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R34 Gtt Shriek Noise

Granthem

By Granthem,
in Engines & Forced Induction

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Granthem Mentor

Granthem

Posted
Posted (edited)

Pulled inlet pipe off turbo read below down the page.

Hi guys,

basically the noise its kind of like a quiet external gate with a screamer, but heres the punch... its only noticible (well really auditable) in first gear.

Car is boosting normal, all other vital signs are normal.

I can load it up in 3rd gear full boost and no noise. So im not thinking its the turbo. Im hoping its a gasket, but again i would think it would be consistant.

Either way its loudest in first.

Any ideas? It might be a gasket as its not doing very high revs when testing it in 3rd

then again, its not really noticible in second (although i think i can hear it)

any chances of it being in the gearbox, and only effecting first gear?

I did a search but it seems to be different, as its only really first gear. Which to me points to the box.

Best way to describe is a shriek, or close to an external gate with a screamer (but not that loud thank god)

any feed back would be great :cool: car is manual by the way

Edited by Granthem
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Granthem Mentor

Granthem

Posted
  • Author
Posted (edited)

Yeh. I have just been babying it around recently moving gear to my new house. Now its suddenly making this noise, but to get it to happen i need to really pin it and get it revving

Edited by Granthem
Granthem Mentor

Granthem

Posted
  • Author
Posted
Surly I'm thinking Mafia's on the sulphuric money, but why 1st gear i still think? Theres no real load, creating no real boost to = the squeal + (real boost pressure)

Stranger still...

thats exactly my thoughts aswell, its only there in first. But its definitely there. when next to another car its nearly like a screamer lol

then second its gone (i think - no where near to the same level anyway)

thanks for the thoughts guys ill check over for some leaks :cool:

Granthem Mentor

Granthem

Posted
  • Author
Posted
Maybe the engine is just scared...

:laughing-smiley-014:

Of me... never... the drivers we have around our town to contend with though... possibly.

I just cant work out why its there in first and not the others. I really gotta be revving it hard to, like probably from 5500 onwards

chrishelliwell33 Enthusiast

chrishelliwell33

Posted
Posted

i had the exact same thing happen in my old S13, was a crack in the manifold, would only do it at high revs, when the engine and turbo were hot as, forcing the crack to widden enough to let air out... check the welds in youe manifold, its a possibility it could be cracked, sounds very similar to the problem i had.

GTR-32U Mentor

GTR-32U

Posted
Posted (edited)

I had the exact same problem in my 32 when I first got it.it only did the noise in first gear. And if I dropped the boost down from 1 BAR down to .8 then it didnt do it as badly.After a year and a bit The Turbo eventually started getting the old waft of white cloud after sitting at the traffic lights so I had the turbo off and rebuilt along with all new hoses and a new dump pipe while I was at it. Never had the problem again after this.I never realised what sort of gain this all made to spool up.Fantastic!!.Just wish I changed the CAT converter as well...oh well

Edited by GTR-32U
stolen_s15 Mentor

stolen_s15

Posted
Posted
i had the exact same thing happen in my old S13, was a crack in the manifold, would only do it at high revs, when the engine and turbo were hot as, forcing the crack to widden enough to let air out... check the welds in youe manifold, its a possibility it could be cracked, sounds very similar to the problem i had.

Thats what I was thinking.

The sound you describe is almost certainly an exhaust leak somewhere near the turbo. Could be a craked manifold or dump pipe, could be loose turbo/dump/mani bolts, or could be a gasket on the edge of death. Check all those things and let us know how you go.

bubba Grand Master

bubba

Posted
Posted

My 20 gearbox was shrieking before I pulled it out.. I thought it was maybe the clutch or something but when we put the 25 box, didn't touch the clutch at all and now it's gone.

Could drive normally with no shriek but as soon as I loaded it up EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEK

Granthem Mentor

Granthem

Posted
  • Author
Posted

Yeh well having all stocko boost lines etc still attached when purchase, and ive only now raised it to 0.7 bar, im hoping the turbo has abit of life left in it. Will start pulling shit apart on the weekend, fingers crossed i find a gasket problem :(

And the first gear thing makes me think gearbox, however a mate and I listened and its just there in second.

Will pull the turbo off on the weekend and let you guys know what i find!

  • 2 weeks later...
Granthem Mentor

Granthem

Posted
  • Author
Posted (edited)

Update guys and grrrls. Pulled the front inlet pipe off the turbo last night, oh what a horrible job. Anyway, back to what I found. There are NO (sorry big typo mistake) wear marks at the front of the compressor housing. The turbo is spinning well when turned with just your fingers. Shaft play side to side is very minimal. HOWEVER. there is around .5 - 1mm of play backwards and forwards (as in pushing the wheels towards the dump pipe, pulling back etc). actually there is enough to make a small noise when doing it. So my question is how much play does everyone elses turbos have. Being ball bearing, any play at all is not good right?

Looks like it may be new turbo time. Turbo looks perfect, but its the back and forwards movement thats the worry. So basically how much is acceptable/normal on a ball bearing turbo like mine?

I have read that it will always have some side to side movement when there is no oil in the turbo, but this doesnt affected end to end movement? correct?

basically ive searched and read that end to end play = not good, but im just wondering how much is normal

Edited by Granthem

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