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Thread: Turbo Chatter

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    sam4191's Avatar
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    Turbo Chatter

    hi guys.

    Been running my car for 4 months now. Since I fitted silicon TIP and Cone filter, have enjoyed the turbo chattering away. Only in the last week have I come to realise (due to reading) that it is probably damaging the turbo. The turbo is only 4 months old (4k miles), so need to sort this.

    The DV that is on it currently looks like a Forge 007 jobbie, but has 'Turbo dynamics' written on it.

    What should I do? Try a new Forge 007?

    Any help greatly appreciated!

    Thanks!


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    Your dump valve might not be working properly, you could check it works and has the right spring or setting on it, or easiest would be to get 007p.

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    Had a Polo GTI in the other day that had this issue... replaced the DV and was still doing it.. checked for fault codes and there seems there was an issue with the operation of the N249 so I ran a bypass and the fault code didn't come back...

    I would scan the ECU for fault codes in the first instance as it maybe that there is another reason why you are getting chatter

    For anyone who is unsure of what this noise is, if you rev the engine (into the 5k region) you should hear a chu chu chu type noise rather than a shusssss type noise as the DV dumps... the chu chu chu noise is compressor stall... this is bad and can destroy the trubo... Bill has some pictures of a customers hybrid K03 turbo that ate itself after an APR DV went bad and he was getting this noise... he only ran the car for a little while before changing to a Forge 007p but it was enough (it seems) to have weakened the turbo into eventually destroying itself... it should be said he uses the car as a track day car but it still shows this is a bad thing to have...

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    Can be split/ leaky pipes from the n75/actuator area

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    The N249 is a total mine field of hose that loves to split.
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    I had a really bad chatter when i fitted my dv30, After a i service the dv it was almost gone but i could still here it a bit.

    It turned out that the hose that goes on top of the DV was getting squashed when i put the engine cover back on.

    After changing the straight fitting on the DV for an elbowed one, the chatter disappeared
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    bazil's Avatar
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    Mine has always had a little wastgate flutter, only at spool up,

    after about 3000rpm it doesn't do it

    it's an APY and totally standard, is this normal?

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    Quote Originally Posted by bazil View Post
    Mine has always had a little wastgate flutter, only at spool up,

    after about 3000rpm it doesn't do it

    it's an APY and totally standard, is this normal?
    There's so many different things that can cause fluttering. Mine was fluttering when cold on boost up, I replaced every hose in the boost circuit and it still did it. Just had my turbo stripped and found the culprit:





    Now this is an extreme case. 9 out of 10 are eithe DV or a split hose somewhere.
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    bazil's Avatar
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    Ah crap, I thought it was normal, it's done it since I got the car in 2003 and never got worse and it's covered 70,000 miles in my ownership,

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    Quote Originally Posted by bazil View Post
    Ah crap, I thought it was normal, it's done it since I got the car in 2003 and never got worse and it's covered 70,000 miles in my ownership,
    Well I'm not trying to sh!t you up but mine has done it since the day I bought the car and it had covered 125K miles. I thought that it was just the turbine blades that were a bit blunt causing the issue but the whole housing turned out to be cracked. The turbo was still bosting to its mapped 21PSI but just wasn't producing the air flow it should have been.
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    Ah. ok. Will check all the hoses tomorrow then, will also order up a 007. Then at least that is ruled out!

    I have bypassed the N249, and all the pipes to that are ok.

    Will check out tomorrow and report back.

    As said... mine also only seems to do it under 3k.

    Thanks for the replies guys!


  13. #12
    shanejess
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    its called scare mongering, if any one has a big open cone and a 007 you will here a chatter on gearchange or letting of throttle when under load, its normal dont worry not stall lol, mine chatters my turbo wont distruct itself or snap a conrod lol.

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    Have had it for donkeys,cars still rapid.....ish

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    Quote Originally Posted by shanejess View Post
    its called scare mongering, if any one has a big open cone and a 007 you will here a chatter on gearchange or letting of throttle when under load, its normal dont worry not stall lol, mine chatters my turbo wont distruct itself or snap a conrod lol.
    Like I said it depends what flutter you have. No scare mongering. My flutter was on boosting up not when letting off, and it only did it when the turbo was cold. I now know that this was because of a massive crack through the wastegate housing which closed when the turbo heated up and the metal expanded.

