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Turbo Chatter

Discussion in 'A3/S3 Forum (8L Chassis)' started by sam4191, Jun 5, 2011.

  1. sam4191
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    sam4191 If In doubt, Flat out!

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    Good idea, cheers welly.
    Another thing I forgot to Put is that when idling and revved to 5k there is no chatter/ flutter noise just the tshh. As when driving hard. Only seems at low revs it chatters. But will try get hold of a standard dv an try that.
    #41
  2. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    But presumably the vacuum has to overcome the spring, which it might not be able to do if theres no pressure (ie boost) on the other side of the diaphragm/piston also acting on the spring?

    Otherwise the DV would just stay open all the time once the engine went under vacuum...
    #42
  3. Prawn
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    Prawn My other car is a MINI!!!!

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    Think about how a piston type valve like the 007P is arranged though, the boost pressure does not act on the base of the piston, but on the side, so no amount of boost pressure is ever going to help it open. it's all done by the vacuum. this is why you can get a flutter as the DV won't open off when backing off gently, as there isn't enough vacuum generated to pull it open.

    I'm fairly sure, that under full closed throttle on overrun, the DV will indeed stay open the whole time, then shut when you reappply the throttle
    #43
  4. Smokey_clark
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    Smokey_clark 12th Gear

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    I only get slight turbo chatter when engine is cold, car is mapped etc and i have the second dv spring up (yellow i think).

    Am i right in thinking the cause of this is not enough vacuum in vacuum chamber to operate dv for first 2-3 mins or could something else be at play such as leak in vac pipes or sticking dv? (hopefully not cracked turbo like earlier post!!)

    Also is this an issue as i obviously don't reach high levels of boost and is only for a couple mins when cold sometimes.
    #44
  5. S3 HODGE
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    S3 HODGE Brown passenger seat.

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    Ive got a couple of standard S3 DV's lying around mate, Ill bring one in on Monday xxxxxxx
    #45
  6. shanejess
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    shanejess Guest

    stop the world i want to get off, id be on anti-depresents if i took in most posts on here, a few of you need to be more optermistic and have a more all round feeling of joy and hapiness no doom and gloom everything ruins your engine mentality, surely the chatter is because everything is open ie large cone not boxed away so you carnt here it. and then again it might be me, permanently happy and positive and nieve.
    #46
  7. sam4191
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    sam4191 If In doubt, Flat out!

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    Cheers Budddyyy!!!!!
    #47
  8. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    too stiff a spring in there perhaps if so
    #48
  9. LiveWire
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    LiveWire S3X

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    I fitted a new Yellow spring to my 007p a few days ago and had the problem of the dump valve not opening enough, I also had some flutter from the turbo so I changed back to the Green spring and all is now ok, no flutter just the 007p doing its job correctly.

    My car is remapped so I thought the Yellow spring would be suitable but I was wrong, it could have been the new yellow spring needed to soften up or bed in but I didnt want to risk it to be honest.
    #49
  10. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    Yup, i agree.

    A Wooshing noise from cone filter/open airbox is fine, chatter is compressor stall, bad for turbos with small shafts like the k04s. That is not my opinion, it's a fact.
    #50
  11. shanejess
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    shanejess Guest

    what is a k04s, or am i nieve.
    #51
  12. Gavin G
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    Gavin G Member

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    These DV's seem like they are just another thing to go wrong in a car, whats the real benefits of having one apart from the tsssh noise?:uhm:
    #52
  13. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    It's a plural K04'ssssss, Ie more than one.
    #53
  14. Westy
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    Westy Double Dark Side! Diesel & 8P

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    The standard bosch dv tends to split it's diaphram on a remapped car where as the 007p is designed to withstand the added pressure.
    #54
  15. [Dave B]
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    [Dave B] Rrrrrrrr-tech

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    My 2penneth -> I ran a standard DV on my old unmapped 1.8t. It died a natural fluttery death at ~100k miles and I hadn't changed it in the 50k I'd owned it so I expect it was the one from factory. I've always run a standard DV on my mapped S3, I replaced it recently whilsy doing some troubleshooting but it turned out the old one was still functioning normally, surprising considering I'd been running it in a car that had a knackered N75, dodgy Jabba map and was boosting to over 26psi on a standard K04....

