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idle all over the place

Discussion in 'A4/S4 forum(B5 Chassis)' started by jcb, Jun 1, 2009.

  1. jcb
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    jcb Active Member VCDS Map User

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    [Jun 1, 2009]
    had my clutch done (more on that later) and have just noticed that on start up and dis-engagement of the clutch at lights etc the revs drop to 4-500 then bounce around.

    never had a problem with it before, so unlikely to be a faulty or dirty throttle body.
    did the old TB re alignment thing but it didn't make any difference,

    is it possible I have lost a vaccum hose or something that would do this?
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 1, 2009]
    Ye i'd be checking for vac leaks etc.

    Did they remove the engine or the gearbox?

    Any fault codes showing up?
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  4. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jun 1, 2009]
    Also did you change flywheels? or stay with the DMFW
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  5. Soupie69uk
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    Soupie69uk Owner

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    [Jun 1, 2009]
    Mine sometimes does this when I disconnect the battery.

    After a few miles it always sorts itself out.
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  6. jcb
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    jcb Active Member VCDS Map User

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    [Jun 1, 2009]
    gearbox and battery disconnect involved, its not bad, sure it will settle down with a 6 hr blast down the M1!

    stayed DM as its just a temporary clutch. I PX'd a new stage 4 Southbend for Docurley's used Stage 3 Southbend.

    very nice blend of bite and pedal pressure. barely different to stock when depressing the clutch but it definitely bites harder, especially when trying to pull away up hill in a hurry.

    haven't tried any 4000rpm launches yet!
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  7. billybravo
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    billybravo MODERATOR

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    [Jun 1, 2009]
    the DXD stage 4 and soild flywheel is for winners :)
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  8. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 1, 2009]
    TBH i would just fit a factory stock S4 clutch and a 240mm solid flywheel instead of spending lots of money on fancy uprated things that are going to make the clutch pedal feel like your driving a ford transit.

    Standard S4 unit will go a LONG way on a 1.8T
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  9. jcb
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    jcb Active Member VCDS Map User

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    [Jun 1, 2009]
    stock S4 is a solid hub friction plate designed for use on a Dual Mass bushed flywheel
    stick that on a single mass flywheel and you have no give at all.....that doesn't sound good. especially in a 4WD where the clutch is the only point it can give.

    Soupie has the stage four Southbend and it is not much more effort than the one I just got and is good for around 450ftlbs. the stock clutches just don't live long with that kind of abuse.

    no point leaving it stock if you know its going to have to come out early anyway.
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  10. billybravo
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    billybravo MODERATOR

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    [Jun 2, 2009]
    what Ed said :) i love my DXD :)
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  11. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 2, 2009]
    The photos i've seen of the S4 clutch show it having a sprung centre, just as the standard 1.8T clutch has a sprung centre even though its used with a dual mass...

    I'm also sure the RS4 clutch that siena posted also had a sprung centre.

    Theres NO point keeping a 230mm clutch when your changing the flywheel anyway, as the difference in flywheel cost is null, and the uprated S4 units will take even more torque than the equivalently updated 1.8T item.

    It really is a no brainer, unless of course you have vested interests in selling the 1.8T items...
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  12. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 2, 2009]
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  13. Siena
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    Siena Active Member

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    [Jun 2, 2009]
    Nope, wrong.

    S4 / RS4 have sprung hub friction discs, the only 30V B5's running solid hub friction discs, are the 2,4 / 2,8 models.
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  14. jcb
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    jcb Active Member VCDS Map User

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    [Jun 2, 2009]
    ha ha... touché

    actually the 1.8t item is not sprung. having just pulled one I have seen it just this weekend. unusual to have a double sprung system without a valid reason.

    I agree on the flywheel thing, but then I sell RS4, S4 and 1.8t items as well.

    I am only using the stock flywheel and this 2nd hand clutch to get me through to when my engine build is ready. Then it will be single mass 240mm and stage four Southbend
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  15. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 2, 2009]
    a "stage4" 240mm clutch is surely excessive?

    southbends website list the stage3 S4 unit handling 525lbft, and the stage4 handling 600lbft...

    If those are the torque figures your planning on making then this should be a VERY impressive 1.8T!
    #14
  16. jcb
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    jcb Active Member VCDS Map User

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    [Jun 2, 2009]
    It maybe overkill. but it is a very useable pedal feel and the price is almost the same.
    but I fully expect to be over 450 ft lbs on the 2l block with the 2871 and 630cc file.
    I am just preparing myself for the inevitable boredom that may set in 12 months down the line when I get used to it!
    I can swap a 3071 or 3076 bearing and compressor housing onto the Tial VBand exhaust housing I have with a bit of machining for the slightly larger turbine wheel.
    3076's are posting very big numbers on Tapp/Eurodyne files, just 830/1000cc injectors.

    If it ever gets finished then I hope it is an impressive 1.8t....otherwsie I will be gutted I have wasted so long (and so much)!
    #15

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