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Whistling Turbo

newboost

By newboost,
in Engines & Forced Induction

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newboost Rising Star

newboost

Posted
Posted

i have a r33 s2 auto and have changed the turbo over to a hypergear hyflowed turbo. when it gets on boost above 6psi it sounds like a huge whistling sound coming from it ?????? Mods so far are fmic,full 3" exhaust split fire coils and a turb o smart boost tee. I have cheched the gaskets and intercooler pipes and have got no leaks anywhere. This has become a bit of a problem some times because that is all you can here when it gets a bit of psi. does anyone else have this problem or is it normal??

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hypergear Grand Master

hypergear

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If it turns on to grinding noise it means bearing failure that causing wheels to eat in to housing. Normally due to oil contamination, insufficient oil pressure or flow.

Normally BB turbos give that sort of noise before failing.

Check for vacuum leaks.

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ARTZ Grand Master

ARTZ

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hmmm...not sounding good....although it is reason to buy a new one...was running fine tonight...in the cool air n all too...drove into city was coming home give it some stick and ...arrrgghhhhhhh....wtf is that noise...gradually got worse

I'm not exactly sure what turbo it is...I've seen standard ones and its not the same...

but rebuild or replace whats the best option

assuming its the problem

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hypergear Grand Master

hypergear

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Well there are 2x sorts of noises. one is a howling sound. This is common to BB turbos, and it gets very loud from time to time, then you have fins rubbing housings making a grinding noise, turbo stops function. You also get a small grinding alike bearing noise when power off your engine. If this is the case then the turbo needs to be taken out and looked at.

The other sound is a high pitch whistling sound. This is generally due to air pass though a small gap. could be a leaking pipe, or any gaskets on the intake system.

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ARTZ Grand Master

ARTZ

Posted
Posted (edited)

this noise is kind of like the noise a loose fanbelt makes on start-up...but alot worse..

started around moorabin ,by the time i got near frankston it was getting much worse

but only noticable with heavy throttle applied. driven normally seems fine

..hmm just took a quik spin around the block seems fine..but didnt get a chance to mash the pedal...maybe try an oil flush..is motul 3100...ok?

Edited by doozooby
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newboost Rising Star

newboost

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i have replaced all the hose clamps and silicone hose's,all the vacum hoses and have checked the gaskets and nothi ng is leaking. Oil is changed every 5k. it makes constant boost and is not loosing power. this turbo has always made this sound and now i have just got to a point were it is starting to piss me off. the turbo has only done 20k. help

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geraus Mentor

geraus

Posted
Posted

Hmm sounds like an air leak to me. I had this problem for a while with my hypergear turbo, Check your 4 manifold studs.. see if there tight.. check for anything loose , cooler piping and all. if not then it has to be oil starvation, did you change your oil feed line and bolt? because nissan come stock with an oil restriction... on the bolts..

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