    Anyway, on my standard N75 I get a lovely woosh when coming off throttle (audible due to TIP/filter) and zero chatter on throttle. I recognise that the 007p is a more robust design but the standard DV isn't THAT bad (assuming it's not split).
    #55
  16. A3 T
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    A3 T Lord Of The Rings

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    Mine sounded a bit like this one before i sorted it

    Last edited by a moderator: Aug 15, 2014
    #56
  17. bazil
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    bazil BOOM BOOM

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    mine dont do that, its woosh's when dumping boost but flutters when pootling about, i'll try and get a vid up soon as i see others with early APY engines saying the same as me.
    #57
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  18. sam4191
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    sam4191 If In doubt, Flat out!

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    #58
  19. superkarl
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    superkarl MAN OF STEEL

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    Wow that really is quite loud. Naaaaaat good
    #59
  20. smurfworth
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    smurfworth Well-Known Member

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    #60
  21. Rosso TT
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    Rosso TT Member

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    #61
  22. Piester
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    Piester Member

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    Without wanting to hijack, I've got the fluttering only on full boost which is completely different from any of those videos.

    The seals in my 007p (yellow spring) look absolutely fine, and I've done the N249 delete. I've also replaced the turbo to charge pipe hose, and the other two hoses at the top of the charge pipe. I've had a bit of flutter before but now that I'm running Bill's TIP, the noise is much more prominant.

    The DV dumps fine every time I lift off, so I'm fairly sure it's ok. Presumably if it's only on boost, then it must either be a leak somewhere or an issue with the turbo? As it's not fluttering on lift of, is it still putting a lot of load on the turbo?

    Cheers
    #62
  23. superkarl
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    superkarl MAN OF STEEL

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    Surge? Is that likely tho on a standard turbo
    #63
  24. LiveWire
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    LiveWire S3X

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    If you still have the Green spring for your 007p, I would change to the Green spring and see if that solves the problem.

    I tried yellow spring on my car but found it to stiff to allow the 007p to work properly, this is just in my experiance tho a lot of people get on fine with the yellow spring. Its worth a try as it only takes a min to change the springs.
    Last edited: Jun 8, 2011
    #64
  25. s3dave
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    s3dave TFSI Hybrid

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    Have you got a sound clip/vid?
    #65
  26. Alex C
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    Alex C Well-Known Member

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    scaremongering, the cheek of it, lol
    #66
  27. bazil
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    bazil BOOM BOOM

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    how does this sound, i set of and change gear at 3000 rpm after light acceleration, when i lift of i hear flutter, i get into second gear and rev hard at full throttle to 5500 rpm and let of and hear the boost being dumped with no flutter.

    i now beleive that the flutter is simply due to there being not enough pressure to open the DV, i'll still need to get a video up but after i do my oil pick up pipe.
    #67
  28. superkarl
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    superkarl MAN OF STEEL

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    Yeh its like there isn't enough vaccum under light driving.
    #68
  29. Piester
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    Piester Member

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    Cheers LiveWire. Just ordered a green spring so will let you all know how I get on. Will also try and get a sound clip if I can tonight.
    #69
  30. smurfworth
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    smurfworth Well-Known Member

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    #70
  31. voorhees
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    voorhees Moderator Staff Member Moderator

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    That video isn't the best,it'd take five minutes to remove it and check it tbh.
    #71
  32. Dane
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    Dane Faster than a V12 Q7

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    Sorry dude I was at work when I read your post and couldn't watch the video, that does sound wrong unfortunately what dv are you currently using? Its generally recommended to swap to a forge 007p, or the like, when getting a remap. Other posts about vacuum leaks should help if that doesn't solve the problem
    #72
  33. ido09s
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    ido09s New Member

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    I would say thats pretty normal. Its all dependant on throttle position and rpm etc

    If your on full throttle and snap the throttle shut the dump valve, or blow off valve (BOV) as we call it in Australia, will fly open and give you the wooshing noise. This is obviously normal

    If your driving around on light throttle the BOV will tend to stay shut and give you the chatter, or flutter, you are hearing. If the BOV was adjustable i would say loosen the spring pressure to allow it to open easier, but being a stock car i doubt this is possible.

