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I supported Toymods
Location:
fairfield NSW
Registered:
January 2003
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legalities of BOV
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Fri, 26 November 2004 23:10
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is it true that you can have a BOV on your car IF it is a plumb back unit? and what about cars that have BOV standard?
(fyi i ran a search for old BOV legality threads and there was just too many generic threads so i started a new one)
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Location:
Wollongong
Registered:
May 2002
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Re: legalities of BOV
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Sat, 27 November 2004 01:42
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Yes, your statement is true.
Cars that have a BOV standard are all plumb back, hence them also being legal. I'm yet to see any car from the factory having a venting BOV.
BTW, my comments are valid in NSW. Not sure about other states.
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Location:
Melbourne
Registered:
November 2003
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Re: legalities of BOV
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Sat, 27 November 2004 02:19
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Unless you have a MAP sensor you don't want a venting BOV anyway.
In Vic, plumb backs are legal and venting BOVs aren't.
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Location:
Whyalla
Registered:
June 2004
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Re: legalities of BOV
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Sat, 27 November 2004 03:52
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Are hybrid units legal, ones that can vent to atmosphere and plumb-back?
If not, do what Im doing and save up for a Stealth FX 
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Location:
Melb, Victoria
Registered:
April 2004
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Re: legalities of BOV
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Sat, 27 November 2004 08:08
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| woofa347 wrote on Sat, 27 November 2004 14:52 |
Are hybrid units legal, ones that can vent to atmosphere and plumb-back?
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good question. i've thought about this idea too.. but i really doubt it WILL BE legal.(in vic atleast)the main reason why venting bov's are illegal is because the emissions arent passing through a cat converter.
would a venting be legal in a pre nov 1985 car though???
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Location:
Whyalla
Registered:
June 2004
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Re: legalities of BOV
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Sat, 27 November 2004 11:53
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would a venting be legal in a pre nov 1985 car though???
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Good question indeed, I would love to know because my Cressida is October 85 
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Location:
perth WA
Registered:
June 2004
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Re: legalities of BOV
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Sat, 27 November 2004 12:25
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Why would compressed AIR have to go through the CAT?
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Location:
Whyalla
Registered:
June 2004
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Re: legalities of BOV
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Sat, 27 November 2004 13:14
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Something about, its not just air that is being vented, their could be fuel or something like that being vented aswell. Im not too sure, but someone else will explain it further hopefully
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Location:
Brisbane
Registered:
May 2002
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Re: legalities of BOV
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Sat, 27 November 2004 13:22
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The reason atmo-venting BOV's are illegal is because they vent oil (ie hydrocarbon emissions), not just air.
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Location:
perth WA
Registered:
June 2004
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Re: legalities of BOV
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Sat, 27 November 2004 17:20
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Is that from the compression of the air and the heat produced or from the oil feed to the shaft?
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I supported Toymods
Location:
fairfield NSW
Registered:
January 2003
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Re: legalities of BOV
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Sat, 27 November 2004 20:18
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so plumb back BOVs have hoses going back into the air box, right? im just trying to get my head around this so i can somehow fool the police. 
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Location:
Wollongong
Registered:
May 2002
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Re: legalities of BOV
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Sun, 28 November 2004 00:44
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| woofa347 wrote on Sat, 27 November 2004 14:52 |
Are hybrid units legal, ones that can vent to atmosphere and plumb-back?
If not, do what Im doing and save up for a Stealth FX
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I have verified this already with the Police, and in NSW at least, they are legal. I have the Stealth/FX BOV. The copper just said that as long as it's set to recirc while on the street, you are fine.
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Location:
sydney
Registered:
November 2003
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Re: legalities of BOV
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Sun, 28 November 2004 01:05
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plumb back bov's have a hose that go back to the inlet of the turbo ( Filter/air box )
A certain amount of oil will come out of a bov that isnt a plumb back one as well as more than just compressed air ( a bit of exhaust and stuff like that )
unfortunately i couldnt be bothered buying a plumb back bov as i had a spare turbo xs one sitting around. So all i did is mount it underneith my intercooloer pipeing down next to my gear box You can still see a bit of it but more often than not i dont think it will get noticed.
The plumb back ones sound like the cars in fast and the furious. My bro has one on his car.
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I supported Toymods
Location:
fairfield NSW
Registered:
January 2003
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Re: legalities of BOV
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Sun, 28 November 2004 02:22
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anyone know where to go to get a silicon I/C piping that has an extra bit hanging off it for the BOV? i think AVO had one for the wrx something similar...
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Location:
brisbane
Registered:
October 2004
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Re: legalities of BOV
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Mon, 29 November 2004 14:33
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its an easy spot for cops doing ur car over - most aftermarket atmo venting bov are bright and shiny, hybrid is the way to go! i wish it could b changed in cabin tho hmmmmm....
also the hybrid is variable ratio which is awesome cos it controls the sound factor - ie variable loudness too
plumb back legal - aftermarket bosch type commonly used
atmo venting - illegal as far as i know
id get a hybrid, paint it black and try to install
it hidden as possible...
with <i wish> in cabin switch - no officer u didnt hear a bov
goin past at 200km/h... my bov is plumb back hehe 
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Location:
Brisbane
Registered:
May 2002
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Re: legalities of BOV
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Mon, 29 November 2004 15:00
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Why have atmo venting (even "hybrid" atmo venting) at all? I don't understand why people want to make their car sound like a city bus. And yes my car sounds like a city bus right now and it gives me the shits; as soon as I find a way to get a proper airbox in my car my BOV will be recirculated and hopefully much less annoying.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: legalities of BOV
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Tue, 30 November 2004 02:35
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What about the ones fitted to trucks. Surely they are the venting type or is the noise coming from a pneumatic clutch?
