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Craziest Flutter Noise

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SKY031 Grand Master

SKY031

Posted
Posted
most flutters i hear pitch up

Interesting, I thought it would be physically impossible for flutter to pitch 'up'.

Got any examples?

I'd be ultra keen to hear any flutter 'pitch up'.

* takes away andru's thread making privileges

please.

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GTR_VSpecII Explorer

GTR_VSpecII

Posted
Posted (edited)
Exhaust wheels (Turbine wheels) do not have nuts.

They are fused to the shaft, And the compressor wheel is reverse thread.

Its more likely to sheer the shaft and snap it in half which i have seen :wave:

Compressor wheel is what I ment, yes.

Here is a pic of a spear turbo for my boat.

Jason.

post-4149-1159777334.jpg

post-4149-1159777362.jpg

Edited by GTR_VSpecII
SKY 34 Mentor

SKY 34

Posted
Posted

They get the sound by sandblasting the blow off valve with HKS sand

http://www.skylinesaustralia.com/forums/in...howtopic=110974

lol..I thought Bass Junkie was for real..I went...Wuuut the!! + club exec ><

I think the sound is from a closed loop BOV. It isn't an open atmosphere. <<< and no...if you have a plumb back or an atmo BOV installed, once the throttle closes, the excess air between the turbo and the TB is either being plumb to before the turbo or discharged into the air...making no fluttering sound at all.....depending on spring rate/amount of air vented or plumb back

I would imagine having a larger volume intercooler would produce a lounder fluttering noise due to larger volume of air closed off.....I think that is why the HKS GTR has such a loud fluttering noise....

also by having no BOV or bypass valve, as the throttle body opens again, there is a ready supply of air to be sucked into by the vacuum into the plenum...in contrast to having the air dispersed somewhere, requiring the compressor to work quite a duration to re-fill the vented air....so more responsive without the BOV...it will be damaging I suppose but who cares...they have plenty of turbos in stock, the main thing is to impress the press!!

I think the ceramic turbine is only at the exhaust end...if I remember correctly, the intake is made up of sumthing different just to prevent the turbine from smashing to bits "ceramic blasting" the cylinder... the ceramic turbine tends to shoot out of the exhaust if boosted to about 1.0 - 1.2bar..or so I was informed ><....so the ceramic bit will not be affected whatsoever by producing the flutter....

I used to think that the fluttering come from the "sequential BOV" due to it's name "sequential"...it'll be amazing to note how many ppl think along the same line~~... and sad to say I eded up with a HKS sequential BOV

I went ..huh where's the su-to-to-to-to-tooo sound...

and buy those HKS sands...it works magic..my engine is all shiny remember to flush with turtle wax after~~

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