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BOV springs

Discussion in 'Non-Turbo Tech questions' started by clark115, Jan 12, 2011.

  1. clark115

    Joined:
    Aug 7, 2010
    i just installed a tail Q BOV on a blow thru carb setup. should the BOV open with the car idling? if i rev the engine and let off the throttle the vacuum goes to almost 20" of Hg but the valve doesn't open. i have the natural spring. i think it is set for 10 psi. i think i need a lighter spring? thanks
     
    clark115, Jan 12, 2011
    #1

  2. 302f150

    Joined:
    Mar 6, 2007
    I say not open at idle because unfiltered air will be sucked in. Lots of people do it. Does it open after you build boost and let off the throttle? If it does and you get no compressor surge its fine. It takes air pushing on the valve plus vacuum to open it, revving it might not make enough airflow
     
    302f150, Jan 13, 2011
    #2

  3. clark115

    Joined:
    Aug 7, 2010
    ok i'll have to check as soon as i'm able to get to the track. hope the snow will be gone soon and the weather gets a little warmer
     
    clark115, Jan 13, 2011
    #3

  4. clark115

    Joined:
    Aug 7, 2010
    went out to the track sunday and the BOV opened like it was supposed to. ran a best of 6.24 in the 1/8 at 109. didn't get a good 1/4 pass spun the tires but the trap speed was a 131 so things are looking good
     
    clark115, Jan 17, 2011
    #4

  5. wantabe

    Joined:
    Oct 12, 2010
    mine doesn't open ??
     
    wantabe, Jan 17, 2011
    #5

  6. NME308

    Joined:
    Apr 14, 2009
    Both my turbo cars have the BOV open at idle and they do NOT suck air in!
    There is actually a stiff breeze coming out of the BOV! :2thumbs:

    Cheers,
    Jason
     
    NME308, Jan 19, 2011
    #6

  7. wantabe

    Joined:
    Oct 12, 2010
    thats lionals 'serect' method..... ssshhhhh
     
    wantabe, Jan 19, 2011
    #7
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