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Registered:
May 2002
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Re: legalities of BOV
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Tue, 30 November 2004 03:14
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depends how old your car is ... one of the adr's say that its only post 85 (?) cars that cant have atmospheric blow off valves ..
why do u want one anyway ?
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Location:
Wollongong
Registered:
May 2002
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Re: legalities of BOV
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Tue, 30 November 2004 04:19
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| gold28 wrote on Tue, 30 November 2004 13:35 |
What about the ones fitted to trucks. Surely they are the venting type or is the noise coming from a pneumatic clutch?
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I think you are hearing air brakes there dude. I've never heard a truck with a venting BOV. Do big rigs even use them ?
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Location:
Inside a giant turbo (syd...
Registered:
June 2002
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Re: legalities of BOV
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Tue, 30 November 2004 05:34
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hah reminds me when i saw a semi with an atmo venting bov! i dont mean the brakes i mean 25 psssssssssscchhhhht before it was going 60 haha.. oh however many gears it had.
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Location:
Adelaide
Registered:
September 2004
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Re: legalities of BOV
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Tue, 30 November 2004 10:56
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I dont see why people want venting BOV's...or at least excessively loud ones anyway...All it does is attract attention to yourself...then you complain when you get defected for having one...hmmm. Who really needs that extra attention already??
Jon
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Location:
Madrid - Spain
Registered:
August 2002
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Re: legalities of BOV
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Wed, 01 December 2004 02:06
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Definitly not brakes. These puppies go psshhhtttt on gear changes.
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Location:
Wollongong
Registered:
May 2002
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Re: legalities of BOV
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Wed, 01 December 2004 03:03
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Weird...
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Location:
Melb, Victoria
Registered:
April 2004
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Re: legalities of BOV
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Wed, 01 December 2004 05:23
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from what i've been told, the bov's u hear on trucks are actually plumbacked, there just really loud still.and having a nice venting bov sounds good. just admit it. people want venting bov's becuase they sound cool.i can understand some people saying they are sick of the sound.
i havn't got a bov yet, just flutter from my filter.it sounds nice.
i think a hybrid is a really good idea, and if i get a bov in the near future it will most likely be one of them.
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Location:
brisbane
Registered:
October 2004
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Location:
Brisbane
Registered:
May 2002
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Re: legalities of BOV
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Sun, 05 December 2004 06:25
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| gold28 wrote on Wed, 01 December 2004 12:06 |
Definitly not brakes. These puppies go psshhhtttt on gear changes.
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Air shift. Diesels don't have throttle plates, hence a BOV isn't needed and wouldn't work anyway.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: legalities of BOV
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Sun, 05 December 2004 09:14
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I suspected as much
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Location:
sydney
Registered:
August 2004
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Re: legalities of BOV
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Sun, 05 December 2004 10:18
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Im not catching on but i saw something about 85 and down is legal? i have a 84 model mazda 929 is it possible for me to have a bov?
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: legalities of BOV
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Sun, 05 December 2004 18:13
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isnt your car n/a?
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Location:
sydney
Registered:
August 2004
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Re: legalities of BOV
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Mon, 06 December 2004 01:34
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whats n/a?
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Location:
Canberra
Registered:
October 2004
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Re: legalities of BOV
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Mon, 06 December 2004 01:45
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Naturally Aspirated:
An engine that does not feature forced induction. In a naturally aspirated engine, air flows into the combustion chambers at a rate that is equal to or less than atmospheric pressure (usually less than atmospheric pressure, due to restrictions in the intake tract).
Source: http://www.enjoythedrive.com/glossary/parse.asp?id =8420&criteria=n
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Location:
sydney
Registered:
August 2004
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Re: legalities of BOV
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Mon, 06 December 2004 01:49
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Can you use a Bov with out turbo?
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Location:
Canberra
Registered:
October 2004
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Re: legalities of BOV
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Mon, 06 December 2004 01:57
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No.
However, you can install systems that simulate the "wooosh" sound that a BOV emits.
see http://www.sunamiturbo.com/ for more info on BOV simulators.
Please note: Using above product or similar products increases the probability of you being labelled a TOOL.
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Location:
sydney
Registered:
August 2004
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Re: legalities of BOV
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Mon, 06 December 2004 02:03
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Woow Awsom product, do you use it?
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Location:
Canberra
Registered:
October 2004
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Re: legalities of BOV
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Mon, 06 December 2004 02:11
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No
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Location:
Brisbane - Chapel Hill
Registered:
June 2002
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 Re: legalities of BOV
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Sat, 11 December 2004 03:51
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The sounds the truck was making, were undoubtedly due to it using an air-shift gearbox. And yes, trucks and busses with this type of air system on brakes/clutch/gearboxes can legally vent to atmosphere for the simple reason that they are compressed air venting only. So dont be feeling hard done by.
Venting BOVs blow anyway
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