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Old 09-22-2012, 05:03 PM   #26
tomkun
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Im pretty sure its wastegate flutter, I had the same noise for a while. Its more pronounce when you floor it in thrid or higher gears.
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Old 09-22-2012, 07:15 PM   #27
Subiezilla
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Quote:
Originally Posted by RuinerXL
Found another video demonstrating the same sound, but much more pronounced than I'm getting.

Video Link: http://www.youtube.com/watch?v=zFHFcYpuPrk

The description indicates that the sound is the wastegate. Hmm...
Had a similar sound but was present all the time when getting close to full boost and it did not allow the car to fully build boost properly. It turned out to be what APM racing has mentioned about the TB to IC hose. Hope it helps.
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Old 09-22-2012, 11:33 PM   #28
Alank34
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Would an aftermarket tb hose solve the problem?
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Old 09-24-2012, 02:37 AM   #29
suBooneru
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Quote:
Originally Posted by limitwrx View Post
Everything I have read on this leads to the IC to TB hose clamp being loose or the hose blowing out. Its the only hose I haven't checked, but involves removing the IC to get to. I will bring it up with the dealer again on my next oil change.
It is probably that hose. I had the same noise on mine and that's what it ended up being. Rubber end cap was turned inside out, kind of damaged, and the clamp/hose was completely loose. I was able to pull it right off. Anyway I just removed the rubber endcaps, re-clamped the stock hose back on, and no problems since.
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Old 09-24-2012, 10:44 AM   #30
RuinerXL
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I will definitely be buying a Gimmick hose shortly, based on all the feedback.

This leads me to a follow up question--is there any way at all that my issues with knock at peak boost are due to a collapsed/faulty hose?
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Old 09-24-2012, 05:18 PM   #31
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Hey All,

So after I installed my cobb dp, and stage II map, I am getting this MASSIVE fluttering sound. After some reading/ research, looks like the IC to TB hose is to blame? How would this be causing wastegate flutter? Would a new map correct this?

Thanks

not trying to jack the thread..

EDIT: Its NOT the IC - TB hose

Last edited by ScoobyTed; 09-25-2012 at 05:41 PM.
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Old 09-24-2012, 06:02 PM   #32
RoadKillDMD
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Quote:
Originally Posted by ScoobyTed
Hey All,

So after I installed my cobb dp, and stage II map, I am getting this MASSIVE fluttering sound. After some reading/ research, looks like the IC to TB hose is to blame? How would this be causing wastegate flutter? Would a new map correct this?

Thanks

not trying to jack the thread..
Wastage flutter is normal. How 'MASSIVE' is this sound?
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Old 09-25-2012, 10:54 AM   #33
ScoobyTed
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OK, maybe " massive " was a bit excessive. going from a stock dp to the cobb, the noise was a bit more obvious, so I got spooked. Anything I can do, can this be tuned out?

Should I investigate the IC - TB hose?

edit: I posted to Bill from Cobb, and his suggestion was that hose. im going to pull it and run some logs. thanks guys
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Old 09-25-2012, 11:01 AM   #34
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I was going to suggest possible compressor surge (given the description), but I believe some flutter is par for the course with these cars.

So can a faulty TB to IC hose cause knock?
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Old 09-25-2012, 03:45 PM   #35
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Quote:
Originally Posted by RuinerXL View Post
Happens while on throttle only and seemingly right around peak boost, at least in my experience. Time to go with an aftermarket BPV?
yea, I tried that...... no good, still chirping.

prob your wastegate chattering. lots o people have this issue. especially with reduced back pressure and higher boost
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Old 09-25-2012, 05:40 PM   #36
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Hey Neil,

how do you cure waste gate chatter?
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Old 10-02-2012, 09:25 PM   #37
RuinerXL
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Found yet another video showcasing the exact sound I'm getting:


I have a Gimmick TB hose coming sometime this week. Really hoping the stock hose is what's causing this noise...
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Old 10-04-2012, 11:25 AM   #38
SparkSilver10NM
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Quote:
Originally Posted by APM Racing View Post


There's a coupler that gets folded under the throttle body, they get destroyed with oil, kink and leak, happened a few times with cars that we worked on from the dealerships. We work with a few local ones fixing the cars that they don't work on because taking it an actual dealer is so much more money so you start to learn those quick fixes.

You can pressure test the system and it'll sound normal, until you'll randomly touch the intercooler or bov hose, then it'll squeel like a pig, then it'll be fine.

Check it out, it's the most common issue we see with them.

The fact that your having this issue with your foot coming off the throttle (which it seemed in the first vid), would suggest the bpv hose itself has a kink or something that leaks.

