Results 1 to 16 of 16
  1. #1
    dell's Avatar
    Join Date
    Aug 2007
    Location
    pennsylvania
    Posts
    10

    Default Turbo blow off valve install

    I wanted to install a blow off valve on my turbo kit. I am not quite sure where it needs to go. Does the intake plenum need modified to accept it or can I use one of these 2" tubes from ebay with a flange already welded on it and just splice into the charged tube line between the turbo and intake. Thanks for any help.
    jason bogden

  2. #2
    Call me Liberace!
    ogre's Avatar
    Join Date
    May 2009
    Location
    The Northwest
    Posts
    5,281

    Default Re: Turbo blow off valve install

    the closer you can locate the bov to the throttle bodies (plenum), the more effective the bov will be. the charge piping is so short, frankly, that it probably won't matter in your application.
    Thankful for his Friends...

    2006 Raiment White Hayabusa
    Lumen Junkie in Residence
    Why retros are safer than HID kits

  3. #3
    dell's Avatar
    Join Date
    Aug 2007
    Location
    pennsylvania
    Posts
    10

    Default Re: Turbo blow off valve install

    Thanks so much, it will save me a lot of money if I just buy one of these small pipes with flange already welded to it and bolt bov to it. I will put it just before intake if you don't think it will make a difference.
    jason bogden

  4. #4
    Rookie PaulCav's Avatar
    Join Date
    Dec 2009
    Location
    Loganville, GA
    Posts
    274

    Default Re: Turbo blow off valve install

    If you are not running anymore then 10lbs boost you do not need one.
    It is too bad bench racing is not measureable. That way someone would win.

  5. #5
    Top Gun


    Join Date
    Dec 2010
    Location
    Houston, TX
    Posts
    1,134

    Default Re: Turbo blow off valve install

    Quote Originally Posted by PaulCav View Post
    If you are not running anymore then 10lbs boost you do not need one.
    NEGITIVE!! Any sort of positive pressure not used, will exit out the way I came....back through the turbo. It may take longer to damage the turbo at low boost, but regardless it still causes damage. Specially on a street bike, when your constantly on and off the throttle.

  6. #6
    dell's Avatar
    Join Date
    Aug 2007
    Location
    pennsylvania
    Posts
    10

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Murderedout07 View Post
    NEGITIVE!! Any sort of positive pressure not used, will exit out the way I came....back through the turbo. It may take longer to damage the turbo at low boost, but regardless it still causes damage. Specially on a street bike, when your constantly on and off the throttle.
    I am planning to install a bov as well as a boost control this week. I am going to try to run the bov spliced into the silicon charge hose with a prefabbed flange. I am trying to avoid fabricating the bov into the intake plenum. Hopefully this setup will work. Thanks for your response.
    jason bogden

  7. #7
    Top Gun


    Join Date
    Dec 2010
    Location
    Houston, TX
    Posts
    1,134

    Default Re: Turbo blow off valve install

    Don't cheap out, and half ass it like that. Take the plenum off and have someone weld the flange to it.

    And if your bikes a stage 1 with a fmu, DO NOT install a boost controler. Fmu's can not compensate for multiple boost levels.

  8. #8
    dell's Avatar
    Join Date
    Aug 2007
    Location
    pennsylvania
    Posts
    10

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Murderedout07 View Post
    Don't cheap out, and half ass it like that. Take the plenum off and have someone weld the flange to it.

    And if your bikes a stage 1 with a fmu, DO NOT install a boost controler. Fmu's can not compensate for multiple boost levels.
    Will this setup not work? My other thought was that I could have the bov more exposed and thus get a better sound from it rather than have it stuck under my fuel tank. I have to admit this would be my first install and I didn't know if it would work or not and this way I wouldn't be committed to it. I have been told by a couple of people I didn't need it but I have to admit I think they sound cool and I wanted to try it out.
    jason bogden

  9. #9
    Top Gun


    Join Date
    Dec 2010
    Location
    Houston, TX
    Posts
    1,134

    Default Re: Turbo blow off valve install

    I'm not saying that it won't work, but it is the wrong way to go about it. If you have a turbo bike you obviosly have some money in to it. So why cut corners now? The proper way is to have it welded on to the plenum. And it's not gonna be any louder if it's under the tank, or sticking out like a frame slider. It depends what valve you get. If your all about aBout sound, the go with a turbo xs, or a hks blow off valve.

