MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: 18Edition30 on June 12, 2013, 09:58:38 pm
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After fitting my ITG maxogen I can get t to chatter/flutter perfectly by releasing throttle mid boost and blipping throttle again, just wondered if this was bad for the turbo?!
Read somewhere its trapped air going back through the turbo the wrong way or something. Damages the fins and bearings.
And ITG was too loud and sucky so got myself the Volkswagen Racing enclosed kit and its perfect, no suck but still chatters when wanted, also seems to be quicker than with the ITG.
So guys good or harmful for car?
Cheers :happy2:
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Mines does it with twintake at low revs, sounds awesome
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Yeah mines around 2.5k
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Afaik it's air hitting the fans of the turbo and its not great for your turbo. But I'm certainly no mechanic :grin:
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I cant see it being an issue... the same will be happening without the intake, you just cannot hear it!
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no it is not hitting the turbo ,the air that comes to the intake pipe from the DV has that "chatter"ish sound
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I would say its good
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Didn't think an intake will "make" it do that, all it does is amplify the sound
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Didn't think an intake will "make" it do that, all it does is amplify the sound
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I thought it was called "wastegate chatter"? where the wastegate is flapping open and closed?
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Its normal turbo noise that you dont hear with the oe engine cover.
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^^^^^^^^^^^^^^^
What he said! My diesel does it now I've removed the back box!!
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I thought it was called "wastegate chatter"? where the wastegate is flapping open and closed?
That's something different.
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Didn't think an intake will "make" it do that, all it does is amplify the sound
^^ This :happy2:
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So is it turbo or wastegate chatter I'm hearing then? If there different.
An if it always does it then it not harmful right?
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There is confusion in the automotive world about so called "wastegate chatter" or "turbo flutter". A noise created on lifting off the throttle in a turbocharged car, commonly described as a chipmunk or a rattlesnake, is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing, called compressor surge. However, in some cases, i.e. where the throttle plate doesn't open fast enough or is set up to only react to high boost, some chatter will remain. Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed. Most Diesel engines have no use for a blow off valve as they do not have a throttle plate.
The chatter noise is very noticeable on World Rally Cars, where anti-lag is used.
A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15 pounds per square inch (1 bar) and greater depending on the trim and flow rate of the compressor side).
Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFftFft not ShuShuShushu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure. It is commonly heard more clearly and may be more prominent on cars with modified intake silencers, up-pipes, downpipes, or an oversized wastegate incorrectly matched to that specific engine. Also, vehicles using on/off solenoids to control boost can do this under certain conditions. It is not harmful to the engine. Some may claim that it can damage the wastegate, which may be possible under some circumstances, however some vehicles flutter regularly inherently from the factory without any consequence.
Shamelessly stolen from Wikipedia