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Old 11-03-2001, 02:42 AM   #1
DanMan
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Default Turbo on its way out?

My turbo is screaming any time it sees boost... I mean a horrid hissing sound thats as loud as a crappy civic exhaust (echoes through the neighborhood)

I'm pretty sure I'm over-reacting, but I have quite an odd problem. I changed back to my stock boost-controller from an MBC tonight. I felt like the car was pulling back timing to much, so I wanted to try stock to remind myself of what it felt like.

When I went out for a drive, the turbo started shreiking as described above. I am sure its the turbo making the shreiking noise.

I observed the amount of boost boost (Greddy tapped off of BPV) and noticed sound occurs only at 0bar or above. It starts right at 0bar and gets progressively louder all the way to the 1 bar peak (bost stock and MBC). One would think it was a leak, but the car is not running ANY LOWER boost than before. Spool also appears to be unaffected.

The same exact noise occurs with either the MBC (which worked fine before) and the stock solenoid. I have no idea what to think other than something is mechanically wrong with the turbo. It's just so odd that no other parameters seem to be affected. The car runs fine as well.

I also have an uppipe installed on the car. I believe it has been leaking slightly at the manifold/uppipe connection. I can hear the gasket flaping around between the flanges (I reussed the stock gasket... bad idea). However, it has always been hardly audible. And I don't see how a on-boost only noise could be caused by any part of the exhaust.

Anybody... please

Dan

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Old 11-03-2001, 03:07 AM   #2
totoherbs
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Quote:
My turbo is screaming any time it sees boost... I mean a horrid hissing sound thats as loud as a crappy civic exhaust (echoes through the neighborhood
sounds like the turbo death whine
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Old 11-03-2001, 05:03 PM   #3
DanMan
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B to the U to the M to the P!
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Old 11-03-2001, 06:52 PM   #4
nhluhr
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are you sure your boost gauge hasn't developed a leak?
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Old 11-03-2001, 07:22 PM   #5
bottlefedwrx
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Sounds like what my car was going through last month. I thought it was a small vacuum leak, but it turned out that my turbo blades were bent and scraping the side. You should really get that checked out.
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Old 11-03-2001, 11:18 PM   #6
DanMan
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ok, its getting much much worse. I have to stop driving the car.

PE1818, injectors, and unichip here I come.

Dan
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Old 11-03-2001, 11:52 PM   #7
alfriedesq
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Quote:
Originally posted by DanMan
ok, its getting much much worse. I have to stop driving the car.

PE1818, injectors, and unichip here I come.

Dan
get the 1820 - - -1818 is weak!
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Old 11-04-2001, 12:02 AM   #8
DanMan
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Says who?!?!

I thought it was the same damn thing essentially... just different A/R.

Dan
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Old 11-04-2001, 01:23 AM   #9
Twelvz
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I shouldn't have read this post, you guys get me paranoid !

My car hiss' a lot when approaching 15psi, I took the silencer out, that may have something to do with it, but I don't think my turbo is going out (better not b/c its a IHI VF22).
This loud hissing seems normal to me, I have no leaks and I have yet to install my up-pipe.
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Old 11-04-2001, 01:29 AM   #10
totoherbs
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hissing is different from the whine of death it sounds like a owl screaching almost.
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Old 11-04-2001, 01:30 AM   #11
alfriedesq
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Quote:
Originally posted by DanMan
Says who?!?!

I thought it was the same damn thing essentially... just different A/R.

Dan
Take my word,, I know - - - 1818 is weak over 5,000 and just spools a tad quicker
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Old 11-04-2001, 01:36 AM   #12
Twelvz
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Good...
Its definitly just a hiss... whine

I'm like a hypocondrac (sp?) when it somes to my cars !

Rob
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Old 03-28-2002, 11:22 AM   #13
Motorush
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Default more on hissing

what if the hissing sound became louder and irregular at full boost, almost like if the hissing was also flapping. I also hear my turbo spinning at steady highway speeds much luder than before this "irregular hissing" started. my wrx has spent 3 days at the dealer, and nothing, the sound is still there, not to mention the fact that I strongly believe I'm loosing power.

thanks.
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Old 03-28-2002, 02:07 PM   #14
Evaider
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Default Re: more on hissing

Quote:
Originally posted by Motorush
what if the hissing sound became louder and irregular at full boost, almost like if the hissing was also flapping. I also hear my turbo spinning at steady highway speeds much luder than before this "irregular hissing" started. my wrx has spent 3 days at the dealer, and nothing, the sound is still there, not to mention the fact that I strongly believe I'm loosing power.

thanks.

