Blow Off Valves
- Thread starter Skippy
- Start date
Re: Basic Questions - New
there is no concrete evidence on the theoretical damage, im not saying its not true, but i'll wait till they have conclusive research before i say... and so far for many years no proper research has crossed my eyes, so im now sceptical
also if this was the case car manufacturers who make OEM turbo cars would have diced it up and got into the technicals by now, and .: if it was tru they would be utilising silent/replumbed adaptations in OEMs these days to prolong turbo life
just my view, im sceptical but if hard evidence came out i would consider it
topgunjames said:
there is no concrete evidence on the theoretical damage, im not saying its not true, but i'll wait till they have conclusive research before i say... and so far for many years no proper research has crossed my eyes, so im now sceptical
also if this was the case car manufacturers who make OEM turbo cars would have diced it up and got into the technicals by now, and .: if it was tru they would be utilising silent/replumbed adaptations in OEMs these days to prolong turbo life
just my view, im sceptical but if hard evidence came out i would consider it
Re: Basic Questions - New
there is no concrete evidence on the theoretical damage, im not saying its not true, but i'll wait till they have conclusive research before i say... and so far for many years no proper research has crossed my eyes, so im now sceptical
also if this was the case car manufacturers who make OEM turbo cars would have diced it up and got into the technicals by now, and .: if it was tru they would be utilising silent/replumbed adaptations in OEMs these days to prolong turbo life
just my view, im sceptical but if hard evidence came out i would consider it
topgunjames said:
there is no concrete evidence on the theoretical damage, im not saying its not true, but i'll wait till they have conclusive research before i say... and so far for many years no proper research has crossed my eyes, so im now sceptical
also if this was the case car manufacturers who make OEM turbo cars would have diced it up and got into the technicals by now, and .: if it was tru they would be utilising silent/replumbed adaptations in OEMs these days to prolong turbo life
just my view, im sceptical but if hard evidence came out i would consider it
Re: Basic Questions - New
If companies who make turbos say that it helps, then how is that not evidence enough when they actually make and deal with the turbos? And a lot of cars do come with BOV as standard... Pretty sure the silvia, skyline, soarer, came with a stock BOV. And a lot of the time it isn't required since it's running minimal boost, but when you start hitting boost pressures of <10psi possibly <20psi you'll need one to prevent damage.
If companies who make turbos say that it helps, then how is that not evidence enough when they actually make and deal with the turbos? And a lot of cars do come with BOV as standard... Pretty sure the silvia, skyline, soarer, came with a stock BOV. And a lot of the time it isn't required since it's running minimal boost, but when you start hitting boost pressures of <10psi possibly <20psi you'll need one to prevent damage.
Re: Basic Questions - New
bov's are an odd thing. they're not necessarily needed. but all they do is bypass the pressurized air back into the intake (or to atmosphere if your a mad kent) and half of the reason they are plumbed back is for emission laws.
i wont comment on compressor surge, but there is no way in hell 0-30psi will stall or reverse spin a shaft spinning at over 300,000ish rpm.
bov's are an odd thing. they're not necessarily needed. but all they do is bypass the pressurized air back into the intake (or to atmosphere if your a mad kent) and half of the reason they are plumbed back is for emission laws.
i wont comment on compressor surge, but there is no way in hell 0-30psi will stall or reverse spin a shaft spinning at over 300,000ish rpm.
jc258
New Member
Re: Basic Questions - New
Has nothing to do with stalling or reversing the turbo, its because it places more force/pressure on the turbine and can fatigue the blades and put more stress on the shaft. You'll blow a hose quicker or fry a belt, or even snap the shaft in half or take out a TB blade in some cases. Think about how much air would build up before the TB if it was closed and had nowhere to go. With the size of the engines/turbos on these cars, it may not be a big deal, but bigger cars it is.
unclepaulie said:
Has nothing to do with stalling or reversing the turbo, its because it places more force/pressure on the turbine and can fatigue the blades and put more stress on the shaft. You'll blow a hose quicker or fry a belt, or even snap the shaft in half or take out a TB blade in some cases. Think about how much air would build up before the TB if it was closed and had nowhere to go. With the size of the engines/turbos on these cars, it may not be a big deal, but bigger cars it is.
Royzie
New Member
OMG THE AMOUNT OF FALSE INFORMATION IN THIS THREAD IS GIVING ME A HEADACHE!!
