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Do I NEED a blow off?

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Old Jun 4, 2008 | 09:48 PM
  #26  
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Boost with no BOV is like casual sex w/o a condom. This issue has been covered 100 times over and you should probably search. In fact you should quit wasting our time. If you have 1000 posts, let alone a single turbo, you should know the answer.
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Old Jun 4, 2008 | 09:50 PM
  #27  
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Originally Posted by rossc
I realize that it already has been covered that garrett has a ball bearing system capable of standing up to compressor surge.
And diamonds are unbreakable....BULLSHIT
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Old Jun 4, 2008 | 10:19 PM
  #28  
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Originally Posted by rossc
Where do you draw the line at "Need"?

Do you "Need" to run an air filter on your intake? Well no, you don't. But then why do 99.9% of cars in existance come with some sort of intake filter? Because it promotes engine longevity.

Do you "Need" to run at least 91 octane in an rx7? Nope, you can run 87 just fine. But again, nobody does. Do you "Need" a boost control mechanism? Well no, you could leave the wastegate closed and just pedel the throttle.

Do I "Need" to get out of bed and haul my *** to work Monday-Friday? No way man, I could sleep the day away. But its impractical.

So do you need some type of pressure relief on a turbo system? Yes, you need one. Why? Well simply because it would be pretty retarded not to.
This poor guy ^^^

-J
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Old Jun 5, 2008 | 01:48 PM
  #29  
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anyone? .. pllsss
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Old Jun 5, 2008 | 02:10 PM
  #30  
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its the brown things that come off your stock turbo's and have hoses that go to your air box. They have a vacuum line that goes to each of them. thats assuming your car is stock.
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Old Jun 5, 2008 | 02:13 PM
  #31  
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a simple seach took me like 10 secs. https://www.rx7club.com/showthread.p...ight=stock+BOV
There is a pic in this link
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Old Jun 5, 2008 | 05:08 PM
  #32  
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thx!
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Old Jun 6, 2008 | 02:51 AM
  #33  
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So after reading all this....what if you simply want to disconnet the factory bov to get some compressor surge sound

Just disconnet the factory pipe and plug up the hole in the factory airbox and the hole at the end of the factory bov hose?
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Old Jun 6, 2008 | 10:54 AM
  #34  
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Originally Posted by rossc
100k+? That seems unlikely. Who even remembers that far back? My friend recently told me she ran into Kanye West at the mall and he asked her to go back to his hotel with him. I told her this was unlikely.

Answer me this. If re-circ valves are so useless, then why are they still being put on brand new forced induction vehicles? If motor companies can save $1 on the production of a vehicle, then they would do so in a heart-beat. The material costs for these valves arn't free, and the engineering certainly isn't free either.

Bottom line, if I can get even an extra 10k out of my $4k turbo system because I spent $50 putting in a stupid re-circ valve, then you can sure bet I'll spend the $50.

And if the man wants his rx7 to be quiet, then going without a re-circ is NOT the way to go. Have you ever heard compressor surge at 1bar? That sound would annoy the crap out of me way more than the sound of a BOV would. The re-circ valve is the quietest solution by far.

So yes, you do need a BOV/re-circ. Unless as suggested you plan on racing for the cup. Then you might have some type of BOV related catastrophic failure costing you the fame, fortune, and women.
Lots of opinions... Again you do not need to run a BOV it is purely a choice. If you don't run a BOV your car will still start, still boost, and still drive down the road, PERIOD. Most factory turbos were not designed to withstand long term compressor surge, which means if auto manufacturers want to guarantee the turbo will outlive the warranty a cheap recirc valve is a small price to pay. Not running a BOV would certainly not result in an entire "$4K turbo setup" failing. At worst you would have premature seal/bearing failure and require a rebuild or another turbo, whichever is cheaper. Also considering BOV/recirc's tend to fail as well it might end up being cheaper in the long run if you have a turbo that can easily withstand compressor surge. There is a big difference between a necessity ("need"), and your opinion, whether you realize it or not .

