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(Post Link) post #1 of 18 Old 15-03-09 Thread Starter
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turbo noises with induction kit

i have installed a stainless mesh cone filter in place of the std air filter on our 1.9 jtd and the sound is great. really enhances the turbo noises.
when accelerating a nice fluttery noise can be heard. sounds a little like waste gate chatter but that occures during lift off surley.
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Re: turbo noises with induction kit

Nice one Still got that big spoiler on the back?
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Re: turbo noises with induction kit

I had an induction kit on my Fiat at one stage.. I took it off as I wasn't keen on the sucking noise from the turbo.

The wastegate flutter was good though.
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Re: turbo noises with induction kit

I thought waste gates were there to limit boost during acceleration?
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Re: turbo noises with induction kit

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Originally Posted by mave View Post
I thought waste gates were there to limit boost during acceleration?
You are right.

What I meant to say was... I can hear the recirculating dump valve fluttering.
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Re: turbo noises with induction kit

What filter did you go for AV and how much?? Any improvement in power or lag??
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(Post Link) post #7 of 18 Old 17-03-09 Thread Starter
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Re: turbo noises with induction kit

its temp mounted straight on the end of the maf sensor to allow the intercooler pipe to fit. haven't noticed any difference in performance,

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=310119811921
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Re: turbo noises with induction kit

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Originally Posted by symonh View Post
You are right.

What I meant to say was... I can hear the recirculating dump valve fluttering.
I wasn't commenting on your post, I was commenting on the OP because he was implying that wastegate chatter only occurs on lift off. Nevertheless, a good noise
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Re: turbo noises with induction kit

wastegate chatter isn't technically the right phrase. thats just what is refered to. i was using it as an example of the noise.

wastegate chatter is created by cars running high boost with no form of venting it to the atmosphere, ie no dump valve, the boost preasue cannot enter the engine due to the throttle body being closed therefore it backs up to the turbo and then forces its way through the impella. that is what causes the fluttering noise on lift off.
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Re: turbo noises with induction kit

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Originally Posted by AValfaTi View Post
wastegate chatter isn't technically the right phrase. thats just what is refered to. i was using it as an example of the noise.

wastegate chatter is created by cars running high boost with no form of venting it to the atmosphere, ie no dump valve, the boost preasue cannot enter the engine due to the throttle body being closed therefore it backs up to the turbo and then forces its way through the impella. that is what causes the fluttering noise on lift off.
Like a randy Pigeon you mean?

That's compressor stall isn't it?


It sounds nice but will knacker your turbo unless it has been uprated.
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Re: turbo noises with induction kit

wastegates dont make noise, as said above its the air going backwards the the turbo, thats the sound you hear on rally cars, good noise though, i love the sucking noises too, must convince mother to get one
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Re: turbo noises with induction kit

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Originally Posted by Alfa-Red View Post
must convince mother to get one
what a rally car????


and it does cause compressor stall. the noise occurs just before and durring the early few milli seconds of stall
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Re: turbo noises with induction kit

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Originally Posted by Alfa-Red View Post
wastegates dont make noise,
unless you have a screemer pipe,
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Re: turbo noises with induction kit

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and it does cause compressor stall. the noise occurs just before and durring the early few milli seconds of stall
Surely it doesn't cause compressor stall, it is compressor stall?
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Re: turbo noises with induction kit

does it make the idling sound any better? or does it still sound like a tractor? also on pull off, is there more of a "grunt" to it
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Re: turbo noises with induction kit

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Originally Posted by AValfaTi View Post
what a rally car????


and it does cause compressor stall. the noise occurs just before and durring the early few milli seconds of stall
no an induction kit, made her focus sound ok, so im sure the 2.4 will sound great

Wastegate chatter myth

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. 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 15psi 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 FftFftFft not ShuShuShu 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, and or downpipes, and is not harmful.




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Re: turbo noises with induction kit

that will be what i can hear then on acceleration.
as to someones earlier question the car sounds the same as it used to on tick over and it doesn't sound any more grunty under acceleration. just sounds good
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Re: turbo noises with induction kit

You shouldn't get compressor surge/stall on a diesel though, as a Diesel doesn't have a throttle to close and cause air to force back through the turbo..
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