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  1. #1
    Veteran Member Four Rings El_Chapusca's Avatar
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    Question Blow Off Valve VS Diverter Valve

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    Do they do the same thing, or are they two complete different types off valves that will serve different purposes
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  2. #2
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Both do the same job: release boost pressure. The blow off valve vents the boost from the turbo to the atmosphere, while the DV take it back to the airbox, creating a kind of closed loop system. Some like the "woosh" of the blow off valve, but our cars are design to work with a DV.
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  3. #3
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    So a blow off valve would work i was thinking HKS SS
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  4. #4
    Veteran Member Four Rings 04QuattroTurbo's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by AudiA4Turbo22 View Post
    Both do the same job: release boost pressure. The blow off valve vents the boost from the turbo to the atmosphere, while the DV take it back to the airbox, creating a kind of closed loop system. Some like the "woosh" of the blow off valve, but our cars are design to work with a DV.
    Yeah, but you would get a MIL or CEL with a Blow-off valve right? Since the closed loop will cause a leak? I think unless you are looking to hear that blow-off sound, it is recommended by many here to get a better Diverter Valve than the plastic OEM one rather than using a Blow-off Valve.
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  5. #5
    Registered Member Four Rings A4ringedONE8T's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    HKS SSQ or a Forge 004 are the typical BOV's that will work on MOST MAF'd cars. While there are plenty of 1.8T guys running them without problems, there are certain cars which do not like them, just luck of the draw

  6. #6
    Registered Member Four Rings A4ringedONE8T's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by 04QuattroTurbo View Post
    Yeah, but you would get a MIL or CEL with a Blow-off valve right? Since the closed loop will cause a leak? I think unless you are looking to hear that blow-off sound, it is recommended by many here to get a better Diverter Valve than the plastic OEM one rather than using a Blow-off Valve.
    No, as long as its a BOV that is closed at idle, it should be fine and wont cause any CEL's

  7. #7
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Will the Diverter Valve still give me that "Swooosh" followed by the air release Sound that the hks's and other brand B/V's do ? i just love that sound
    -Joey aka Chappy

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  8. #8
    Veteran Member Four Rings aaaudiprotein's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    I run Forge 004 with no problems (knocking on wood), i sold HKS SQV to one of the members and i think he runs it with no problems too.
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  9. #9
    Veteran Member Four Rings aaaudiprotein's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by El_Chapusca View Post
    Will the Diverter Valve still give me that "Swooosh" followed by the air release Sound that the hks's and other brand B/V's do ? i just love that sound
    Not that loud... some people say Forge 007 in reverse would make that noise, i tried that but nothing happened.
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  10. #10
    Veteran Member Four Rings dirtybrd's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by El_Chapusca View Post
    Will the Diverter Valve still give me that "Swooosh" followed by the air release Sound that the hks's and other brand B/V's do ? i just love that sound
    With an aftermarket intake, or just a filter on the MAF. But not as loud.
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  11. #11
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    thanks for all the info the guys selling me one for $90 HKS SS
    -Joey aka Chappy

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  12. #12
    Registered Member Four Rings A4ringedONE8T's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by El_Chapusca View Post
    thanks for all the info the guys selling me one for $90 HKS SS
    Its either a POS (broken) or a knock off, they are worth quite a bit more than that, even used

  13. #13
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    yea imma check it out first to see if its legit and if just the BOV itself or if it will also come with the components good thing he local and also
    -Joey aka Chappy

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  14. #14
    Veteran Member Four Rings aaaudiprotein's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Is HKS SQV is the same as SS?
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  15. #15
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    MA bah i meant SQV and btw does anyone know the difficulty level on the installation of this thing? scale from 1-10
    -Joey aka Chappy

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  16. #16
    Veteran Member Four Rings aaaudiprotein's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Oh shnap, i sold one for $50 with 10k miles on it.
    Install is easy, it seems difficult if you know nothing about the cars, but it is very easy.
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  17. #17
    Senior Member Three Rings ProJect_*A4*'s Avatar
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    Re: Blow Off Valve VS Diverter Valve

    dont forget, you need the recirculation kit, and adapter flange...

    http://www.audizine.com/forum/showthread.php?t=227952

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  18. #18

    Re: Blow Off Valve VS Diverter Valve

    ^ was gonna say that..

    Also, Do you have any other mods to the engine? With going BOV over Div I would like to see other mods to the engine, or at least chipped.

    Majority of the time like Shawn said, you'll be fine.. BUT there are those special cases where if you are closer to stock it will just put u in a world of shit. Might want to go Forged 007 and just reverse it until you get more engine mods, if you don't have that many. Keep in mind your expelling air to atmosphere with BOV, which means your boost pressure can drop between shifts, make sure your compensating for this, hence at least a chip.

  19. #19
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    dude 1 piece of advice, i know u wanna hear that epic whistle from our turbo, and i there's nothing wrong with that but save ur $90 and buy a 710N from a TT225 from the dealer for $40, u don't have a BAT or a BT to have the need for a crazy DV or BOV, our cars really don't agree with BOV's, that little bit of air that is recirculated by ur DV really does preserve the turbo, i have APR 1+ and i spike around 21PSI and i've had a 710N DV and it has never failed, and trust me with a cone filter and a sweet heatshield u'll hear a PSHHHHHH instead, nearly as loud as a BOV but much how should i say Classier? form. just my useless $0.02 but just wanna help.

