Jump to content
SAU Community

Stock Bov Not Working Properly

mikel

By mikel,
in Engines & Forced Induction

 Share

Recommended Posts

mikel Community Regular

mikel

Posted
Posted

I have an R33 GTST with the factory plumb back BOV and a Pod filter.

Over the last 2 days I've noticed the BOV doesn't fire at all under gentle driving and only fires a little bit under harder accelleration.

Where the BOV usually triggered, instead I hear a fluttering sound I assume is caused by the excess pressure not released by the BOV going somewhere like back through the turbine.

I have not modified anything.

None of the vacuum leads are disconnected or obviously cracked or perished.

Is the factory BOV a serviceable item?

Is the factory BOV able to cope with 1 Bar of boost (I've been running 1 bar with a HKS 25/30 turbo since I bought the car 6 months ago) ?

Is it more likely to be the BOV or something else?

Is it the ECU that triggers the BOV?

will it damage anything if I drive it hard? - I assume lots of back pressure on the turbine can't be good.

cheers

Mike

Link to comment
https://www.sau.com.au/forums/topic/165211-stock-bov-not-working-properly/
Share on other sites
uraah Enthusiast

uraah

Posted
Posted

take the bov off and have alook at the piston and see if u can push it up if not then maybe its ceased dunno if there a serviceable item but u would probably find one in the for sale section for cheap enough if ur boost pressure was to high ur bov would leak not stay shut and no ur ECU dont controll ur bov pressure opens it when ur throttle body closes

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

    • joshuaho96
      New R32 owner soon

      By joshuaho96 路 Posted

      Hard to say, just pop the rocker covers off and have a look if you think it's cammed. You probably need to replace the valve cover gasket/half moons anyways.
    • niZmO_Man
      R32 Nostalgia

      By niZmO_Man 路 Posted

      From my youth: GTi-R clutch change is a massive pain. The gearboxes are fragile? But the car is super cool and I want one 馃槩 
    • niZmO_Man
      New R32 owner soon

      By niZmO_Man 路 Posted

      Remember this is 1988 tech.
    • TurboTapin
      R32 GTST - 600KW+ RB28/CD009 Build

      By TurboTapin 路 Posted

      Driveline vibration is resolved. I ended up loosening all my engine mount and trans mount bolts, giving it a good shake then retightening everything and it's gone... Let's just say I was surprised that fixed it.  I've been happily driving it around again but unfortunately put zero time into my direct port/constant pressure WMI setup. I'm on vacation next week, so I'll try and finalize it then.  On a different note, I spent all week fuel/ignition mapping 2x 216L V16 engines. Turbo's were burning glycol and we swapped them out for larger units. We also had planned emissions testing on site, so I figured I'd be there the same week to use their instrumentation and massage any emissions issues out if needed. This was a first for me. Fuel management is similar in certain ways to automotive (i.e air density as load variable) but very different in others. It's all PLC based and AFR's are controlled by air and not fuel. They use a control valve between the turbo and air manifold to control pressure which in turn controls AFR's. Due to this, target AFR tables supplied by the OEM are in pressures and not mass which really through me off. They use air pressure vs fuel pressure tables. I also relied on an O2 concentration sensor the emissions team had in the exhaust. Ignition timing was also all over the place and we were losing a fair bit of power. They're now happily sitting at 16-40BTDC depending on load. We were making about 1600kw at 900rpm at 90% load. Engines were running a lot smoother as well.    
    • Duncan
      1992 R32 GT-R Race Car

      By Duncan 路 Posted

      heh, aint no R32 ever meeting modern targa cage rules unless the driver is veeeery short OP, good luck with the sale, since its already in the land of freedom I'm sure you will find a good buyer.
脳
脳
  • Create New...