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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.

you need to put some resonators in your system. Is it like a crackling really quick popping noise?

alex

the best answer u culd get. is -

u have an EA81T with a BOV already on it

but i doubt it.


but yer i agree with Alex.

hey, how come the asterisk police let you spell shits clearly ?

brumby_pete wrote: i found a valve thing inside the air box inside the section the oval filter encloses.
Cheers.

So obviouslly you dont have an EA81T

The valve is something to do with emissions, i doubt it would make the noise.

As said above, probably small backfiring in the exhaust

it's not the anti - back firing vavle is it? top right hand corner.

My brumby used to make that noise

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,



its up around here...

must of been writing that at the same time, its pritty easy to find its mounted very high and has about a 20mm hose going into it on one side that i can remeber

Alex wrote:you need to put some resonators in your system. Is it like a crackling really quick popping noise?

alex

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.

free flowing exhuast tend to do that on the ea81's. Specially you have fitted a straight through cannon.

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.

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.

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

alex