Site with BOV noises?

[nemz]

get up to 2 cycles, like splash, spalsh rattle

oops i mean, splash rattle, splash rattle though the second cycle isnt as heavy

[nemz]

yeah, well that explains when i said 'when you close it up all the way' GTST yuo ams smartly i was going to say everything you did, but i diddnt want to..haha

[TTT]

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,

dear god.

please go to "how stuff works" website and reasearch wastegate

then come back and edit your post

[nemz]

hey GTST, air chopping back through the turbo..is it bad? does it force the turbine to spin the wrong way or anything...like negative boost or what?

[nemz]

why...i dont need to know the ins and out of everything we have people like you to flame us into the light ...

[nemz]

whats the use of asking for help or trying to explain anything when people like this burn you for it...its granted you knw more then others but get off that dais

[nemz]

dear god.

please go to "how stuff works" website and reasearch wastegate

then come back and edit your post

So, if i go to www.howstuffworks.com, that will help me to explain a noise that a BOV makes ? I dont need to know everything about it to try to explain a sound...i wasnt saying, 'it turns what you have into what a 200sx has' i was trying to explain a sound, the best i could have without him hearing it for himself, and it was a post to him, thanks.

[TTT]

I'm not going to go in to wether it is bad or not.

I have my own opinions and that is all.

I can tell you however, that it does not make the compressor spin "BACKWARDS"

it will slow it down, but not stop it or spin it backwards.

the reason I said to search was so that you can find out that wastegates don't flutter either.

wastegates regulate boost.

they are help shut by a spring.

if the spring is only good for 10 psi, then once it gets there, the wastegate will be wide open to make sure that no more boost is made.

it sits on the side of the turbo's exhaust wheel and is simply a flap that opens to regulate boost.

if you've ever had a chance to hear an external wastegate you'll understand what I mean.

to give you a rough description, the sound would be the same as a turbo, boosting at lets say 15 psi, and the exhaust comming off it is only 30 cm long with no mufflers.

it is pretty much a really loud SCREAMING sound.

that's why alot of the times people refer to screamer pipes in exhaust systems.

which just means the wastegate pipe is open to atmo rather than back in to the exhaust.

[someonestolecc]

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.

Point taken - I stand corrected as not paying attention to the detail of what you said, my bad sorry

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.

I don't know about anyone else but when I was looking for the wup wup wup BOV I wasn't referring to the fluttering caused by reverberation (BOV too tight or no BOV)... I am quite certain there is a BOV that makes the noise I'm referring to

It didn't help that the sound when typed can be interpreted as reverberation when the BOV is too tight or there is no BOV.

I might try to capture it from the DVD when I can be bothered to find some capture tools

[TTT]

CC - Unless you get a video image of the bov opening and closing and the sound comming from the bov, I still stand by my opinion that the sound is that of reverberation.

I just assume it sounds different to mods due to number of things I listed in a previous post.

cooler piping material, intake pipe material, turbo choice... lots of things can change the pitch of the sound or the speed of each sound (call it chu chu chu or whatever)

Not sure if you've had or had friends with VL turbos.

in standard setup using all stock parts plus a pod filter and more boost, the fluttering sound is a normal chu chu chu.

once FMIC is installed and nothing else changed, the sound goes deeper.

Once the turbo is changed to something large and new (BB turbo rfom the GT range) the sound is totally different.

but still, it is caused by the air back through the turbo.

I used to have an 88 TX3 turbo ex rally car.

hi flowed stock turbo.

1 bar boost

stock intercooler.

no afm

aluminium intake pipe with UNIFILTER foam pod.

the fluttering sound from that was most usually described by others as a horse.

go figure..

not the neigh sound they make but the other one where it sounds like they are just snorting out air.

my naighbour (across the road from my parents place) runs a completely sotck FJ20T engine in a gemini.

using stock turbo

NO INTERCOOLER

no intake pipe.

microtech computer.

he has a k&n pod filter on the front of the stock turbo.

18 psi boost.

when he changes gears, you can hear it from 4 blocks away.

the wierdest sound I have ever heard..

because the pipe goes straight from turbo to plenum (about 60cm in length) the fluttering sound is not even fluttering.

it is like a prrrrrrrrrrrrrrr sound.

and at 18psi it is really high pitched.

my brother had a liberty RS turbo.

they have a top mounted water to air intercooler.

and the turbo on the subaru's are just to the side.

he removed the stock plumback bov and blocked up the holes and vacuum line.

now the turbo to inter pipe is about 30 cm (if that).

the intercooler sits ON the throttle body basically so say about 15 cm of pipe there.

with a pod filter ont eh end of the intake pipe, and 15psi going through it, on gear shifts, it made a totally different sound again.

still some sort of prrrrrr sound, but different to the gemini, my laser or 200sx's and gtrs with no bovs.

supra's make a different sound once again.

my point??

different type of fluttering sound.

same reason.

no bov, tight bov.

the sound variation is because of the differences in setup.

[Phantom32]

ok ok ok

i started this thread in the hope that people would share their knowledge of the different BOV's and the sounds they make in the hope of finding the one i'm after.

now it seems ppl just like to argue and prove others wrong. As a forum i thought we were meant to help each other gain knowledge, not flame each other everytime someone makes a mistake. how else are we meant to learn?

now, i've had both the apex'i twin chamber and the SSQV. The apex'i was good (don't know why i got rid of it), and the SSQV got really annoying after awhile, like someone else mentioned. At low boost the slight flutter (yes, it DOES make a slight flutter sound) was good, however, at high boost the whistling started to get really annoying. I know that most flutter can come from reverberation, and depending on what filter it makes a different sound eg. HKS mushroom made a flutter.

i've recently changed to a K&N pod and found that it now sounds more like a silent fart (weird, but it does, like a subtle 'whoosh')

i'm not a huge fan of BOV's, i think the stock one is fine, but if i can find the one that i'm after then i will get it.

I''ll try the Turbosmart Veeport 2, and the Greddy as was suggested by a few others in this thread, and see how they go.

but nobody has answered if they know what the r2d2 sounds like. If you do, give us a yell.

thanks to all the people who contributed with positive replies.

[TTT]

I had the R2D2 on my skyline when I bought it.

it goes PSSHHHHH

so does the Veeport.

greddy type S makes a similar sound to the HKS SSQV.

greddy Type R... not sure what sound it makes.

[Phantom32]

cheers mate, none of those are the ones i'm after, so i'll guess i'll have to keep looking.

Maybe its the Type R, who knows?

Anyone?

[foznice]

GTST, I heard (can't remember where, could be BS) that compresor surge can include a stall and in worse cases a forward/backward jerking motion. But I take the the jerking motion thing back as I can't really back it up, In any case I know that the compressor wheel slows down in the case of compressor surge.

[SuAvE-1]

GTST is right in his theory as far as I know but there is one point i would like to make. There could be at least on BOV design out there which is engineered to make a 'flutter' noise by say using a disc to open and close the venting port a predetermined interval - say venting - closed - venting - closed etc... It would probly not be as effective as a normal, correctly adjusted bov, but it could still make that 'flutter' type noise if you know what I mean.

In my previous car, a series 4 rx-7, I used a basic type 1 littlle auto barn bov. I also had a K&N pod filter. At lower revs when I would release the accelerator (say before 2000rpm), there would be a reverberation because there wasn't enough boost pressure to open the bov and the noise of the remaining air pressure would 'cut up' against the turbine wheel, which would be amplified by the pod. At 3500rpm, there would be less noticable reverberation and a low whoosh noise coming from the bov as their was enough pressure for the bov to vent a bit. At 5000rpm, no noticeable reverberation and maximum output on the bov.

I'm not 100% on this, but i think an intercooler would have the same effect of amplifying the noise by the air being pushed up against the turbo for the sake of this arguement. A lot of people call it 'the intercooler noise' or "the intercooler is what creates the noise". yeah right.

I've lost track of most of what has been said, but this is what I know, and anyone can challenge me on it.

If you want to experience reverberation, trying blowing air out of your mouth as hard as you can against a room or pedastal fan. There is definetly a noise.

[someonestolecc]

GTST interesting point you make. Maybe I'm wrong and it is tightened BOV.

Still ... damndest reverberation I've ever heard so until it's confirmed to me I'm going to think it's the BOV with the possibility of it being too tight

If I cap it it'd be interesting to see what you make of it.

[choyda]

Here is the sound a 180SX makes with a Turbosmart Type 2 thats been wrongly adjusted. This is what I was told when this sound was sent to me.

[Cool Hand Luke]

Type-R makes a pkshhhhh noise, similar but quiter to the blitz.. IMO sounds like a typical bov.

HKS super sequential make a high pitched whistle, and i've heard when you change the disks at the top they make a lower pitched sound, but if setup correctly wont cause reverberation.. As GTST said if you tighten it too much it will, but that sound is coming from the turbo not the bov, and is coming from the turbo because the bov isn't doing anything.

WRC to my knowledge dont need bov's as with their anti-lag there isnt a problem with lag, and i dont think their turbo's shaft play would be a problem as i'd say they are changed much too often for that. I would think with the small restrictor on the turbo that the woop woop would change to a chip chip because its a much smaller hole... but once again as gts-t said there are so many variables into how reverb sounds.. to be honest i havent heard many cars that sound the same.

I also thought there was a valve that made the wuup wup wop wop or whatever sound, until i bought my last car which was a sr20 180sx. It had a blitz bov, and when i bought it it made 2 different fluttering noises. 1 at low boost, then a much different sounding flutter on high boost. As it was running 2bar of boost, i thought the first one was reverberation and the 2nd one was the bov..... until oneday checking for a boost leak i found out that the bov was not even working, once fixed it made the terrible pitkshhhhhh sound the blitz make. I stand by GTST in that a correctly working bov will not make a flutter sound, and probably can not unless it has a fan spinning one way with air blowing through the other... and by the size of the fan i would say it would sound pretty daft.

Goto exvitermini.com and movies/8thsin and watch the movies of that car, regardless if it has a bov fitted, it isnt working and that is reverberation.. is this the sound your after?