The wasegate noises are much more pronounced when an aftermarket downpipe is installed, and then even more so when there are small leaks in the gaskets as with heat expansion and pressure can cause mild expansions.

-Mark

^this! mine just failed as well (throttle body side) and dealership is gonna repair. Thank god for the warranty! O and thanks to this thread because I had to suggest they look at this when they couldn't identify where the noise was coming from! Thanks all!
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Old 10-04-2012, 11:27 AM   #39
SparkSilver10NM
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Quote:
Originally Posted by RuinerXL View Post
I was going to suggest possible compressor surge (given the description), but I believe some flutter is par for the course with these cars.

So can a faulty TB to IC hose cause knock?

indirectly yes. If you leak boost at a high psi you're not giving the engine the correct amount AFR, this is bad ju ju
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Old 10-04-2012, 02:14 PM   #40
APM Tuned
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Quote:
Originally Posted by SparkSilver10NM View Post
^this! mine just failed as well (throttle body side) and dealership is gonna repair. Thank god for the warranty! O and thanks to this thread because I had to suggest they look at this when they couldn't identify where the noise was coming from! Thanks all!
yep, this is what I've heard a few times from the thank you PM's. I'm glad that this can help a few of you out, hopefully those who are still having direct issues with the whistle can get this read through a try as well.

-Mark
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Old 10-04-2012, 02:18 PM   #41
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Anything that is causing instability can cause knock as there is more than just a mechanical knock.

We just did a car with the same issue, he had a slew of parts he threw at it and tuned it himself and...well, received that whistle sound. He was surprised that this was the first thing we mentioned...so he purchased one and put it on...then came in with a Bacci 36 inch pizza and soda as a tip haha.

-Mark
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Old 10-04-2012, 03:33 PM   #42
subii_4lif
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i have the same thing
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Old 10-06-2012, 08:35 AM   #43
scapone4
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I replaced my hose with an avo hose and am still getting this sound under high boost. It is the sound from the video posted as well. Could it be bpv? Im on stock plastic one... Thanks in advance for any opinions
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Old 10-07-2012, 03:25 PM   #44
RuinerXL
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Basically, to me, it sounds like various people have thrown various parts at this sound and have gotten mixed results. I've read posts where people indicate replacing the TB hose resolved the issue (or didn't), where a new BPV fixed it (or didn't), where an improperly seated air filter or unclipped airbox was the problem (or wasn't)...so it appears potential problems indicated by this sound [and the solutions to those problems] are many.

Some seem to think the wastegate actuator could be making this sound, or even a faulty downpipe gasket. Someone suggested cracked intercooler end tanks earlier in this thread, too.

So, potential solution? Replace all the above mentioned parts...

scapone4: When you removed the stock hose, was it folded/collapsed as shown in the photo posted by APM Racing earlier in the thread?
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Old 10-07-2012, 07:40 PM   #45
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No wasnt folded. But end cap was not sitting flush on tb. I just redid the hose again with slightly different angle. Will drive tomorrow and see if its gone. All other hoses were checked and look good. If its still making noise i will get forge bpv and try that
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Old 10-07-2012, 07:44 PM   #46
garudatwo
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My experiences:
Brought the car to the dealer: tech replaced BPV, did not fix anything
Tried the forge unit: did not fix anything
Removed end caps from TB to IC hose: sound is gone.
This is a stock car (powertrain-wise) mind you.
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Old 10-12-2012, 11:49 PM   #47
RuinerXL
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So I've had the Gimmick hose for a few days and finally got some time to work on the car.

I got the intercooler off and then...couldn't get to the clamp at the throttle body. Perhaps I just couldn't see it very well, as I was working alone and didn't have anyone holding a flashlight to be able to see better, but I couldn't get the damn OEM hose off.

I did test it to see if it would slide off on its own from being loose, but no dice. Obviously, that doesn't mean it couldn't be cracked or otherwise malfunctioning. Am I retarded? Shouldn't this piece be relatively easy to remove/replace? Or is this generally a two person job?
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Old 10-12-2012, 11:56 PM   #48
garudatwo
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One person job. The clamp at the throttle body is accessed from the angle where the BPV would sit. Headlamps are invaluable, it's like a 3rd arm.
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Old 10-13-2012, 12:10 AM   #49
RuinerXL
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I was actually considering getting one of those, but thought the clamp would probably be visible without it. It was certainly easier to replace this hose on my old 9-2X Aero...

Is the clamp accessible with a regular screwdriver?
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Old 10-13-2012, 12:26 AM   #50
garudatwo
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You want a regular flat head to access that clamp bolt, one using bits is a little too thick to stick in that gap
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