Are you loosing power... or just getting use to the power you have? Hehe.. when I first got my WRX i was like woah this is so fast... now im like eh.. its ok. hehe. I want faster! faster! more power! sigh.. but I have no money.
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Old 03-28-2002, 02:21 PM   #15
kurichan
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Check for leaks! It sounds like this happened when you removed your MBC. I'll bet a hose is loose.
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Old 03-28-2002, 02:27 PM   #16
krave
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Sounds like a good incentive for upgrdades
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Old 03-28-2002, 02:38 PM   #17
Motorush
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Default Re: Re: more on hissing

Quote:
Originally posted by Evaider


Are you loosing power... or just getting use to the power you have? Hehe.. when I first got my WRX i was like woah this is so fast... now im like eh.. its ok. hehe. I want faster! faster! more power! sigh.. but I have no money.
I know what you mean evaider, I really wish is was that but unfortunately I don't think this is the case. - thanks for the note though, it helps lighten-up the suffering.

kurichan, I'll keep doing that, thanks.

In a nutshell and thanks to all the input I've gathered from members of the i-club, this is what I'm going back to the dealer with:

PROBLEM DESCRIPTION
=================
- Abnormal hissing noise (irregular and louder) under full boost (includes flapping sound).
- Experiencing less power overall, almost seems like wrx is now more engine, less turbo.
- Steady and now pronounced turbo whine at steady highway (70mph) speeds.

PROBABLE CAUSES
==============
- Loose colector to up-pipe bolts.
- Bad EGT Sensor under turbo.
- Loose Ceramics in pre-turbo Cat.
- Compression loss.
- Air Intake System leakage.
- Hoses, connections, or manifold.
- Turbo blades bent, scraping the sides.
- Wastegate Valve problems.
- Solenoid problems.
- Gasket in the up-pipe to manifold flange leaking.
- Up-pipe catalist.

Let's see how this goes. Remember that my WRX is reading 1600 miles and is completely stock except for the kartboy sshifter and cusco bushings.

Thanks.
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Old 03-28-2002, 04:28 PM   #18
nicktckhoo
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loose uppipe dude.

I had the same problem. It is sorta a rattling like noise. Turbo whine doesn't sound bad. This sounds bad.

B4 you conclude turbo problems, I would just get underneath the car and check the uppipe. Don't dread it , just do it.

Cheers

Nick
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Old 03-29-2002, 12:01 AM   #19
motoxphil
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Default Double check your uppipe!

An uppipe leak can sound like the screach of a bad turbo. It's worth a second look. Check for signs of carbon build up around the center of the joint.

We have experienced this first hand while doing custom tunes.

Good luck and I hope it's your uppipe!

Phil
TurboXS
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Old 03-29-2002, 01:08 AM   #20
Sauceboy01
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check your EGT probe on the up-pipe.. i'm experienceing that problems right now.. i looked at the pipe and the prope wasn't even there anymore.. (just hanging)
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Old 03-29-2002, 10:22 AM   #21
WizardBlackWRX
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I would say it is a loose uppipe. Think of it this way


flapping hiss: the leaking joint with a gasket oscillating like a reed on an instrument.

more engine than turbo: you are losing your air to the turbo to spool it and getting less overall.

steady and pronounced turbo whine: you have a leak close to the turbo to let more turbo sound escape to the environment.
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Old 03-29-2002, 11:04 AM   #22
Motorush
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Default thank you

excellent feedback, thank you.
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Old 04-04-2002, 10:01 PM   #23
Motorush
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Thumbs up My WRX is Back!

Thanks to all for that feedback and special thanks to TAV Racing in Miami, FL. They did an awesome job! Got the Boost back! the flapping is gone! and an excellent cusco bushing (lock-tight and all) installation to boot.

Leaking gasket in the Uppipe-to-Manifold area , a couple of loose connectors.

To all in the South Florida area, keep this guys in mind, after 5 days and two Subaru Dealers, I can guarantee no one will take care of your WRX like these folks. A+ TAV Racing Website

Gabriel.
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Old 04-05-2002, 04:10 PM   #24
WizardBlackWRX
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Hey, just got my PC up and going again. Glad to hear it worked out with minimal $.



Happy Boosting
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