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Location:
Sydney
Registered:
June 2004
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BOV with horn
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Wed, 30 June 2004 12:03
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i am seeing alot of BOVs with horns these days and i want to know what if anything does the horn do? does it have any purpose other than looks?
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: BOV with horn
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Wed, 30 June 2004 12:24
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It provides a faster pressure release, keeping the system cooler and means the turbo can run at a much greater boost, thus providing approximately 15rwkw of extra power. 
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: BOV with horn
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Wed, 30 June 2004 12:35
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doesnt it make it louder?
and yes, i know you were kidding 4aageeza 
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Location:
Perth
Registered:
August 2003
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Re: BOV with horn
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Wed, 30 June 2004 13:49
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you know the BOV's you can adust do they make any different in power or does it just make it louder and softer
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: BOV with horn
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Wed, 30 June 2004 13:52
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BOV's do not increase power!
purly for sound effects only.
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Wed, 30 June 2004 14:30
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| Quote: |
Re: BOV with horn Wed, 30 June 2004 23:52
BOV's do not increase power!
purly for sound effects only.
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 hold on! i thought they are used to aid of pressure release from the turbo, therefore increasing the life span of the turbo itself, reducing stress within EFI system, keeping system cool as mentioned above and allowing higher boost pressures to be obtained.
if that is the case then they may not increase power directly, but indirectly they can save you heaps in cash and increase power.
i may be totally wrong but thats what iv heard and been told
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Wed, 30 June 2004 14:48
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they dont add power but they do prolong the life of your turbo by venting the backpressure which can cause a turbo to fail.
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Location:
Wahroonga
Registered:
June 2003
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Re: BOV with horn
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Wed, 30 June 2004 15:01
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| ae95 wrote on Thu, 01 July 2004 00:48 |
they dont add power but they do prolong the life of your turbo by venting the backpressure which can cause a turbo to fail.
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here is the correct answer.
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Location:
Melbourne
Registered:
November 2003
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Re: BOV with horn
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Wed, 30 June 2004 15:42
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If your talking about free venting BOVs then they do the above mentioned unless you have an AFM. Then they make you squirt un-burned fuel out your exhaust.
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Location:
Brisbane
Registered:
May 2002
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Re: BOV with horn
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Wed, 30 June 2004 23:16
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To answer the original question, the purpose of the horn is to amplify the (already annoying) noise made by the BOV, thus alerting everyone in the area that you're a sikbro with a turbo car.
BOV's are useful devices and they have their place, but in 99% of cases the factory BOV (which is nearly always silent) is more than sufficient.
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Location:
Brisbane
Registered:
July 2002
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Re: BOV with horn
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Thu, 01 July 2004 00:02
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the way i understand it is on gear changes BOV's let out the pressure so the back pressure doesent go and slow the turbo down and is better for keeping you on boost or acheiving full boost again quicker after gear changes
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Location:
sunny coast, qld
Registered:
October 2002
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Re: BOV with horn
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Thu, 01 July 2004 00:55
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slightly OT: how do you tell if your BOV is leaking? I have the stock 1jz one.
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Location:
Brisbane
Registered:
July 2002
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Re: BOV with horn
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Thu, 01 July 2004 01:04
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well i dont think yours would be leaking at the power you were making.. but i dont know lol
why are u never on msn? lol
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Location:
Perth
Registered:
October 2003
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Re: BOV with horn
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Thu, 01 July 2004 01:45
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| Jag7799 wrote on Thu, 01 July 2004 09:04 |
well i dont think yours would be leaking at the power you were making.. but i dont know lol
why are u never on msn? lol
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Power will not make a BOV leak, boost pressure higher than the spring pressure in the BOV will!
Mine had a sick trumpet coming off one of the venting holes. If you left it screwed in it made a high pitched whistling noise. If you are real trick you can do wolf whistles at shit hot girls when you drive past. 
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Location:
sunny coast, qld
Registered:
October 2002
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Re: BOV with horn
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Thu, 01 July 2004 01:56
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| Jag7799 wrote on Thu, 01 July 2004 11:04 |
well i dont think yours would be leaking at the power you were making.. but i dont know lol
why are u never on msn? lol
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why are u never on msn? I am at work during the day. sshhh 
only on msn at night.
BTW thanks Skip. so does anyone know how much boost the stock 1jz BOV can handle with stock turbos?
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Location:
Brisbane
Registered:
May 2002
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Re: BOV with horn
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Thu, 01 July 2004 03:33
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You can usually hear it when the BOV leaks, ie lots of air-rushing noise!