    The DV diverting its air back into the system should not be a fluttering noise but more of a whoosh.
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    Quote Originally Posted by shanejess View Post
    its called scare mongering, if any one has a big open cone and a 007 you will here a chatter on gearchange or letting of throttle when under load, its normal dont worry not stall lol, mine chatters my turbo wont distruct itself or snap a conrod lol.
    No, no it isn't scare mongering, so kindly refrain from giving out bloody awful advice.

    I've got 007P's, and Jetex cones on both my 1.8T's, and a flutter, is not normal.

    an atmospheric style 'woosh' is normal, and that's the DV venting back into the TIP< which is then heard through the air filter.

    Any 'flutter' heard is due to the DV not opening enough, and is compressor stall.

    Answer me this:

    If the DV opened in a single movement, why would you get a 'flutter' sound from it?

    You wouldn't, you'd get a single air release sound for the duration the valve remained open.

    Flutter is compressor stall, and it'll kill the turbo.

    The only time you might get some flutter is when backing off really slowly, sometimes if you back off slowly, there isnt enough vacuum generated in the inlet to open the DV (if you've got a strong spring in there) fully, so a wave of pressure still goes back to the turbo giving a small flutter, that's not a problem, but a flutter when letting off from full throttle, is bad news.

    Ko3 and ko4 turbos have gay little bearings, and they won't last if you allow them to run like this long term.....
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    Mine never flutters on higher boost or from full throttle, only at low engine speed like upto 3000 rpm,

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    Quote Originally Posted by bazil View Post
    Mine never flutters on higher boost or from full throttle, only at low engine speed like upto 3000 rpm,
    Is it when letting off the throttle or as the turbo is coming on boost?
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  19. #18
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    mine dont flutter either ????
    i have badger tip n k&n cone filter??????

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    bazil's Avatar
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    Quote Originally Posted by Westle View Post
    Is it when letting off the throttle or as the turbo is coming on boost?
    It's always on lift off, never on boost or spool up.

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    Quote Originally Posted by bazil View Post
    It's always on lift off, never on boost or spool up.
    First port of call is to check that the DV isn't sticking.
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  22. #21
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    Quote Originally Posted by bazil View Post
    It's always on lift off, never on boost or spool up.
    Fluttering on boost is normally surge... very much doubt you have that...

    Do you have the std DV or has it been changed for an aftermarket one like a Forge? the std DV's are prone to failure and the diaphragm splits... this will cause fluttering...

    As Prawn has said, you can get a little flutter from partially letting off the throttle (not fully closing the throttle) due to lack of vacuum lifting the DV but this tends to be very minimal...

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    bazil's Avatar
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    Standard DV so I'll check that out, To be honest it's probably it's original.

    I'll also need to plumb in a boost gauge and see what the boost levels are and how it's behaving,

    sorry to the OP if I've hijacked the thread

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    Quote Originally Posted by bazil View Post
    sorry to the OP if I've hijacked the thread
    No worries dude. Its all learning! I need to be clued up on this turbo business, so its all helping


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    Quote Originally Posted by shanejess View Post
    its called scare mongering

    flutter as in chirpy noise like cossies used to make or a woosh?

    chirp/flutter is compressor stalling, and a non-functioning recirc dv = bad news for the turbos lifespan

    exhibit (A) - a hybrid k03 which destroyed itself shortly after its APR DV failed, causing chirpy noises, whilst on high boost on track...



    Remembering the internals of a k03 hybrid are in fact a k04

    Be Carefull.

    Shanejess's advise is as misleading as usual
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    Holy sh1t that's bad? What happens do bearings just give up? Making the shaft and wheels eat themselves?

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    Quote Originally Posted by badger5 View Post

    exhibit (A) - a hybrid k03 which destroyed itself shortly after its APR DV failed, causing chirpy noises, whilst on high boost on track...

    I bet hardly anyone on here checks/services their DV either?!
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    Quote Originally Posted by shanejess View Post
    its called scare mongering, if any one has a big open cone and a 007 you will here a chatter on gearchange or letting of throttle when under load, its normal dont worry not stall lol, mine chatters my turbo wont distruct itself or snap a conrod lol.
    There are so many things I would love to say in response to this post, however I shall refrain due to not wanting to get banned from ASN.
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    Quote Originally Posted by Westle View Post
    I bet hardly anyone on here checks/services their DV either?!
    Not my Bosch one no

  30. #29
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    Quote Originally Posted by Westle View Post
    I bet hardly anyone on here checks/services their DV either?!
    Every service I service the DV as well. Takes 10 mins and is good for piece of mind.

