BOV Question.........
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 3,296
Likes: 30
From: Friendswood, Tx
BOV Question.........
I've got the stock ATI twin i/c kit with a "Blitz" BOV. The BOV works perfectly and has neven given me a problem......but under even the very slightest de-acceleration it's "hissing".
For instance when the car is set on cruise control at 70 and it starts slowing because of the down side of an overpass it starts hissing- and it's quite annoying. Driving around town doing 35-40 it'll do the same thing....and it sounds like s*&t IMO......not the cool "puff" sound when I hear at WOT when I get out of it....almost like a bad lifter or an exhaust leak.
Surely all BOV's don't make this annoying "ticking/hissing" sound under these slow/normal driving conditions. Anybody know what could be wrong? Can I adjust it? What other BOV's are you guys using- any feedback is appreciated.
-Busa196-
For instance when the car is set on cruise control at 70 and it starts slowing because of the down side of an overpass it starts hissing- and it's quite annoying. Driving around town doing 35-40 it'll do the same thing....and it sounds like s*&t IMO......not the cool "puff" sound when I hear at WOT when I get out of it....almost like a bad lifter or an exhaust leak.
Surely all BOV's don't make this annoying "ticking/hissing" sound under these slow/normal driving conditions. Anybody know what could be wrong? Can I adjust it? What other BOV's are you guys using- any feedback is appreciated.
-Busa196-
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 3,296
Likes: 30
From: Friendswood, Tx
Originally Posted by pwrshhftd
why dont you put the stock "MUFFLER" on it?
My set up has a 2 foot length of pipe and a small K&N filter on it.
My set up has a 2 foot length of pipe and a small K&N filter on it.
Melting Slicks
Joined: Dec 2002
Posts: 2,480
Likes: 62
From: Middletown DE
Originally Posted by Busa196
I've got no idea what you're talking about or why it would help?
on the stock setup, there was a 2ft hose attached with the filter, i dont recall hearing much of it with that on.
You can always route a tube fromthe BOV to another location to cut down on the noise, like maybe the driverside brake duct????
Burning Brakes
Joined: Oct 2000
Posts: 1,135
Likes: 17
From: NJ
I have a plastic BOV on mine and it makes the same noise. I want to change mine too, eventually, because it does sound like crap sometimes.
Mine also has a small breather on it......any one have any ideas?
Mine also has a small breather on it......any one have any ideas?
Melting Slicks
Joined: Apr 2002
Posts: 2,683
Likes: 0
I the Vortech Race BoV and don't get any hissing that I'm aware of.... Could it be the mounting location of yours? Mine is wayyyy down in the front on the bottom, maybe that's why I don't hear it???
Perhaps a change of location would help?
Perhaps a change of location would help?
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Melting Slicks
Joined: Mar 2002
Posts: 2,931
Likes: 2
From: Tx
The problem is the fact that you are using a BOV (designed to amplify the sound (a la ricer)) as a bypass valve. Bypass and blowoff are similar, but the bypass is really designed for a turbo where you only have air released out of the valve just after high loads (the wastegate does the rest).
I've said this before, but nobody will listen. The stock ATI BOV is perfect and sounds great when setup correctly. It does leak a tiny bit of boost, but not enough where you would ever notice it. I'm sure the vortech race valve is also pretty good, but I'm not sure how well it flows.
A big valve (designed to move lots of air) with a big flange, or two valves is what is required to get a nice clean sound while not making boost.
I've said this before, but nobody will listen. The stock ATI BOV is perfect and sounds great when setup correctly. It does leak a tiny bit of boost, but not enough where you would ever notice it. I'm sure the vortech race valve is also pretty good, but I'm not sure how well it flows.
A big valve (designed to move lots of air) with a big flange, or two valves is what is required to get a nice clean sound while not making boost.
Last edited by QuickSilver2002; Jun 2, 2005 at 01:10 AM.
Race Director
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From: CA
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Originally Posted by QuickSilver2002
A big valve (designed to move lots of air) with a big flange, or two valves is what is required to get a nice clean sound while not making boost.
JB
Burning Brakes
Joined: Dec 2004
Posts: 1,117
Likes: 0
From: New England
Originally Posted by QuickSilver2002
I've said this before, but nobody will listen. The stock ATI BOV is perfect and sounds great when setup correctly. It does leak a tiny bit of boost, but not enough where you would ever notice it. I'm sure the vortech race valve is also pretty good, but I'm not sure how well it flows.
Melting Slicks
Joined: Mar 2002
Posts: 2,931
Likes: 2
From: Tx
Originally Posted by SS930
Is the ATI BOV you're referring to the same one which Andy supplies with his basic kit? The basic BOV from Andy's kit appears to be a Bosch piece similar to the one used on some of the turbo Porsches.
I had that valve on before and it made the car sound like it was sick at high rpm and low load. Like there was a wounded animal under the hood. Now I just hear rushing air under those same conditions. Like a jet sound, and a nice woooosh when coming off boost.
Last edited by QuickSilver2002; Jun 2, 2005 at 11:07 AM.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 3,296
Likes: 30
From: Friendswood, Tx
Originally Posted by QuickSilver2002
The problem is the fact that you are using a BOV (designed to amplify the sound (a la ricer)) as a bypass valve. Bypass and blowoff are similar, but the bypass is really designed for a turbo where you only have air released out of the valve just after high loads (the wastegate does the rest).
I've said this before, but nobody will listen. The stock ATI BOV is perfect and sounds great when setup correctly. It does leak a tiny bit of boost, but not enough where you would ever notice it. I'm sure the vortech race valve is also pretty good, but I'm not sure how well it flows.
A big valve (designed to move lots of air) with a big flange, or two valves is what is required to get a nice clean sound while not making boost.
I've said this before, but nobody will listen. The stock ATI BOV is perfect and sounds great when setup correctly. It does leak a tiny bit of boost, but not enough where you would ever notice it. I'm sure the vortech race valve is also pretty good, but I'm not sure how well it flows.
A big valve (designed to move lots of air) with a big flange, or two valves is what is required to get a nice clean sound while not making boost.
Anyway, sounds like I need to purchase a Vortech Race Valve? Anyone have pics of this, or personal experience with it? 
