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Wastegate flutter?

s3 Hoggy Feb 15, 2010

  1. s3 Hoggy

    s3 Hoggy Whats going on???

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    Hi all,

    I have just had a forge TIP fitted and I seem to have developed a flutter on lift off? am I right in thinking this is very bad? I have a forge 007p recirc valve and it usualy gives me a light woosh sound but now thats completely gone!
    Any help would be fantastic as I'm quite worried at the moment as not sure if this is damaging my turbo?:sadlike:

    Cheers Matt
     
  2. 16Klappe

    16Klappe I <3 Panda's! Supporter

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    I'm not sure if it works in the same way with recirc's as atmospheric (in fact I think it doesn't!) but wastegate flutter basically means that the air is passing back through the turbo and effectively stalls the turbo. So yeah it isn't good!

    Does it happen if you lift off quickly? I'm fairly sure that the main cause of flutter is when the throttle plate snaps back quickly, or if the throttle plate isn't opening quick enough you can get a bit as well.

    It's all down to the throttle plate really, try gently working it up to boost by slowly accelerating in 2nd or third up to about 2 and a half/3K and see if you can hear a bit of chatter on the way up to full boost pressure. Let us know what its doing under those sorts of conditions and we might be able to help :)
     
  3. s3 Hoggy

    s3 Hoggy Whats going on???

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    hello mate thanks for the reply there is no flutter on the way up or on boost only when lifting off? Could it be down to the recirc valve?
     
  4. s3 Hoggy

    s3 Hoggy Whats going on???

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    I'd Just like to add im not driving hard as I have just had a new clutch fitted today also

    Cheers Matt
     
  5. voorhees

    voorhees Moderator Staff Member Moderator DSG

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    I get it and also I know minty has it as well and we are still good
     
  6. s3 Hoggy

    s3 Hoggy Whats going on???

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    Thanks Jase I was hoping for a reassuring comment! the work was all done at APS I phoned them and they seem to think its fine also

    Cheers Matt
     
  7. golf

    golf ***** rent boy VCDS Map User

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    A fluttering sound should never be heard from any of the DV's on a 1.8T.
     
  8. s3gav

    s3gav Member

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    mine does it to has done since i fitted my forge dv over a year ago never had a problem
     
  9. s3 Hoggy

    s3 Hoggy Whats going on???

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    I think I'm going to take my recirc valve off at the weekend and re-fit the original one? might be worth a try to see if theres a problem there, It just seems wierd as its only started today after fitting tip and now lost the boost dump sound?

    Cheers Matt
     
  10. Andrew@A.L.D

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

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  11. s3 Hoggy

    s3 Hoggy Whats going on???

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    I was thinking that but its just the standard spring? would it make this flutter if its not dumping properly?
     
  12. R-Tech-Nick

    R-Tech-Nick Active Member

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    It should not flutter with the green or yellow springs, I would check all the small vac lines, Check the line going to the top of the DV and see if its pulling a vac on idle.

    Nick
     
  13. Andrew@A.L.D

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

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    The valve could be sticking? No or little vacuum to operate the valve?

    Is there any fault codes coming up?

    If the N112 valve is faulty then its may not open the valve?
     
  14. s3 Hoggy

    s3 Hoggy Whats going on???

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    If I were to check this would I just take the pipe off and start the engine an see if its sucking? sorry im not very technical!

    Cheers Matt
     
  15. s3 Hoggy

    s3 Hoggy Whats going on???

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    Woohoo I've just found a split in the small pipe going into the top of my 007p! Would this be causing my problem? It seems it would!

    Matt
     
  16. Matt82

    Matt82 Active Member

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    wastegates do not flutter
     
  17. <tuffty/>

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

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    I would think so... if that pipe is split then the DV won't be working 100% thus not dumping the excess pressure and bringing on the onset of compressor stall which sounds like the noise you are hearing..

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

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

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    Arr no vacuum to open the valve, there you go

    Is it better?

    I had that problem with mine were the previous tightened the clip to tight and split the hose
     
  19. ianysm

    ianysm Active Member

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    Got a pic of this pipe?
     
  20. s3 Hoggy

    s3 Hoggy Whats going on???

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    I'll get it sorted in the morning and I'll report back, thanks to everyone who's helped out!

    Cheers Matt
     
  21. s3 Hoggy

    s3 Hoggy Whats going on???

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    I'll take a pic in morning mate
     
  22. golf

    golf ***** rent boy VCDS Map User

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    If it was, indeed, compressor stall then just have a quick look to see that the turbine hasn't been damaged as the shaft of the KO4's are thin and can't take much abuse.
     
  23. s3 Hoggy

    s3 Hoggy Whats going on???

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    How would I have a quick look? Is there an easy way mate?
     
  24. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    the k04 will be fine.. sustained high boost no DV then yea I would be more worried, but not like you describe.. You wont observe a thing just looking and touching it
     
  25. s3 Hoggy

    s3 Hoggy Whats going on???

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    Cheers Bill
     
  26. s3 Hoggy

    s3 Hoggy Whats going on???

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    Fixed!!!!!!!!!

    Cheers Matt
     
  27. MintyS3

    MintyS3 Works 60% the time, Everytime.

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    My n249 valve broke which caused the fluttering on mine, plumber the dv direct to the inlet manifold and its fine although the dump noise does sound different, almost like a slight stall but not sure...
     
  28. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    whilst were on the subject of VAC etc, My boost gauge only reads -4 to -5 psi of vac. on other turboed cars i have had its more around the -20 mark. i dont have any flutter but when i change gear the needle on my boost gauge flutters down instead of just dropping to -20. Why??
     
  29. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    idle vac having a small leak would reduce your manifold vacuum on idle.
    if you have vagcom have a look at block 032 and see what % lambda adjust is doing on short term (first block)... a higher +ve number is compensating for additional air getting in... aka leaky pipe
    (up to 3-5% is probably ok)
     

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