no recirc valves

Discussion in 'Technical' started by rom-vg30dett, Mar 29, 2004.

  1. rom-vg30dett

    rom-vg30dett Always Broke

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    i know a guy who wants to take of the recirculation valves of his ZX. He says he wants that "really loud fluttering sound the VL's do when they change gears". I told him what that is and that its bad for the turbos. He doesnt care. Can you please tell me precisely if he would get that sound ( i think he will) if he takes off the valves and what exactly would happen to the engine if he does take them off.
    ps. why the hell doesnt he just sell me his Zed, he obviously doesnt give a S*** about it. :(
    thanx,
    Chris.:-Z
     
  2. CHILI

    CHILI Indestructable Target

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    Your friend must have a relative in Sydney>

    I saw him last night at Panthers Leagues Club Car Park. He was driving a VL with about 8 passengers (don't know why it wasn't full), and was doing about 60kph, diagonally across the parking area, and then I heard that wonderful fluttering sound.:YD :YD
    It seemed to coincide with the VL meeting an uninvited concrete garbage bin.}) }) Well, you really needed to be there I guess.^D^ ^D^ ^D^ Cheers
    Lloyd
    :-Z }D }D }D ^D^
     
  3. JimmyZ

    JimmyZ Guest

    Tell your friend to sell his car>

    he obviously doesn't appreciate it.He'd be happier, and we'd be happier, if he went and bought a VL, its obviously a better car then a Zed cause it makes that way sick flutter.
     
  4. Blipman

    Blipman Beer hooves totally work

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    Fluttering sound is made by blow off valves (n/m)

    N/M
     
  5. JETzx

    JETzx X-FACTOR

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    i dont think so

    A bov that is adjusted too stiff should make a flutter at low boost (valve does not open). If you boost hard, valve should open as it supposed to. A bov with a vent outlet too small and big boost should cause a flutter as well, i only heard of this from one person.
     
    At the end of the day any fluttering is jsut back pressure on the turbine imho. If happens with a bov then the bov isnt doing its job effectively
     
  6. JETzx

    JETzx X-FACTOR

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    He will make that sound

    with the recircs off, probably louder with more boost and bigger intercooler. IMHO it will not do any damage, if it does damage anything it would probably be the bearings. Still quite a gamble in a car like the zed where rebuilt turbos arent cheap.damage to the turbos are all unproven theories. Some people go as far as to believe that the shaft will snap or the turbo actually rotates backwards. There are lots of contradicting theories that are unproven so read them all and you be the judge.One intresting theory i read which was made by some rally team in article from autospeed is that, with a bov open all pressure is loss in the intercooler plumbing and shaft speed still quickly drops. Where as with no bov there will still be pressure in the intercooler/pipes which progressively drops as the turbo decelerates (toot toot tooot pigeon). This would mean that comming back on throttle there is still pressure present rather then having to build up pressure between the throttlebody and compressor again. Only way to see if this is true is to fit a boost gauge before throttle body and observe the difference between having a bov and no bov.
     
  7. Mr Trickle

    Mr Trickle New Member

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    stutter valves

    You can purchase stutter type BOVs which make this noise. They sound OK for a kook thing in my opinion.
     

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