  10. #10
    dell's Avatar
    Join Date
    Aug 2007
    Location
    pennsylvania
    Posts
    10

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Murderedout07 View Post
    I'm not saying that it won't work, but it is the wrong way to go about it. If you have a turbo bike you obviosly have some money in to it. So why cut corners now? The proper way is to have it welded on to the plenum. And it's not gonna be any louder if it's under the tank, or sticking out like a frame slider. It depends what valve you get. If your all about aBout sound, the go with a turbo xs, or a hks blow off valve.
    Yes it is true I have some money into it. I don't really want to cheap it out. I mostly wanted the sound, but if it doesn't make a difference I'll have someone weld the flange to the plenum and just go with an hks bov. Thanks for the input. I guess it wouldn't be a good idea to run a boost controller even if I only bump it up to 10psi? If thats the case I will just leave it alone.
    jason bogden

  11. #11
    Top Gun


    Join Date
    Dec 2010
    Location
    Houston, TX
    Posts
    1,134

    Default Re: Turbo blow off valve install

    Your better off leaving it alone, unless you wanna take it to a dyno again. even with that being said, if your motor is stock compression I definitely wouldn't do it.

  12. #12
    Rookie PaulCav's Avatar
    Join Date
    Dec 2009
    Location
    Loganville, GA
    Posts
    274

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Murderedout07 View Post
    NEGITIVE!! Any sort of positive pressure not used, will exit out the way I came....back through the turbo. It may take longer to damage the turbo at low boost, but regardless it still causes damage. Specially on a street bike, when your constantly on and off the throttle.
    I respectfully disagree with you on this, the boost is not enough to cause damage to the turbo in the Hayabusa application if it is below 10 lbs. I have been drag racing a Velocity Stage 1 turbo since 2007. Looking over my run records, as of last year I have 1,124 WFO passes on the turbo at 6 lbs and 183 passes at 10 lbs with no repairs to the turbo. Where a definite problem comes into play is when you start going to the higher boost levels without a BOV you run the risk of damaging the throttle bodies when chopping the throttle after wide open pass under full boost. I have seen the excess boost bend the butterflies on Pro Street bikes.
    It is too bad bench racing is not measureable. That way someone would win.

  13. #13
    Frank
    POWERHOUSE's Avatar
    Join Date
    Nov 2007
    Location
    east coast
    Posts
    1,809

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Murderedout07 View Post
    Don't cheap out, and half ass it like that. Take the plenum off and have someone weld the flange to it.

    And if your bikes a stage 1 with a fmu, DO NOT install a boost controler. Fmu's can not compensate for multiple boost levels.
    Murdered07: Although I think you are correct in cautioning someone new, I am sure that you know that you can run an FMU with a boost controller, we do it all the time. The FMU only ramps the fuel pressure, it has nothing to do with compensating the A/F for different levels, as you said. Usually on a Stage One, running a powercommander set up for boost-referencing will do the trick just fine . . . giving a Stage One more range.

    Quote Originally Posted by PaulCav View Post
    I respectfully disagree with you on this, the boost is not enough to cause damage to the turbo in the Hayabusa application if it is below 10 lbs. I have been drag racing a Velocity Stage 1 turbo since 2007. Looking over my run records, as of last year I have 1,124 WFO passes on the turbo at 6 lbs and 183 passes at 10 lbs with no repairs to the turbo. Where a definite problem comes into play is when you start going to the higher boost levels without a BOV you run the risk of damaging the throttle bodies when chopping the throttle after wide open pass under full boost. I have seen the excess boost bend the butterflies on Pro Street bikes.
    Check out which way the throttle plates were bent the next time you see this. Sometimes they bend out, instead of in, because of a lean misfire situation. Although it is possible to bend the plates the other way when shutting the throttle after a WFO pull, the reason I like BOVs on everything is because they obviously relieve backpressure in the plenum - and backpressure can slow the turbo down. If you like to partially close throttle between shifts, your boost level will drop without a BOV because of this backpressure.
    Frank
    POWERHOUSE MOTORCYCLES
    (631)491-6767

  14. #14
    Professional Pilot Freechance's Avatar
    Join Date
    Mar 2010
    Location
    Salem il
    Posts
    784

    Default

    So do u need to retune, to install a bov?

  15. #15
    Frank
    POWERHOUSE's Avatar
    Join Date
    Nov 2007
    Location
    east coast
    Posts
    1,809

    Default Re: Turbo blow off valve install

    Quote Originally Posted by Freechance View Post
    So do u need to retune, to install a bov?
    No . . . you don't.
    Frank
    POWERHOUSE MOTORCYCLES
    (631)491-6767

  16. #16
    Professional Pilot Freechance's Avatar
    Join Date
    Mar 2010
    Location
    Salem il
    Posts
    784

    Default

    I noticed that hks had discontinued the ssqv...but they have the sqv3 or sqv4...is the only differents in the two is the 4 is smaller?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •