Modded Rb25, Plumb Back Bov Too Loud And Flutter Is Annoying, Suggestions?

[Rolls]

I've got the standard rb20 plumback bov on my rb25 (r32 with 25det and highflow) but its just way too loud even on 10psi, sounds like a stupid aftermarket hks gay one.

I was considering putting a gasket with a very small hole on the bov, limiting how fast it can vent the air to try and quieten it down.

I like the sound the pod makes so I don't really want to remove this, is there any easy way to keep the induction noise but quieten down the noise when you throttle off? Is my idea likely to work?

Edited June 30, 2010 by Rolls

[bubba]

Restricting the size of the bov orifice in an attempt to decrease the amount of air it can vent, will just cause more flutters... I don't think you'll be able to get less bov noise without also getting less induction noise (i.e. change filters).

[Rolls]

I don't mind if it flutter a little, currently it doesn't at all. I guess I will have to try and see if there is any medium where there is a little of both.

[tridentt150v]

Tried changing the spring size?

[Rolls]

Tried changing the spring size?

Didn't know you could, how difficult is it to pull apart? Guess all I need is a stiffer spring, or preload it with something.

[lachlanw]

you cant change the spring

[3LGODZILA]

either rb20 bov's are pretty loud or yours and my definition of loud is different, ive got a r32 gtr bov on my rb25 and i dont think its loud at all, i had an apexi dual chamber bov on there before (a fairly quiet atmo bov) and the gtr bov is much quieter.

Edited June 30, 2010 by jimmys-33T

[Rolls]

Well it is quieter than a proper aftermarket atmo venting one, but it still is loud enough for people to look at you like a dickhead everytime it comes on boost.

[GTScotT]

Well it is quieter than a proper aftermarket atmo venting one, but it still is loud enough for people to look at you like a dickhead everytime it comes on boost.

Its a skyline, you automatically have hoon tattooed to your forehead when you drive it. Wear this with pride.

[Rolls]

Its a skyline, you automatically have hoon tattooed to your forehead when you drive it. Wear this with pride.

Yeah, I used to have a 2 door HR31 and you got lots of 'wow I have never seen one of those before' looks now I just get 'wow you are a dickhead'

Edited June 30, 2010 by Rolls

[Hanaldo]

GTR bov will probably be quieter at 10psi, they only start to get loud when you run lots of boost. Get a GTR bov

[Rolls]

GTR bov will probably be quieter at 10psi, they only start to get loud when you run lots of boost. Get a GTR bov

What is the difference, just a stronger spring? I wonder if there is a way to open it up, would be easier if I could just preload the spring in mine with a few washers.

[bubba]

You can't open them up but you can squish the housing a bit to add some preload, have a search as I'm sure I've seen it covered here somewhere before.

[Rolls]

Made a gasket out of a coke can, cut a square hole about 1cm^2 in the middle, put it on top of the original metal gasket and did it up as tight as I could. Result was very quiet flutter and no BOV noise, the car is also much faster so I'm guessing the old one was leaking boost for whatever reason, or possibly was opening up whilst on vacuum making the turbo work harder.

Highly recommend it to people who want flutter but not annoying VL dose style, or if they want to quieten down the bov noise, I'm sure if I made the hole slightly bigger it would be even quieter again.