Squealing Sound When Boosting

[onboost]

Howdy all

I have an '95 r33 with a standard turbo running 12psi

Recently i have noticed when putting my foot down on the loud pedal a squealing sound that has never been there before.

I assume its from the turbo as i only hear it once it boosting

Any ideas? is it time for an up grade? and if so are high flowed turbos any good or a waste of money?

Cheers

[mad082]

could be a belt slipping. as they slip under acceleration and the more sudden the acceleration, the more slip.

[mad082]

or it could be a vacuum leak. check for split hoses.

[onboost]

Thanks for the quick reply!

I dont think its the belts, i have that problem in my other car and they dont sound the same

What hoses am i looking for?

[mad082]

any that come off the intake (intercooler piping, throttle body and plenum). just look for little splits where they mount on.

also could be a gasket is stuffed, or something has come loose, like the manifold, turbo, dump pipe, etc.

[onboost]

Thanks i will have a look

[CATKICKER]

leaking gasket!

[onboost]

what gasket am i looking for?

[dezz]

  CATKICKER said:

leaking gasket!

  onboost said:

what gasket am i looking for?

check out the turbo flange gasket...

also, try approaching boost slowly...when you get to just under 0 vacc/boost, if it makes the noise then, id say its the turbo flange gasket.

[foznice]

i had these problem on my 32 gtst when I set the boost at 14.75psi.. I thought: thats not cool.. it's proabbly wayyy to high for a 32 turbo, so I'm never doing that again...

and I never did

and the turbo lived happily ever after....... to the present anyway

[RB30-POWER]

yeah im with the leaking or blown exhaust gasket theory.

[jazza08]

If its not a gasket, it may be the turbo's trust bearing has shat itself!

Thus it will make boost but squeel loudly on boost (more boost = louder squeel)

If so new turbs/rebuild is needed.

[CATKICKER]

yeah, I would say turbo to manifold gasket has shat itself, mine did the same... bit of a te te ticking type sound as it spooled and then turbo rhaeeeerrreeeeeee'd on boost... when I pulled it off, I was missing about 2cm off the bottom of the turbo to manifold gasket!

am interested in the outcome though, do update when you find it!