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  1. #1
    NoggyDS3's Avatar
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    Haldex Guide

    I've seen quite a lot of questions/discussion about Haldex and how it works on the forum recently.

    Anyway, i came across a detailed haldex guide in pdf format tonight and thought it would answer a lot of people's questions and would be of interest to those of you who want to find out more about it!

    Here you go!

    http://www.r32oc.com/HALDEX.pdf
    Last edited by NoggyDS3; 14th June 2008 at 10:27. Reason: Title more appropriately named!
    2001 Facelift S3, Custom Code Phase 1, Forge 007p

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  3. #2
    1animal1's Avatar
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    good find mate, very interesting read
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    Wicked666's Avatar
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    awesome link! didn't know it was made up of so many components!

  5. #4
    NoggyDS3's Avatar
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    Cheers guys!

    Yea - it's quite a clever bit of kit!
    2001 Facelift S3, Custom Code Phase 1, Forge 007p

  6. #5
    jojo's Avatar
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    Quote Originally Posted by Wicked666 View Post
    awesome link! didn't know it was made up of so many components!

    Which means great when it works, and expensive when it breaks! It's not so much that it's made of so many components, it just makes use of existing compenents on the car.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
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    Quote Originally Posted by NoggyDS3 View Post
    I've seen quite a lot of questions/discussion about Haldex and how it works on the forum recently.

    Anyway, i came across a detailed haldex guide in pdf format tonight and thought it would answer a lot of people's questions and would be of interest to those of you who want to find out more about it!

    Here you go!

    http://www.r32oc.com/HALDEX.pdf
    Fantastic - thanks!

  8. #7
    666markyboy's Avatar
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    so reading that guide then am i right in thinking that if the handbrake is on... then 4 wheel drive is disengaged ??? so you could click the handbrake 1 or 2 notches to operate the switch and not fully operate the brakes and you would be in 2WD ?? something i need to test

  9. #8
    jojo's Avatar
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    Quote Originally Posted by 666markyboy View Post
    so reading that guide then am i right in thinking that if the handbrake is on... then 4 wheel drive is disengaged ??? so you could click the handbrake 1 or 2 notches to operate the switch and not fully operate the brakes and you would be in 2WD ?? something i need to test
    Yes, I believe this can be done if your car has ESP, cos it doesn't work on my non ESP equipped S3.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



  10. #9
    666markyboy's Avatar
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    well just been out out in my Quattro Sport with no ESP no button on the dash anyway so i presume not ESP pulled handbrake on 1 notch just enough to illuminate the parking light booted it from standing start and lit the tyres no problem... never done that before... knock the handbrake off again and back to mega grip..... interesting never knew that

  11. #10
    1animal1's Avatar
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    thats damn right bizare!! wonder what difference it would make to performance....if any
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    666markyboy's Avatar
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    well to my engineering mind it would make no diff at all, the haldex is normally disengaged under normal circumstances... it monitors wheel speed and throttle position etc but unless it detects something amiss in the grip department it's in 2wd...

    if your giving it some and the wheels start to spin then it starts feeding that lost energy to the rear wheels.... i guess if you think you can feather the clutch in 2wd on an agressive start so as to not quite spin the wheels then maybe you could have a slight advantage in that there are no transmition losses to the rear wheels but i doubt you would beat the computer and Haldex working together , at the end of the day your still lugging round the weight of that 4wd system so you might aswell use it.... interesting stuff though
    Last edited by 666markyboy; 15th June 2008 at 20:36.

  13. #12
    1animal1's Avatar
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    yeah, very interesting.....may be worth keeping this as a sticky....or putting the PDF link onto the sticky with the links on.... christ...it comes up often enough
    Xbox 360 gamer ID : Timffy

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  14. #13
    jojo's Avatar
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    The reason the Haldex disconnects when the handbrake is up, is so that you can lock the rear wheels when the car is in motion... handbrake turn anyone?
    It's also handy for MOT testers doing the brake test on the rollers.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



  15. #14
    NoggyDS3's Avatar
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    Quote Originally Posted by 1animal1 View Post
    yeah, very interesting.....may be worth keeping this as a sticky....or putting the PDF link onto the sticky with the links on.... christ...it comes up often enough

    Yea - happy for it to be a sticky if the mods want to arrange that?!

    Like you say, questions on haldex come up all the time and this guide seems to provide a fair bit of info! I was looking for a guide for ages because there were so many doubts about how it actually worked.

    Really glad i found it now!!
    2001 Facelift S3, Custom Code Phase 1, Forge 007p

  16. #15
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    Really interesting read. thanks for posting this up.
    Totally addicted to boost.

  17. #16
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    Seen it on ukmkivs!
    useful though.

  18. #17
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    Very good read. suprising how much goes into making the car work!!
    2001 Audi S3 l MTM Remap l 252.7bhp 432.4Nm l Forge 007P l ECS Porsche Stage 2v2 Front Brake Set-up l ECS Stage 1 Rear Brake Set-up l 18" RS4 Alloy Wheels


 

 

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