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Location:
sunny coast, qld
Registered:
October 2002
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Re: BOV with horn
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Thu, 01 July 2004 05:26
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thanks
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I supported Toymods
Location:
Central Coast
Registered:
May 2002
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Re: BOV with horn
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Thu, 01 July 2004 05:41
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Witht he 7M's (maybe different for 1J's?) you can hear the flutter of the WG, and if you take the BOV off you can blow through it (not normal)
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: BOV with horn
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Thu, 01 July 2004 05:49
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don't bov also help so that you don't lose as much boost through gearshifts, when you take your foot off the throttle?
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Location:
Baulko Hillo
Registered:
April 2004
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Re: BOV with horn
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Thu, 01 July 2004 05:57
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You's are all idiots... I fitted a BOV with a MASSIF horn on it to my lawnmower and it sounds siiiiiiick...... Sounds like ya mum's expulsion of air after I finished wif her last noit....
Yes, they keep the turbo spinning rather than it stopping for short amounts of time (chirping noise) as there is nowhere for the boost to go when you close the throttle. I can't remember what it is called.... re(something)ence... revergence or some such shit.
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Location:
Sydney
Registered:
April 2004
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Re: BOV with horn
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Thu, 01 July 2004 11:33
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| ae95 wrote on Thu, 01 July 2004 00:48 |
they dont add power but they do prolong the life of your turbo by venting the backpressure which can cause a turbo to fail.
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Correct. Another point.. Some Dedicated drag cars dont run BOVs simply because there isnt any on/off throttle play and theyre setup to use 100% of the boost created or attempt to..
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Location:
Camden, NSW
Registered:
June 2002
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Re: BOV with horn
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Thu, 01 July 2004 11:44
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BOV's do shit all, but i have one :S was on car whn i bought it!
They dont prolong the life of the turbo because there is SFA backpressure going through the turbo to cause it to fail. Air cannot bend/chip/melt or anything else to steel to cause the terbine wheels to fail. If it was the case, all turbo racecars would be running bov's that all go PPPSSSCCCCHHHHTTTTTTT!
It is just another way for Brand name companies to get people to pay another few hundred dollars because we are LED to believe they work instead of looking at the facts. Noone can say that their turbo failed because they didnt run a BOV, and if you said that under warranty they would laugh at you all the way out the door
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Thu, 01 July 2004 11:53
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thug_immortal
did you read what i said. they actually do serve a purpose and your well thought out conspiracy theory is wrong.
the back pressure applies a force to the compressor wheel and in turn attempts to spin the shaft the opposite way.
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Location:
Brisbane
Registered:
July 2002
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Re: BOV with horn
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Thu, 01 July 2004 11:57
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the reason why u dont hear one on all those race cars is probably cause they are plumb back and not out there to show off!
they do serve a purpose otherwise why would companies put them on stock(and plumb back)
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Location:
Camden, NSW
Registered:
June 2002
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Re: BOV with horn
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Thu, 01 July 2004 11:57
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i did read it, and i think you are wrong. THe back pressure is pushing agaisnt the turbo is correct, but the amount of pressure is nowhere near enough needed to cause damage, shaft play is not caused by this and air cannot damage steel with the pressure we are talking about so BOVs do nothing!
There will always be 3 sides to this argument, those who think they work and prevent destruction of turbo's, those who think the do nothing, and the last is those who dont care as long as it goes pppssscchhhhttttt!
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Location:
Camden, NSW
Registered:
June 2002
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Re: BOV with horn
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Thu, 01 July 2004 12:08
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plumb back as has been mentioned before stops unburnt feul from being squirted out your exhaust as the AFM needs to know how much air there is etc.
Im too tired to go into this argument right now, but i know a mate who is testing not running a bov to see if anything occurs, and its been 6 months and nothing has gone wrong so far (and he isnt a granny when driving either)
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: BOV with horn
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Thu, 01 July 2004 12:08
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| 4ageeza wrote on Wed, 30 June 2004 21:54 |
It provides a faster pressure release, keeping the system cooler and means the turbo can run at a much greater boost, thus providing approximately 15rwkw of extra power.
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...this is what I overheard of a some dude explaining the 'function' of a bov to his mate in an autobarn store  ..what a cack!
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Location:
Camden, NSW
Registered:
June 2002
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Re: BOV with horn
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Thu, 01 July 2004 12:19
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Yes plumback have a function and do help, hence y stock vehicles use them, venting to the atmos. do SFA
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Location:
Brisbane
Registered:
July 2002
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Re: BOV with horn
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Thu, 01 July 2004 12:24
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im not saying that ones that blow to atmosphere do anything
BUT they do keep the turbo spinning on gear changes
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Thu, 01 July 2004 14:52
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| Quote: |
Primary reason is to reduce strain on the compressor turbine wheel due to compressor surge. Between shifts, or sudden throttle lift-off, the turbine is still spinning very fast (but slowing) and pumping air at the closed throttle plate, as well as placing strain on the intercooler, hoses and fittings. A CBV / BOV keeps air from flowing backwards over the compressor wheel, allowing the turbine to continue spinning freely. When back on the throttle, boost pressure quickly rises again with little lag. A suitable valve location is just before the throttle plate.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: BOV with horn
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Thu, 01 July 2004 16:02
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what he ^^^^^ said...