    You hear people saying their turbo broke because of this chatter, then you hear stories of people running around with no BOV, which will make the car chatter like absolute crazy, and their turbo is still going strong.

    It seems to be very hit and miss.

    Is it bad for your turbo???? if your running high boost and your hearing it i would say yes, if its only on light throttle with small ammounts of boost i would say you wont have to many issues as it really doesnt take much air to make this noise, especially if you have a short inlet.

    If your hearing it while accelarating its called compressor surge and i would get the car looked at ASAP. This is normally caused by a bodgy mismatched turbo that someone has built or a problem and it should be fixed.
    #73
  34. smurfworth
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    smurfworth Well-Known Member

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    Cheers for the reply, its the standard one. Im new to turbo cars and its been like it ever since i bought it so i dont actually know what they should sound like. I can either buy a new standard one for £30ish or go for a 007p at a cost of £80ish. Depending on what everyone reccomends? Its bad how i like the sound of it now though :whistle2:is the 007p as loud as the standard one?

    Cheers
    #74
  35. superkarl
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    superkarl MAN OF STEEL

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    Itl be the same sound, louder once remapped. Everyone will recommend the forge for reliability, but its your cash...
    #75
  36. sam4191
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    sam4191 If In doubt, Flat out!

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    Right. i know it has taken a while now.

    I managed to try a standard DV today. No different at all. Only chatters whilst cruising, rather than when giving it some.

    Measured the Boost pressure on Liquid on the way home this evening and measured 1010mbar (converted to 14.64psi) 1.01bar so i believe.

    What else could it be? I Dont see that there can be any leaks judging by the pressure.
    #76
  37. bazil
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    bazil BOOM BOOM

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    i got a video made but im having problems uploading it, sounds like you and i have the same thing and mine is a APY aswell, keep an eye out for this thread and i'll do my very best to get the clip uploaded, i beleive its just wastegate flutter.
    #77
  38. bazil
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    bazil BOOM BOOM

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    Right, i taped a mini cam to my strut brace and went for a drive, due to slower cars i couldnt really boot it, around half way a got it opened up a little but its a great recording of how my turbo has sounded for the last 8 years and 70,000 miles in my hands, the car has a total of 100,050 miles on the clock with full Audi service history and no engine fault codes, it has plenty of go and never misses a beat.


    ( please ignore the time and date as ive never set them )
    Last edited by a moderator: Aug 15, 2014
    #78
  39. Piester
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    Piester Member

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    So I've replaced my green spring with a yellow one, and no improvement, it just made an extra whistling sound on boost suggesting perhaps that it was slightly overpowering the spring and leaking air straight form the TIP. I've since changed back to the green spring and the whistling has gone.

    In pulling everything apart however I noticed that the DV was pretty gunked up inside with black greasy grime, as well as the usual red lube. The piston (for want of a better word) wasn't moving particularly freely either which could potentially be the issue?

    Unfortunately my photos came out pretty poorly on my phone but you should get the idea.

    [​IMG]

    [​IMG]

    [​IMG]

    The gack is also fairly evident in the hose that going to from the TIP to the DV . Wierdly it's only in the silicone hose in between the TIP and the DV, and not on the inside of the TIP that it goes over (gunk only clinging on to the silicone).

    Any idea why there's so much black grease in the DV or are they all like that?

    I'm planning on cleaning it up properly. What can I use to re-grease the inside of the DV? I could potentially buy a new one but I want to know what's caused the issue in the first place.
    Last edited: Jun 27, 2011
    #79
  40. steve bain
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    steve bain Member

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    Bazil. Sounds like a fubbared DV to me mate. thats how my old DV sounded before i replaced it.
    #80

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