Hissing sound?

[-cj-]

Hey guys,

I know our BOV recirculates and doesn't VTA, but twice now (two days in a row), I've heard my car his...

1st time: I'm driving out of a parking lot, riding first gear to about 3.5-4k RPM and then I let off the throttle quickly... I had my window open and I hear two hisses from the engine bay.

2nd time: I'm driving to work this morning, on the throttle pretty good (60-70%) and I heard it hiss as I shift into 4th.

Do I have a boost leak somewhere, or is this sound normal for our BOV? It isn't really loud, definitely not like when it VTA, but loud enough that I was surprised that I heard it today with the windows rolled up on the highway.

[Garu]

With the stock BPV, it can't that loud at all. Only time I could hear the stock BPV was when I let off the gas at full throttle.
Can you monitor your boost? Do you have a boost gauge?
If you're not hitting 15 PST then definitely you have a leak somewhere.

[-cj-]

I don't have a boost gauge, no... Looks like I'll be installing one :) The car is practically brand new, so I'm hoping I have crazy hearing...

[Garu]

Did you recently installed an intake?
To my surprised though some speeds BPV gets substantially louder with an intake installed. It wasn't the case with my car though.

[openuser]

Any CAI will let the BPV sound escape..
If you get an SRI, stock BPV is almost as loud as VTA BOV :)

CAI: http://www.youtube.com/watch?v=I91hq9dNHuU

SRI: http://www.youtube.com/watch?v=Rmsh_oVujOo

And No, I haven't heard my BPV until I got my MSCAI

[CamelFilters]

Hey guys,

I know our BOV recirculates and doesn't VTA, but twice now (two days in a row), I've heard my car his...

1st time: I'm driving out of a parking lot, riding first gear to about 3.5-4k RPM and then I let off the throttle quickly... I had my window open and I hear two hisses from the engine bay.

2nd time: I'm driving to work this morning, on the throttle pretty good (60-70%) and I heard it hiss as I shift into 4th.

Do I have a boost leak somewhere, or is this sound normal for our BOV? It isn't really loud, definitely not like when it VTA, but loud enough that I was surprised that I heard it today with the windows rolled up on the highway.

i couldnt hear the stock bpv or heard any hissing noises before my mscai was installed. maybe there is a leak somewhere, do you notice any changes in performance? have mazda take a look at your car.

[-cj-]

Don't have a CAI yet... Car is completely stock. The car has felt a little sluggish lately, and top end hp seems to be lacking (Which is what prompted me to look into the AP in another thread)... I mean, the car still moves and moves quickly. But sometimes it just seems like it should be moving quicker... But maybe I'm getting used to the car.

I told my gf that the car seemed slow the other day and she was like "You're kidding, right?" :)