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50/50 haldex mod

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

  1. RobinJI

    RobinJI Active Member

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    Haha, yep, I had exactly the same thought and was looking for another transverse set-up that might use a true center diff. I haven't found one yet :(

    Evo - I could only find info on a couple of models, but they seem to be similar to haldex but with the hydraulic pressure fully computer controlled
    Celica GT4 - Viscous coupling
    Volvo 850 - Viscous coupling
    Newer Volvos - Haldex
    etc..

    There's some I've not checked yet though, Pulsar GTiR, Mazda 626 etc..
     
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  3. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Could use the later S3 gear so you can get the uprated haldex with electronic adjustment?
     
  4. Westy

    Westy Well-Known Member

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    I'm loving the brainstorming in here guys. There's going to be a lot of expensive ideas and some cheap ones like the original one. Looking forward to it.
     
  5. Scullies

    Scullies Well-Known Member

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    Thanks for the explaination Robin.

    I had it in my mind that the torsen sat on the prop shaft and tightened up as more torque was delivered. Just watched some youtube videos and now I can see the light!

    So its back to "A4 quattro rear diff in an S3" idea.
    More inspectigating is needed when I go to the scrapyard.

    This is why I thought the torsen was on the shaft - looks that way in this picture

    quattro-torsen-differential_operating_principlex1024x768.jpg

    Audi all wheel drive explained | awd cars, 4x4 vehicles, 4wd trucks, 4motion, quattro, xDrive, SH-AWD, Haldex, Torsen, wiki - How it works


    So all we need is an "acceleration device" from a honda :)

    Honda SH AWD Technical - YouTube



     
    #204 Scullies, Oct 23, 2013
    Last edited: Oct 23, 2013
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  6. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Anyway back to the original idea

    I've made up a model for the adjuster and will be getting two make up, one for Gops and one for myself
     
  7. badger5

    badger5 www.badger5.co.uk
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    you should say you only notice it hopping at low speeds... they will still be doing it at higher speeds clearly..
     
  8. rhys1210

    rhys1210 Member
    Team Dolphin Grey VCDS Map User quattro Audi S3

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    In theory they should never hop as it should be an open diff.

    But for some reason they do. But yes you are right it will hop at higher speeds but you don't notice it.
     
  9. superkarl

    superkarl MAN OF STEEL

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    My thoughts aswell.
     
  10. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    I think the communication channels are different... 8L/Gen 1 will be K-Line and later stuff is canbus I believe...

    <tuffty/>
     
  11. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  12. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    I've made the insert and will send it to anyone that wants to review it, Its the one with the circlip so please make sure you have that one.

    I'm making a adjustable one that Gops will try
     
    #211 Andrew@A.L.D, Oct 25, 2013
    Last edited: Oct 25, 2013
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  13. Gops

    Gops Badger 5 Edition
    VCDS Map User Gold Supporter Audi S3

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    Is that the threaded one or the circlip I'm trying? Or am I banging on the controller I sent over?
     
  14. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Don't worry Gops your trying something different that fits both
     
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  15. chaz20vt

    chaz20vt Member

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    I'd like to try one of these
     
  16. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    The insert or the new thing that Gops is testing
     
  17. Gops

    Gops Badger 5 Edition
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    Ooo! I like this thread.. Every time I look at it, something new happens lol! And I'm testing! Perfect actually as I drive the car EVERYday forth and back. I might try and go on the jungle track at work and test the haldex!
     
  18. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  19. chris99

    chris99 s3 driver

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    That was my thought too

    @Andrew, have you considered in adjusting the split through an Arduino controller? (just came in mind as i've bought one today for another ideea) Adjusting it from inside the car or even have it on a custom "auto mode" that is acting based on throttle pedal position, steering angle, speed, etc is not hard at all. Could have some buttons maybe between the seats (where some of us have the navigation controls) and also an LCD to read the status
    :think:
    Seems like an ideea that makes me wanna study more..

