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Old 12-01-2003, 06:11 PM   #1
flyinwrx
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Default Is this a bad noise

All right...here's the deal. This past weekend I put on a manual boost controller, turbo xs uppipe, and K&N filter (removed resonator). The work was done by a qualified mechanic who has a WRX of his own and has modified his extensively. However, he's out of town and I have this noise now that's freaking me out. I never exceeded 15 psi of boost, so I assumed at first that it was airflow associated with the removed resonator; thus, I reinstalled my stock filter and resonator, but the noise persisted. I read a bunch of forums about "wastegate flutter" already but couldn't find the answer. The mods I listed are the only ones I have. THE NOISE: occurs when accelerating into boost around 3200 rpm. It is a high-pitched noise that's hard to explain. However, it stops when I let off of the throttle. I can keep the rpm's constant at any rpm and the noise isn't there. Everyone who mentioned a similar noise to this had an aftermarket BOV, so I'm left wondering what it could be. Can anyone help me?
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Old 12-01-2003, 06:13 PM   #2
wickedwrx
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I would say exhaust leak from installing the up-pipe. I would check that first.
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Old 12-01-2003, 07:01 PM   #3
mkultra69
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Dito on the uppipe.
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Old 12-01-2003, 07:18 PM   #4
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If the sound is a high-pitched shriek, it's probably an uppipe exhaust leak since none of the other mods would make this noise.

--
0==WW==0
"…axles of evil…" - george w. bush
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Old 12-01-2003, 07:49 PM   #5
flyinwrx
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What is the easiest way to check that uppipe leak? The turboxs uppipe we installed was used and we had to go to an Advanced Auto Parts to pick up some manifold studs. When hooking the downpipe back up we had to bend the gasket a little to fit over the new studs because they were about a millimeter too long. Still, there should have been a good seal on that. The high-pitched shriek has a kind of fluttering inconsistency to it that sounds like it could only be made by the turbo spooling up. Is ther anything else I could check?
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Old 12-01-2003, 07:53 PM   #6
Johnzim63
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!!! YOU HAVE A [color=dark-blue]UP-PIPE[/color] [color=dark-red]LEAK[/color] !!!
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Old 12-01-2003, 08:09 PM   #7
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Yes, it might be something else, and maybe someone will have a suggestion. I'm just going by your recent mods. There's no easy way to check for the uppipe leak that I know of.

I know it's a biatch to tear it apart again, but leaks do occur with non-flex uppipes, just not every time. My uppipe has a very slight leak when cold, but goes away (I think) after about five minutes of easy driving. If I ever get around to re-doing it, I will use a premium-quality gasket set. I think Suby Dude also offered a gasket set but I couldn't find it on his site.

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Old 12-01-2003, 08:19 PM   #8
flyinwrx
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Thanks Wingless Wonder...I'll just rip it all apart again when I get the time in the next couple of weeks. The biggest thing I care about though, does this harm my turbo or engine in any way or is it simply performance loss?
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Old 12-01-2003, 09:06 PM   #9
flyinwrx
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I talked to my buddy tonight and he said he thinks he experienced the same thing in his WRX. His suggestion was that I probably need to remove my wastegate, but can only do so with the full aftermarket exhaust. Comments?
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Old 12-01-2003, 09:36 PM   #10
big_adventure
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You MAY just have wastegate flutter - it's common. Is your problem only at very low boost levels? It seems that most wastegate flutter happens between say 1-5psi, but goes away over that. If it's at full boost, though, think uppipe.

Go to the subaru dealer and buy two new gaskets: for the top and bottom of the uppipe. Spend three hours (less if you've done it before...) yanking the uppipe and replacing it with new gaskets. Follow the vishnu or perrin instructions for reinstalling the uppipe, and FOLLOW THE TQ SPECS!. 26lb/ft! Less and they'll walk loose, more and you'll flex the flange and get a leak that way.

When you put everything together, use antisieze on everything, at least if you ever want it to come apart again.

As far as performance, wastegate flutter seems to just be a noise issue, but an uppipe leak can cause two problems. One, your turbo might spool slower. Two, the constant flow of high-temp gasses can score the metal, causing damage to the flanges.

-Sean

-edited for lapse in concentration...

Last edited by big_adventure; 12-02-2003 at 11:53 AM.
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Old 12-02-2003, 12:20 AM   #11
flyinwrx
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Thanks a ton guys...that seems to be all the info I need on this
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