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50/50 haldex mod

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

  1. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 11, 2013]
    I found out there are two types of Haldex ( early and late as normal ) so i will find out which one i get first and the first person to send me one will get the modification bit for free
    #41
  2. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    [Oct 11, 2013]
    Does this apply to performance versions?
    #42
  3. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 11, 2013]
    yes they can be used with them
    #43
  4. chaz20vt
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    chaz20vt Member

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    [Oct 11, 2013]
    Is this mod going to be for sale in the future andrew?
    #44
  5. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 11, 2013]
    Yes that's if some can send me a haldex
    #45
  6. chaz20vt
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    chaz20vt Member

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    [Oct 11, 2013]
    What will this mod actually do?
    #46
  7. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    Read the first page

    Are Haldex systems as standard have a 80/20 ish torque split

    This modification will turn it into a 50/50 split
    #47
  8. chaz20vt
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    chaz20vt Member

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    [Oct 12, 2013]
    Subscribe now
    Can't wait for this to happen
    #48
  9. Sam_
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    Sam_ Down under

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    [Oct 12, 2013]
    #49
  10. superkarl
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    superkarl MAN OF STEEL

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    [Oct 12, 2013]
    The stock system does send 50% to the rear, its just v slow, and rarely does it. Thats what vag publish anyway, all the haldex allow 50/50.
    What would great is permanent 50 split, but system still allows slip for turning etc.
    #50
  11. Sam_
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    Sam_ Down under

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    [Oct 12, 2013]
    The only difference between the orange and blue is that the orange stays engaged under braking and can often result in the groaning during low speed manoeuvres (parking etc). The blue disengages under braking.

    Mines been great. I never get any diff groaning or noises from struggling tyres :)

    This might be a good solution since the aftermarket controller prices have rocketed.
    #51
  12. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    Well I'm going to make these adjustable
    #52
  13. Sam_
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    Sam_ Down under

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    [Oct 12, 2013]
    Surely you'd just want to mimic the behaviour of the blue controller or do you want it under braking too? I'm not sure there's much point adjusting the bias is there? Since you can't transfer more than 50% to the rear?
    #53
  14. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    I might copy the insert first

    50/50 isn't really ideal so i was thinking of making a simple adjust so you can have a 60/40
    #54
  15. Sam_
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    Sam_ Down under

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    [Oct 12, 2013]
    Why is 50/50 not ideal? Obviously more rear would be better. If only it was possible :(
    #55
  16. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    I wouldn't want any more at the rear with the power levels I have
    #56
  17. daz-20vt
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    daz-20vt Well-Known Member

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    [Oct 12, 2013]
    Hi Andrew. Sorry if im being stupid and im missing something. In the first post there is a pin being used. In thread 21 you show a dash dial and in thread 23 its an lcd display yet you say it will be like all of them but half price. Prices on these vary between 130 and 950 euros. Which route is it and is your plan based on the pin idea also. Sorry if im missing something. Sure i probably am. Daz
    #57
  18. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    I will be making the insert as shown on thread 1 then look into the other shown
    #58
  19. daz-20vt
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    daz-20vt Well-Known Member

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    [Oct 12, 2013]
    Ahh ok thanks for clearing it up. Top work!! Really interested in this. My cars going to be used for trck when i finally get it back so a 50 50 split would be awesome i would think.
    #59
  20. phil miller
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    phil miller Member

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    [Oct 12, 2013]
    hmm ive got a haldex 65335 code and have thought mine isnt as it should be, im interested in this out come and will have to do something soon tbh

    good work Andrew
    #60
  21. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    As I said before I just need to borrow a haldex controller.

