howhow82 Posted July 22, 2003 Share Posted July 22, 2003 Hi everyone, as mention in the subject, i just bought a blow off valve from autobarn. I noticed there is a "Tight" and "Loose" on top of the valve. What is the purpose of it? Cause as u can tell i am totally newbies for high performance car. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/ Share on other sites More sharing options...
Lozza150 Posted July 22, 2003 Share Posted July 22, 2003 more or less noise basically...... tighten it up and the turbo wil *Fluter* sssss suuu suu su s u su su loosen it and will more Pchhhhhh sound all depending on boost pressure of course...... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-441962 Share on other sites More sharing options...
YBSLO4 Posted July 22, 2003 Share Posted July 22, 2003 The screw aloows you to adjust hte spring tension. When you are running more bosot pressure you might find it starts to leak in higher rev's so you want to tighten the srping up, however if you are not running as much boost you want to loosen it off to ensure the BOV will be able to open. However they more adjustable nowdays for rice factor to get different sounds. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-443087 Share on other sites More sharing options...
redline2003 Posted July 23, 2003 Share Posted July 23, 2003 are they defectable??? Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444359 Share on other sites More sharing options...
Lozza150 Posted July 23, 2003 Share Posted July 23, 2003 Absolutely..... Noise factor i think...... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444391 Share on other sites More sharing options...
xRHETTx Posted July 23, 2003 Share Posted July 23, 2003 Yes BOV's are illegal because they change the cars emissions, make them run richer. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444534 Share on other sites More sharing options...
xRHETTx Posted July 23, 2003 Share Posted July 23, 2003 Unless they're plum back. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444536 Share on other sites More sharing options...
Guest RedLineGTR Posted July 23, 2003 Share Posted July 23, 2003 noise pollution..too Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444571 Share on other sites More sharing options...
Parag0n Posted July 23, 2003 Share Posted July 23, 2003 BOV's are illegal ? Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444595 Share on other sites More sharing options...
Lozza150 Posted July 23, 2003 Share Posted July 23, 2003 not sure if it differ's state to state but in NSW and Vic they are..... POD filter's and *Noisy* exhausts are too..... surprisingly Bogans in VN commodore's arn't...... Pity.... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444606 Share on other sites More sharing options...
Parag0n Posted July 23, 2003 Share Posted July 23, 2003 lol, well i see cars with VERY noisy BOV's cruising around on Sundays Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444612 Share on other sites More sharing options...
Lozza150 Posted July 23, 2003 Share Posted July 23, 2003 Mine's fairly quiet..... then agin it's only running 6 psi so..... need i say more.... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444615 Share on other sites More sharing options...
Hiroshima Screamer Posted July 23, 2003 Share Posted July 23, 2003 Originally posted by xRHETTx Unless they're plum back. so plumbs are street legal ? Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444624 Share on other sites More sharing options...
Lozza150 Posted July 23, 2003 Share Posted July 23, 2003 Plumb BACK.... yes.... GTR's might be different..... if they come with external venting BOV's as Standard..... I'm am unsure on GTR's.... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-444636 Share on other sites More sharing options...
YBSLO4 Posted July 24, 2003 Share Posted July 24, 2003 BOV"s are illegal for the reason being that they vent blow-by into the atmosphere... yes they can be noisey, yes they cause the car to run richer but its stated that they blow un-filtered air/oil into the atmosphere... stupid really, cos last time i checked the exhaust vented to atmo aswell?? But thats all good its only carbon monoxides and what have you, alot worse than the 'ocassional' mist of oil comin from a BOV. P.s. Don't forget BOV's if they aren't a good design will cause crappy throttle response, and having a atmo BOV means you must re-spool that released amount of air. They have their pluses and minuses. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-447453 Share on other sites More sharing options...
Steve Posted July 24, 2003 Share Posted July 24, 2003 As YBSLO4 mentioned BOVs are illegal if they vent to atmo, because cranck case gasses must exit the car via the exhaust, Road Traffic Act 1962 (from memory) in SA. These traffic laws are now pretty much consistant australia wide. So they MUST plumb back to be legal - like the stock one. As for adjusting BOV, tighter will mean it takes more (boost) pressure for the valve to lift. Yes it will make less noise, but the fluttering noise you hear is air reversing through the compressor, slowing the turbo down (increasing lag) and putting strain on the turbine - this isnt too good for obvious reasons. I adjusted mine by winding it back until the fluttering sound was almost gone. Almost, because if you wind it back too far, you may have the car stall at idle as it doesnt seal properly. Something to have a play with until you are happy. Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-447604 Share on other sites More sharing options...
Parag0n Posted July 24, 2003 Share Posted July 24, 2003 Do many people get busted around Oz for having noisy BOV's ? Is there a set limit in Decibels you can have it set to ? Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-447616 Share on other sites More sharing options...
Guest RedLineGTR Posted July 24, 2003 Share Posted July 24, 2003 vvvvrrrrrrrrrrrrrmmmmmmmmmmmm pppppppppppppssssssssssshhhhhhhhhh Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-447746 Share on other sites More sharing options...
Steve Posted July 24, 2003 Share Posted July 24, 2003 The only noise testing I know of that a car needs to be roadworthy has to do with the exhaust, this is done with the car at revs, and the EXHAUST is not to exceed 89dBs. This is conducted with the car at specific revs, not changing gear - so I am not sure how any copper gets away with defecting cars for excessive intake noise (how could it exceed 89dB?) or noisey BOV which wouldnt be measured if a car was being tested for compliance with noise regulations - only for atmo BOV or pod that doesnt comply with ADRs. I have heard of people claiming to be defected for this, and I would love to know exactly what regutation/act it is that they would be in breach of? Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-447836 Share on other sites More sharing options...
YBSLO4 Posted July 25, 2003 Share Posted July 25, 2003 I never heard of anyonr bein defective for a loud filter?? Fark if thats the case i am routed... Link to comment https://www.sau.com.au/forums/topic/21032-new-blow-off-valve/#findComment-449522 Share on other sites More sharing options...
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