Apexi Bov.... Any Ideas?

[Beef]

Hey ladz,

Today i was mucking around in the engine bay and i was taking a good look at my Apexi BOV... and noticed that it has a red metal band around it that has 3 different size holes in it... i was like why..?

so i touched it and it span around...

Why would my BOV have this feature and what does it do? change the sound of it or what?

i have attatched a couple of pics so you can see what i mean...

Beef

[GtstCoupe]

i think that is really al it does, is cange you sound , becuse you have

your spring pre-load a adjustment on the top of the valve so , that is

what is must be , and may allow to get more air out , but not too sure tho.

cheers

[Guest 40th-edition]

is it recerculated or to atmo?? or both

i agree with gtstcoupe it would just be a sound thing..

try it and see, go for a drive

[khunjeng]

If the pressure release valve (or BOV) contains a horn or small holes/vents it will cause the air to make a louder/higher pitched sound depending on what is used.

so its def. the sound adjustment...

[Beef]

Ok here is what i think it is after a bit of research.

you can change the diameter of the pressure outlet.... which means you can make it not realease as much boost pressure between gears.. so if you have it on the biggest hole it will relese all the boost pressure when you change gears.. but if you change it to the smallest one it wont be able to get rid of it all thus it will hold boost between gears...

sounds right?

Edited August 27, 2006 by Beef

[barnoon]

I have the exact same BOV as you mate and ive moved the band around thinking it would change the sound but I cant notice any difference at all no matter what setting its on

[Beef]

I have the exact same BOV as you mate and ive moved the band around thinking it would change the sound but I cant notice any difference at all no matter what setting its on

yeah i really dont think its a sound thing at all... if you think about it... how would it change teh sound anyway?

it is a way of boost holding... it just doesnt release it all between gear changes so that the turbo doesnt have to spool all the way up again....

thast all it is

[andy95'R33GTR]

hello guys... i really searching for my BOV? i can't locate it from the engine...and my twin turbo is really very tight inside....where is the exact location of the BOV? is it the one that sounds when i rev and change gear????? because i wonder why i can't hear anymore the other sound that pssst.....sound....even when the car is not running and just reving it high/????help

[paulr33]

gtr twins are at the front of the car left of the intercoooer.

follow the pipework from the core and youll find them

[andy95'R33GTR]

so when im facing the car...on the left??? thanx paul

[mad082]

yeah i really dont think its a sound thing at all... if you think about it... how would it change teh sound anyway?

it would change the sound in the same way that changing the shape of your mouth can make you whistle.

you'd probably find that on high boost applications it could make a difference.

[andy95'R33GTR]

ow man....i still can't find my BOV....help....i tried to look under the intercoolers...but can find it....help please

[mad082]

i think it is in the inner guard on the passenger side. there is always the chance it has been taken off.

[andy95'R33GTR]

when to know if i have a BOV installed??? what will happen if i don't have BOV installed in my car??? do you have a yahoo messenger mad??? can u add me [email protected] thanx

Edited August 28, 2006 by andy95'R33GTR

[TTT]

The adjuster on the Apexi bov is for the PITCH of sound it makes..

The size of the hole will ALTER the PITCH of the sound it makes.

It doesn’t hold boost in or have anything to do with boost.

Just the sound it makes on release..

Small hole means slightly less sound and it a little more high pitched.

Larger holes make more sound and not as high pitched.

Stock GTR bovs are on the drivers side of the car.

Follow piping from intercooler up to engine bay on drivers side.

[HypeR33]

yeah i really dont think its a sound thing at all... if you think about it... how would it change teh sound anyway?

it is a way of boost holding... it just doesnt release it all between gear changes so that the turbo doesnt have to spool all the way up again....

thast all it is

The red collar is for sound adjustment, and the screw on the top of the BOV is for spring tension adjustment.

[HypeR33]

when to know if i have a BOV installed??? what will happen if i don't have BOV installed in my car??? do you have a yahoo messenger mad??? can u add me [email protected] thanx

If you dont have a BOV installed you will get the 'flutter' noise from compressor surge.

[Beef]

The adjuster on the Apexi bov is for the PITCH of sound it makes..

The size of the hole will ALTER the PITCH of the sound it makes.

It doesn’t hold boost in or have anything to do with boost.

UM NO... i have tried it on all different settings on full and half boost and there is NO change in sound.. however.. there is a difference in LENGTH of the release sound... but NOT PITCH of sound.. the below is an exerpt from the Apexi USA SITE:

"The blow off valve is also adjustable to allow desired amounts of boost response between shifts"

So there it is... it is adjustable to control the level of boost released between shifts.. NOT SOUND

IT IS BOOST CONTROLLING....