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  1. #1
    Low life livin' the high life.

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    Haldex Quattro Controller: Advice Please!!

    Hello all.... I need a little technical advice from you very knowledgeable people:

    I have recently been reading up on replacing the Haldex Quattro controller in my A3 2.0T Quattro S-line. For those of you who don't know (as i understand it - correct me if i'm wrong!!)...
    A3's, TT's and Golf R32's/4motions use the Haldex form of Quattro. This system feeds most of the power (70-80%) to the front wheels (basically to save power/fuel at low speed and when cruising). When the rear wheels begin to slip under cornering or acceleration the Haldex system throws more power to the back wheels.
    This is different to the A4, A5, A6, A8 (and R8?) which employ the Torsen Quattro system. This is a much more pure form of 4WD and has an even distribution of power to front and back wheels at all times.

    SO.... I understand that by simply changing the Haldex unit which comes in an A3 as stock, you can dramatically improve the 4WD performance of the car and make it handle like a 'proper' quattro. The improved Haldex system puts more drive to the rear at all times and throws additional power to the rear much more readily.

    My question is...where's the best place to get an upgraded Haldex unit for an 8P A3? Am i right in saying they're approx 550 - 600 + fitting?
    As you are only replacing the existing Haldex part for a new one, will it affect the warranty on the car??
    Has anyone already done this modification? Are there any potential pit falls i need to watch out for? Obviously tyre wear and fuel economy will suffer but the handling of the car should be superb compared to the stock 4WD setup.

    Any feedback would be most appreciated! Thanks in advance guys.

    Paul.

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  3. #2
    Dreaming of Boost

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    I will start by saying that I have not done this mod yet. I also do not know the best place for you to procure it in Europe, I would imagine there would be quite a few outfitters to choose from.

    As far as warranty is concerned...it is not a factory part but it is OEM. It is generally referred to as the HPP(Haldex Performance Part).

    I have only seen great reviews of this modification. Most believe it absolutely transforms the vehicles they drive.

    The great thing about the Gen2 HPP, which is what we have on our cars, it there is the ability to switch between 3 programs. Stock, sport and race. Each setting makes the differential react a little more aggressively to slip.

    This thread on Fortitude discusses the Gen2 HPP at length. There are quite a few other threads about it. I would imagine more of the MKV R32 people would have done this mod so you may want to check out their forums if you have further questions.
    "Some of us are decent people who want to stay out of the emergency room, but still
    blast through neo-gridlock traffic in residential districts whenever we feel like it....
    For that we need fine Machinery." -Dr. Hunter S. Thompson (1937-2005)

  4. #3
    marriedblonde's Avatar
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    Paul,

    Drop a gent called JaminBen an email via his profile (you can find him posting in here The "RS3" project ) as he has the haldex controller fitted and is apretty clued up chap.

    J.
    Married and blonde yes, but still a guy with a poor taste in usernames!

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  5. #4
    marriedblonde's Avatar
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    and as mentioed above you might want to do a search on www.uk-mkivs.net for the mkiv R32 boys and MK V golf boys to see who done the mod on there.

    J.
    Married and blonde yes, but still a guy with a poor taste in usernames!

    Mercedes Benze E-class 350 sport convertable, black, pacha grey leather, 19" AMG rims, HK stero and a few more toys
    VW Scirocco 2.0Tsi GT with Revo stage 2, evoms induction kit, lowered, short shift, miltek
    BMW 330 Coupe M sport Black, Black leather, Nav and a lot of other options.
    BMW Z4 Coupe Sport in black with a few toys - going friday and gonna be missed by my lad.
    A3 2.0Tdi S-Line DSG. Gone but not forgotten

  6. #5
    Low life livin' the high life.

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    Cheers for that. I did find a few old threads on here discussing it and it seems like a must have purchase if you've got Quattro. Really transforms the A3 from a posh golf to a proper quattro which can't be a bad thing and with it's short wheel base should make the cars handling rock solid.
    I've found websites selling the controller for £550 which doesn't seem too bad.

  7. #6
    Low life livin' the high life.

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    Quote Originally Posted by marriedblonde
    Paul,

    Drop a gent called JaminBen an email via his profile (you can find him posting in here The "RS3" project ) as he has the haldex controller fitted and is apretty clued up chap.

    J.
    Very helpful, thanks for that mate. I'll get onto him and see what he has to say!

 

 

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