    There are two types of controller so I may need to borrow two of them so I can it covers them all
    #61
  22. chaz20vt
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    chaz20vt Member

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    [Oct 12, 2013]
    How long would you need one from?
    #62
  23. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    A few months maybe

    any person that lends me the haldex gets the insert free
    #63
    Westy likes this.
  24. chaz20vt
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    chaz20vt Member

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    [Oct 12, 2013]
    What's the price on a second hand one
    #64
  25. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    Ive seen them go for £100+

    I would buy one myself but i don't have the spare cash this few months as more imported things have to be paid for first
    #65
  26. daz-20vt
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    daz-20vt Well-Known Member

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    [Oct 12, 2013]
    So do you need a faulty one or is this just incase your plan doesnt work lol. Could you still use the car without it fitted?
    #66
  27. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    I was after faulty one so i could strip it down without worrying about damaging it

    You would need the Haldex fitted
    #67
  28. superkarl
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    superkarl MAN OF STEEL

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    [Oct 12, 2013]
    the insert would do what the blue controller does and more.
    #68
  29. Sam_
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    Sam_ Down under

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    [Oct 12, 2013]
    According to the table, it'll result in more diff groaning at low speed and leaves the rear engaged under braking and handbrake. That seems to be where the differences end?
    #69
  30. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Oct 12, 2013]
    I'm guessing haldex clutchs will wear out quicker if constantly engaged?
    #70
  31. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Oct 12, 2013]
    That's why I said I would make them adjustable so they could be wound back to standard
    #71
  32. Gops
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    Gops 6th gear @7000rpm

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    [Oct 12, 2013]
    Sorry mate, I've been at work all day! I'm going home now to look for it
    #72
  33. chaz20vt
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    chaz20vt Member

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    [Oct 12, 2013]
    This will be epic if this is possible
    #73
  34. rupe
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    rupe A3 TQS

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    [Oct 12, 2013]
    I've possibly got a spare controller, but does anyone know the actual difference between the supposed non esp and esp controllers?
    Only reason I ask is my controller currently on the car, although working has oil migration through the wires to the rear plug, car is a facelift 2001 with esp, I have another controller but it's off a 2000 TT and am unsure if the TT had esp or not, so am unsure about swapping it out for mine.I guess I could plug it into the car without actually fitting it and if it shows up and I can run the output tests with vcds then it should be ok when fitted and driving?

    sorry to go slightly off topic, but it is sort of related ;)
    Hours of googling and I am none the wiser about esp and non esp controllers, their doesn't seem to be a definitive answer :think:
    #74
  35. Gops
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    Gops 6th gear @7000rpm

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    [Oct 12, 2013]
    Found it! :)

    Attached Files:

    #75
  36. jezzy
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    jezzy Member

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    [Oct 12, 2013]
    I had your problem.
    oil migration to rear plug, it was the pre charge pump, not the controller.
    I could smell the burnt out motor in the pump when i removed from the car, oil leaked into the pump and ruined the motor.
    #76
  37. chaz20vt
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    chaz20vt Member

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    [Oct 12, 2013]
    Let's get it done Andrew :)
    #77
  38. rupe
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    rupe A3 TQS

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    [Oct 12, 2013]
    I did find a failed pump which I have replaced, but surely the oil can't of got from the pump up through the controller and too the plug where it connects to the car? which is the plug I was referring to, sorry for the confusion and sorry for the hijack again.
    #78
  39. superkarl
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    superkarl MAN OF STEEL

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    [Oct 12, 2013]
    if anything it will be the opposite, now, as standard the haldex coupling is constantly working the clutch pack based on so many variables, speed, throttle position, load, wheel spin etc.

    If theyre more locked all it will have to do is open up a little when turning.

    They are a 10plate wet clutch system too, pretty durable. Take more torque than people think. All the haldex drag cars still use stock haldex couplings with 6/7/800lbs torque goimg through them.
    #79
    Westy, s3dave and phil miller like this.
  40. jezzy
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    jezzy Member

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    [Oct 12, 2013]
    Mine has been fine since changing the pre charge pump.(no migrating oil in the plug.
    Yes the oil can migrate through the wires mate.
    quick read here if want to understand. VWVortex.com - Haldex pre-charge pump removal / disassembly PIC HEAVY
    #80

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