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Old 04-16-2017, 10:22 PM   #1
xrobertrushx
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Default Help me find this noise before I lose my mind, please...

Hey everyone,
I've been having this noise go on with my car for such a long time. I have linked 3 videos, showing pretty much what it sounds like (ignore the people talking). The noise seems to be dependent on exhaust flow, if that makes sense. It only happens in the high rpms, when you give it at least half throttle, but if youre at a high rev just coasting, it dosent make the noise. My theory now is the wastegate actuator may be opening a small amount or something? I tried installing the grimspeed cat back adaptor, but it only fixed some small exhaust leaks. The noise is defintely coming from the back of the car, not the front, so that seems to rule out any pre turbo gasket leaks. Mods currently done are a catback exhaust, a cobb ap, and a cobb 3 port boost controller.




Sorry this is all over the place, I'm just very irritated with this sound and want it fixed already.
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Old 04-16-2017, 10:26 PM   #2
dan86
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This noise before or after exhaust work
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Old 04-16-2017, 10:29 PM   #3
xrobertrushx
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Originally Posted by dan86 View Post
This noise before or after exhaust work
I noticed it after the exhaust was installed. It is also quieter with the silencer put in
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Old 04-16-2017, 10:30 PM   #4
Limits_of_Grip
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Are you running an external wastegate? Tuned? It sounds to me like your 3 port is opening the wastegate, like you said. Make sure you are tuned for the 3 port. If you aren't, throw your old 2 port back on and the noise will probably go away.
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Old 04-16-2017, 10:32 PM   #5
xrobertrushx
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Quote:
Originally Posted by Limits_of_Grip View Post
Are you running an external wastegate? Tuned? It sounds to me like your 3 port is opening the wastegate, like you said. Make sure you are tuned for the 3 port. If you aren't, throw your old 2 port back on and the noise will probably go away.
I always joke that I just have an EWG, but no I dont. The 3 port is the cobb version, and they make a stage 1 + 3 port and a stage 2 + 3 port tune. I'm running the stage 1 tune for it. I could put the stock one back on, but I dont have the tubing with the restrictor pill in it anymore so I would have to source that.
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Old 04-16-2017, 10:35 PM   #6
Limits_of_Grip
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Nice. I've always been ewg, so I'm not sure what the internal wg sounds like lol. I wonder if you are pushing more boost than what your wg duty cycle is tuned for. That would be my guess.
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Old 04-16-2017, 10:38 PM   #7
xrobertrushx
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Quote:
Originally Posted by Limits_of_Grip View Post
Nice. I've always been ewg, so I'm not sure what the internal wg sounds like lol. I wonder if you are pushing more boost than what your wg duty cycle is tuned for. That would be my guess.
I boost pretty normal numbers, 14-16psi depending on the day. I've also had people look over datalogs before and they said the wg duty cycle seems normal.
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Old 04-17-2017, 12:48 AM   #8
CarmelValleyWRX
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just sounds like a slight whistle. probably the ****ty ricer pipe. put stock catback and a good aftermarket downpipe on it.

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Old 04-17-2017, 01:09 AM   #9
xrobertrushx
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Originally Posted by CarmelValleyWRX View Post
just sounds like a slight whistle. probably the ****ty ricer pipe. put stock catback and a good aftermarket downpipe on it.

https://www.youtube.com/watch?v=JZD-ADArwXo
The stock catback was so absurdly quiet for me
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Old 04-17-2017, 10:22 AM   #10
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Check all your exhaust gaskets.

Same thing happens to 02-04 crvs when they get old or crack. Sounds hilarious.
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Old 04-18-2017, 12:57 AM   #11
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Check all your exhaust gaskets.

Same thing happens to 02-04 crvs when they get old or crack. Sounds hilarious.
The gasket from the stock downpipe is just replaced (bought the grimmspeed adaptor in an effort to fix it), however I have another gasket for the other flange (the axle back one? not sure the technical term). I think soon I'm going to replace that, and see if the sound goes away
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Old 04-18-2017, 09:41 AM   #12
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Quote:
Originally Posted by xrobertrushx View Post
The gasket from the stock downpipe is just replaced (bought the grimmspeed adaptor in an effort to fix it), however I have another gasket for the other flange (the axle back one? not sure the technical term). I think soon I'm going to replace that, and see if the sound goes away
Also try swapping your stock axleback exhaust back in. It may be the muffler itself.
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Old 04-18-2017, 10:32 AM   #13
andyfloyd
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Quote:
Originally Posted by xrobertrushx View Post
The gasket from the stock downpipe is just replaced (bought the grimmspeed adaptor in an effort to fix it), however I have another gasket for the other flange (the axle back one? not sure the technical term). I think soon I'm going to replace that, and see if the sound goes away
replace every gasket post turbine. If it still makes that sound it could be internal to the muffler itself.
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Old 04-18-2017, 10:20 PM   #14
xrobertrushx
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Quote:
Originally Posted by mtnmarc View Post
Also try swapping your stock axleback exhaust back in. It may be the muffler itself.
I don't have the stock exhaust anymore, so tomorrow I'm just gonna take the axleback off and drive it around dumping out the midpipe.
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Old 04-18-2017, 10:20 PM   #15
xrobertrushx
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Originally Posted by andyfloyd View Post
replace every gasket post turbine. If it still makes that sound it could be internal to the muffler itself.
I will be replacing the gasket on the axleback tomorrow, and at some point soon I plan on buying a downpipe so that will cover the other gaskets
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Old 04-23-2017, 08:57 PM   #16
xrobertrushx
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Update: It took a couple days longer then expected (cold and rainy), but today I took the muffler off and the noise was still there. Then I decided to unhook the midpipe because hey you never know, and the noise was gone. So, I'm thinking theres something wrong with the resonator in the midpipe, or the downpipe flange is ****ed. I'm leaning more toward the downpipe flange, because that thing has seriously seen better days. My next course of action is to buy a downpipe, probably an Injen catted one. I will update this post once that is all sorted out, because I hate looking up a thread and the poster never saying what fixed it.

Last edited by xrobertrushx; 05-01-2017 at 10:04 PM.
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Old 07-03-2017, 03:29 PM   #17
xrobertrushx
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Later update/bump. The downpipe flange never fully sealed with the midpipe, until recently when I finally got it to seal with an unholy creation of an exhaust leak fix using a donut gasket and the grimmspeed stock downpipe to 3inch cat back adaptor. However, the noise is still there. At this point, it's either something in the resonator making the noise, or something actually in the engine
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