Who needs to remember that far back? isn't that what odometers are for? . These people had absolutely no reason to lie about the mileage on their turbo setups, so i see no reason not to believe them. The fact that garrett supports their claims that the BB series turbos were designed for that abuse is all the more reason to believe them, unless you're claiming to know more about turbo design than garrett?

Lastly if you go back and actually read my post I was really just correcting your responses inaccuracies. But if you notice at the end I did mention that if he wanted a quiter setup he should look into a recirc valve (oh gosh!).
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Old Jun 6, 2008 | 01:48 PM
  #35  
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Originally Posted by JHew84
Lots of opinions... Again you do not need to run a BOV it is purely a choice. If you don't run a BOV your car will still start, still boost, and still drive down the road, PERIOD. Most factory turbos were not designed to withstand long term compressor surge, which means if auto manufacturers want to guarantee the turbo will outlive the warranty a cheap recirc valve is a small price to pay. Not running a BOV would certainly not result in an entire "$4K turbo setup" failing. At worst you would have premature seal/bearing failure and require a rebuild or another turbo, whichever is cheaper. Also considering BOV/recirc's tend to fail as well it might end up being cheaper in the long run if you have a turbo that can easily withstand compressor surge. There is a big difference between a necessity ("need"), and your opinion, whether you realize it or not .

Who needs to remember that far back? isn't that what odometers are for? . These people had absolutely no reason to lie about the mileage on their turbo setups, so i see no reason not to believe them. The fact that garrett supports their claims that the BB series turbos were designed for that abuse is all the more reason to believe them, unless you're claiming to know more about turbo design than garrett?

Lastly if you go back and actually read my post I was really just correcting your responses inaccuracies. But if you notice at the end I did mention that if he wanted a quiter setup he should look into a recirc valve (oh gosh!).
I could also remove my intercooler. If you don't run an intercooler your car will still start, still boost, and still drive down the road, PERIOD. Wow...

At worst you would have premature seal/bearing failure and require a rebuild or another turbo, whichever is cheaper.
Or you could avoid the chance of premature seal/bearing failure by not being a doink and just putting a circ valve on.

Please show me where I've corrected my inaccuracies. The only reason I've re-stated my points is because they obviously were not stated in simple enough terms the first time.

The guy asked for a straight up, no bullshit answer (if you read the post). Everybody responded with the stupid and blunt obvious answer of "no, but you know it's probably a good idea." I simply skipped the bullshit and stupidity and answered "yes, because its a good idea".
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Old Jun 6, 2008 | 01:56 PM
  #36  
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Originally Posted by rossc
I could also remove my intercooler. If you don't run an intercooler your car will still start, still boost, and still drive down the road, PERIOD.
You know, there is someone on this forum running turbocharged without an intercooler. He is running AI though.
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Old Jun 7, 2008 | 03:33 AM
  #37  
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Originally Posted by Barban
This issue has been covered 100 times over and you should probably search. In fact you should quit wasting our time. If you have 1000 posts, let alone a single turbo, you should know the answer.
Searched? Yup. Mixed results, Yup.

I want to hear peoples opinions... Sorry new to the ST scene
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Old Jun 7, 2008 | 11:22 AM
  #38  
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Originally Posted by rossc
I could also remove my intercooler. If you don't run an intercooler your car will still start, still boost, and still drive down the road, PERIOD. Wow...
If you took the proper precautions to run without an intercooler what's the issue? Find a better example next time.

Originally Posted by rossc
Or you could avoid the chance of premature seal/bearing failure by not being a doink and just putting a circ valve on.

Please show me where I've corrected my inaccuracies. The only reason I've re-stated my points is because they obviously were not stated in simple enough terms the first time.

