Ok, this may have been suggested before but.....

 

Goosehonk comes about when an aftermarket filter is fitted. This is because the new filter is far less restrictive and allows the air blown into the intake tract by the recircs, to blow back past the MAS and out of the filter. This doesn't happen with the stock airbox as it is far more restrictive. Replacing the recircs will not cure the problem - maybe fitting faulty seized ones will though ;)

 

So, infact, the recircs are not even doing their job - the whole idea is to retain the air in the system once it has passed the MAS (its been measured into the engine so the ecu will fuel for it). So, what's your excuse for not buying BOVs now eh??? :D:D:D

 

Any thoughts?

 

CheerZ,

 

Andy

Because BOV's sound crap and add nothing. :p Lax Power mod, IMHO. :D :D ;)

nah, theres only one thing which sounds better than a BOV. Thats a big rumbling yank V8 ;)

Says 300zx.co.uk's youngest ambassador LOL BOVs dump the air far quicker than a recirc. The quicker the air is dumped, the less compressor surge, the lass lag when you go back on the throttle. So in effect, it DOES improve performance... IMHO ;) :p :D

 

CheerZ,

 

Andy

could someone knock up a simple schematics of the air flow and position of these valves in relation to the turbo etc, nothing complex, just would like to have an idea where all this hot air is going.

Originally posted by andyduff

Ok, this may have been suggested before but.....

 

Goosehonk comes about when an aftermarket filter is fitted. This is because the new filter is far less restrictive and allows the air blown into the intake tract by the recircs, to blow back past the MAS and out of the filter. This doesn't happen with the stock airbox as it is far more restrictive. Replacing the recircs will not cure the problem - maybe fitting faulty seized ones will though ;)

 

So, infact, the recircs are not even doing their job - the whole idea is to retain the air in the system once it has passed the MAS (its been measured into the engine so the ecu will fuel for it). So, what's your excuse for not buying BOVs now eh??? :D:D:D

 

Any thoughts?

 

CheerZ,

 

Andy

 

If this is true, why is there that putting something as simple as a large scotch tape at the bottom of the air filter will solve this (non - existent) problem ?

The recircs feed from the high pressure side of the turbo, after the intercooler, to the air inlet between the MAS and the turbo. The air that is dumped back into the intake before the turbo, ready for heating again, has already been through the turbo once, so is above the ambient air temperature. Yet another reason for fitting BOVs!!! :D

Originally posted by H Le Hir

If this is true, why is there that putting something as simple as a large scotch tape at the bottom of the air filter will solve this (non - existent) problem ?

 

Therefore restricting the intake once more......

Originally posted by andyduff

The recircs feed from the high pressure side of the turbo, after the intercooler, to the air inlet between the MAS and the turbo. The air that is dumped back into the intake before the turbo, ready for heating again, has already been through the turbo once, so is above the ambient air temperature. Yet another reason for fitting BOVs!!! :D

 

so when u come of gas its a means for the high pressure to escape thus prevent stalling of the turbos? but wouldnt bov's cause all the pressure to be lost were as the recirc try to recycle the air keeping the turbos spining

I have to agree with Ajay on this.

 

I must admit that I was impressed with Luke Dukesters HKS BOV's, but to get all excited about a noise? Come on! FFS!

 

Stock recircs are good for 600+ bhp but as I've said over and over since joining this forum...you wanna blow 500 squids to get a stupid whooosshhhhhh, pssstttttttt sound then that's upto you. ;)

hmm, i seem to remember a discussion about you buying BOVs a while back timmy, felt quite strongly they would not be a waste of money to put on an auto ;) ;)

:p :D

Originally posted by andyduff

Ok, this may have been suggested before but.....

 

Goosehonk comes about when an aftermarket filter is fitted. This is because the new filter is far less restrictive and allows the air blown into the intake tract by the recircs, to blow back past the MAS and out of the filter. This doesn't happen with the stock airbox as it is far more restrictive. Replacing the recircs will not cure the problem - maybe fitting faulty seized ones will though ;)

 

So, infact, the recircs are not even doing their job - the whole idea is to retain the air in the system once it has passed the MAS (its been measured into the engine so the ecu will fuel for it). So, what's your excuse for not buying BOVs now eh??? :D:D:D

 

Any thoughts?