    Yo Shawn i got some good news my CEL came back lol!
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  20. #20

    Re: Blow Off Valve VS Diverter Valve

    ^ +1

  21. #21
    Senior Member Three Rings demea's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    There ya go...
    It does both and has adapters to make it either a full BOV or full DV.
    I have one waiting to be put on.

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  22. #22
    Veteran Member Four Rings El_Chapusca's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    I belive theres different size springs that will go in the diverter valve depending on how much HP the car is pulling but correct me if im wrong.
    -Joey aka Chappy

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  23. #23
    Registered Member Four Rings A4ringedONE8T's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by A4Tuuuurbo View Post
    ^ was gonna say that..

    Also, Do you have any other mods to the engine? With going BOV over Div I would like to see other mods to the engine, or at least chipped.

    Majority of the time like Shawn said, you'll be fine.. BUT there are those special cases where if you are closer to stock it will just put u in a world of shit. Might want to go Forged 007 and just reverse it until you get more engine mods, if you don't have that many. Keep in mind your expelling air to atmosphere with BOV, which means your boost pressure can drop between shifts, make sure your compensating for this, hence at least a chip.

    Absolutely, unless you have a reason to be drawing attention to your car (IE a decent amount of power), I would stay clear of the BOV sounds. You'll feel worse when you get whipped by some POS thinking your car is fast because it has a BOV

  24. #24
    Senior Member Three Rings demea's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by A4ringedONE8T View Post
    Absolutely, unless you have a reason to be drawing attention to your car (IE a decent amount of power), I would stay clear of the BOV sounds. You'll feel worse when you get whipped by some POS thinking your car is fast because it has a BOV
    And that would be pretty much most cars out there
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  25. #25
    Veteran Member Four Rings 04QuattroTurbo's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by AudiA4Turbo22 View Post
    dude 1 piece of advice, i know u wanna hear that epic whistle from our turbo, and i there's nothing wrong with that but save ur $90 and buy a 710N from a TT225 from the dealer for $40, u don't have a BAT or a BT to have the need for a crazy DV or BOV, our cars really don't agree with BOV's, that little bit of air that is recirculated by ur DV really does preserve the turbo, i have APR 1+ and i spike around 21PSI and i've had a 710N DV and it has never failed, and trust me with a cone filter and a sweet heatshield u'll hear a PSHHHHHH instead, nearly as loud as a BOV but much how should i say Classier? form. just my useless $0.02 but just wanna help.

    Yo Shawn i got some good news my CEL came back lol!
    Wow, Kirk, no exclamation points, I'm proud of you. BTW, no package yet.

    Is there a DIY on how to install the 710N?
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  26. #26
    Veteran Member Four Rings BEESIX's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    i bought that hks ssqv from audiprotien and im running it fineeeeee, but its too loud for my taste, so i wanna get a greddy type s and recirculate that back into my system kind of like a DV ill post up how that works once i get it
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  27. #27
    Veteran Member Four Rings BEESIX's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    oh nd tht hks ssqv was from a wrx, if ur good with your hands wil a little custom fab u can make it work its not hard at all
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  28. #28
    Senior Member Three Rings 102487thedude's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Just so u guys know they both are the exact same thing the only diffrence is if you choose to run a line from the valve back to the inlet before the turbo. the valve itsself is the same.
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  29. #29
    Veteran Member Four Rings A4 KiDD 810's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by AudiA4Turbo22 View Post
    Both do the same job: release boost pressure. The blow off valve vents the boost from the turbo to the atmosphere, while the DV take it back to the airbox, creating a kind of closed loop system. Some like the "woosh" of the blow off valve, but our cars are design to work with a DV.
    Nailed it, but in addition, for those who like the whoosh sound, you can still avoid a BOV, just get a cone intake and you will get the sound from your DV.
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  30. #30
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by 04QuattroTurbo View Post
    Wow, Kirk, no exclamation points, I'm proud of you. BTW, no package yet.

    Is there a DIY on how to install the 710N?
    Correction Package received yesterday. working on the exclamations and lolz. uhm well installing a 710N is the same as installing any other DV/BOV, straight forward, if u remove the belly pan while on jack stands and look up the passenger side, u'll see ur stock DV, hard top reach as there is little space to work with, but install it in the exact opposite direction that ur stock one is pointing, good luck with the clamps.
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  31. #31
    Veteran Member Four Rings 04QuattroTurbo's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by AudiA4Turbo22 View Post
    Correction Package received yesterday. working on the exclamations and lolz. uhm well installing a 710N is the same as installing any other DV/BOV, straight forward, if u remove the belly pan while on jack stands and look up the passenger side, u'll see ur stock DV, hard top reach as there is little space to work with, but install it in the exact opposite direction that ur stock one is pointing, good luck with the clamps.
    You're right, I got the package a few hours after posting that. Anyway, great job on the exclamations! I read somewhere that some A4's already have the 710N installed. Does anyone have pictures on how the "stock" one differs from the 710N so I can "eyeball" it and see if I already have the 710N?

