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Quattro Question

Discussion in 'Audi S4/A4/A4 Cab (B8 Chassis)' started by Jonathaan, Jan 27, 2014.

  1. Jonathaan

    Jonathaan Quattro

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    Hello guys!

    Not ventured into this area before so go easy!

    Basically looking at chopping my A3 in for a 60 plate B8 Saloon. Its the same engine as what i have now apart from it being CR170 to my PD170....

    But it is Quattro, is this the quattro like on S3 where it used a Haldex and only comes into play when front wheels start loosing traction or is it permanent four wheel drive?

    Hope some of you can help me with this,

    Cheers :thumbsup:


    Jonny.
     
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  3. Audi Dynamik

    Audi Dynamik Well-Known Member

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    Im sure its permanent four wheel drive, but somebody should confirm shortly.
     
  4. Audi.Quattro

    Audi.Quattro Active Member

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    The A4 and up, has the perm 4WD with a Torsen centre diff.

    Haldex is used on Golf Mk5 derived vehicles across the group.
     
  5. Anthony566

    Anthony566 Active Member

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    The A4 Quattro is permanent four wheel drive Jonny.
     
  6. Audi Dynamik

    Audi Dynamik Well-Known Member

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    Does anybody know why my car didn't work on a 4wd rolling road and only the rear wheels spun and the front ones did a little ?
     
  7. Jonathaan

    Jonathaan Quattro

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    Splended, thanks chaps!

    Anybody in this section gone down the Tuning route on the 2.0tdi?

    Iv had a search on Google and on this Search, but nothing comes back to ASN?
     
  8. Gazwould

    Gazwould Well-Known Member

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    The 60/40 split.
     
  9. Anthony566

    Anthony566 Active Member

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    " type 3 (Type "C") centre differential, 40:60 'default' split front-rear, automatically apportioning up to 80% of the torque to one axle using a 4:1 high-biased center differential. With the aid of ESP, up to 100% of the torque can be transferred to one axle."


    it could have been this changing the drive to the axle As a reaction to the rolling road maybe ???

    Just a guess....

    Edit ... Pasted the wrong section in Doh!
     
    #8 Anthony566, Jan 27, 2014
    Last edited: Jan 27, 2014
  10. rum4mo

    rum4mo Active Member

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    I think to put it politely, Quattro is only used with longditudinal engine layout, 4Motion is only used with transverse engine layout. Only thing is Audi use 4Motion in transverse installations but rename it Quattro, in the past, and maybe with Amrok and Phaeton, VW use Quattro but rename it 4Motion. All very easy to understand (???) Proper Quattro, as used with B8 A4 upwards probably now has a central differential instead of the old Torsen coupling.
     
  11. viceroy

    viceroy Active Member

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    At a guess, the braking was greater on the rear dyno drums than on the front drums, making the car think the front had lost traction and apportioning more torque to the rear.
     
  12. Audi.Quattro

    Audi.Quattro Active Member

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    I think the centre diff is still a Torsen, just a later incarnation
     
    #11 Audi.Quattro, Jan 28, 2014
    Last edited: Jan 29, 2014
    Daggerit likes this.
  13. rum4mo

    rum4mo Active Member

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    Ah well, less to go wrong judging by my old Passat 4Motion, but, if this is correct (ie still Torsen coupling), why have I not spotted any "loud" warning comments in the user's handbook against running with tyres of varying tread depths? (maybe I have not dug deep enough)
     
  14. Daggerit

    Daggerit Active Member

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    I can only assume it's because there's no clutch to wear out or overheat like in the Haldex systems? The Torsen is fully mechanical, rather than sensor based like the Haldex so I'd guess it wouldn't have any detrimental effects and would just change the basic torque split a bit?
     
  15. rum4mo

    rum4mo Active Member

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    I'm not too sure about that, I'm sure that my B5 Passat 4Motion - ie proper Quattro system, warned about having different "sized" tyres on, ie seriously different tread depth. My old Cav GSI 4X4 had a fluid sort of center coupling and it hated differing tread depths and the issue was over heating the fluid in the coupling.
     
  16. Daggerit

    Daggerit Active Member

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    I can imagine it would have some effect but you can't go changing your tyres whenever your tread gets a bit worn? I have a difference of up to two millimetres between mine but I'm not going to pay for a new set just because of that! Haha.
     
  17. Anthony566

    Anthony566 Active Member

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    When I had my old cavalier 4x4 I was told to swap the wheels front to rear every few months and to keep the tred within 2mm front to rear ....

    I will have to ask Audi about my A4 ......
     
  18. desertstorm

    desertstorm Well-Known Member
    Audi A4

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    If you read the handbook there are warnings about fitting the same size tyres front and rear. It even goes so far as to say that the tyres should be the same make with the same tread pattern as there are small differences in tyre size across manufacturers.
    This to me is a little extreme however I wouldn't want to run something like staggered wheels with different size tyres front and rear even if they were supposedly the same circumference.
    As regards running a Quattro on a dyno I am sure I read somewhere that the rollers should be linked front to rear otherwise this can cause issues with the car.
     

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