 

CheerZ,

 

Andy

 

Cos my recircs work ;)

Yeah I did get all excited for all of 5 minutes while being driven around in Lukes car. Then I woke up and realised how annoying that noise would be after a further five minutes of driving around.

 

Do another search Stu and find the post/thread where I told the story of some geezer behind me in an Escort RS Turbo, that annoyed me more! LMFAO :D

Yeah, just found it. I wonder why he didnt try it when you aproached the dual carrage way.

 

I know some one who has HKS I think BOVs and his and they sound nasty. Like a bus ! :confused:

 

Did any one ever see that sound box you put in your engine bay which plays the BOV sound when you release the throttle? I heard a Nova with one of them on. I couldnt stop laughing.

 

One mate of mine was saying that he didnt know what people with the goose honk where complaining about when it occured. We heard a NSX Turbo which had a goose honk and he thought it sounded different and not so bad. His car does it and he now says it's annoying as hell.

 

I'm with you Timmy, BOV's are just for the sound and I personally am not bothered about them. If I got my Z with BOVs fair enough, but I didnt.

 

There are a few and I mean a few, boy racer cars with BOVs on round here, and let off the accelerator for no reason to hear the sound.

Originally posted by andyduff

Therefore restricting the intake once more......

 

Nope, shaping the air flow in a laminar way, that's not exactly the same thing.

 

And BTW, it works on single air intakes, and on double air intakes...

 

And beleive me.....BOV are an excellent way to

 

1st make your engine run rich

2nd make your engine run lean (when the ECU finds about 1st)

Ok understood on the tape. The rich/lean conditions though, surely if the air from the recirc isn't actually staying in the system, then they are just acting the same as BOVs???

 

CheerZ,

 

Andy

My take on what causes goosehonk is a little different - though it's really just guesswork..

 

I imagine'd that the springs slowly go weak in these things (as springs do), so over time they no longer open & close 'properly' or quickly.

 

The sound you're actually hearing could, therefore, be air blowing across the 'top' of the aperture in the recirc - just like blowing across the top of a milk bottle.. If you think about it - the sound is pretty similar (albeit a damned sight louder)..

 

P.S. I thought the duct-tape fix was just for stalling when decellerating, because the flow of air into the intake went around the MAF hotwire, rather than over it?

 

P.P.S. I also understand why the car will run rich as the BOV's vent the (already metered) air to atmosphere, but why would it then run lean? You're almost certainly going to be well above idle, which means the ECU is ignoring the O2 sensors, and has no way of telling if the engine is lean or rich - it's simply running off the stored fuel maps? At least that was my take on things...

Right I can settle this one............eventually! Ive fitted Turbo XS recircs, which can be run as either,when I get the car set up on the dyno Ill get it set up first as BOV's then as recircs to see if and what difference it makes to the power curve across the rev range. Currently running as BOV's, I dont find the noise too irritating, and anyway you can drive it to make a noise or not!

 

Tssssssschhhhhh!:D

I don't think it'll affect the power curve on a standard test.

 

What would be interesting would be a quick 'off-on' throttle blip at around 4,000 revs during a run.

 

Dave

I have to say that I had the dreaded honk both before and after fitting Blitz SUS induction...I have noticed the honk to coincide with a lull in power delivery.

 

Cheers!!

 

RobH

duffa is right in you need bovs to remove the goose honk

 

 

its got something to do with ,in the chamber where the recircs is there is supposed to be something like 28 psi built up from the air flow going in and being discharged from the back flow.

 

i posted a post ages ago from a tech file i found on ttnet,where this had been really discussed

 

my goosehonk started after i put my new zorst on and increased my boost,a year after my new airfilter went on my car.

 

the recircs ,so ive been told are only made for ave 9 psi .

ive tried changing the recircs with no look at all.

 

sorry guys love em or hate em but bovs is ya only choice and from what ive read there still is no quarrantee that they are gonna work also.

Rally cars used to use dunmp valves ... now they use recir dump's is that not correct !!!!!

 

Toyota Subaru pug arent gonna spend millions on they're cars and stick on something that don't work are they ?

Originally posted by Clarkey

hmm, i seem to remember a discussion about you buying BOVs a while back timmy, felt quite strongly they would not be a waste of money to put on an auto ;) ;)

:p :D

 

Tim is like that bloke on the 'Fast Show', the fella in the pub who cant make his mind up and contradicts himself all the time.

 

'I love that BOV sound'

'What about all those RS Turbos? you want to sound like that'

'No, I meant on a 300zx'

'But you just like, said man, you like the dump valve hiss'

'Nah its crap you're right I dont want that'

'But what about Macca's car that sounds ace'

'Yeah its great I am gonna get some HKS SSQ's love em, always said they sound great on a 300zx, but not a skyline though'

'what about the boyracer tag with dumpvalves'

'Yeah Ive always said they are for maxpower tits, hate em meself'

'er ok'

'er oh, erm, did I tell you about the time in the Gulf War when I was on HMS Disasterous and we made safe 4000 mines ECU's in the Red Sea. Well proud of that me. erm .. Macca .. hit im will ya'

Originally posted by scott zx_9r

Rally cars used to use dunmp valves ... now they use recir dump's is that not correct !!!!!

 

Toyota Subaru pug arent gonna spend millions on they're cars and stick on something that don't work are they ?

 

 

Yep, and CHAP car or INDY car or what ever the hell they call it, are turboed and dont use BOV's.

 

Do the Ferrari F40 and F50 use BOV's? I dont think they do. I have heard vids of F40's and I dont remember hearing one.

 

I dont think Lotus uses BOV's or Noble.

 

Stuart

Originally posted by senna

Tim is like that bloke on the 'Fast Show', the fella in the pub who cant make his mind up and contradicts himself all the time.

 

'I love that BOV sound'

'What about all those RS Turbos? you want to sound like that'

'No, I meant on a 300zx'

'But you just like, said man, you like the dump valve hiss'

'Nah its crap you're right I dont want that'

'But what about Macca's car that sounds ace'

'Yeah its great I am gonna get some HKS SSQ's love em, always said they sound great on a 300zx, but not a skyline though'

'what about the boyracer tag with dumpvalves'

'Yeah Ive always said they are for maxpower tits, hate em meself'

'er ok'

'er oh, erm, did I tell you about the time in the Gulf War when I was on HMS Disasterous and we made safe 4000 mines ECU's in the Red Sea. Well proud of that me. erm .. Macca .. hit im will ya'

 

ROFL :D

 

I dunno, this from the Ford Capri Ghia of the Skylark owners world! :D

 

Don't they like you on the GT-R forum???

 

Keep it coming Senna Jameson, I find this highly amusing...honest!!! :D :D

Originally posted by senna

Tim is like that bloke on the 'Fast Show', the fella in the pub who cant make his mind up and contradicts himself all the time.

 

'I love that BOV sound'

'What about all those RS Turbos? you want to sound like that'

'No, I meant on a 300zx'

'But you just like, said man, you like the dump valve hiss'

'Nah its crap you're right I dont want that'

'But what about Macca's car that sounds ace'

'Yeah its great I am gonna get some HKS SSQ's love em, always said they sound great on a 300zx, but not a skyline though'

'what about the boyracer tag with dumpvalves'

'Yeah Ive always said they are for maxpower tits, hate em meself'

'er ok'

'er oh, erm, did I tell you about the time in the Gulf War when I was on HMS Disasterous and we made safe 4000 mines ECU's in the Red Sea. Well proud of that me. erm .. Macca .. hit im will ya'

 

 

Ive gotta say, Glen that is effing funny, but can you please stop, if I laugh too much my intestines might pop out!

 

:D