Atmo Bov's Are Gay

[NateR31]

my stock plumbed back one is just as loud as some after market ones.

[scathing]

It just sounds like the BOV is too loose. Can you tighten the Blitz unit?

But yes, I'm not a big fan of atmo BOVs either. If my induction is going to make noise on throttle-off, I'd rather it flutter than sneeze.

[Kinks]

I put a GFB basic on my car for a few weeks and although I liked the smoother gear changes and didn't mind the sound at first, it ended up grating on me and I removed it. Compressor surge is so much more tolerable than going whoosh every time you back off a bit.

[lordsnipe]

It just sounds like the BOV is too loose. Can you tighten the Blitz unit?

i'd put my money on the BOV needing adjusting.

stalling issues and sluggish acceleration can be due to the spring being too soft. when it vents, the bov is staying open for too long = stall. if you are giving the car shit, the bov may open = crappier acceleration.

not sure about your fuel economy either .. i get just over 12L/100kms, calculated by distance travelled and how many litres it takes to fill up (the only real way to measure economy).

I don't see how an atmo BOV can affect fuel economy. the side effect of an atmo BOV is that the car runs rich due to the air escaping rather than being plumbed back in. But if you were running a plumbback, you would be still using the same amount of fuel .. just not running rich as all the air is still available?

[krzysiu]

I went the other way around. The car came with the HKS SSQV. If i changed gears next to other people they would jump in their cars. Until i discovered the stalling problems, mind you i have only owned the car for a day lol. Bought a stock plumb back bov. All is good. Still loud enough to hear the Pssshhh

[scathing]

I don't see how an atmo BOV can affect fuel economy. the side effect of an atmo BOV is that the car runs rich due to the air escaping rather than being plumbed back in. But if you were running a plumbback, you would be still using the same amount of fuel .. just not running rich as all the air is still available?

I'm assuming his car's running an AFM. Since an AFM expects the induction to be closed, it will pump the amount of fuel equal to the air that passes through the AFM.

If you're venting air out it'll run rich since you're actually getting less air into your engine than what its measured. On a car with a nicely sprung BOV it'll only run rich on throttle-off, so the exhaust will crackle and pop (and maybe puff some black smoke).

If the BOV is loose and leaking, then it'll run rich on throttle too. Since the thing's not making as much power (if you compare it at the various RPM points) you have to work the engine harder to go as quick.

[Nozila]

i found from previous experience in my sil80 that having the spring loose or not loose doesnt effect the stalling issues associated with atmo bov's. that was until i plumbed it back - works a charm now, maybe try that to rectify you problems. funnily enough, the 'line doesnt have an aftermarket bov. personal preference, i dont mind the sound - the sil80 came with the aftermarket bov.

[Roy]

i'd put my money on the BOV needing adjusting.

<{POST_SNAPBACK}>

Dido...

Not being argumentative, and not saying you need an aftermarket BOV, but i suspect many of the problems ppl have with aftermarket BOVs is the isntallation itself, not the function

Ive had a HKS Sequential, Super Sequential, Blitz, Apexi Dual Chamber, even a Monza HKS rip off. And i have never had the problems ppl describe. Hell the apparantly crappy Monza HKS knock off has been on my Skyline for over 12 months and it works fine. PPl tell me it leaks boost, but they have never used one, they just hear the name Monza and the stories start to roll.

I still run an AFM, and still get about 450kms per tank (city driving) and im running bigger turbo, injectors etc etc ... lol i aint too proud to admit im a ricer. I want as much induction noise, as much turbo whistle, as much BOV and atmo wastegate noise as possible. My god its turbo RB20...turbos are all about strange noises and bless them for it, without it they are just hoovers with no character at all, i mean my crappy old Valiant had a more exciting sound, even with a stuffed timing chain

[predator]

I never had problems, it just sounded shit

[maximumrpm]

this thread can will go on forever...ppl that have atmo bovs will say they are great and ppl that dont will always say the stock is the best...common ppl since when has anything stock ever been any good...im sure ppl will start saying that stock exhausts and coolers and fine now

