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Old 09-25-2003, 10:22 AM   #1
AutoSpeedWRX
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Default Loud whistling noise after downpipe install....leak?

I installed a new downpipe and now i can hear a reall loud whistling noise coming from around the turbo. When i get on the gas it kinda sounds like "a spooling turbo". Do i have a leak, should i buy all new gaskets and do all the work over again. Help im scared.

frank
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Old 09-25-2003, 10:33 AM   #2
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You will definetly be hearing LOTS more turbo now. Probably what it is.
Are you catless?

Much more "whistle" or spool sound if that is the case.

Mine is the same way

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Old 09-25-2003, 12:50 PM   #3
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Mine did the same thing after I installed my downpipe. It's sounds great. Chances are, that's what it is. You could try putting your hand around the seal between the dp and the turbo and feel for any air.
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Old 09-25-2003, 01:55 PM   #4
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Old 09-25-2003, 02:30 PM   #5
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Default Re: Loud whistling noise after downpipe install....leak?

Quote:
Originally posted by AutoSpeedWRX
i can hear a reall loud whistling noise coming from around the turbo.
Does it sound like "WOO-WOOO!"?
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Old 09-25-2003, 04:44 PM   #6
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a good way to test for an exhaust leak is to let the car idle and walk around the car and listen from different angles. if you still hear that sound at idle you may have an exhaust leak, otherwise it is just your turbo spooling that you hear.
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Old 09-25-2003, 06:31 PM   #7
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An exhaust leak on the downpipe often sounds like a hissing, even at idle. An up-pipe leak whistles (screams) like crazy, especially under load, as the pressure gets pretty high in there. Since you hopefully didn't unbolt the turbo, it's unlikely that it is an up-pipe leak. You didn't accidentally loosen the turbo and then torque it back down, did you?

The turbo spooling whistle in my experience is made louder by intake modifications, and is most heard in like a parking garage with the windows down when the car is kind of cold. It sounds a little bit like an 18 wheeler taking off from a stoplight: a real high pitched whistle that follows the load closely, definitely a whistle that a 100,000+ rpm turbine might make. If it sounds like you or me whistling "Dixie" or something (badly), you probably have an odd downpipe exhaust leak.

When I really get on the gas the turbine whistle is usually drowned out by the air intake "whoosh," and the exhaust note, but that's just my car...

Hope this helps a little.
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Old 10-16-2003, 12:59 AM   #8
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I am not sure if it is a leak or not but I hear a whistle around 2000 RPM. When I let go of the gas pedal, it goes away and of course when I step on the gas pedal, I hear the whistle again.

Is it the turbine spinning? or leak in the uppipe? I have not checked the uppipe yet for a leak. Oh, when WOT, it sounds like I have a leak but I am not sure if it really is or just a sound of more air flowing to the pipe. I hear a surge of air--sounds heavy. Can someone diagnose this problem.

Here is my setup:

ScoobySport DP
Stock Uppipe
ScoobySport Midpipe
Scorpion Exhaust
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Old 10-16-2003, 01:29 AM   #9
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Quote:
Originally posted by 2002WRX_5speed
I am not sure if it is a leak or not but I hear a whistle around 2000 RPM. When I let go of the gas pedal, it goes away and of course when I step on the gas pedal, I hear the whistle again.

Is it the turbine spinning? or leak in the uppipe? I have not checked the uppipe yet for a leak. Oh, when WOT, it sounds like I have a leak but I am not sure if it really is or just a sound of more air flowing to the pipe. I hear a surge of air--sounds heavy. Can someone diagnose this problem.
The whistle is your turbo and is normal after doing a downpipe. You just removed a ton of "insulation" (heatshields) from the factory setup, and at least 1 cat. The noise is now amplified and unimpeded. The "leak" you think you are hearing at WOT is most likely just the wastegate flapping.
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Old 10-16-2003, 01:31 AM   #10
2002WRX_5speed
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thanks.....makes sense. Maybe a Cobb Stage 2 will fix the problem
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Old 10-16-2003, 01:32 AM   #11
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Quote:
Originally posted by 2002WRX_5speed
I am not sure if it is a leak or not but I hear a whistle around 2000 RPM. When I let go of the gas pedal, it goes away and of course when I step on the gas pedal, I hear the whistle again.

Sounds normal. Like someone said above, when you start it up one morning, just feel around the area downpipe --> turbo and see if you can feel air leaking out. But what you describe really sounds normal with a new DP.