    Anyway I'm very captivated by the discussion as it becomes more and more interesting everytime i come back on forum :) Can't wait to see the results
     
  20. chris99

    chris99 s3 driver

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  21. chaz20vt

    chaz20vt Member

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    I wouldn't mind what gops got :)
     
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  23. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Everyone makes it sounds so simple but to make the above cost money and i can understand why they sell for so much, Its not so simple to make either as the LCD needs coding etc, loom, the stand alone ecu etc etc etc

    Is it the right one for your haldex? there are terms and conditions if i give you this insert
     
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  24. Westy

    Westy Well-Known Member

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    Its so easy mate, hurry up what's taking so long! ;)

    I was thinking its just a shame there's no access panel under the boot carpet to the haldex. That would make life a bit easier.
     
  25. Sam_

    Sam_ Down under

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    It's easy enough to replace it from underneath. I've done mine twice. It's fiddly to get it in and out but it's still a quick job.

    I'd recommend using some string to pull the connector back through over the exhaust (tie some string to the connector end when you remove it, tie it to the new one and pull the string to get it back over). Then hold the gasket to the controller with an elastic band until you get the bolts in for a turn, then cut the elastic band off. Also, make sure you get the gasket on the right way as it can go on two ways of course. Worth ordering a new gasket too. You can reuse the bolts.
     
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  26. Sam_

    Sam_ Down under

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    I forgot to add, you'll loose a dribble of fluid but nothing to worry about. Although it's worth doing a Haldex service while you're under there if you've not done it for a while?
     
  27. s3dave

    s3dave TFSI Hybrid
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    Dont undo the wrong bolt like i did and drained the diff.......:undwech:
     
  28. Sam_

    Sam_ Down under

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    Haha, well it's worth changing that too ;) 1L of GL5 75w90
     
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  29. chris99

    chris99 s3 driver

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    I don't make it sound simple, it is. I am new into this as well, but as I said it's not hard. As the ideea came to my mind while reading the updates from here, felt that I had to share it here, maybe you can benefit from it.

    Of course there is some coding there, but being an open source community, you can easily get code, libraries, help etc. The language is C++, I had some experience with it about 10 years ago, I will try and reintroduce myself in this world. Anyone else with basic programming skills is able to code this microcontroller.

    The price they ask is justified only if they target to sell 2 or 3 pieces and get profit too :)
    Coding a text on LCD is less than 5 min job, then copy/paste for the other units, display is 4$, Arduino is about 18$, modules (shields) 10-25$, sensors about 15$ (temp, pressure or even triple-axis accelerometer), and loom.. lol.. few dollars.

    Excuse me but still don't get why they ask for that price. I got the controller and some extra bits, still waiting for a power supply module and lcd, and I will give it a try first with some sensor readings, then will start brainstorming with a friend on the haldex issue.
     
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  30. Westy

    Westy Well-Known Member

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    All ideas are welcome here. Be great to see your efforts.
     
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  31. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    i hope to see some results with this as all the electronics part of it is over my head

    So is anyone wanting to test the insert I made for free?
     
  32. audiholic ste

    audiholic ste Member

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    I'll test anything for free . What's the terms and conditions .only live in Oldham not too far from Leeds . I'm up for trading one trade for another .(i'm a industrial door engineer)
     
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  33. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  34. audiholic ste

    audiholic ste Member

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    Have I killed this thread .
     
  35. Westy

    Westy Well-Known Member

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    We're waiting for your test results ;)
     
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  36. S3 Paul

    S3 Paul Well-Known Member
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    Everybody is waiting... i bet everybody intrerested keeps checking the page haha
     
  37. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    I'm making the parts right now

    ste is testing the insert and Gops it testing the adjustable mod when made
     
  38. chaz20vt

    chaz20vt Member

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    I'm waiting patiently for it to be tested as i couldn't test myself:(
     
  39. audiholic ste

    audiholic ste Member

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    Hopefully it will be on the car soon been stuck in the big smoke working (hate London love the north ) coming home today maybe tomorrow just got to get the doors interlocking with the gates barriers and access equipment . It's all getting confusing shouldn't have drank so much last night :scared2:
     
  40. S3 Paul

    S3 Paul Well-Known Member
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    If any of the manufacturing is ever a hold up... i offer my services and machines FOC
     
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  41. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Thank you

    ive got it sorted as me and my work mate are machining them are self
     
  42. S3 Paul

    S3 Paul Well-Known Member
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    No problems.
    Just im happy to help with these new ideas, to help keep the cost down for testing
     
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