Why doesnt my BOV work?

[Cadi Luva]

this is my second thread asking for help.. i recently purchased a used HKS SQV BOV it came already welded.. all i had to do was install.. well last night i replaced my turbo inlet gasket to try this thing out.. well everything is all pieced back together and running smoothly.. i have not test driven the car yet.. i will be leaving it on stands until its 100 ready for the road..

can some1 help me make this work?.. the BOV doesnt do anything.. what is the screw on the back for?.. thanks..

[themadscientist]

what does it "not do?"

Revving an unloaded motor might not generate enough pressure and vacuum to pop it. What did you hook the reference hose too?The screw on the back is to tighten the spring up and make it harder to pop open.

[Cadi Luva]

what reference hose?.. good point about the unloaded motor.. can some1 contact me through AIM @ CadiLuva?..

[themadscientist]

See the nipple?

Hook a hose from that to your intake manifold. It feeds pressure to help the BOV stay shut under boost and when you get of the throttle it feeds manifold vacuum causing the valve to open or "blow off."Without the hose connected the valve won't work right.

[Cadi Luva]

wow thanks for the 411.. do you suggest a hose to T off from? is that your own pic for reference? i cannot find anything on that SQV BOV..

[themadscientist]

pulled it off some ebay sale. I hate those things.

Directly underneath the throttle you will find a hose that originally led to the evap can. Not sure if you hooked that up when you put the motor in, but that is the best place. DO NOT tee of the fuel pressure regulator vacuum hose.

[Cadi Luva]

this is a stock ca18det in a 180sx.. i would hope if some1 could swap an engine in they would be able to answer the noob questions im asking.. lol..

BTW i already T'd a boost gauge off of the FPR.. is there anywhere easily accessible that i could T this off of? if not its a waste of a BOV.. thanks for the time and help..

[themadscientist]

The nipple right under the throttlebody is good.

[Cadi Luva]

there is no available nipple under there.. everything is plugged in.. there is 1 that goes to the intake..

i just went for a test drive and my boost gauge does not read boost it stays at about 20 vacuum.. could i have mistaken the FPR for something similar back there?

[themadscientist]

You will have to T into it. You want the hose that goes from the throttlebody over to the evap can "purge".

[Cadi Luva]

ok i cannot say thanks enough for you guys taking the time to help me out.. i am a noob..

i have a hose that runs from the intake manifold to the intake itself.. can i just unplug it from the intake assembly and slip it on the nipple?

also i need some help with my boost gauge every1 says plug it into the FPR but there are to similar FPR looking things behind the intake manifold.. i seem to have plugged it into the wrong 1.. i will post pics later.. thanks again..

[bradt]

I believe you are seeing the diaphragm for the butterfly plates. The FPR is bolted directly to the fuel rail.

[Cadi Luva]

ok so after useful knowledge you guys sent my way and the FSM.. i succesfully hooked up the boost gauge and BOV!.. here are the pics..

[dattodude]

Avoid hooking up a boost gauge or blow off valve from your FPR vaccuum line.

Hopefully you've hooked up the hose close to the throttlebody. Remember it needs to be connected to the plenum, not the intake piping in front of the throttle body. Some of those throttle body vaccuum connections are questionable as to what side of the butterfly they are on.

The vacuum of the plenum (caused by a closed throttle) is what makes the BOV open F-A-S-T.. :-)

[Cadi Luva]

the BOV hose i used was already connected to the throttle body.. all i did was unplug it from the evap can and run it to the BOV..

as far as the boost gauge.. where else should i T from?.. thats the only place i know.. thanks again..

also i my boost gauge goes up to 25ish vacuum.. and 10 boost.. is it right?
Modified by Cadi Luva at 6:42 PM 5/19/2009

[Cadi Luva]

heres a video.. is my boost gauge working right?.. i need it to work right before i install my manual boost controller..

the noise in the background is my rear tires rubbing.. they are a work in progress..

http://www.youtube.com/watch?v=GhbRswxKTZg

[Cadi Luva]

so is my boost gauge working?.. it almost hit 15 psi today..

[sjbsuperman1425]

it never went into vacuum. i have mine boost gauge t'd off the FPR and it works fine.

do you get any vacuum at idle?

[boost_boy]

it never went into vacuum. i have mine boost gauge t'd off the FPR and it works fine.

do you get any vacuum at idle?

Yeah, something is definitely not happening correctly with your boost gauge. It's a boost and vacuum gauge, yet it only shows boost? Either you have a leak somewhere or your stuff is strange, man.

Dee

[Cadi Luva]

lol.. thanks for the replies.. the gauge does show vacumm at idle.. but in the video im not idleling.. does the boost readings seem okay?.. i will install my boost controller today and slowly increase it i guess.. lol

[themadscientist]

http://www.youtube.com/watch?v..._page

I remember doing that, 20 years ago! Ah, the young days Jeezuz, I'm so old.

[Nali]

http://www.youtube.com/watch?v..._page

I remember doing that, 20 years ago! Ah, the young days Jeezuz, I'm so old.

I think everyone does that when they first get a RWD car.My first RWD was a frikkin 120Y.

[themadscientist]

My first "drift car", a 72' Opel Manta. Not mine, mine was primer.