Jump to content
SAU Community

Harsh Induction Noise At Around 5,000rpm

munchstagea
 Share

Recommended Posts

munchstagea Mentor

munchstagea

Posted
Posted

Stagea RB25DET stock as a rock.

Harsh induction noise at around 5,000RPM sound is similar to a fan belt slipping or loud air leak, have all the belts as tight as you would want them. Sound seems to be coming from turbo area, only at high RPM with a stab of throttle in Neutral. Happens on the road too when kicked down (auto box).

Have unplugged the BOV to see if that was where the sound was coming from but no luck, only just coming on to boost but it is definitely down that path somewhere. The car is freshly imported so has come to me with this problem so I can't shed any light on how it may have developed.

I am not going to flog it to see what happens, just wondered if any turbo experts out there could throw a suggestion in the ring? My Dad is a mechanic but has very little experience with turbos (I have less!), we are not sure where to look and want to avoid major pull downs for something that may be simple.

Any recommendations for a Turbo workshop in the Geelong area would be great too? Would love to have someone that knows their stuff have a look and listen...

Cheers

Luke

munchstagea Mentor

munchstagea

Posted
  • Author
Posted
would this be like a screaming sound?

I wouldn't say screaming... loud like a belt slip but not "holy crap, what's that?" loud... It doesn't sound right but not catastrophic at the same time...

Luke

QRI05E Mentor

QRI05E

Posted
Posted

Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe :ban: that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go..

Regards,

Sarkis

stolen_s15 Mentor

stolen_s15

Posted
Posted (edited)

Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this.

Cheers

Nick

Edited by stolen_s15
munchstagea Mentor

munchstagea

Posted
  • Author
Posted
Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this.

Cheers

Nick

Will be investigating pipes and possibly manifold and turbo to exhaust gaskets, don't want it to be a turbo bearing!!! I have only driven it 40km and it's not even on the road yet... :ban:

It's doesn't scrape on anything, pretty stock height but the car is new to me, no existing damage underneath so I think I am pretty safe there.

Great advice guys, keep it coming.

Luke

munchstagea Mentor

munchstagea

Posted
  • Author
Posted

To add to this, another question: In neutral, slowly bring the revs up to 3k, should I see boost?

I see vacuum, but do get some boost when bringing revs up quickly with a reasonable, not to aggressive stab of the loud pedal...

Luke

munchstagea Mentor

munchstagea

Posted
  • Author
Posted
are you getting any error codes from the consult port (assuming you still have a stock ecu)??

Stock ECU, stock everything as far as I know, have not gone down that path yet.

you will only get boost in neutral if u really punch it. there is no load to bring the boost on.

Really? That's very good to know, so if I "stall it up" I should see boost? Will try that tomorrow.

Cheers

Luke

mad082 Grand Master

mad082

Posted
Posted

thats one advantage of turbo's over superchargers. in a manual turbo if you miss a gear and rev it out there is little boost, where-as in a supercharger if you miss a gear the engine still cops full boost. thats why holden never made the supercharged v6's in manual.

Tangles Grand Master

Tangles

Posted
Posted

Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of.....

damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it :ban:

munchstagea Mentor

munchstagea

Posted
  • Author
Posted
Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of.....

damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it :P

All stock air box etc.

Yeah I know dramas, will get it sorted, don't have a choice!

Luke

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe :( that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go..

Regards,

Sarkis

Well considering he says it does it in neutral... and a screamer/wastegate wont open in neutral

its fair to say that its got nothing to do with a "screamer" pipe

ICER33 Community Regular

ICER33

Posted
Posted

mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league).

either way there are both off fyans street.

good luck

munchstagea Mentor

munchstagea

Posted
  • Author
Posted
mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league).

either way there are both off fyans street.

good luck

ICER33

Thanks for the info, I will look them up, would be nice to have a trained ear have a listen before I get too carried away...

Cheers

Luke

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

    • Kinkstaah
      What brakes on R34 GTT(Europe)

      By Kinkstaah · Posted

      Welcome to Skyline ownership. Yes, it is entirely possible parts websites get things wrong. There's a whole world of inaccuracies out there when it comes to R34 stuff (and probably 33 and 32). Lots of things that are 'just bolt on, entirely interchangable' aren't. Even between S1 and S2 R34's. Yes they have a GTT item supposedly being 296mm. This is incorrect. I would call whoever you got them from and return them and let them know the GTT actually uses 310mm rotors. Depending on where you got them from your experience and success will obviously vary.
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • niZmO_Man
      Lock up the old for sale / wtb threads.

      By niZmO_Man · Posted

      Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
    • Kinkstaah
      R34 Gtt Wheel Offset Advice

      By Kinkstaah · Posted

      This is a recipe for disaster* Note: Disaster is relative. The thing that often gets lost in threads like this is what is considered acceptable poke and compromise between what one person considers 'good' looks and what someone else does. The quoted specs would sit absurdly outside the guards with the spacers mentioned and need  REALLY thin tyres and a LOT of camber AND rolling the guards to fit. Some people love this. Some people consider this a ruined car. One thing is for certain though, rolling the guards is pretty much mandatory for any 'good' fitment (of either variety). It is often the difference between any fitment remotely close to the guards. "Not to mention the rears were like a mm from hitting the coilovers." I have a question though - This spec is VERY close to what I was planning to buy relative to the inboard suspension - I have an offset measuring tool on the way to confirm it. When you say "like a mm" do you mean literally 1mm? Or 2mm? Cause that's enough clearance for me in the rear :p I actually found the more limiting factor ISNT the coilover but the actual suspension arms. Did you take a look at how close those were?
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      @GTSBoy yeah sorry i know thery are known for colors bud those DBA are too in colors 🙂 Green will be good enough for me  
×
×
  • Create New...