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Old 10-13-2014, 04:27 PM   #1
Serkan
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2004 Sti
WRB

Default Noise from turbo at idle

Need help diagnosing a noise. It is a 2004 wrx with sti mods (intercooler, injectors, exhaust ...)

I swapped a leaking vf30 with a used vf34. The turbo did not have shaft play or sign of failure.

I installed the turbo. It doesn't smoke, pulls nice but I get this weird noise. I am not sure if it is coming from turbo itself or an uppipe leak.

I can hear the noise in the cabin when accelerating from stop (or accelerating after a turn) but can't hear anything in high boost when I step on the pedal.

The noise is not there if I keep the wastegate open manually and rev it while idling.

And it is not transmission, a/c, ps pump, alternator related.

https://www.youtube.com/watch?v=bKJM7gO4lx8
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Old 10-13-2014, 11:52 PM   #2
Brother EddieJ.
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Ball bearing turbo. I'm guessing that's the noise you hear. Can't pull up video gov computer.
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Old 10-14-2014, 12:13 PM   #3
Serkan
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Quote:
Originally Posted by Brother EddieJ. View Post
Ball bearing turbo. I'm guessing that's the noise you hear. Can't pull up video gov computer.

Yea, seems like it is common for vf34 turbos to make that whine. I searched "vf34 whine" on google and lots of threads showed up.

It actually sounds cool, as long as there is nothing wrong with it.
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Old 05-13-2019, 06:44 AM   #4
zoukieee
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Did this ever get rectified?
I'm experiencing exactly the same on a VF42
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Old 06-15-2020, 08:40 PM   #5
magicmarker18
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sam...did you find out?
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Old 06-17-2020, 01:40 PM   #6
Samurai Jack
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I never heard that sound when I had a VF34 but then I never tried or had a need to look for it either in 100,000 miles.
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Old 06-18-2020, 11:00 AM   #7
subaru_gc8
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my vf23 used to make the same sound. its the ball bearing turbo noise

Quote:
Originally Posted by Samurai Jack View Post
I never heard that sound when I had a VF34 but then I never tried or had a need to look for it either in 100,000 miles.
may be you just never noticed it...or your 34 wasnt really a 34
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Old 06-18-2020, 11:30 AM   #8
Samurai Jack
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Quote:
Originally Posted by subaru_gc8 View Post
may be you just never noticed it...or your 34 wasnt really a 34
Yet again you are making statements about things you know absolutely nothing about.
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Old 06-18-2020, 12:24 PM   #9
subaru_gc8
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Quote:
Originally Posted by Samurai Jack View Post
Yet again you are making statements about things you know absolutely nothing about.
maybe but the 34 is a ball bearing tubor with a RHF5HB chra.... it should make the ball bearing noise.... I could probably say the same about you. or do you think you're the only turbo out there that doesnt make that noise?
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Old 06-18-2020, 01:27 PM   #10
Samurai Jack
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I never said that my VF34 was the only one that doesn't make that noise. I said
Quote:
Originally Posted by Samurai Jack
I never heard that sound when I had a VF34 but then I never tried or had a need to look for it either in 100,000 miles.
Pretty clear to me what I did and didn't say.

Which also begs the question, " Why is the OP, or anyone else for that matter, revving the motor without putting a load on the engine like that just to hear their turbo whine? "

One can find all sorts of " suspicious noises " in their car, all they have to do is go looking for them and then think they have an issue which never existed.
We see lots of " What is this noise " posts when it is just a new owner panicking over something they think they hear / heard which turns out to be absolutely nothing.

Last edited by Samurai Jack; 06-18-2020 at 01:59 PM.
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Old 02-16-2021, 10:22 AM   #11
Serkan
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Quote:
Originally Posted by Samurai Jack View Post
Which also begs the question, " Why is the OP, or anyone else for that matter, revving the motor without putting a load on the engine like that just to hear their turbo whine? "
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