Fair enough. I personally like the sound of plumb back BOVs more, I recon the best BOV noise I have heard is on a mates RS Liberty, with the standard valve, and a unifilter ram pod style filter. On shifts it made a noise like a big sigh, like it was just taking a breather for the next run.
On Mon, 28 Jul 2003, Reeves Cameron wrote: > I agree, all parts inside an engine are under stress, obviously some more than > others. I cant show you a turbo which has been damaged by the removal of a BOV, and > I sincerely doubt that anyone will be able to provide you with the undeniable proof > which you are after. > > Try spinning an engine at anything above 10,000rpm and chances are it wont be > running for too long. Turbos have to be made stronger because they do spin upwards > of 20-30'000 rpm. Chances are too that an engine will long outlive the life of a > turbo on that same engine. > > A 200SX BOV is designed to leak (there is a bloody great big hole in the middle of > it), and it is also NOT designed to control 3 and 4 fold increases in boost over the > original boost setting (std boost is 7 psi, not uncommon to see 20-24 psi with an > aftermarket turbo) - hence the relatively large aftermarket industry for BOV's. > These aftermarket bov's can decrease lag time, prevent leaking whilst under boost, > and ultimately, allowing your turbo to work less to reach the same boost. > > Dont get me wrong, I dislike externally venting/vent to atmosphere BOV's as much as > the next guy, but there are good reasons (see above) as to why an aftermarket > PLUMB-BACK bov (not the ones which make the big noises) can be a good purchase. > > As yet, the only reason I can see to buy an externally venting bov is for all the > rice boys to have some more noise and aid in attracting the police... > > > -----Original Message----- > From: Robert Charles Scealy [mailto:[EMAIL PROTECTED] > Sent: Monday, 28 July 2003 03:38 PM > To: [EMAIL PROTECTED] > Subject: RE: BOV Sounds > > > I will buy the argument that BOVs, in particular ones that plumb back > into the inlet, will help to decrease lag etc pretty easily. About the > slowing down of the turbine though, I will need more convincing (a > broken turbo would be very convincing!). I accept that it will cause > some ammount of stress, but it is hard to think of a mechanical part in > a car that isnt under stress, otherwise there would probably be little > use for it being there. What about valves - they are pounding up and > down 1000s of times a second, being belted open by a cam and smashing > thier way back down on a seat, and they will often last the lifetime of > a motor, and they have to deal with metal-metal contact, where turbos > only have to deal with metal-air (except for bearings). > Also, even when you are under full throttle the air passing through the > intake of the turbo is always trying to slow it down, while the exhaust > turbine is trying to spin it much faster. > Like I said though, I could be completely wrong - and if someone does > indeed have a broken turbo that they can _only_ attribute to the lack of > a BOV I will certainly eat humble pie. Comes down to a basic distrust of > advertising in the aftermarkets parts industry I guess. > > On Mon, 28 Jul 2003, Reeves Cameron wrote: > > > anything which tries to stop something turning at 10's of thousands of rpm is > > going to stress on that piece of mechanics. it will also severely hamper the > > performance of your turbo as more energy needs to be exerted to spin the turbo > > back up to the speed at which is was operating before it was asked to slow down... > > > > every late model turbo car that I can think of has a plumb-back bov. air is > > directed from somewhere near the intake plenum back into the pipe from the airbox > > to the turbo. > > > > vent to atmosphere bov's (which I think is the one you could be thinking of), are > > the noisy ones. these are illegal. > > > > > > > > -----Original Message----- > > From: Robert Charles Scealy [mailto:[EMAIL PROTECTED] > > Sent: Monday, 28 July 2003 02:46 PM > > To: [EMAIL PROTECTED] > > Subject: RE: BOV Sounds > > > > > > My old car used to do that with no BOV on closed throttle like you say. > > I have always been a bit dubious of the theory that air rushing back > > could damage a turbo though, has anyone ever had any damage that you > > could attribute to the lack of a BOV? I am no expert though, so I will > > quite happily hear arguments both ways. My main reasons for being a > > little dubious are: > > - If not having a BOV caused turbine damage, every factory car would > > have a BOV to stop warrany claims etc, but many have no BOV with no > > problem. > > - The only place in writing that I have read about BOVs preventing > > damage to a turbo is in advertisments for BOVs. > > > > On Mon, 28 Jul 2003, Reeves Cameron wrote: > > > > > with no bov you can probably achieve a similar sound. close the intake/off the > > > throttle and the air which would normally escape via the bov rushes back through > > > and hits the compressor wheel on your turbo... > > > > > > increases lag time and is a perfectly good way to break a good turbo to boot... > > > > > > -----Original Message----- > > > From: Geordie [mailto:[EMAIL PROTECTED] > > > Sent: Monday, 28 July 2003 01:59 PM > > > To: [EMAIL PROTECTED] > > > Subject: RE: BOV Sounds > > > Importance: High > > > > > > > > > He's looking for the chirp sound. I'd say that's just some sort of > > > whistle/trumpet type of BOV, prolly looking at a few hundred bucks to get > > > that dopey sound, but if that's what he wants then go for it. > > > Far better off without a BOV, pain in the ass to set up, they leak, etc.. > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] Behalf Of Ben > > > Sent: Tuesday, 29 July 2003 5:42 AM > > > To: [EMAIL PROTECTED] > > > Subject: Re: BOV Sounds > > > > > > > > > get rid of the BOV.....i dont have a BOV on my SR....she makes a CH CH CH CH > > > CH CH noise when u close the throttle > > > > > > ----- Original Message ----- > > > From: <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Sunday, July 27, 2003 7:30 PM > > > Subject: BOV Sounds > > > > > > > > > > Hi List, > > > > > > > > Does anyone know what the relation is between BOV type and sound? > > > > I have been asked how to get the 'pigeon' sound on a SR20 180sx. > > > > I think he means the fluttery sound that is NOT wastegate flutter. > > > > Supposedly you can get it by modifying the installation of a Turbosmart I > > > valve. > > > > > > > > Wierd question, I know, but hopefully someone will be able to help out. > > > > > > > > Thanks, > > > > Nick > > > > > > > > This message was sent through MyMail http://www.mymail.com.au > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ************************************************************************ > > > The information in this e-mail together with any attachments is > > > intended only for the person or entity to which it is addressed > > > and may contain confidential and/or privileged material. > > > Any form of review, disclosure, modification, distribution > > > and/or publication of this e-mail message is prohibited. > > > If you have received this message in error, you are asked to > > > inform the sender as quickly as possible and delete this message > > > and any copies of this message from your computer and/or your > > > computer system network. > > > ************************************************************************ > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
