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Location:
Canberra
Registered:
October 2002
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recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 07:19
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Hey guys, my parents are gonna get me a BOV for my b'day which is coming up and i was looking for some help as to which type or brand. i much prefer that "chicka chicka chika" sounding type than the sneazers. are tehy actually different types or does it just depend on rpm and boost? will it stuff around with my oxygen sensors or afm or anything else? what kind of prices am i looking at?
I'm not looking for anything conspicously loud, nor inconspicuously quiet, just somewhere in the middle.
cheers guys.
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Location:
sydney
Registered:
July 2004
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Re: recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 07:43
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that chicka chicka chika sound is actually intake noises cause from a large fmic. try a gfb sealth bov as they are both external and plumb back
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Location:
Canberra
Registered:
October 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 09:42
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Really? i didnt know a front mount had that kind of effect?
Obviously stealth is kinda quiet, correct?
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Location:
Elwood, Melb
Registered:
August 2003
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Re: recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 10:49
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ummmm that noise is actually the wastegate, and yes definately get the plumb-back, it makes no noise as its not atmosperic (excuse spelling)
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Location:
Adelaide
Registered:
May 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 12:45
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Instead of a BOV for your birthday, how about getting your parents to organise a McDonalds b'day party with ice cream cake...
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Location:
Brisbane
Registered:
February 2003
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Re: recommended BOV for 3SGTE (pretty stock)
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Wed, 14 July 2004 13:00
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oh snap
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Location:
South Australia
Registered:
July 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 00:11
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Get a plumb back otherwise you will start to confuddle your ECU  (not in any dramatic way mind you, just results in the occasional bit of unburned petrol hitting your turbo and igniting)
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Location:
sunny coast, qld
Registered:
October 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 00:15
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how can a turbo ignite petrol?
from what I have seen the unburnt petrol passes through the turbo and out the exhaust in a cloud of black smoke
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Location:
south east - melbourne
Registered:
March 2004
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Location:
South Australia
Registered:
July 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 00:32
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It's actually not that common, usually there isn't enough (or any) oxygen left to ignite the fuel straight away in the turbo, however it will vapourise VERY quickly and as soon as it gets towards the exit of the exhaust it will probably ignite/combust if/when it gets access to oxygen if the temperature of the exhaust is high enough.
Sorry - my bad!
That cloud of black smoke you see is actually carbon, not unburnt petrol - carbon is a result of the engine running rich and achieving imperfect (yet complete) combustion. Unburnt petrol (vapour) will result from imcomplete combustion, and will occur with either rich or lean mixtures.
If you are getting incomplete combustion in a turbo engine then you may notice pops and bangs. Such 'dramatic' levels of incomplete combustion are fairly rare (from my understanding) and only occurs in very poorly tuned engines.
A BOV usually operates when you lift off the throttle - meaning that your engine will usually retard the timing (there are other factors regarding modern ECUs timing I know). The pressure level in the intake manifold will drop - but the MAP or AFM will tell the ECU that there is still tonnes (in the case of a MAP, many metres cubed in the case of AFM) of air flowing through the intake manifold. The ECU delivers 'x' amount of fuel given the amount of air it thinks is going through the engine.
Due to the (likely) change in timing and the excess fuel (rich mixture) chances are incomplete and imperfect combustion will occur resulting in oxygen and fuel heading off merrily towards the turbo. Chances are also that this mixture heading towards the turbo is also 'rich' (lower than 16:1 air/fuel ratio) meaning there will likely be a puff of black smoke as well out the back of the exhaust.
To all those who know more about this kind of stuff than me, feel free to 'fine tune' my statement  (ie - I've got my flamesuit on, so fire away guys)
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Location:
W.A
Registered:
May 2004
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 01:02
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HEy!
I think that "chika chika chika" sound you want is not a BOV.
This sound comes from engines without a bov and without an air flow meter (ie MAP sensored).
The sound comes from air rushing back through the turbo the opposite way when the throttle body is closed.. You wont be able to hear it with an afm installed (as it will simply close and block the airflow in the opposite direction when the throttle is closed).
I dont know about the 3sgte, but i know this is the case on MAP sensored ET Pulsars and 4agtes...
So if ur 3sgte has an afm, convert it to MAP sensored and you should get this sound.
 I THINK this is right, can anybody confirm this?
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Location:
Brisbane
Registered:
July 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 01:05
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| d-shiznit wrote on Thu, 15 July 2004 11:02 |
HEy!
I think that "chika chika chika" sound you want is not a BOV.
This sound comes from engines without a bov and without an air flow meter (ie MAP sensored).
The sound comes from air rushing back through the turbo the opposite way when the throttle body is closed.. You wont be able to hear it with an afm installed (as it will simply close and block the airflow in the opposite direction when the throttle is closed).
