Jump to content
SAU Community

Boost Problem!

scottish lad
 Share

Recommended Posts

scottish lad Contributor

scottish lad

Posted
Posted

Hi Guys,

Ok, I just installed an aftermarket GFB BOV (dumps to atmosphere and recirculates) Since doing so my boost gauge, which is stock now only peaks at around 5, before it peaked above +7. I thought i had found the fault just there as i found a hole in the vaccume pipe going to black box, so i cut it back and reconnected it but still the same issue. I cant seem to hear any boost leak(dont know if you would hear it with engine running)nor can i feel any leak anywhere? Is it possible the stock gauge is f**ked or is it more likely there is a leak somewhere along the line. Just seems funny as iv just noticed it after installing BOV. I was going to get boost gauge anyway so guess when i get that i can eliminate or determine if the gauge is at fault. May also try stock valve back on 2mo to see if the problem is still there? Any more help would be great and il update 2mo after trying stock valve back on.

Cheers

James

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

Try tightening the blow off valve. Might be leaking under boost

Are you talking about the vale itself or the mounting bolts? Dont think you can tighten up the valve and the two mounting bolts are tight!

cheers

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5736212
Share on other sites
tridentt150v Grand Master

tridentt150v

Posted
Posted

STd BOV is better anyway..........no need to change it. Do a search on stalling and BOV's and see the problems aftermarket ones cause.

DVS32R was talking about the inbuilt adjustment, lots of BOV's have adjustment to increase or lower pressure release levels.

BTW you need a password to look at that pic.......use your SAU pic account - accessible to everyone then.

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5736840
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

STd BOV is better anyway..........no need to change it. Do a search on stalling and BOV's and see the problems aftermarket ones cause.

DVS32R was talking about the inbuilt adjustment, lots of BOV's have adjustment to increase or lower pressure release levels.

BTW you need a password to look at that pic.......use your SAU pic account - accessible to everyone then.

Thanks mate. Oh and i know you do get BOV where you turn the top by hand to adjust (mine doesnt do this) is this what you are talking about? Im pretty sure when i first installed it, it was making more of a dump to atmo noise, now it seems to be more of a light flutter noise????

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5737175
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

Just put stock valve back on, still under boosting but sound like when i come off the throttle its dumping to atmosphere??? This didnt do this before i changed it to the GFB BOV??? Any ideas? It could be obvious but im kind of new with regards to turbos.

Cheers

James

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5737370
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

Sorry for all the replys in a row....But when changing the BOV the only other thing i done was change the standard air box to a K and N pod filter (dont think this would cause boost problems tho.lol)

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5737391
Share on other sites
luvpsi Mentor

luvpsi

Posted
Posted

boost leak somewhere could be a gasket leak on the BOV or piping leak of some sort best thing to do is a piping leak test

heres a link of a do it yourself leak test on silvia wa

http://www.silviawa.com/forums/index.php?showtopic=41897

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5737394
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

boost leak somewhere could be a gasket leak on the BOV or piping leak of some sort best thing to do is a piping leak test

heres a link of a do it yourself leak test on silvia wa

http://www.silviawa....showtopic=41897

Thanks mate, just put installed new boost gauge and its peaking at 9psi, i think the stock gauge is just f**ked and i just started panicing over nothing. I'm still going to do this test over the weekend to make sure tho :)

Thanks Again

James

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5737738
Share on other sites
scottish lad Contributor

scottish lad

Posted
  • Author
Posted

A pod filter makes a bit more noise than a std one, you probably haven't heard your motor sucking like that before????

exactly right mate! I did know you would get a bit of suction noise, didnt expect it to be as loud as it is.

Link to comment
https://www.sau.com.au/forums/topic/359132-boost-problem/#findComment-5739401
Share on other sites

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

    • soviet_merlin
      Stagea Front CV Axle Question

      By soviet_merlin · Posted

      Man, different parts but the same numbers is terrible @dbm7! And it doesn't help that most online shops don't list the part numbers at all. They just give a list of compatible models...
    • MBS206
      R32 GTST - 600KW+ RB28/CD009 Build

      By MBS206 · Posted

      Slow when hot could also be because its getting more dynamic compression, OR things are getting a bit tighter once it is all expanded. If it were an earthing issue, typically I'd expect you to have it have issues all the time. Unless it's really a combination of both things. Where the higher compression, and things being a bit tighter, is giving that bit of extra load and you do need a slight clean up on the cables/connections.
    • dbm7
      Stagea Front CV Axle Question

      By dbm7 · Posted

      Yeah, this is one of the most annoying things about nissan part numbers... I've got an unrelated example... Image is of the AT output shaft ~ they have the same part#, but clearly the shaft on the left is beefier design to that on the right ...the difference (essentially) is the 'lighter' shaft on the right, is for engines up to RB25DE (this includes RB20 variants) : the shaft on the left is for RB25/26DET(T)....are they interchangeable? Yes...but obviously one shaft is going to be stronger than the other...and, the lighter shaft is around USD115, but the heavier shaft closer to USD150...same part#... ...epc-data usually tells a tale ~ the amayama listing for 39100-23U60 has a note "Longest side is between 60 and 105 cm" ; no such info is there for 39100-23U70 ...and given the great disparity in price between the 2 parts, it makes me at least curious (to the point of caution) where the 'extra money' went? ...ie; these 2 parts have a cost difference that (to myself at least) isn't explained by 'plastic boot'...ie; with amayama there's AUD700 price difference ...plastic versus rubber?...I'm not seeing it like that...and 60cm ~ 105cm...??...that's a huge disparity....something hinky going on here... I'd try searching by VIN, not model... /2cents
    • Duncan
      Stagea Front CV Axle Question

      By Duncan · Posted

      I don't know for sure, but I'd expect them all to be interchangeable given the diff end and hub end don't move/change between any C34 series. Often Nissan will change part numbers and the aftermarket follows those year ranges; but the original part number change doesn't mean other parts won't fit. The change could be a change in material, internal parts or even just supplier. For example, all the RB gearbox to engine bolts are no longer available and there is a new part number instead. The only change is they went from cadmium plated bolts to zinc plated due to the issues manufacturing with Cadmium. They look different but work the same.
    • soviet_merlin
      Stagea Front CV Axle Question

      By soviet_merlin · Posted

      One year is a bit concerning. Did you try contacting GSP? It says 5 year warranty on the box if I remember correctly. I'm also running their driveshafts on my S2 Stagea.   You could check the part numbers on Amayama for your year. Here's the link for my 1998 which gives the 39100-23U60 part number. Well, that and 39100-23U70. https://www.amayama.com/en/genuine-catalogs/epc/nissan-japan/stagea/wgnc34/6649-rb25det/trans/391 What does it say for yours?
×
×
  • Create New...