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Location:
Adelaide
Registered:
September 2003
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B.O.V. plumback restriction
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Tue, 03 May 2005 06:34
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this may sound really stupid but Im going to ask anyway.
I recently removed the air return pipe between my bov and airbox. This pipe will now vent to atmosphere. What I would like to know is if I reduce this pipe from 19mm down to 13mm before it vents to atmosphere, will this have any bad effects on anything?? The BOV is some little brass thing, no idea what type.
Cheers André
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Location:
Brisbane
Registered:
April 2004
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 06:37
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Not really but have you disconnected it already?
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Location:
Adelaide
Registered:
September 2003
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 10:45
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Yes the airbox has been removed and replaced with a pod style filter which is fed via ducting coming from the front of the car. The area is currently unsheilded but will be sheilded soon and a bonnet scoop of some kind will be added above it to direct more air to that region.
At the moment from the venting side of the BOV I have a small length of tube (approx 19mm ID) wich then reduces to 13mm and straight into a breather filter. (why u ask? just so it looks a little neater and hopefully is a little quieter)
The engine does not need to retain plumback for the afm as the car utilises a gas research carb and therefore there is no ecu.
I am unable to test this setup at the moment as the engine has no head. The Engine is an FJ20t
thanks
André
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Location:
On your mum!
Registered:
May 2002
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 10:51
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It will inhibit the performance if the BOV. This is eefectively reducing the discharge area by approx 50%, and it won't be anny quieter.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 13:24
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It probably makes MORE noise this way 
Either just stick a little air filter on the end of the valve, or weld somewhere into your intake pipe for it to go.
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Location:
south east - melbourne
Registered:
March 2004
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 22:43
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why was the bov venting back into the airbox in the first place , shouldnt it be nevted back after the afm and before the turbo so that the afm doesnt register the air it has previously registered ( bov return air )
another guy was telling me that the bov should be plumbed back into the airbox cause something about the plumbed back air contains c02 ( how the fcuk can c02 come into the inlet track i dont know)and the afm not metering the air cause its used and whatever , and if the bov is plumbed back after the afm it will make the car run rich ,
i wasnt taking too much notice of the convo cause i though he was talking shit when he started telling me that the bov needed to be plumbed back into the airbox
someone tell me that he was talking gibberish 
at that stage i didnt know what to do cause this dude is a mechanic and works for sports and luxury in melbourne
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Location:
Brisbane
Registered:
April 2004
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 23:35
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If you have a plum back with a afm on standard computer you can not disconnect it the car just won't run right you will not even make boost. We tried this out on my friends Vl and on a R32 skyline and they both did the same thing ran like shit the pipe should go between the afm and the turbo.
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Location:
south east - melbourne
Registered:
March 2004
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Re: B.O.V. plumback restriction
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Tue, 03 May 2005 23:51
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my car doesnt have abov from factory i just put an atmo one on , so the dude was saying it should be plumbed back -- which is faur enuf , but when he said it should be plumbed back into the airbox i was dumbstruck 
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Location:
Adelaide, SA
Registered:
May 2002
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Re: B.O.V. plumback restriction
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Wed, 04 May 2005 05:41
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Factory cars with MAP sensors plumb back to the airbox to reduce noise. an AFM car really needs it to happen after the AFM so it wont open..
Some people are so silly.
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Location:
Adelaide
Registered:
September 2003
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Re: B.O.V. plumback restriction
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Wed, 04 May 2005 06:02
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Indian:As I stated above
"The engine does not need to retain plumback for the afm as the car utilises a gas research carb and therefore there is no ecu." It was just plumbacked for noise reduction and for a more factory look originally.
I am getting very varied opinions on what will happen so far from friends and toymodders. I guess Ill just have to see what happens when the bird is back on the road.
MrShin: The pipe now connects to one of those dodge redline breather filters. Fitting that on the end was the reason for the size reduction. Plumbing back into the intake pipe sounds like a good idea though, cant believe I didnt even think of that.
Thanks again people
André
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