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High Pitch Noise

7yphon

By 7yphon,
in Engines & Forced Induction

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7yphon Experienced

7yphon

Posted
Posted (edited)

Its only just started in the last few months and Ive been switching and changing shit, the only thing left to change is the turbo, but before I do this I want to rull something out.

It only starts when the engine is under load and doesnt always happen

me and my mates have been looking for leaks and we cant seem to find any

I have also changed the belts but it seems to be comming from the Turbo side

I have pulled all the pipes of and checked the turbo for any play and its still like brand new no movement.

Now I put 10w40 Minerial Oil in my car as a test so im hoping this hasnt caused the issue I was a little worried at first.

Any Ideas I took it to hyperdrive they said turbo, but they didnt really test anything they just heard the noise, and I took it to another macanic and he said it is possable the turbo, But if thats the case what in the turbo is making the noise?

It does sometimes happen when it nutural but not all the time.

Also there are two holes on the turbo on the exhaust side, Dont know what they are for but I have put two plugs in one keeps falling out but I think I have this one it tight could this be where the noise it comming from?

Edited by 7yphon
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Mr Italy! Proficient

Mr Italy!

Posted
Posted

Mine makes a kinda whistle from the turbo side of the car since i installed the splitfire coilpacks. It only really does it when im boosting, so i'm gonna assume mines turbo related - but you say yours sometimes happens on idle...

strange

Godzilla32 Veteran

Godzilla32

Posted
Posted
Mine makes a kinda whistle from the turbo side of the car since i installed the splitfire coilpacks. It only really does it when im boosting, so i'm gonna assume mines turbo related - but you say yours sometimes happens on idle...

strange

I had a chipped turbine blade (ceramic) which made a shrill/squealing noise. Only on full throttle though. Only takes a tiny little chip on a blade to throw out balance (im guessing) and cause a noise.

Hope this helps.

Deren

kasanoff Collaborator

kasanoff

Posted
Posted

I sometimes hear a high pitched sound - always low revs and at a particular load point. If I push the throttle or ease off it slightly, sound disappears...

Kinda sounds like a feedback noise when you hold a microphone too close to a speaker...

Is that the same as you guys?

Mr Italy! Proficient

Mr Italy!

Posted
Posted

^ haha no shit, mine does the same too! This is bad, two annoying sounds in the same thread and my car shares both of them.

The mechanic told me its the grease used on the starter motor catches dust and gets stuck after its done its job - he said a rebuild will fix it, using silicon grease so it doesnt stick to dust.

But my high pitched sound is exactly as kasanoff described. Happened after the Front mount and coilpacks...

7yphon Experienced

7yphon

Posted
  • Author
Posted

Mine doesnt always happen tho and only when at full boost and when the car is under a lot of strain but yer its a high pitched noise seems like im not the only one with this sort of issue :D

also yes it is imbarrising when you go flying past a car with a screeeeeeeeem comming from the engine

gtst25 Proficient

gtst25

Posted
Posted

If it's a screaching sound when it comes onto boost I'll put my money on an exhaust leak. It's pretty common on the rb20's to leak between the exhaust manifold to turbo gasket.

If one of those bungs you mentioned falls out all the time I'll bet that's what it is.

Some guys have pulled all the heat shields off etc and have found the turbo loose and with only one nut holding it on. I had a high pitched screeching noise on my rb20 when it came onto boost and that's what it ended up being.

Cheers

dead32 Mentor

dead32

Posted
Posted

my turbo sounds like a arnold swarzeneger with his nuts in a vice, realy high pitched from bout 3500 rpm (full load) i just figured steel wheel plus 18psi would make this noise, could also be the fact the internal gate bleeds off, possibly your internal gate is bleeding off cause high amounts of boost to be leaking under presure past the wastegate plate, does your boost hold solid? what amount of boost you running?

Rolls Grand Master

Rolls

Posted
Posted

My turbo also does this, a high pitched shreiking noise. Sounds like the turbine is scraping the housing or something, Only happens when you go from zero boost to full boost very fast eg on a gear change. Sounds like a wave as well, like itll do it for half a second then fade away and then fade in again. Ive got a split pulse dump pipe as well, so its possible its just weird turbulence or something.

Im assuming its the turbo being on its last legs but Ill wait for the exhaust wheel to end up in the cat before I change it.

otto Collaborator

otto

Posted
Posted
I sometimes hear a high pitched sound - always low revs and at a particular load point. If I push the throttle or ease off it slightly, sound disappears...

Kinda sounds like a feedback noise when you hold a microphone too close to a speaker...

Is that the same as you guys?

mine does exactly the same started doing it once i put on a pod so im guessing its because of the way the air goes through the pod at that particular point causes a whistle its definatly not a problem or because anything is shagged and i wouldnt be doin any major component changes to fix it

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