Need a bit of advice i have a 2002 mk4 golf 1.8 turbo with the aum engine my last golf had same egine and it use to have the wicked sound of turbo chatter but i cant remember how i did it to get that so ive tryd fitting a induction filter but still same as with a air filter and box on sometimes i will get the turbo chatter with the standard box on and sometime it wont i need some advice please and many people have said not to fit a dump valve and only a bov dump valve that replaces the standard old black 1 so id be greatfull if someone can help me in the right direction :d
properly interested to see what some experienced or rather qualified dudes have to say about this one. i would have thought that turbo chatter was similar to the impeller cavitation that is best to be avoided with a jetski. fair enough, the lesser density of air would lower stresses i guess but surely it is not a good thing even if it sounds nice???:>@<<<
Dont get me wrong it pulls well but just trying to work out why no engine light comes on just with my old 20vt golf it had turbo chatter all time this 1 i have now only now and again has it but people say its not a good idea to put a dump valve on as these engines due to not dont liking them and do damage and to only replace the old black standard bov ????
the turbo chatter is caused by the diverter valve (bov) not opening correctly this sound is bad for the turbo as when you let off the turbo is still spinning and compressing air but the throttle is shut giving the air no where to go, once the pressure is high enough (fractions of a second) the air will start forcing its way back past the compressor housing stalling the turbo (the noise you get) if you really want it the simplest way is use a stronger spring in an uprated bov but it will kill your turbo sooner or later
yes as carlg says turbo chatter is a bad thing. These engines are designed to run with a diverter valve. When you let off the throttle the diverter valve opens and puts the compressed air back into the intake system helping keep the turbo spooled up for less lag between changes. If you have turbo chatter that means you diverter valve isn't opening as it should. The noise you can hear is air going through the turbo the wrong way causing it to stall. There are 2 kinds of valve, a diverter valve which you should have on you engine, and a dump valve (or Blow off valve). The diverter puts the compressed air back into the intake to reuse and a dump valve just puts it to atmosphere. if you run with your diverter not working youll end up with this sooner or later
My partners 1.8T 3.5 cabrio currently has a baileys atmospheric DV fitted. I get flutter at low revs. Just waiting on a recirculating valve to appear in the classifieds at the right price
Is it though? As long as it's not being confused with compressor surge, which is demonstrably bad, most Turbo specialists I've spoken to over the years have very mixed views on chatter/flutter and whether it adversely affects the running and life-span of a turbo. Whilst the "physics" of the phenomenon might suggest it's bad, any evidence to suggest that it is, seems to be largely circumstantial from what I've read. Whilst it is hard to prove that chatter/flutter is the cause of turbo failure, most tuners I've spoken to seem to be of the opinion that Turbo failure can rarely be definitively put down to excessive stalling over time and is more often due to other components in the system failing or being installed incorrectly. I have no technical knowledge on this and I'm only going on what I've been read and told from reputable sources but from what I know, I don't think you can definitively say that "Turbo chatter is bad". Would like to see if there is any more "scientific" evidence on this as mine chatters on low to mid rev lift off.
Will you now ?? Do not think so, that turbine wheel had MUCH bigger problems then lack of blow off valve You would have to run 3-4+ Bar of boost without blow of valve to worry about turbo damage There are turbos that can withstand this day in day out But on a serious note, turbo chatter caused by compressor stalling may be cool and sound nice but it will not give you any gains in drivability but will cause opposite effect so best avoided
Turbo chatter reduces turbo life by loading up the thrust bearings in the turbo's CHRA. It is not desired by OEs and usually they vent the excess air very close to the compressor output, which tends to help engine response.
Sambo im not sure the k03/k04 is really a good turbo for this sort of abuse they are a really small frame turbo, but I would imagine that the OEM just wanted rid of the noise..... I don't like the idea of my turbo being forced to slow down when I can avoid it
