Site with BOV noises?

[lismo]

SEQUENTIAL BOV's make the sound your after!!!

I just got a second hand HKS super sequential with R33 adapter for $250

But u can get the MONZA sequential (hks copy) for around $190 new.

[choyda]

This is the sound that Tommi Makkinen's STi made in Best Motoring Vol 19. It has flutter.

[SuAvE-1]

god this is really gay. your all such a bunch of ricers!

just to add to this, i thought it was wastegates that make the 'fluttering' noise. like really slow and lazy sounding.

So?

[grandmasterb]

SEQUENTIAL BOV's make the sound your after!!!

I just got a second hand HKS super sequential with R33 adapter for $250

But u can get the MONZA sequential (hks copy) for around $190 new.

Best place to buy one from and the pro's and cons of a sequential BOV???

[foznice]

for those of you who want the woop woop woop sound, or the flutter... all you have to do is stop your current BOV from opening in the first place. If the throttle plate closes, and all this compressed air has nowhere to go (because the BOV isn't opening) then the air goes backwards through the turbo while the exhaust gases are pushing the turbo forward = Very unhealthy. So the flutter sound is the turbo going backwards and forwards the pressure of the exhaust gases pushing against the compressed intake air.. and the sound comes out the filter, which is even louder and more audible with a POD. When GTST said that there are no BOV's that produce that sound, I think that he meant no BOV that you just install will give the flutter, because the idea of a BOV in the first place is that it vents all the compressed air. The reason why s14's and 15's make this sound is because when boost pressure is increased all the compressed air cannot escape fast enough through the plumback setup, so the air starts going through the turbo.

I reckon flutter sounds cool, but the thought of what it's doing makes me shudder. The gtst I just bought comes with a blitz venting BOV which probably sounds cool, but I might change it with the stock one as the sound of the car definatly insn't a priority for me, and then I can't be done by police.. either that or ill try to hide it or something.

[racsov500]

whoop whoop chirp chirp whooosh iki iki e-waaa waa waa hey bayyybe lol this is crazy :bahaha:

[lismo]

QUOTE: foznice

then the air goes backwards through the turbo while the exhaust gases are pushing the turbo forward = Very unhealthy. So the flutter sound is the turbo going backwards and forwards the pressure of the exhaust gases pushing against the compressed intake air..

I thought the reason the sequential bov makes that noise is because of the opening it comes out of.

Not the air going backwards through the turbo.

[lismo]

The best place and price you can get a HKS super seqeuntial bov (new) is a place called perfectrun. It will be ordered directly from japan. They have an office in sydney so you can pay with aussie dollars. It works out to be about $335 and about $40 for postage.

www.perfectrun.com.au

Or you can buy them for around $250 with adaptor second hand.

There was one going on ebay for $250 with multiple adaptors but no-one bid on it. He sent me an email asking me if i wanted it but i had already got one, so if anyone is interested in it let me know asap.

The monza ones you can get from repco for about $190 and they come with changable settings, like you can have them as a plumb back or a normal sounding bov. But an adaptor will cost you about $55 more.

I just saw the tamko ones on ebay, they look exactly like the hks ssqv and starting bid is $129

The pro's are its good for your turbo

The con's are unless they plumb back they are illegal.

[foznice]

elizabeth, I don't know what the super sequential sounds like, but I always thought that all venting BOV's make a phhhhhhhhtshhhhhhhh sound or something along those lines. The flutter on the other hand, the woop woop woop, chi chi chi, flippy floppy flu, is becuase it goes back through the turbo which is bad. The reason why modr33s2 gets the flutter sound, is because the tightness of the valve is screwed so tight that there isn't enough boost pressure to actually open the valve in the first place and release the air. So the suond isn't actually coming out of the BOV, because it's not venting. Which means that BOV isn't actually doing its job, and you might as well just remove the BOV and block the opening with something as it will give you the same effect.

If you lossen the scew on the BOV you'll hear the phhhhsssssssssh that you hear on the fast and furious lol, which is the BOV venting to the atmosphere (this is when it comes out of the BOV) and allowing the turbo to keep spinning.

I would say that many aftermarket BOV's could be tightened so that the BOV will not vent under x amount of boost pressure.

[someonestolecc]

foznice.

the wup wup wup I'm describing is NOT reverberation.

Which, incidentally is the air bouncing through your cooler pipes.

As for the s14/s15 re-circ valve not being good enough for higher boost I have no idea where this idea comes from. I have run 1.2 1.3 bar with a s15 stockie and it's FINE.

[lismo]

I had a turbosmart veeport type 2 and you could not tighten it enough to not vent or sound like a sequential. I just cant imagine it being able to spin backwards. With a sequential, if that is the case of being too tight, at least some pressure is venting and with what pressure is left i dont think it would ever be enough pressure to spin the wheel backwards. If they harmed the turbo, i dont think they would make them. And just say if it did have the potential to harm the turbo you'd think they would make it semi plumb back for left over pressure.

[R33S2]

My BOV didnt make the flutter until i installed fmic and upped boost I assumed the flutter was the intial venting them the stored pressure from fmic, but it does vent and alot louder now with extra boost. so ( not being argumentive) it does vent as normal just not all the time, only at certain boost pressure, this is what Ive been told by mech.

[foznice]

ok, have a mate whos 33gtst's stocker has been welded shut and he gets the flutter. Vl's don't have a BOV hence they flutter (I think - correct me if im wrong).

Terry: At what particular boost pressure does it vent lower or higher? If the BOV is done up tight, it should vent normally as the boost pressure is high enough to open the valve. Lower boost pressure might not be able to strong enough to open the valve and hence the flutter.