I dont know about the 3sgte, but i know this is the case on MAP sensored ET Pulsars and 4agtes...
So if ur 3sgte has an afm, convert it to MAP sensored and you should get this sound.
I THINK this is right, can anybody confirm this?
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he is right!
but who gives a fuck what sound ur car makes, really!.. just get something that performs well an be happy with it
as for not hearing plumb back BOV's.. mine are plumb back and you can still hear them..
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Location:
South Australia
Registered:
July 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 01:17
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Yeah - you can hear a plumb back - and furthermore the ENTIRE point of BOV is to reduce the 'chika chika' sound to increase the life of the turbo (compressor surge is bad). As stated in that thread that was referenced earlier, grab a hks (or other brand) sequential bov if you are after that particular 'sound'.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 02:30
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GFB Hybrid
GFB plumb back
GFB Stealth
Turbosmart plumback
Stealth is the most costly ..
Im thinking of going the GFB hybrid or Plumb back on my Gt4 ..
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Location:
Brisbane
Registered:
May 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 06:05
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If you want a large plumb-back BOV which performs well, doesn't leak, flows enough for nearly any engine, and doesn't make annoying noises, I can provide contact details for the bloke who built mine. Less than $200 brand new with any flange type you require.
On the other hand if you just want to make annoying noises, you are ghey.
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Location:
Perth, WA
Registered:
February 2003
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Location:
Elwood, Melb
Registered:
August 2003
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 09:49
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hehe the good ol' bosch BOVs, you cant go wrong especially for a stock 3sgte, thats no doubt a good option and a money saver.
As for the what d-shiznit wrote about the compressor wheel slowing down and makin the so called "chika chika" noise when the throttle is closed, isn't this due to the wastegate, BOVs and wastegates work differently, BOVs release pressure in a sudden rush where as wastegates release pressure via slowing the compressor wheel down, thats why investing in a BOV can usually maximise the lifespan of a turbo, most if not all turboed engines come with a stock WG. Someone please discribe this in better detail or correct me so I might get a better understanding.
NO NOISE IS GOOD NOISE!!
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Location:
sydney
Registered:
July 2004
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Re: recommended BOV for 3SGTE (pretty stock)
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Thu, 15 July 2004 11:53
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if ur in sydney ill sell u the one which came with my car as i hate the bov sound. its an external one and makes big sound even at low boost.
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Location:
Canberra
Registered:
October 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Fri, 16 July 2004 02:52
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where in sydney?
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Registered:
May 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Fri, 16 July 2004 03:48
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As said above, go the bosch plumb-back BOV, flows well and is killer value! I have used one plumbed to recirculate and later to vent and it worked well. I know of a particular 8 second car in Canberra that uses more than one on his car (more than one to achieve greater flow, my turbo could just about sit in the bell mouth of the turbo this thing uses!!). So apart from not looking trick ie polished/anodised aluminium they are quite good.
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As for the what d-shiznit wrote about the compressor wheel slowing down and makin the so called "chika chika" noise when the throttle is closed, isn't this due to the wastegate, BOVs and wastegates work differently, BOVs release pressure in a sudden rush where as wastegates release pressure via slowing the compressor wheel down, thats why investing in a BOV can usually maximise the lifespan of a turbo, most if not all turboed engines come with a stock WG. Someone please discribe this in better detail or correct me so I might get a better understanding.
NO NOISE IS GOOD NOISE!!
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I am not getting into the whole noise thing again as this was discussed a couple of days ago in another post at length.
But just to clarify that the wastegate allows exhaust gas to BY-PASS the turbo exhaust wheel when the wastegate is partially-open to fully-open, thus less gas is passing through the exhaust wheel and it's rpm is limited, and because it is solidly attached to the compressor wheel boost is limited.
The only noise a wastegate makes is a slight increase in exhaust noise when open (very very very little in most cases, usually just noticeable inside the car to a keen ear) or if a "screamer pipe" arrangement is in place on an external wastegate a large amount of extra un-muffled exhaust noise is created.
I have only ever seen one car with no wastegate, the owner had simply welded the wastegate shut and let the car do it's thing  Not a great idea I don't think, it sounded rather unhealthy on the dyno.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: recommended BOV for 3SGTE (pretty stock)
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Fri, 16 July 2004 04:14
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| ke382TG wrote on Fri, 16 July 2004 13:48 |
I have only ever seen one car with no wastegate, the owner had simply welded the wastegate shut and let the car do it's thing Not a great idea I don't think, it sounded rather unhealthy on the dyno.
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also, The Rajab's I think it was use BOV's for boost control instead of wastegates. Whole other topic though
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Location:
sydney
Registered:
July 2004
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Re: recommended BOV for 3SGTE (pretty stock)
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Fri, 16 July 2004 09:00
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im in ashfield (inner west). u can even drive the car to c if u like the sound.
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