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Location:
Coffs Harbour
Registered:
October 2004
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BOV echo ?
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Sat, 30 April 2005 13:26
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Allrighty then, ive put a deposit down on a turbo starlet and will be collecting early next w/e. Its stock apart from a aftermarket ecu. Anyways i was wondering which BOV does it or how you get the echo of the BOV venting, i'm sure youve all heard it at some point, its just the initial sound that echos a few times and gets quiter with each echo. Ive been told a few different things and as this is my first turbs car i have nfi. Any help appreciated thanks.
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Location:
Brisbane
Registered:
February 2003
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Location:
Coffs Harbour
Registered:
October 2004
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Re: BOV echo ?
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Sat, 30 April 2005 14:08
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ok, yeh one mate said it was the air going back the wrong way, next question is will this affect the turbo spooling, as from my understanding bovs are to help the turbo spool quicker an to decrease lag. Keep in mind this is a 1.3 turbo.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: BOV echo ?
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Sat, 30 April 2005 14:23
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BOV is anti spooling, ie keep it spinning when throttle is closed, by venting the pressurised air...
back to the books i think 
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Location:
Coffs Harbour
Registered:
October 2004
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Re: BOV echo ?
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Sat, 30 April 2005 14:33
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... so will performance be lost ?
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Location:
Newcastle
Registered:
May 2004
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Re: BOV echo ?
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Sun, 01 May 2005 01:06
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BOV's release pressure thats between the tarbo and mainfold, if not released this pressure goes back down into the tarbo, as explained by monkeymajik.
BOV's are designed to vent excess pressure that is not needed, and prevent it from flowing back to the turbo, this in turn is said to decrease your turbo's life, espicially if running lots'o'boost.
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Location:
Campbelltown
Registered:
November 2003
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Location:
Eastern Melbourne
Registered:
January 2005
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Re: BOV echo ?
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Sun, 01 May 2005 01:34
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I used to have a 13B turbo RX4.
when i first got it, it had some little stock rx7 BOVs that evidently did not work very well, if at all. those BOVs made that echo sound.
after about 1 month of owning the RX4 i had a Turbosmart v-port BOV fitted, when i picked up my car from the exhaust shop i was surprised at how effective it was! my car used to give a little squeak into second gear under hard throttle, but with the bov, it bagged hard into second and chirped third.
i talked to my mechanic, (Rotary Performance Center) and they told me it was because i had small diameter intercooler pipes, (about 2.5 inch i think) and the pressure bouncing back off the closed throttle would have been pretty harsh without a BOV, and would have slowed the compressor down considerably, meaning the engine has to build boost again after each time the throttle is shut,ie gear shifts.
basically, the BOV allowed my car to get back on boost almost immediately after a shift, this equals little-to-no lag into the next gear.
but I'm not sure about it being bad for a turbo, i spose if the turbo has to do more spooling it would have a harder life and wear out quicker.
Plus, BOVs are great for letting out a TSHHH next to the open window of a V8 falcodore to bait them for a race!
[Updated on: Sun, 01 May 2005 01:37]
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Location:
Coffs Harbour
Registered:
October 2004
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Re: BOV echo ?
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Sun, 01 May 2005 04:47
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ok thanks for all the help, seems as its best not to have that echo sound, tho i will have 2 spare turbos so i guess if one dies ill jus replace it
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