    Clamps? I have a snap ring pliers set, would that make things easy?
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  32. #32
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    710N:



    stock 710A:

    -Kirk
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  33. #33
    Veteran Member Four Rings 04QuattroTurbo's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    That's what I was afraid of they look identical! Where does this thing sit exactly in relation to the engine...I hate getting underneath my car! LOL
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  34. #34
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    ^^it sits in front of the radiator near the air box, or right below the timing belt cover, u can tell the difference, the stock one is much smaller.
    -Kirk
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  35. #35
    Registered Member One Ring
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    Re: Blow Off Valve VS Diverter Valve

    Okay, this is a very touchy topic for ANY turbo car owner....BUT to re-ask on this topic.!
    I own a Stock 2000 A4 B5, and admire the 'Psss' sound...so I did ALOT of research and it was said by many to go with the Bosch TT 710N and to NOT deal with a True "Blow Off Valve"..My question is can I turn this "Diverter Valve" into a "blow off valve" by simply plugging the turbo hose inlet and having it run to atmosphere without consequence..In other words a common CEL or Rubbish Idle? ANY insight is appreciated as I have the part on order..Thank you!

  36. #36
    Veteran Member Four Rings aaaudiprotein's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by AyFourBeeFive View Post
    Okay, this is a very touchy topic for ANY turbo car owner....BUT to re-ask on this topic.!
    I own a Stock 2000 A4 B5, and admire the 'Psss' sound...so I did ALOT of research and it was said by many to go with the Bosch TT 710N and to NOT deal with a True "Blow Off Valve"..My question is can I turn this "Diverter Valve" into a "blow off valve" by simply plugging the turbo hose inlet and having it run to atmosphere without consequence..In other words a common CEL or Rubbish Idle? ANY insight is appreciated as I have the part on order..Thank you!
    DV and BV have the same "design" but do "different" functions.
    i used my forge 004 for 6 months with NO problems, yeah car felt a BIT slower though. but my mechanic freaked out when he found out i was using it :)
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  37. #37
    Veteran Member Four Rings JMRQuattro's Avatar
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    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by El_Chapusca View Post
    Will the Diverter Valve still give me that "Swooosh" followed by the air release Sound that the hks's and other brand B/V's do ? i just love that sound

    instead of being loud like what you hear, it will be a lot quieter. I've had friends in reference to the diverter valve say it sounds like my car is breathing. You can hear it but it's not really loud. But if you got a FMIC it would be louder like a BOV while still maintaining the enhanced performance of the DV.

    Here you go, GOOGLE:
    Technically part of the intake system. A diverter valve redirects turbo backpressure to the intake side of the turbo. This accomplishes two things, 1) does not damage turbo, 2) re-uses boost. A Diverter Valve is not to be confused with a Blow Off Valve or BOV which releases excess boost into the atmosphere while making the famous ‘Fast and the Furious’ “PSSSH” sound. Many say this sound can be somewhat replicated with an aftermarket or custom intake and a good diverter valve.
    - Justin -

  38. #38
    Registered Member One Ring
    Join Date
    Jan 07 2009
    AZ Member #
    37174
    Location
    Kansas

    Re: Blow Off Valve VS Diverter Valve

    Okay, I own a 2000 Audi A4 B5 and SIMPLY just want an easy setup. all I'm looking to do is to setup filter to MAF sensor to stock pipe as shown in the picture(with the red car).....I went to unplug my air box and the Air Pump line(on the top of the box) seems permanetley attached ...Can I simply run a small air filter on the air pump,, or how do I go about this>?? ANY info is very much appreciated...Thankyou
    (I have a 710n diverter valve I plan on running to atmosphere just to make this thread related)

  39. #39
    Senior Member Three Rings teg2audi's Avatar
    Join Date
    Apr 23 2008
    AZ Member #
    28034
    My Garage
    2004 Audi A4 1.8t
    Location
    Portland, OR

    Re: Blow Off Valve VS Diverter Valve

    Forge Splitter Valve, then you get the recirculation and blow off depending on the setting. I run a Forge 007, didn't want the blow off sound that loud.
    Black 04 Audi A4 1.8t
    APR Stage 2+, tt injectors, forge 007, South Bend OFE Stage 3 Clutch, APR Snub, Podi, Test Pipe

    Member # 15 of Coalition of The OEM+ Audi Owners.

  40. #40
    Veteran Member Four Rings diagnosticator's Avatar
    Join Date
    Aug 26 2005
    AZ Member #
    7741
    Location
    Seattle, WA

    Re: Blow Off Valve VS Diverter Valve

    Quote Originally Posted by El_Chapusca View Post
    I belive theres different size springs that will go in the diverter valve depending on how much HP the car is pulling but correct me if im wrong.

    The HP level has no bearing on the spring rate used, it's only a matter of boost pressure levels, and the installed orientation of the valve, as effects the several pressure related forces on the valve during operation.

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