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How to get that 'flutter'?

gun-r32

By gun-r32,
in Western Australia

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Boostzor Grand Master

Boostzor

Posted
Posted

I think its something along the lines of

"me and ma bros are gunna head down to telopea st to get some tabouly and chek out ma mates new fully sic skyline with tha new fully leather interior, man i got aboused on tha forums todayy man those west aussies dont know nuffin eh bro."

What u guys are missing is that his stock blow off valve is different from all the other stock blow off valves that have been manufactured in the past :thumbsup:

Kaido_RR Grand Master

Kaido_RR

Posted
Posted

how about we all stop the ****ing bullshit and keep on topic ffs,

Rossco, after doing some reasearch on fluttering i have found general its a bad thing, i have a hks sqv bov and it does flutter, general under low speeds. A friend also has a sqv on his s15 and it also flutter under low speeds.

I know for a fact that one jap brand bov does make the fluttering noise, i think it may be blizt but i cant remember.

But before you go and change your bov, think about this for a second; once replacing the bov it will results in your afr going abit rich, and may results in the car becoming abit slower (i will have to dig up the thread but one wa member memtion what affect changing the stock bov had on 1/4mile time etc)

ohh ps. im not sure where stock bov are but i found that the s15 which had the bov just after his plenum (greddy) was able to get abit more flutter noise and before people say they arnt setup right well they are

Starionturbo Mentor

Starionturbo

Posted
Posted

OK.

Every VL where I live does it.

Its easy. Find ur Blow off valve, modded or stock. Pull out the vaccum line hooked to the BOV and put a screw in it to block it off- it must be sealed completetly or there is a vaccum leak. That or run NO blow off valve at all.

Then. Make sure you have a Aftermarket cooler.

Then listen to the masssive CHO CHOC CHOC CHO VL style flutter. Its just common in VLs cos there too poor to fit a BOV/too dumb to put one in.

Its also known as DOSE! Its a favourite with the Chapel Street VL crew round here, u hear them flog it and let go. I must say thought it sounds pretty cool, but

a. its illegal

b. it attracts unwanted attention

c. It scares old people/kids/animals

d. It makes the compressor blades slow down, so not a performance mod

e. the guys that have it act like heros, but there just displaying there ignorance.

My suggestion is, run a aftermarket BOV with a harder tension, you will get a nice crisp flutter at low revs and clean pstchhhhhh at higher. I personally used a turbosmart V Port II on my old skyline and it had a great, non annoying noise.

DCIEVE Mentor

DCIEVE

Posted
Posted

I had massive flutter when the piston in my bov seized (no not a pisstake- the cheaper aus made ones seem to rely on blow by oil to stay lubricated). Recipe is big turbo/boost, no bov and pod. Sounded cool for about 5minutes after which it becomes ****ing annoying. I had around ten people ask me what type of bov I had when I took the shitter to the drags.... simple answer: a broken one!

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Its also known as DOSE! Its a favourite with the Chapel Street VL crew round here, u hear them flog it and let go. I must say thought it sounds pretty cool, but

a. its illegal

d. It makes the compressor blades slow down, so not a performance mod

just on these two.

Dependingf what model car it is legal to have run no BOV

And you only notice the performance side of it in a manual, something to keep in mind... the autos just keep pumping along like most of the VL's here in Mexico :rolleyes:

Starionturbo Mentor

Starionturbo

Posted
Posted

R31Nismoid.

Yes the VLs dont need it so its legal, but this is SAU so for the budding SAU enthusiast that wants it on his skyline, it is illegal.

Excellent point made about the autos, It does seem actually that most of them that have the big flutter are automatic anyway so I suppose it shouldnt affect there straight line performance. Good on them.Hate to be going up some twistys though up a hill when you have to be on/off the throttle. :burnout:

caminperth Grand Master

caminperth

Posted
Posted
']ohh ps. im not sure where stock bov are but i found that the s15 which had the bov just after his plenum (greddy) was able to get abit more flutter noise and before people say they arnt setup right well they are

Just after his plenum? So after his throttle body? Of course he was able to get more flutter noise as it sounds like the setup is completely wrong.

A BOV is there to vent off excess boosted air when the throttle has been closed. If it's on the other side of the throttle it can't vent anything.

ix9 Grand Master

ix9

Posted
Posted
']how about we all stop the ****ing bullshit and keep on topic ffs,

Rossco, after doing some reasearch on fluttering i have found general its a bad thing, i have a hks sqv bov and it does flutter, general under low speeds. A friend also has a sqv on his s15 and it also flutter under low speeds.

I know for a fact that one jap brand bov does make the fluttering noise, i think it may be blizt but i cant remember.

Brand is irrelevant. The actual tightness of the spring is all that matters.

mass_iv Grand Master

mass_iv

Posted
Posted

just go out and buy ur self GReddy type s BOV and tighten the tension screw, it will flutter like a mother F***er, at lowish revs, and at high revs it will just make the PSHHT noise. thats wat ive got on mine and man does it sound crazy!!

Kaido_RR Grand Master

Kaido_RR

Posted
Posted
Just after his plenum? So after his throttle body? Of course he was able to get more flutter noise as it sounds like the setup is completely wrong.

A BOV is there to vent off excess boosted air when the throttle has been closed. If it's on the other side of the throttle it can't vent anything.

this setup is normal in s1x type cars, i have seen it just not in my mates s15 but also in s14

SeriesIIGTST Mentor

SeriesIIGTST

Posted
Posted

The only time my stock BOV "flutters" is when i crank my EBC to about a bar, let it spool up from low revs, then release it before it gets a chance to use the boost (ie, change gears around 4K). It's not the BOV as people have correctly mentioned though rather reverberation through the turbo charger. Not a good thing.

Also, mass_iv is 100% correct, tighten the spring on any aftermarket BOV and it will flutter like a bitch at low revs.

P.S. Mikey, it's not after the plenum/throttle body, ie, not after the air is used, but it is that side of the engine bay on a separate pipe but still part of the pipe that runs to the plenum after the cooler. :P

gun-r32 Collaborator

gun-r32

Posted
  • Author
Posted
do a search mate this topic being covered more than enough times...

lazy asses need to use the search option

I wouldnt call it being lazy.

It's obvioulsy a topic ppl like to discuss (30+ threads in this one alone), regardless of how may times it's been covered.

If it's annoying you that much, dont read it.

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