Elizabeth: (without being argumentative) If the valve is too tight, then why would any air vent at all? What I mean is, if the valve is adjusted so that it will only open at a certain boost level, and that boost level is really really high. So say if your turbo isn't compressing to that level, then the BOV shouldn't open in theory? In terms of the backwards turbo thing.. it's called compressor surge, meaning depending on the severity of the boost pressure the turbo will either slow down lots, or start jerking backwards and forwards. Most people agree that it defineatly reduces the performance of your car (spooling times), but people debate often to if it actually damages your turbo as much as people say. I've also heard that it's worse for ball bearing turbos but I don't know why. I also saw in a thread that the supersequential is not to be confused with compressor surge, so perhaps this is the source of confusion.

Someonestolecc: I don't know what GTST was saying about the plubback stockers in s14's and 15's I just assumed that would be the case.

There has been a similar threads to this before I Did a search on flutter and here's two out of quite a few threads: also:http://www.skylinesaustralia.com/forums/sh...ghlight=flutter

http://www.skylinesaustralia.com/forums/sh...ghlight=flutter

[R33S2]

It used to vent whenever I backed of the pedal but at higher boost that was really annoying so I woung the screw in about 3/4 and now it vents at about 3200rpm and above, as I said before the flutter is the extra store of gas in the fmic. b4 it used to vent and stop now it vents and flutters until fmic is empty.

[andy25]

perhaps the case with the sequential BOVs its that it is not the air surging against the turbo or pipes or going through the turbo but rigged for the piston in the BOV to quickly open right up and close slightly (just open enough to not cause a surge) and leting out different amounts of air on release that makes the noise. just a thought im no bov engineer

[foznice]

Terry, I think I understand what you mean now, when the BOV wasn't tight, it didn't take much boost pressure to open the valve, hence it would vent whenever. So the BOV adjustment is loose, it vents the air in the pipes and probably almost all the air in the FMIC as the pressure is still high enough to hold the valve open. When the valve shuts again there air is still probably pressurised, but the remaning air's pressure is not stong enough to cause the turbo to surge (this is all in theory - so maybe not). Now that you tighten the BOV, there is enough boost pressure to open and vent, then as the pressure declines the valve closes. The remaining air in the FMIC however still has enough pressure to cause compressor surge (flutter) hence the flutter until the pressure decreases enough. Would I be right in assume that the you get a flutter under 3200rpm?

andy25... I have no idea. But I assume that they open above a certain pressure only slightly... and a little bit more pressure they will open a bit more, until the valve opens all the way up... but you could be right by all means.

[pentae]

Disclaimer for ricer haters: Not all skyline owners care about the noise their bov makes.

Though with that said, I think the stock gtr bov sounds pretty cool!

[keong]

i had a hks ssqv , it made a little flutter sound but not a lot, on high boost it was more of a whistle sound which gets crazy annoying after a while, hence thats why i sold it !!. I went back to the stock bov and disconnected the small hose that leads in to it and blocked the end of that hose, and now it gets a good long flutter sound which echo's from the pod filter. It will get even louder when i get a fmic

[nemz]

I've got a turbosmart type 2 , to the guy who started this thread, once its tightened as much as you can it splashes, like a hks sequential, then rattles like a 200sx wastegate, i think the second noise is what you heard, they retail for about 400$, depending on how much you plant it, you can get up to 2 cycles, like splash, spalsh rattle, on low revs its only the rattle , i was only on 12 psi when both sounds were achieved...stock boost, with exhaust and pod ( im guessing that forced the boost up), i hope this helps, good luck buddy.

[TTT]

CC - I didn't say the S14 or S15 bov can't handle the boost.

I stated that the PLUMBACK PIPE is not big enough in the stock setup and can't plumback all that air being released. so this CAUSES the 200sx's to make fluttering noises.

If you replace the stock return lines with a larger diameter pipe, then you will hear a whoosh of some sort just like you do.

my example about the rally cars.

I was trying to get the point across that they probably DON'T have bovs.

but with the antilag set up, the fluttering sound is different in between throttle jabs as it would be if a person bought an EVO or sti from the shop and removed the bov.

the truth is that there is no BOV that MAKES a fluttering sound.

however, alot of bovs CAUSE the fluttering sound by being too tight or not being able to flow enough.

all these people going on about HKS SSQV bovs making a fluttering noise.

you think this because it says "SEQUENTIAL" in the name don't you?

and you associate the word "SEQUENTIAL" with "one after the other" and then think this means that it will make some sort of sound "One after the other" like chu chu chu or whatever you want to ***ing call it.

the fact is that the "SEQUENTIAL" is refering to the design.

those bovs actually have 2 pistons/flaps.. apparently to hold more boost.

Same goes for APEXI TWIN CHAMBER BOV. it has 2 chambers, 2 pistons/flaps and still makes a normal psshhhh sound.

what most people do is have the bov too tight and then the bov doesn't open and it CAUSES a fluttering sound between gears.

I don't understand why this is so hard for you all to understand.

boost, throttle shut, air goes bang against throttle body and needs to go somewhere.

if there is a bov, it will open and vent through there to atmo or back to intake if it is plumback.

if there is no bov or the bov is too tight, the air goes back out the way it came. through the turbo, but since it is spinning, it makes a fluttering sound.... just like the sound you hear if you were to blow air on to the BACK of a fan while it is spinning.

if you have an HKS SSQV bov, and it is installed and set up correctly, the sound in between gears or when you back off the throttle, should be a high pitch squeekish type sound.

if after all this, you people still think that BOV's "MAKE" fluttering sounds of some sort, then you really help.

BOV's can "CAUSE" flutter by not oppening.

BOV's can't "MAKE" a fluttering noise if they vent properly. they either open and release one gasp of air or they don't.