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Thread: reducing boost

  1. #1

    reducing boost

    hey does anyone no of an easy way to reduce the boost on an Yamaha FZS with rive stage three kit and H1 wheel to prevent throwing a rod until I can get engine mods done.If theres a way to reduce the boost please let me know,thanks guys.


  2. #2
    RD sells a greddy adjustable blow of valve. That would do it, but you would need to do a custom install depending on your intercooler setup. I'm sure if you hunt around you could find someone else that sells a adjustable bov.

  3. #3
    abracadabra's Avatar
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    Or you could also get a T silicone fitting just off the super charger and get a general purpose pressure regulator to let it vent at whatever pressure you set it to, Julio...

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    Lightning Struck's Avatar
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    Quote Originally Posted by abracadabra View Post
    Or you could also get a T silicone fitting just off the super charger and get a general purpose pressure regulator to let it vent at whatever pressure you set it to, Julio...
    That would "kind of" work, but a supercharger moves ALOT more air than most regulators can handle.

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    abracadabra's Avatar
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    Quote Originally Posted by Lightning Struck View Post
    That would "kind of" work, but a supercharger moves ALOT more air than most regulators can handle.
    You're absolutely correct. I'm working on an electronic one with a 19MM port. Will let you know how it works, Julio...

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    mjh3ides's Avatar
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    How 'bout an easy solution: use a 160mm prop & add pitch to reduce rpm & boost.

  7. #7
    Kristian Keppel Waterholics's Avatar
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    Or how bout since you're running a stage 3 kit which has a Vi-Pec, just limit the throttle to something like 70% and at that throttle position boost should be good.

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    or do like julio said a tee peice and what about just a bleed off tap to vent off some boost or just a simple gate valve...

  9. #9
    Lightning Struck's Avatar
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    Think about this for a second... A decent sized air compressor(7hp 80gal) puts out 25scfm at 90psi.. and usually runs a 3/4" ball valve with 1/2" hose... A 1.8L at 8700RPM and 20psi of boost(35psia) is flowing 650cfm... I guess you could pull off your BOV, that might lower it a bit..

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