Bov Sound?

[pizza boy]

Ive heard the usual 'patiiish!' then ive heard the whistly kinda bov sound but what on earth creates this wierd hiss HISS HISS HISS HISS hiss?? kinda sound? Like some rattle snake hissin type sound

It also doesnt cut out (like a bov) when you press on the gas after an upshift.

Ive only ever heard it on downloaded vids of skylines and the odd supra too. Urm just so I dont sound loopy to give you an idea of the sound the R34 in 2f2f makes it too. What makes this sound? If its a BOV what make?

[Sirius]

I would imagine that you are describing the noise of the turbo spooling (spinning) up, its a constant hiss whenever you are accelerating.

You hear it through the induction kit if the car has one, normally the stock airboxes muffle the sound out.

[nws25]

Could well be a BOV sticking, one of mine used to do it, or most likely an external wastegate if its doing it while on boost.

[Bibbs]

External wastegate for defo .. thinking about one on my turbo upgrade ..

I want as much noise as possible !!

[pizza boy]

Bingo..yea ive checked the specs on cars with this sound and it IS an external wastegate thats creating it. I knew they were a key component to upgrade generally but I never knew they made that sound..jesus does it sound eeeeeevil or what! Makes me really want to get one now. hehe Rice or what!

[Bibbs]

defo rice .. and defo want one !!

[nws25]

Not an item you can really upgrade, unless you have a nice BIG turbo, as most stock/hybrid turbos come complete with built in wastegates.

[Monster-Mat]

ive got 2 :P this is the rear one :)

[pizza boy]

I was going to go down the hybrid route in future rather than an all out replacement. I thought it was optional to get an ext wstgate.

[nws25]

Not as far as I'm aware mate, and we use the same turbo, albeit you have the twin entry.

[JappyBeast]

Bov Sound? what makes it? - usually me leaning out of the window making the sound myself!

I know a guy that had to get one removed because his girlfriend thought it sounded like a Trent bus!!!

I would tell her to walk.

[Ian_M]

i get this sound on my greddy BOV when im off the throttle weird wishtle sound

[Karma Supra]

could also be fiter flutter!!!!!!! -running no BOV at all and and induction kit - mine does that, kinda, but its dofferent as theres 2 sets of compressors :D

[Jimlad]

do you mean the "phmpfh ... phupmh... pffffh... " sound ???

my motor does that.. sounds like it's had too much curry.

[nws25]

I've changed my mind here, you wont get a hissing sound from a external wastegate especially one thats vented to atmosphere, they really are a horrific sound and not a hissing.

I think its a BOV sound as mine sounds like a rattlesnake now and again for some reason.

[Karma Supra]

I've changed my mind here, you wont get a hissing sound from a external wastegate especially one thats vented to atmosphere, they really are a horrific sound and not a hissing.

I think its a BOV sound as mine sounds like a rattlesnake now and again for some reason.

that'll be when it doesn't open up, and the compressor blades have to "chop" thru the non moving air... almost likea helicopter sound on a smaller scale..

external wastegates chatter and go bang. (rally cars)

[pizza boy]

I've changed my mind here, you wont get a hissing sound from a external wastegate especially one thats vented to atmosphere, they really are a horrific sound and not a hissing.

I think its a BOV sound as mine sounds like a rattlesnake now and again for some reason.

that'll be when it doesn't open up, and the compressor blades have to "chop" thru the non moving air... almost likea helicopter sound on a smaller scale..

external wastegates chatter and go bang. (rally cars)

Most of the cars ive heard producing this sound are in a very highly tuned state. This 'chopper' sound...is it 'bad' then?