    Guide for it is here as I can't be arsed to type one...

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  31. #30
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    Quote Originally Posted by superkarl View Post
    Holy sh1t that's bad? What happens do bearings just give up? Making the shaft and wheels eat themselves?
    its an extreme example, but one caused by a non-functional DV... DV's were fitted by manufacturers to prevent them from seeing these high surge pressures. Chirpy sounds, although they sound cool, are not in the turbo's best interest.
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    Just checked mine and the top seal is split,the two seals inside are intact though.

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    Quote Originally Posted by voorhees View Post
    Just checked mine and the top seal is split,the two seals inside are intact though.
    What DV is that Jase?
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    Forge 007p but it has the tube on the side rather than top

  35. #34
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    Quote Originally Posted by voorhees View Post
    Forge 007p but it has the tube on the side rather than top
    What seal has split then? Any pics?
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  36. #35
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    A friend of mine had a turbocharged clio, which was fitted with a recirc valve (not sure which, but it was an Audi fitment valve, it may even have been a 710N), and it would chatter but only when the engine was revved at idle or being driven gently. I can only imagine this is because while the turbo would have been spinning, it wouldnt have been creating much in the way of positive boost, and the DV simply didnt open.

    When actually driving the car and generating proper boost, it would dump just fine with the expected woosh, but light throttle pootling around town type driving would cause it to flutter, as would revving the engine up in neutral.

    I know some DV's have different spring ratings, and i suspect that a stiff spring in the DV would stop it opening at low pressures as ive described, and could cause the flutter?

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  37. #36
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    Right. Just been out and removed the dv. Followed the guide that welly Put up and the piston drops a bit when holding the niPple to create vacuum, but doesn't drop completely. There was alot of filing type metal dust in there, so cleaned that out. It has a silver spring. The outside looks just like a forge one, but has AMD turbo dynamics written on it. As far as the vacuum pipes go, they all look pretty good to be honest, though want to renew it all anyway. Can I get away with a forge service kit and new spring, or is it a case of might as well try a 007p?
    Cheers


  38. #37
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    Quote Originally Posted by aragorn View Post
    A friend of mine had a turbocharged clio, which was fitted with a recirc valve (not sure which, but it was an Audi fitment valve, it may even have been a 710N), and it would chatter but only when the engine was revved at idle or being driven gently. I can only imagine this is because while the turbo would have been spinning, it wouldnt have been creating much in the way of positive boost, and the DV simply didnt open.

    When actually driving the car and generating proper boost, it would dump just fine with the expected woosh, but light throttle pootling around town type driving would cause it to flutter, as would revving the engine up in neutral.

    I know some DV's have different spring ratings, and i suspect that a stiff spring in the DV would stop it opening at low pressures as ive described, and could cause the flutter?
    Too stiff a spring will stop it opening, simples. Green is fine for most S3 applications IMO.
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  39. #38
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    Quote Originally Posted by sam4191 View Post
    Right. Just been out and removed the dv. Followed the guide that welly Put up and the piston drops a bit when holding the niPple to create vacuum, but doesn't drop completely. There was alot of filing type metal dust in there, so cleaned that out. It has a silver spring. The outside looks just like a forge one, but has AMD turbo dynamics written on it. As far as the vacuum pipes go, they all look pretty good to be honest, though want to renew it all anyway. Can I get away with a forge service kit and new spring, or is it a case of might as well try a 007p?
    Cheers
    Save yourself some money on testing, buy an OEM one and use that to test. It is a LOT less money and will certainly do the job for testing purposes.
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  40. #39
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    Quote Originally Posted by Westle View Post
    What seal has split then? Any pics?
    no pics,it was the one on the top it was in two,the two in the chamber are okay I've ordered the repair kit

  41. #40
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    Quote Originally Posted by aragorn View Post
    A friend of mine had a turbocharged clio, which was fitted with a recirc valve (not sure which, but it was an Audi fitment valve, it may even have been a 710N), and it would chatter but only when the engine was revved at idle or being driven gently. I can only imagine this is because while the turbo would have been spinning, it wouldnt have been creating much in the way of positive boost, and the DV simply didnt open.

    When actually driving the car and generating proper boost, it would dump just fine with the expected woosh, but light throttle pootling around town type driving would cause it to flutter, as would revving the engine up in neutral.

    I know some DV's have different spring ratings, and i suspect that a stiff spring in the DV would stop it opening at low pressures as ive described, and could cause the flutter?
    vacuum opens a DV not boost
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