FLUTTER sound as BOV

[joe blo]

do u dudes put the afm in the cooler piping. thats wat they do on vls and i think it fixes the backfiring and stuff

[685]

yeh i got 20cm 2.5" stainless steel intake pipe. afm on cooler pipe. its on the turbo pipe, which isnt recommended (as its hot air, and afm reads inaccurately), but i dun see any room on the cold pipe to mount the afm. didn really eliminate backfiring, til i got stand alone engine management.

bov blocked off..got a whole new stainless steel pipe made for it

doses n spools like vl turbo..alright to show off, but the high pitch dose really gets to u after a while..unless u got loud music inside the car

[Keegs]

this thread is a joke, to all the morons obsessed with the fluttering noise, the only real flutter that sounds any good and is the cause of something useful comes from a wastegate, preferably an external one off a big turbo. Otherwise dont bother trying to obtain the noise through other means because it never sounds the same and it never sounds cool, its merely an imitation of wastegate flutter. People talking about thick intercoolers and huge pods giving the best noises rofl...its hilarious. Why would you want a 110mm thick intercooler on a car running a stock turbo that cant possibly flow enough? Oh to get the flutter lol. Sad that this thread only comes from last year, you'd hope its from like 2003 or something when imports were new and people wanted to make them "fulleh sik" with flutter noises.

Edited January 22, 2007 by 33NIZ

[Cubes]

this thread is a joke, to all the morons obsessed with the fluttering noise, the only real flutter that sounds any good and is the cause of something useful comes from a wastegate, preferably an external one off a big turbo.

LMFAO...

erm you are taking the piss aren't you? RE: Real flutter from Wastegates

[Keegs]

LMFAO...

erm you are taking the piss aren't you? RE: Real flutter from Wastegates

erm how so? What exactly do you think a wastegate sounds like when you back off, im not talking about when its open on full boost obviously.

[DaGr81]

from one of HPI movies HKS street drag meeting... all the gtrs had fluttering when backing off its real fast and sounds way better than a bov flutter...but i dont think this was from bovs .. could be other factors...but very lound and fast flutters

but i was also under the impression that any aftermarket bov will flutter at low rpms (or before you hit boost) ? not quite sure... please do advise me

Edited January 22, 2007 by DaGr81

[R31Nismoid]

erm how so? What exactly do you think a wastegate sounds like when you back off, im not talking about when its open on full boost obviously.

Dude, please... do us a favour

www.howstuffworks.com

Go and read, understand, and re-read just for out benefit so you can understand the basic function of car parts

And then read this entire thread as its probably been covered a dozen times.

An external wastegate does not give you flutter.

Regardless of... backing off, on boost, cruising with your homies, having seks with your mrs in the back seat.

External gates have absolutely nothing to do with "flutter".

Dont try and agrue the fact that it does, otherwise ill even link a video of my car and you can hear for yourself that there is no flutter due to a wastegate.

Simple.

[123456]

he was serious

[Cubes]

he was serious

lmao.... I honestly wasn't sure he was...

[r32matt]

Well its been around 4 months since the last time I blocked off my BOV for some fully sick flutter. The last time I did this my car kept stalling and I could always smell fuel so I changed it back. I decided to try it again a few days ago and so far my car has been running really well. I used the old coke can trick and blocked off the Manifold pipe. My car hasnt backfired since and seems to be starting up alot easier. The gear changes also feel alot quicker. If my stock BOV is getting old can it casue the car to backfire and not start properly? Flutter is fully sick, lol

[mark_sudakov]

Is this a flutter:

http://videos.streetfire.net/hottestvideos...51a89deef9d.htm

[Gazee]

QUOTE(R33HVN @ 19 Jan 2007, 01:46 PM)

But flutter on standard skyline ceramic turbo = no go zone unless your looking for an excuse for a bigger turbo.

My 2 c.

Then why didn't mine come with one from factory? (hr31 coupe)

You should give Nissan a call and ask em...

[Cubes]

33NIZ,

Ceffy's were also realeased from factory without a bov, they too ran a ceramic turbo.

As Simon from Nizpro states... The Bov's are there for emission purposes only. Nothing more nothing less.

[tom9999]

this is a quote from http://en.wikipedia.org/wiki/Wastegate

Wastegate chatter myth

The noise is in fact the air compressed by the turbo passing back through the compressor housing of the turbo after having hit the now closed throttle plate.

A blow-off valve (BOV) will usually eliminate this noise, but in some cases, i.e. where it doesn't open fast enough or is setup to only react to high boost, some chatter will remain.

[Cyprus]

Turbo Flutter = Fully Hectic ... remove the BOV and seal the hole up my friends.. it does no damage to anything and that's a promise.. the only reason nissan even use BOV is due to old men not liking the sound when they drive the car.. they didn't put it on there to protect anything but our ears.

[Chris_R33GTSt]

So if i am running close to STD boost on my 33 GTST and want to go for a cruise and get fulleh sik flutter it isnt going to damage my turbo?

[paulr33]

ceramic exhaust or compressor wheel?

bovs i believe came factory on turbo nissans late 80s

so like 89 i think the mainstream run for the bovs

as nissan (probably) found they increased turbo reliability and emissions

[paulr33]

the bov was fitted on factory cars for a reason

take it off or block it if you wish, but its doing some damage

how much i cant say, but its doing some

the service life was changed after bovs were factory fitted

so there is obviously some justification behind it

[123456]

Just out of curiousity how is it possible for air to flow back through the comp wheel? like im guessing it doesn't stop the impeller spinning, but how does it happen, does it flow back through the comp housing and whilst stopping all air slow down the impellor heaps or does it just travel around the impellor or wa? Was trying to figure it out the other day

[Gazee]

Turbo Flutter = Fully Hectic ... remove the BOV and seal the hole up my friends.. it does no damage to anything and that's a promise..

I wish someone said that to me and backed it up with a "i'll highflow your turbo if it blows".

I just wonder how many people its happened to? I changed from a bleed valve to a EBC, put the boost back to where it was and blocked the bov to see how it would sound, then BANG. Both compressor wheel and exh wheel shattered, both wheels were ceramic aswell scared the shit out of me to be honest.