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Can anyone explain to me what the heck this is? its a stock RB20DET BOV but whats that thing connected to it??

looks like some kind of stopepr that blocks off the passage of air out of the bov (thus removing the function of the bov altogether)

pointless really... why is it there?

if it is making a noise on gear change, then I'd say it is a one way valve of some sort.

basically allowing you to vent the stock bov to atmo.

as the stock bov stays open on idle (under vacuum conditions) if it is not plumbed back, it will suck air in through it causing the car to stall or at least not idle properly.

a one way valve will stop air being sucked in during idle and therefore allow you to have it venting to atmo making a fully sick noise bro.

is you are getting flutter in between gears, then as stated above, it will just be something that is used to block the bov off.

if it is making a noise on gear change, then I'd say it is a one way valve of some sort.

basically allowing you to vent the stock bov to atmo.

as the stock bov stays open on idle (under vacuum conditions) if it is not plumbed back, it will suck air in through it causing the car to stall or at least not idle properly.

a one way valve will stop air being sucked in during idle and therefore allow you to have it venting to atmo making a fully sick noise bro.

is you are getting flutter in between gears, then as stated above, it will just be something that is used to block the bov off.

thanks for that,

that makes sense :O

i dont know yet cause the cars still in Japan. So i guess i will have to wait until it gets here to find out. Just got a bit worried when i saw the return hose wasnt connected :O

well if i do end up getting this car it will probably be removed anyway to keep it as "legal" as possible.

not a bad option tho... better than spending hundreds on a wank factor BOV

alot of the Miata (mx5) owners in the USA do this using a BOSCH bov or a bov from a 4G63 (mitsubishi engine) when they turbo charge their MX5's.

you can buy a one way valve from hardware places.

they look a bit odd but do the trick.

nice and simple, doesn't cost an arm and a leg and still has practicalitly.

HOW THE HELL DID THE YANKS DO THAT!!! :(

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