Jump to content
SAU Community

Bov Not Blowing Off

R32 Line

By R32 Line,
in Engines & Forced Induction

 Share

Recommended Posts

R32 Line Apprentice

R32 Line

Posted
Posted

I have just realised that the BOV on my car is not working at all. I'm pretty sure it's a HKS Sequential. I had thought (since i've had this car straight from Japan) that it was working, as the car emits a loud whistle when the accelerator is lifted - this turned out not to be the BOV though, as the car still makes this noise with the BOV completely removed from the engine bay and a straight piece of pipe put in it's place.

I have read literaly about 50 threads to try and find out what's wrong. Have already tried the adjusting screw on the back of it and even wound completely out it does not seem to work at all.

All i can think is that vacuum hose that runs in the top is not connected to the correct place.

In the pic it's where it was when the car arrived - is this correct? it currently joins the top (thicker) hose of the 2 that run to the front of the engine bay. Should i try another location ?

My intercooler piping does not have the little piece on it that lets the hose connect to it directly.

post-23664-1137409330.jpg

Link to comment
https://www.sau.com.au/forums/topic/102084-bov-not-blowing-off/
Share on other sites
R32 Line Apprentice

R32 Line

Posted
  • Author
Posted

So i guess that this (in red) is the stock blowwoff valve?

Why the heck would they leave it in if they install an aftermarket one too!!??

Is this easy to remove and block off the pipework where it's attached? Really want it off as it emits a LOUD whistle noise when the accelerator is lifted which is damn annoying.

Some of the things done with this car (straight from Japan) absolutely mystify me ( the JIC coilovers being the first - which were so friggin hard it's not funny and are now replaced with a set of Bilsteins:) and the set of actual large box stereo speakers sitting on the rear seat hooked up to the radio ( i have photo's as proof of this one) - what were they thinking?!

post-23664-1137463028.jpg

LANFOH Experienced

LANFOH

Posted
Posted

Yes you have two blowoff valves which is totally unnecessary. The standard one is all you need. The only reason I canthink of why the aftermarket BOV isnt opening is that is may be siezed, or the vacuum line has a leak or there isnt enough vacuum to reach it because of the first BOV? The reason why thay have left the standard BOV in place is so it remains plumbed back to avoid running rich I think??

R32 Line Apprentice

R32 Line

Posted
  • Author
Posted

Thanks for they reply LANFOH. I can't believe they wanted to avoid running this thing rich as according to the Apexi RSM the air fuel ratio's don't actually ever get above 10:1 and most of the time sit at about 8:1 - i am getting this tuned with the next two weeks (i'm they guy from a thread a couple of months back that gets only about 200kms to a tank).

Still would rather remove the original one if it's at all possible due to the high pitched whistle it makes. Does anyone have any info on how to do this and block it up easily?

R32 Line Apprentice

R32 Line

Posted
  • Author
Posted

as an experiment could i place a block in the vacuum hose for the stock BOV - this should then stop the stock BOV working altogether and the HKS one will work instead?

Then if i decide i do not like the HKS one or the car does not run well, just remove the block to the stock BOV and the HKS BOV completley and be back to normal.

R32 Line Apprentice

R32 Line

Posted
  • Author
Posted

For anyone curious - i did as per above with the vacuum hose to stop the stock BOV opening and let the HKS one take over.

It worked.

Car makes a flutter noise when released at low revs and a loud whoosh at high revs.

I have now decided that this is all too loud for me so the HKS BOV will be removed completely.

Thanks to everyone who help me figure this out. And i have a 2nd hand HKS BOV for sale if anyone''s interested:)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The king 2.0
      Nissan fuga 450gt android screen

      By The king 2.0 · Posted

      It is a kunfine Android screen . Does anyone know the wirering diagram of the fuga ??
    • Nizzy_R34
      r34's love to squeal

      By Nizzy_R34 · Posted

      just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • Duncan
      Engine sputter

      By Duncan · Posted

      My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Duncan
      S1 Autech 260RS Wiring Diagrams

      By Duncan · Posted

      Awesome, thanks for sharing!
    • Duncan
      Nissan fuga 450gt android screen

      By Duncan · Posted

      To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
×
×
  • Create New...