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M35 Funny Low Power Chirp Sound...

NickM91

By NickM91,
in Four Door Family & Wagoneers

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NickM91 Collaborator

NickM91

Posted
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G'day,

Just a niggle I've had with my stag for sometime now. Maybe one out of every 10 or so low power (not on boost) accelerations, if i ease the throttle relatively quickly, I get a relatively quiet chirp kinda sound. Kind of like a turbo flutter sound, but just one 'chirp'.


Anyone have any ideas what may be causing that and a possible fix?

Will try and get an audio clip, but like I said its relatively infrequent and hard to hear.

On another note, finally ordered a FMIC.... only took a year and a half

Cheers

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https://www.sau.com.au/forums/topic/427504-m35-funny-low-power-chirp-sound/
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NickM91 Collaborator

NickM91

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Yeah still Stock. Checked all the plumbing to the BOV and all looks fine, the problem seems to have worsened, maybe a factor of cold weather. Went up the mountains to the snow and every time i'd let off the throttle a bit to hold speed, like when going over a crest, i'd get turbo flutter, and could just about hold it in flutter if i left the pedal position where it was. Boost and RPM dropped as this happens.


I see you have a Kompact BOV josh, how does that go/ does it do the job? Easy to install?

Jetwreck Grand Master

Jetwreck

Posted
Posted

I just put the turbo smart compac on mine. Made a huge difference. I didn't have any warning or mystery sound that my stock one had shit itself.

There was so much of a difference I had to turn my EBC right down so as not to overboost

Brick Mentor

Brick

Posted
Posted

I just put the turbo smart compac on mine. Made a huge difference. I didn't have any warning or mystery sound that my stock one had shit itself.

There was so much of a difference I had to turn my EBC right down so as not to overboost

Haha thats what I found also. Stock bov really doesn't hold boost that well

Are you getting any flutter sound from yours?

Jetwreck Grand Master

Jetwreck

Posted
Posted

Haha thats what I found also. Stock bov really doesn't hold boost that well

Are you getting any flutter sound from yours?

Lol...yeh but only 5-10 psi. I need to try a couple if different springs.

skyguy3804 Collaborator

skyguy3804

Posted
Posted

Yeh, got the Turbosmart Kompact on mine too.. Dunno about boost pressure, etc. as I don't have a boost gauge in my car yet, but yes it does feel better over the std one.

I do get a fair bit of flutter now when in 'D' just on low boost, but according to Turbosmart, that is ok!!

Gets all the boy racers going when I dose it passed them :laugh:

skyguy3804 Collaborator

skyguy3804

Posted
Posted

Yeh, I have the standard green spring in that comes with the BOV.. before they send out a different spring, they want me to take a quick vid of the flutter on low boost and the sound of it on high boost to give their engineers a listen before they make up their mind of what spring to send out. But yeh you're right Scotty, I probably need a slightly softer spring.

skyguy3804 Collaborator

skyguy3804

Posted
Posted

Yep agreed. Fluttering doesn't really bother me, but yeah might attract some unwanted attention

Yes, totally agree. I told them exact same thing.. their answer is that it's totally legal as it's plumb-back, but I would prefer NO unwanted attention!!

If I use the tiptronic, it doesn't really flutter all that much, just a little in 3rd, 4th. Enough to coast by and get away from that 'unwanted attention' that we're all talking about :whistling:

Will let you know what they send me, either the blue or pink spring. BTW: I have an open airbox via the 'Power Duct' addon which they say could be causing most of the low boost flutter. Maybe one day I'll take it off/close it back up with the standard panel as a test to see if that makes a difference.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

The power duct makes no difference to the noise. If it's fluttering then the compressor is back flowing air, which means the BOV isn't doing it's job well enough. I know at least 4 people have contacted Turbosmart recently for the same reason, I have no idea why they can't sort out a softer spring for you.

Do they realise this isn't an RB?

NickM91 Collaborator

NickM91

Posted
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got my kompact plumb back in this morning and now I have fully sick flutter noise all the time. haven't had a chance to see what it does under high power, but definitely get a lot of flutter at medium to low power. I find it annoying, and am not to keen on any unwanted attention either, so interested to hear how the change of spring goes.

considering putting the stock back in as it was fluttering less haha

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