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  1. #1

    Blow off valve question

    I am looking on the net here and am seeing some blow off valves for sale on ebay and what not that would fit our blow off valve port on the back of the intercooler and there are some that are going for some good prices

    I know R&D has one for sale but money is a little tight now and cand afford to drop $400 for a BOV so I am looking at a cheaper route

    My question is all I see are BOV's that have a vaccum fitting and I know the BOV that is on our 250x's that everone is either blocking off or replacing does not have a vaccum fitting...will a BOV that has a vaccum fitting still work if the vaccum line is not hooked up ?

    I see some that are for sale that say that can be set up as a "blow off valve OR bypass valve" what is the diffrence ?

    I am guessing that a blow off valve is when using the vaccum line and a bypass valve is when the vaccum is not hooked up ??

    I am running the stock BOV now and have been ever since I got my new engine put in over the winter due to a major connecting rod failure...but I know that stock BOV is not performing up to par and I do not want to go back to the block off and am weighing my other options

    So any help would be great

    Thank You
    Last edited by Ultra250xryder; 05-03-2008 at 09:03 PM.


  2. #2
    Silence! I Keel You! earthshaker's Avatar
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    Must be spring loaded and adjustable to OPEN under pressure...I think the new 08 manual indicates 11.4 PSI . The R&D unit has a port on it as well so it's likely it operate both ways....Marc K was going to have the R&D unit shipped to me to calibrate, but that didn't happen ( i think he was going to send me some internal pics too )

    The stock one opens under pressure only. It is a redundant unit for those that have had the relief valve vac tube come off or forgot to reinstall - a safety if you will.

    I guess there have been some stock intercoolers "fail" for whatever reason. (probably water pressure) See description on RRated site for their up and coming replacement unit.

    The next 10 post will probably tell you to block it off.

  3. #3
    Beagleman62's Avatar
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    [quote=earthshaker;627952]
    The next 10 post will probably tell you to block it off


    Yep......
    Block that sucker off.

  4. #4
    tomgtv's Avatar
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    Block it off!

    Some of us down here have had that BOV blocked off for almost
    a year and as much as 100 hours......zero problems......I wouldn't
    spend no more than R Rated's $10 plate......One of our guys just
    fabed a piece of aluminum and inserted it between the BOV and
    the Intercooler.....hey that would even pass warranty inspection
    as all the stuff is there looks all OEM! I like being able to take
    off that big hose snaking to the air box from the BOV.

  5. #5
    Silence! I Keel You! earthshaker's Avatar
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    See the attached 07/08 manual...it has been modified some like i spoke about last year. Valve should not allow air to pass before 11.74 - 11.8 PSI. I say test your valve...if it leaks (most likely it does...I've tested about 10 of these ranging from early 07 to recent 08 - same part number - all leaked before 8 psi, most leaked at around 4 psi)

    The manual is crystal clear - Kawi is to replace the valve if it does not pass.

    For all of those that blocked it off, why not take it down to have it tested by your dealer and have them provide you one that is in spec?

    I'd be happy to test it for you and provide the value it begins to leak.

  6. #6
    Silence! I Keel You! earthshaker's Avatar
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    07-08 manual pages
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