Blow off valves have no use but to make noise?
There is no theoretical proof of damage done to turbos from not running a blow off valve?
They arent needed, as i proved on the civic
They are recommended by me which is why im running one on the nissan
My old turbo is shagged, may not of been from no blow off valve but i'm not going to risk it for the sake of 200 bucks
running no blow off valve causes more lag too because it fks the momentum of the turbine farking its lifetime (yes i sound like a poster boy but it makes perfect sense and i believe it)
Blow off valves have no use but to make noise?
There is no theoretical proof of damage done to turbos from not running a blow off valve?
They arent needed, as i proved on the civic
They are recommended by me which is why im running one on the nissan
My old turbo is shagged, may not of been from no blow off valve but i'm not going to risk it for the sake of 200 bucks
running no blow off valve causes more lag too because it fks the momentum of the turbine farking its lifetime (yes i sound like a poster boy but it makes perfect sense and i believe it)
Re: Basic Questions - New
im quite aware hence the comma, separating two trains of thought delivered in one sentence.
also, im with roy on the lag. i ran bovless for a while and my car became quite a bit laggier. i personally will run a recirc'ed bov all the time...unless im bored and want some pssssht
jc258 said:
im quite aware hence the comma, separating two trains of thought delivered in one sentence.
also, im with roy on the lag. i ran bovless for a while and my car became quite a bit laggier. i personally will run a recirc'ed bov all the time...unless im bored and want some pssssht
d3x
Member
Lifes to short to run BOV's haha. Dosing is the sexiest sound...the worst being the hks ssqv which ive owned. I guess the best bet wud get an adjustable plumback that you can tighten up. With regards to damage - 9 psi is not much so id say with our systems they are not necessary, but can reduce risk of damage and reduce lag.
:O no way. ssqv's are the bomb!
and yeah roy, its quiet, sometimes i can hear the woosh though. i think itll get louder when i convert to all hard pipe, rather then plastic/rubber
and yeah roy, its quiet, sometimes i can hear the woosh though. i think itll get louder when i convert to all hard pipe, rather then plastic/rubber
SSQ sounds like a high pitched fart lol
The blow-off valve is more commonly used to keep the turbocharger spinning when the throttle plate is suddenly closed. When the turbocharger is generating maximum boost pressure at full throttle and then the throttle is suddenly closed, compressed air coming from the compressor slams against the throttle, generating extremely high pressures that travel backwards to the compressor stopping the compressor from spinning. When the throttle plate is again opened, the engine must spool the turbocharger shaft again. The effects of this high pressure can also be very damaging to the turbocharger
I was running no BOV for over a year, i can show you what damage was done to the NEW turbo and the amount of shaft play that it had
The blow-off valve is more commonly used to keep the turbocharger spinning when the throttle plate is suddenly closed. When the turbocharger is generating maximum boost pressure at full throttle and then the throttle is suddenly closed, compressed air coming from the compressor slams against the throttle, generating extremely high pressures that travel backwards to the compressor stopping the compressor from spinning. When the throttle plate is again opened, the engine must spool the turbocharger shaft again. The effects of this high pressure can also be very damaging to the turbocharger
I was running no BOV for over a year, i can show you what damage was done to the NEW turbo and the amount of shaft play that it had
Jazza2442 said:
not really, the reason recirc is better then VTA only applies to MAF sensor based ecu's as the ecu knows how much air is meant to be recirculated and adjust fuel to suit, so when the air doesnt get recirculated, the ecu still think the air is there so the AFR runs rich, when causes bad fuel economy and stalling.
if you have a MAP based ecu, you can VTA all day
unclepaulie said:
This is for my personal benefit, but I'm sure some others would like to know... I'm turboing my car, I've currently got a MAF, if I upgrade to a stand alone ECU do I still need the MAF? And I'll be able to successfully run a VTA BOV? (I like the wank factor)
im no expert, but theres a lot of non-turbo owners saying a lot in here.
with no offence meant to those who may know a bit about it, id be listening to those with turbo experience.
if youre still not confident in that, then ask on evo forums like 4gtuner, evolutionoz, evocoupe etc.
with no offence meant to those who may know a bit about it, id be listening to those with turbo experience.
if youre still not confident in that, then ask on evo forums like 4gtuner, evolutionoz, evocoupe etc.