The guy asked for a straight up, no bullshit answer (if you read the post). Everybody responded with the stupid and blunt obvious answer of "no, but you know it's probably a good idea." I simply skipped the bullshit and stupidity and answered "yes, because its a good idea".
I never said you corrected anything, stop skimming and go actually read what I said . You gave a generalized answer and passed it off as fact. No a BOV is NOT required on a turbo setup, and in some cases (BB center sections) it's not even unreliable! At this point it's blatently obvious you were unaware of that fact and seem to be having massive issues admiting you were wrong!

Who's everybody? Mahjik? . His response was the only one countering what you had said and was entirely accurate. Again you need to choose your words a little more wisely, it's what made your statement innaccurate in the first place!

Maybe you should go back and read what the OP wanted to hear. Not only did you go against his request to avoid any wise *** comments, you provided absolutely no credible information on the subject past your obviously uneducated opinion and generalized comments. Bottom line you do not NEED to run a BOV, many people have proven this over the years and a prominent turbo company supports it, get your head out of your *** and accept that you could possibly be wrong...
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Old Jun 7, 2008 | 12:17 PM
  #39  
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girls... girls

maybe this will help:

http://en.wikipedia.org/wiki/Blow-off_valve

http://www.carblog.co.za/2006/09/07/...-installation/
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Old Jun 7, 2008 | 03:37 PM
  #40  
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Originally Posted by sickboy2345
A source who's credibility is so far gone they are basically a joke (read the page, if you don't see it I can see why you'd use it as a source in the first place...), and a writeup on how to install a BOV into a nissan in place of the factory bypass valve... Niether of which address the difference between load capabilities of a ball bearing or thrust bearing center section...

I encourage either of you to send garrett an email and become enlightened. Hell go read ANY of their FAQ's, when they discuss compressor surge they ONLY mention the damage it will do to turbos with thrust bearing center sections. Please, go question one of the leading turbo designers in the world and see how far you get with them...

Last edited by JHew84; Jun 7, 2008 at 03:42 PM.
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Old Jun 8, 2008 | 03:06 AM
  #41  
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do not try to get me involved mate, just wanted you 2 to stop arguing..
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Old Jun 8, 2008 | 06:38 AM
  #42  
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Ran my Integra GSR turbo without a BOV for a long time. Same with my TO4-R FD3S.

Do 18wheelers even run them?

This could very quickly turn into the "turbo timer" thread. Pure comedy.
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Old Jun 8, 2008 | 11:20 AM
  #43  
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Diesels are different, they don't use a throttle body so the positive pressure is bled off through the exhaust. It is the same with post TB turbo setups as well (the delereon had a couple available for it I just found out the other day).

My truck does not have a BOV, the turbo just winds down with the RPM's, sounds really cool .

Originally Posted by sickboy2345
do not try to get me involved mate, just wanted you 2 to stop arguing..
It's cool, I'm not so much arguing but I think it would be a shame if someone looking for a real answer came across this thread in the future and all he had to go from was misinformation. If you find a definitive answer from a credible source be sure to post it! although if testimonies from many people who seem to have done it already and the fact that garrett supports it isn't enough I'm not sure what will be.
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Old Jun 8, 2008 | 07:32 PM
  #44  
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Can I ask a genuine question, all arguements aside and all side effects aside

If I was bored of the stock coughing sound the factory bov makes, and I wanted a little compressor surge sound, do I simply block off the factory BOV and block up the hole in the airbox? and I will get some noise?

Thank you !
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Old Jun 8, 2008 | 09:04 PM
  #45  
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From: MI
Yes, there are a few vacuum lines you'll need to cap off as well.
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Old Jun 9, 2008 | 06:45 AM
  #46  
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Originally Posted by JHew84
Yes, there are a few vacuum lines you'll need to cap off as well.
Any chance anyone has a link to photo's of what needs to be blocked off? or have their own photos?

It would be much appreciated. Thanks
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Old Jun 9, 2008 | 08:22 AM
  #47  
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https://www.rx7club.com/showthread.php?p=8113663

There's a link to one of the posts in the FAQ, it has vacuum diagrams from completely stock, to very simplified single setup. You'll probably just want to take a look at the first one and trace the vacuum lines from the DV's.
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