blow off sound in brumby
- brumby_pete
- Junior Member
- Posts: 18
- Joined: Mon Jan 28, 2008 9:19 pm
- Location: Gold Coast, QLD
blow off sound in brumby
i put a $75 cannon on the brumby for shits and giggles and it sounds that good its not funny. really didnt expect it to sound so good. when im being a tosser and rev her right up and let off the throttle really quickly i get this blow off valve sorta sound. it only happens if i really rev her up though. ive looked around the engine bay to see if i could find anything and i found a valve thing inside the air box inside the section the oval filter encloses. i dont have any probs with it but i'd like to know why it does it. its only happened since i put on the cannon so i dont know. any ideas on what it is would be awesome.
Cheers.
Cheers.
- Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
So obviouslly you dont have an EA81Tbrumby_pete wrote: i found a valve thing inside the air box inside the section the oval filter encloses.
Cheers.
The valve is something to do with emissions, i doubt it would make the noise.
As said above, probably small backfiring in the exhaust
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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- Sti_Brumby
- Junior Member
- Posts: 20
- Joined: Tue Jan 24, 2006 10:00 am
- Location: Bundaberg
when i was putting my weber on my brumby i took all the emission contorl stuff of one by one, there is a vacume hose that gose to a valve caled an anti-backfire valve when you disconect one side of it and rev the car it would make a blow off sound, maybe one off these hoses have come off,
![Image](http://img230.imageshack.us/img230/2140/car2editej6.jpg)
its up around here...
![Image](http://img230.imageshack.us/img230/2140/car2editej6.jpg)
its up around here...
84 MY Sportswagon
92 Brumby
87 Rx Turbo
92 Brumby
87 Rx Turbo
- brumby_pete
- Junior Member
- Posts: 18
- Joined: Mon Jan 28, 2008 9:19 pm
- Location: Gold Coast, QLD
ok ive done some serious reving haha and its not that sort of sound at all. its more like a constant gush of air. it continues to have the gushing sound if i keep it around the redline area. i think i called it a BOV sound cause i only kept the revs that high for a moment. another thing ive noticed is when im in third and i slow down by going into second and just let the compression slow me down, particularly in second, i get that crackling quick popping noise and it does it heaps of times before it gets to low revs and it stops. that particular sound reminded me of an anti-lag system. a cop actually pulled me over yesterday to check if it was a turbo. (not allowed to drive turbos as im on the new P plate laws). what might these sounds be???Alex wrote:you need to put some resonators in your system. Is it like a crackling really quick popping noise?
alex
cheers.
- Sti_Brumby
- Junior Member
- Posts: 20
- Joined: Tue Jan 24, 2006 10:00 am
- Location: Bundaberg
I get the same backfire and gush of air in my car but its an ea82, but i have done nothing to the exhaust. Ive always wondered wat it was.brumby_pete wrote:ok ive done some serious reving haha and its not that sort of sound at all. its more like a constant gush of air. it continues to have the gushing sound if i keep it around the redline area. i think i called it a BOV sound cause i only kept the revs that high for a moment. another thing ive noticed is when im in third and i slow down by going into second and just let the compression slow me down, particularly in second, i get that crackling quick popping noise and it does it heaps of times before it gets to low revs and it stops. that particular sound reminded me of an anti-lag system. a cop actually pulled me over yesterday to check if it was a turbo. (not allowed to drive turbos as im on the new P plate laws). what might these sounds be???
cheers.
simply because you said it does it at high revvs when downshifting makes me think you need a resonator for SURE! my car use to do it.
i'll go make a quick vid of my car now![Smile :)](./images/smilies/icon_smile.gif)
alex
i'll go make a quick vid of my car now
![Smile :)](./images/smilies/icon_smile.gif)
alex
my07 Outback
my13 Hyundai i45(shhhh)
my02 Gen3 Liberty limited ed.
previously
L-series wagon, LSD, EJ20turbo, 29in tyres, 'wanky wagon'
2000 gen3 outback, lifted, otherwise stock.
my13 Hyundai i45(shhhh)
my02 Gen3 Liberty limited ed.
previously
L-series wagon, LSD, EJ20turbo, 29in tyres, 'wanky wagon'
2000 gen3 outback, lifted, otherwise stock.