Files:

  27. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Oct 19, 2013]
    So your car has had pre and post controller's fitted in its life gops?
  28. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Oct 19, 2013]
    And a performance one which lives in a bag in my dining room atm! :laugh:
    Westy likes this.
  29. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Oct 19, 2013]
    And whys it in a bag and not on your car sir?
  30. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Oct 19, 2013]
    It's going on very soon, as my current one is broke.
  31. voorhees
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    voorhees Moderator Staff Member Moderator

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    [Oct 19, 2013]
    He keeps lots of parts for his car..not on his car
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  32. chaz20vt
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    chaz20vt Member

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    [Oct 20, 2013]
    When will this be ready for sale?
  33. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 20, 2013]
    The inserts will be soon but it will only be the ones with the cir clip ones first and not the screw in one as i've yet to get hold of one to measure up.

    If i can get numbers i will do group buy on here maybe?
    phil miller likes this.
  34. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Oct 20, 2013]
    Be nice to see some test results from a few cars before everyone goes wading in. I assume Gops will be able to comment shortly once he gets his controller back and onto his car?
  35. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Oct 20, 2013]
    This needs to be switchable between fixed 50/50 and standard, and it will sell loads!
    Pedrosousa likes this.
  36. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 20, 2013]
    Thats something i'm working on but its not as simple as you think
  37. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 20, 2013]
    Now i may have found a way and i'm buzzing now
    jojo, Gops and StaceyS3 like this.
  38. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Oct 20, 2013]
    So the circlips for facelifts?
  39. Andrew@A.L.D
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    Andrew@A.L.D May add NOS to 600+bhp?

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    [Oct 20, 2013]
    No mate. You will need the threaded one
  40. chaz20vt
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    chaz20vt Member

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    [Oct 20, 2013]
    So mines a 1999 s3 so pre facelift so it that cir clip ones

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