[R33_Series2Lover]

If your having probs with your BOV just buy one that vents to the atmosphere and is also plumback use the SAFC to tune and the car will run great no idling probs etc. I reckon whatever floats someones boat really. You like BOV noise then do it, you dont then thats cool too We shouldnt alienate someone for wanting their car to look and sound a certain way cause thats the beauty about car modding you can do it your own way

[justin911]

I think the only thing out-gaying the atmo bov noise is the pod filter sucking noise

[Miller the hoon]

I disagree i love the SUK

mine is the loudest i have ever heard

cypher pod fmic and full exhaust

makes my bov sound quiet

[lingeringsoul]

Took mine off today and put back the stock one, the stall is just becoming a serious problem and annoying the hell out of me. Having no steering and braking control on a downhill is really making me shit my pants.

my 2c

[kimbod]

I got one of the first GFB bov's. GFB used my car for the manifold plate. I have a plumb back one . It does make a slight bit of noise due to my filter and ram tube. Some cars handle dumping to atmos better than others. Remember this air being dumped to atmo has been through the AFM ,and the ecu has calculted the mixture.I think somebody told me you should use plumb backs on Skylines because of this.

[Kennedy]

Well I did what I set out to do and changed back to the stocker BOV. I had a little hiccup with the actuator hose (when I pulled my stock pipe out of the garage there was a hose attached to it...I have no idea how it got there).

I can tell you that all my issues are fixed now. The car explodes at the 4500 RPM like it used to....It's good to back back to the land of relative quickness.

I've read all the replies and I can take in the fact that the main issue was probably the adjustment of the BOV but to be honest, the sound gets really annoying. My car is also a daily driver and I don't wanna attract any more attention than I already have from the boys in blue.

See you guys around

[xRHETTx]

...common ppl since when has anything stock ever been any good...im sure ppl will start saying that stock exhausts and coolers and fine now

<{POST_SNAPBACK}>

Reasons stock BOV are good:

They work.

If you want sound, install a pod filter and they make the noise almost as loud as an atmo one.

Cost nothing.

Take no time to install.

Are not defectable.

Reasons stock BOV are bad:

Not loud enough for your taste...

I dont think your argument is valid, noone ever upgrades their floor mats. why? because they do their job well. Maybe if you made them out of carbon fibre you would have a little bit of weight saving?

[scathing]

What RHETT said.

Modifications are only better than "stock" for your intended application.

The stock exhaust does a much better job of muffling than any aftermarket one I've heard. Of course, most people don't replace the exhaust to make their cars quieter...but it depends on your aim. You could probably build an exhaust that flowed just as well as the factory one but was quieter, but no-one wants it.

As another exampled, if all you were running was a cat-back in your powertrain, it'd be a waste of time and money to drop a triple plate, high clamping force, clutch into the car. Sure, its "better" in the sense that its less likely to wear out or break, but your car doesn't need it for your application and now your clutch is a lot heavier and harder to launch smoothly.

The factory BOV does a better job than an aftermarket one in terms of idle quality and suitability in a light tune application. Only when you've cranked the boost beyond the ability for the factory BOV to cope (or you just want some fooli sik sounds to emanate from your induction system) do you need to replace it.

[Daniel_]

Something I've always wondered, why do 99% of WRXs have an atmos BOV and like only 20% of skylines.

Just a difference in cultures between groups or does the wrx actually need it?.

[benl1981]

I found the smae problem. My car had the stock BOV and another HKS one along with an exposed POD.

After removing the atmo venting BOV I found response when you change gears was a lot better - it would jump quicker once going into the next gear that is. The sound was still there though.

I bought a stock snorkel and air filter box so now it is pretty quiet. But if you want a BOV noise you can just put on a POD and even the stock BOV makes quite a loud psht as you can hear it through the exposed POD...if thats what does it for you