hmmmm... lets think about it
-turbine shaft spinning at say 80,000rpm
-air column moving at around 300ft/sec
-total flow volume say 600cfm
-total pressure in system 20psi
and youre just going to snap the throttle shut on this system huh? you dont think it needs a relief valve to reduce the reflected shockwave (whos primary aim is to arrest the compressor vane)
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: BOV with horn
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Thu, 01 July 2004 21:51
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thug_immortal if bov's do nothing then why would just about every factory turbo car that comes out these days have one? Ahhh maybe the manufacturers want to just waist money
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Location:
Perth
Registered:
October 2003
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Re: BOV with horn
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Thu, 01 July 2004 23:46
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| thug_immortal wrote on Thu, 01 July 2004 20:19 |
Yes plumback have a function and do help, hence y stock vehicles use them, venting to the atmos. do SFA
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WTF is the difference? they both do the same thing, vent out excess air between the butterfly and turbo. Doesnt matter where it goes.
thug_immortal you have some pretty f%$ked up ideas on BOV's.
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Location:
Camden, NSW
Registered:
June 2002
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Re: BOV with horn
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Fri, 02 July 2004 00:40
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maybe i do, but my theory hasnt been proven wrong yet.
The back pressure would hardley make it back through the turbine housing itself as compressed air is meeting compressed air causing both to go nowhere. Maybe it allows for better turbine response but i am talking about it doing nothing to fail the turbo, that is all i am saying. It does NOT prevent turbos from failing, turbos fail from many things and yes maybe air going back into the turbo the opposite way COULD have a SMALL inpact, it is nowhere near the amount that you all say it is. Its just a theory, and i have no evidence to back it YET, but i would say in another 6months when my mates car is still running and we pull the rubo off and inspect it, that it will all look perfectly normal and function as it would on a car with a BOV. We will be comparing it to the same turbo off a same model car that used a bov to compare results.
I dont care if you dont agree or you think im totally F#$ked up, the point is this is what i believe and i have not seen anything sofar that will prove me wrong. I dont say you guys are wrong either because if my findings show that you were correct, i will the first one to say, Well you were right. Im not having ago at any1 but this is a forum to voice oppinions and this is mine, so please dont attack me or my ideas as only time will tell.
Cheers,
Scott
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Location:
Parramatta
Registered:
July 2002
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Re: BOV with horn
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Fri, 02 July 2004 00:52
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| Quote: |
BOV's are useful devices and they have their place, but in 99% of cases the factory BOV (which is nearly always silent) is more than sufficient.
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this isnt so true... It is if the car is still running at std boost, but when the is upped a resonable amount the BOV spring is alot weaker then aftermarket ones, so the larger amount of pressure will cause boost leaks because the std springs are not made for the boost being applied, this is why ppl get aftermarket BOV... sure u can get a plum back but these seem to cost a little more in price hence the reason i have pfssst noise, and others im sure as well. So its not all wank factor!
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Location:
Lost in the K hole
Registered:
May 2002
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Re: BOV with horn
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Fri, 02 July 2004 01:31
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| thug_immortal wrote on Fri, 02 July 2004 10:40 |
i would say in another 6months when my mates car is still running and we pull the rubo off and inspect it, that it will all look perfectly normal
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mmmmm, 6 month trial, sample size of 1... just feel the statistical powah!!
i reckon you could publish a paper with those results
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Location:
sunny coast, qld
Registered:
October 2002
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Re: BOV with horn
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Fri, 02 July 2004 03:09
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Personally, I wouldn't be taking my BOV off if there is a remote chance of my turbo blowing because of it just to prove a point
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Location:
Brisbane
Registered:
May 2002
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Re: BOV with horn
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Fri, 02 July 2004 04:14
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It's unlikely the absence of a BOV will cause catastrophic turbo failure (ie bits breaking), it's more of a longevity thing. The bearing inside your turbo isn't good at handling thrust loads, which is what it will be exposed to when it gets hit by a shockwave bouncing off the throttle plate. Repeated thrust load = shaft endplay = rebuild time.
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Location:
Perth
Registered:
October 2003
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Re: BOV with horn
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Fri, 02 July 2004 04:50
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Youd probably find that that same shockwave would apply all sorts of unbalanced forces to the compressor, causing the shaft to vibrate which also isnt cool for bearing longevity, which inturn isnt good for compressor blades and compressor housings.
