Jump to content
SAU Community

Screaming On Boost!!

drifto

By drifto,
in Engines & Forced Induction

 Share

Recommended Posts

drifto Collaborator

drifto

Posted
Posted

My turbo is screaming when it reaches the set boost level.

Makes normal spool up sound while getting there but makes a horrible sound on full boost.

I've varied boost from 10psi to 18psi and the sound is only there when it has reached this level.

Power has not been lost, oil pressure/level and quality are good.

A local workshop suggested that the shaft bearing may be loose or worn and the exhaust wheel is touching the housing????? Either that or it's a blockage in the oil feed line and the noise is from the bearings running dry.

To anyone with knowledge does that sound right or should my turbo have blown up by now???

Could it be something to do with air getting in or out of somewhere it aint supposed to?

The Turbo is an old HKS T3G with an internal wastegate.

Link to comment
https://www.sau.com.au/forums/topic/15227-screaming-on-boost/
Share on other sites
Dawzey Collaborator

Dawzey

Posted
Posted

yeah happened to me and it ended up losing boost and the flow out the end stopped.

i just high flowed the trurbo and it works fine now

but there was not much movment inside the turbo and it looked fine from outside.

but get it looked at and rebuilt.... but do it before u start losing boost. cos it wil happen if the same prob as mine

at first it would only happen at high boost but then slowly worked it way down and then boost would come down with it.

cheers

drifto Collaborator

drifto

Posted
  • Author
Posted

Thanks to all for your replies.

Doesn't sound good. This may be the start of some serious rebuilding.

It's definately not a belt. Time to rip the Turbo off I guess. Maybe I'll find out now what a HKS T3G is. I now it's been good for over 200 rwkw so a bit of rebuilding might see more.

Cheers fellas

Lozza150 Proficient

Lozza150

Posted
Posted

Could it be your exhaust manifold. Mine schreeches at 6,000 rpm (not bad) just noisy. The guy's said some manifolds come lose after time, so the air escapes and makes that noise.

It might not be the problem, but it's one to keep in mind....

Cheers

Loz

matlowth Proficient

matlowth

Posted
Posted

Lozza150's right on the ball. The screaming noise you're hearing is air escaping from between either the exhaust manifold and the block or the exhaust manifold and the turbo. My car did the same thing, you'll probably need to unbolt it, replace the gasket and re-bolt it back up.

Cheers,

matt

matlowth Proficient

matlowth

Posted
Posted

Adam,

Yeah but his car doesn't seem to have any problems making boost, which would indicate that there isn't any damage to the turbo...

I've had a busted thrust bearing on a different turbo which caused the compressor wheel to grind itself into the housing... This didn't even make any noise, the car just wouldn't make the same amount of boost!

matt

turbomad Community Regular

turbomad

Posted
Posted

I agree that it sounds like an exhaust gas leak, a friends VL turbo made a similar noise, he took it to a so called turbo mechanic who said it's rebuild time, before that he thought he'd check it over himself and discovered that the bolts from the turbo to the manifold were loose, I believe the turbo shop would have thought that all along and would have recieved $800+ for simply tightening a few bolts.

Lozza150 Proficient

Lozza150

Posted
Posted

the worst part is most of the cost is to take off all the bits to get to the manifold.... you may as well Hi flow or rebuild the turbo while it's off.

Well that's what I'd do... Hence why i'm not going to fix the exhaust leak till i can afford to hi flow the stock turbo...or fit a HKS gt2540.... (Yeah right)

Loz

drifto Collaborator

drifto

Posted
  • Author
Posted

Cheers again for your replies. I believe it is more along the lines of a gasket leak too.

I'll have a good look Saturday and post back what I find for any other people curious.

By the way my Turbo aint stock and I don't think HKS would approve of someone going to their handy work with an air grinder.

A rebuild maybe, but if it comes off I'm hoping it can go straight back on again.

I'm getting really toey running around town without letting it build any boost.

The slightest hint of waistgate chatter is enough to get me going. ch ch ch ch ch to to tooo.

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

    • Ben_D
      Wanted to buy R200 longnose LSD 3.9 ratio

      By Ben_D · Posted

      Hi all,  I am in the market for an R200 longnose diff out of a Z31 300ZX, or S12 RSX, DR30 skyline, or similar, in a 3.9 ratio.  Preferably a late model one with the M12 crownwheel bolts.  The only easy to find advert for one of these was my ad back in 2007 when I sold it on this forum.  I sold the diff as I had sold the car it goes to, but as it turns out, after 18 years I got the car back late last year, so now I'm looking for the diff !  If anyone knows where to find a longnose R200 LSD with the M12 crownwheel bolts, drop me a line at [email protected] - Bonus paid if soomeone comes up with the original diff (stranger things have happened !).  Cheers   Ben D    
    • Ben_D
      Back for more after 18 years - and where are the longnose R200 LSDs?

      By Ben_D · Posted

      Hi everyone, I used to post here a bit from 2004-2013, when I owned various Nissans, in particular my S12 RSX gazelle, which was sold in 2007.  As luck would have it, after an 18 year hiatus, the car found its way back to me last year, and over the past 11 months I have had the pleasure of restoring it with my kids.  One thing that I am after in particular is a 3.9 ratio R200 LSD for it.  I actually sold the one out of the car here back in 2007 , and it would be incredible if I could track down who I sold it to, so I can see how they have progressed over the years (and to be honest, to see whether I can get the diff back !).  Anyways, hi all and let me know "where are the R200 Longnose diffs all at these days ?  Cheers Ben D  
    • sonicii
      G35 Control arm and Compression Rods into a V35 Skyline.

      By sonicii · Posted

      Arms will be the same as the G35 or 350Z, but as above, there was a change in the lower control arm where it connects to the ball joint.  That said, you can remove the ball joint cone from your old ball joints and fit them to the new ball joints.  To be honest, I didn't think the ball joints themselves were different. The main ball joint is a bit awkward to replace, you really need to remove the steering knuckle to press out the old one.  Some people have used tools to remove it in place, but it just seemed too hard to get to. If you are going to press out/in that ball joint, then you may as well just replace the bushings in the LCA and the compression rod.  You can buy the compression rod bushing from Nissan, but the LCA bushes, you will need to go aftermarket. Much cheaper than buying the whole arm.
    • Erelyes
      Ceramic turbine damage to engine - what did yours do?

      By Erelyes · Posted

      Ha, well, it's been.... a bit of a journey. Things have taken much longer than I'd hoped. I'll probably put up a thread at some stage. Hopefully soon. The car's not done any kms since my update in June though, put it that way.
    • Dose Pipe Sutututu
      M35 Aftermarket Fuel Pump

      By Dose Pipe Sutututu · Posted

      Here's the chart for fuel pressure vs. current draw, assuming your base fuel pressure is 3 bar and you run like 0.5bar boost on WOT, you should only momentarily hit 9amps here and there. (Ignore my prev post, I cannot read a chart these days it seems)
×
×
  • Create New...