EDIT: well my response is a little late
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Old 10-16-2003, 05:55 AM   #12
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Default Re: Re: Loud whistling noise after downpipe install....leak?

Quote:
Originally posted by djerickd
Does it sound like "WOO-WOOO!"?
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Old 10-16-2003, 10:07 AM   #13
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KInda Funny this post lasted so long. I wasnt serious, i was making fun of the fact that there is a new post like this twice a day.
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Old 10-16-2003, 10:27 AM   #14
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It sort of sounded that way...

maybe based on the fact that you got a bunch of people to respond honestly to this post you should refrain from trying to make a point in such a subtle way?

How about instead of adding to the problem of duplicate posts, you post on a thread you know that there are ansers to, and explain to the newbie how to find them?

just a thought......
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Old 10-16-2003, 01:01 PM   #15
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Quote:
Originally posted by AutoSpeedWRX
KInda Funny this post lasted so long. I wasnt serious, i was making fun of the fact that there is a new post like this twice a day.
Some of us don't spend a lot of time here, because of all the smartass elitists on this board. Boy, you really taught me a lesson
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Old 10-21-2003, 01:15 AM   #16
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I installed a bosal downpipe and vishnu uppipe last weekend. I dont knoow how to find an exhaust leak. It sounds fine to me but I would like an expert to confirm. I'm gonna go to a subaru meet soon and ask fellow suby owners around and see what they think.
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Old 10-21-2003, 02:38 AM   #17
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Quote:
Originally posted by Wade-O
Some of us don't spend a lot of time here, because of all the smartass elitists on this board. Boy, you really taught me a lesson
Remember...one smartass elitist, but 10 people genuinely trying to help! Don't go...STAY!!! WE LOVE YOU!
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Old 10-21-2003, 08:13 AM   #18
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Default Oh...

"I am afraid that the deflector shield will be quite operational!"

No, speaking from experience the COBB stage 2 cannot make mechanical noise dissapate.


The whine from the turbo will still be there, and some wastegate flutter depending on the downpipe.

Sorry

Russ
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Old 10-21-2003, 11:29 AM   #19
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I did a catless downpipe a few days ago. I had an exhaust leak from the dp/turbo flange. It could be heard at idle and you could feel it when you put your hand near the turbo. I just removed and reinstalled the dp this am and it is gone. There is still a whine/whistle when at boost, but nothing at idle and no air leaking. And yes it seems like a lot of people who have been here a while are quick to call people such as myself noobs. I say screw em
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Old 10-21-2003, 11:43 AM   #20
BYE V8
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Default Re: Re: Loud whistling noise after downpipe install....leak?

Quote:
Originally posted by djerickd
Does it sound like "WOO-WOOO!"?

nah man!! "dats only in da mornin..people should be up cookin breakfast or something by then..."

Sorry I couldn't resist
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Old 10-21-2003, 03:55 PM   #21
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"..but Bub Rubb and Lil Sis say it's all for show........"
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Old 10-22-2003, 09:36 AM   #22
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I have a scooby sport DP as well, hooked up to a Prodrive Midpipe. I know for certain I have a leak at the DP/Midpipe Flanges because I took out the gasket to replace it and I could see where the gasses were escaping because of the soot. I really have no clue on how to solve this, I even tried gasket sealant, which worked for about 30 min, then the leak came back. Mine sounded more like a fluttering noise once I got past 00 mpa and started building boost.
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Old 10-23-2003, 03:04 PM   #23
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I have a ScoobySport uppipe and am having the leak there between my exhaust manifold and my header or between my exhaust manifold and uppipe. I took it to my local Subie dealer today to have someone look at it and he suggested I crank down on all my gaskets to ensure a nice tight seal.

I am wondering if my SubyDude gaskets will be ruined and need replacement now. Any ideas on how to determine if I need new gaskets?
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Old 11-01-2008, 09:20 PM   #24
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Quote:
Originally Posted by Wade-O View Post
The whistle is your turbo and is normal after doing a downpipe. You just removed a ton of "insulation" (heatshields) from the factory setup, and at least 1 cat. The noise is now amplified and unimpeded. The "leak" you think you are hearing at WOT is most likely just the wastegate flapping.
hi sir im new to this site i was reading tjis and i had a hks downpipe installed a few days ago and i hear same sound like a whistle ir flutter wen im on 2000 rpm is this really normal im just curios but on idle i dont hear that sound thanks for d good advices
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Old 11-01-2008, 09:22 PM   #25
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a flutter sound during 2000 rpm n coming from my turbo how do i know if i have turbo to downpipe leaks
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