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Fri, 02 July 2004 15:39
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I can understand thug_immortals point of view but i would recon that drag/race cars dont use BOVs cause the motor and turbo gets rebuilt after the race anyway, also the speed in gear changes is split seconds in racing and therfore i hardly think there would be time for back pressure.
in regards to back pressure i would believe that it would cause some issues (maybe not major ones) cause if you take into consideration reflection and refraction then i would assume this:-
pressure from turbo going to plenum is X PSI, when throttle closed then that pressure would hit closed throttle and therefore reflect/refract back at same X PSI. now although there is still pressure going towards plenum even during closed throttle/gear change all that will do is slow down the rate of back pressure, but because the back pressure theoretically would be higher than the pressure that the turbo would be extracting to plenum (& possibly reducing as turbo spin slowing down) during the change it is possible that it could reach the turbo before gear change and boost/pressure increase can occur and therefore damage may happen. the damage would not be to turbo but rather seals.
think of it like this if you can; car in first gear, car rolling back and you rev dump first. yes very nice smoke show  but not good for diff... same concept with turbo and therefore BOV would relieve that back pressure to prevent seals getting F!@#$D
also hence quick shift no BOV required (turbo reaches boost before back pressure has time to make it back to turbo)
but like thug_immortal thats my opinion.........
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Fri, 02 July 2004 15:45
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quick shift no bov required. but how about when the throttle is snapped shut. ie . slowing down
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Sat, 03 July 2004 02:55
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i see your point but what i said is my opinion. i would love to know the 'TRUTH' bout the BOV but speculation keeps people going
as for throttle being snapped shut, well actually it never is 'SHUT' to its entirty, if it was the the engine would suffocate and turn off but rather it is closed to a degree where the fuel being fed and air taken are not sufficient to make the car move to its potential.
but i would assume that there would be some type of valve that will allow the back ressure to go out the exhaust instead of going back through the turbo. i dont know though i have never opened a turbo to see inside or anything, hell i didnt even know how turbos worked till i decided to get one
i would like to know the results of thug_immortals mates trial of no BOV. HEY MAYBE YOU CAN POST THE RESULTS OF WHAT HE FOUND WHEN HE IS DONE FOR US ALL TO SEE/READ
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Location:
Brisbane
Registered:
May 2002
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Re: BOV with horn
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Sat, 03 July 2004 13:49
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I give up.
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Location:
Adelaide
Registered:
June 2003
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Sun, 04 July 2004 05:05
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OK after reading the first 2 pages of the above link from lang i couldnt be bothered going any further and am not going to get a BOV... but will look into a sick arse WG
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I supported Toymods
On probation
Location:
Brisbane, Queensland
Registered:
January 2003
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Sun, 04 July 2004 06:11
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OOOOOOOOOPPPPPPPPPPPSSSSSSSSS
TYPO!!!!!!!!
I MEANT NOT GET A BOV!!!!!!!!!!!!!!!
just get a good waste gate
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I supported Toymods
On probation
Location:
Brisbane, Queensland
Registered:
January 2003
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Re: BOV with horn
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Sun, 04 July 2004 06:13
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 if i'm wrong then i will print this text and eat it, but a BOV and a waste gate perform two completely differenet functions....
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Sun, 04 July 2004 06:23
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ok now i am confusing myself... like i said in both posts i do not want a BOV, they seem to do nothing other than the noise they give off...
once again NO BOV for me...
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Location:
Sydney
Registered:
June 2004
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Sun, 04 July 2004 08:11
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a waste gate and a bov do completely different things.
wastegates are used to control boost
bov vents excess boost pressure
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Location:
Newcastle
Registered:
April 2003
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Re: BOV with horn
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Sun, 04 July 2004 09:27
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Well i reckon an aftermarket BOV is a waste of money on a std car.But even on a modded car it will still let all the boost out thus increasing turbo lag between changes.
The only reason everyone has one is cause the mags told them they need this.Create a market and then fill it,what a good way to make a heap of money from all the broz out there.
Just my 2.2 cents worth.
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Location:
Sydney
Registered:
June 2004
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Re: BOV with horn
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Sun, 04 July 2004 10:09
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its actually 5c these days (2c no longer exists hahahahaha)
can you get an After Market plumback one?
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: BOV with horn
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Sun, 04 July 2004 10:26
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| M.J.H wrote on Sun, 04 July 2004 17:27 |
Well i reckon an aftermarket BOV is a waste of money on a std car.But even on a modded car it will still let all the boost out thus increasing turbo lag between changes.
The only reason everyone has one is cause the mags told them they need this.Create a market and then fill it,what a good way to make a heap of money from all the broz out there.
Just my 2.2 cents worth.
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Wrong it would decrease turbo lag. stock bov's get old and worn out and start to leak.
and yes u can ge aftermarket plumback
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