Weird "whistle" before boost

Squeakgp · 12-18-2012, 11:05 AM

So, I have been looking for another thread with a description of what I have and I can't find one. So time to post a thread and hope someone with mad search keyword powers doesn't prove me wrong.

So the situation is, I just installed the invidia catless downpipe. I have the factory midpipe and a custom muffler delete. Only other thing I have done is that I removed the intake silencer. Now, during install I did take the IC off but I have rechecked all the hoses. As far as I can tell they are on fine. The real problem with finding this sound is that I really only hear it under load. So revving it with my head under the hood doesn't get the same sound. Also the sound is most prominent pre-boost. Im not sure if the turbo/exhaust drown out the noise while in boost, but it seems to not be there.

Any ideas??

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findurpath · 12-18-2012, 11:19 AM

Are you sure it's just not the turbo spooling up? You DID remove the intake silencer...

Did you ask Bub-rub?

microsnook · 12-18-2012, 11:21 AM

Its probably normal. I have an aftermarket intake (no silencer) and it makes a whistle before I boost too. I love it! Just more noises.

Squeakgp · 12-18-2012, 11:50 AM

I'm really not sure if it shouldn't be there. I don't hate the noise, I was just worried it was bad...

eronenris · 12-18-2012, 12:32 PM

2008+ don't have intake silencers...

Squeakgp · 12-18-2012, 12:35 PM

Quote:

Originally Posted by eronenris

2008+ don't have intake silencers...

STI's do...

eronenris · 12-18-2012, 01:09 PM

Quote:

Originally Posted by Squeakgp

STI's do...

oh sorry, i misread thought you had a wrx.

RoadKillDMD · 12-18-2012, 02:25 PM

You did an intake 'silencer' delete, and now you're

why it's making whistling noises?

Sounds like you didn't do much research before diving into something that you know nothing about... Don't do that. Research THREE times BEFORE modding.

Now, to ease your mind a little, the sound is completely normal. Nothing to worry about, as long as all of your boost and vacuum lines are secure and the whistling isn't a boost leak.

Squeakgp · 12-18-2012, 02:56 PM

Quote:

Originally Posted by RoadKillDMD

You did an intake 'silencer' delete, and now you're

why it's making whistling noises?

Sounds like you didn't do much research before diving into something that you know nothing about... Don't do that. Research THREE times BEFORE modding.

Now, to ease your mind a little, the sound is completely normal. Nothing to worry about, as long as all of your boost and vacuum lines are secure and the whistling isn't a boost leak.

The silencer delete was done well before the downpipe. I am very familiar with the normal turbo spool/BPV sound associated with the delete. I like that, hence why I did the mod. This sound was in addition to what I was hearing before. I'm hitting target boost, maybe even have a bit of boost creep, and once again the sound is heard while accelerating but when staying out of boost.

Why is it that 80% of the population on here want to bash first before providing any real help??

99imprezd · 12-18-2012, 03:00 PM

Prob normal.. should be loud and whistly.. more power means more noise. lol.

n0t an sti · 12-18-2012, 07:48 PM

My car does the same thing, kind of sounds like a popped balloon rushing noise? I dont have any boost leaks but i do have an invidia catless dp and stock intake

myblusti · 12-19-2012, 09:56 AM

at what rpm are you hearing it? for example. ( when im driving in 4th and im at 2k and i punch it i hear this whistle noise about .5-1k rpm's before i feel boost.) if this sounds like your issue. this is completely normal. and you should probably downshift in this situation to prevent overboost.

Squeakgp · 12-20-2012, 11:07 AM

Quote:

Originally Posted by myblusti

at what rpm are you hearing it? for example. ( when im driving in 4th and im at 2k and i punch it i hear this whistle noise about .5-1k rpm's before i feel boost.) if this sounds like your issue. this is completely normal. and you should probably downshift in this situation to prevent overboost.

It happens in almost any gear during light acceleration, in the 1-3500 rpm range. I don't have a boost gauge, but I do have the AP, and looking at that while accelerating I stay in the negatives when I hear this noise.

99imprezd · 12-20-2012, 11:37 AM

In my 04 wrx w/ invidia catless, and perrin catless up-pipe it definitly is way louder than stock.. The sound of rushing air blowing through the dp is crazy. almost sounds like it raining really hard and a little bit of a whistle.. lol. I did have some much louder whistling that turned out to be a bad seal between the Blow off valve and my top mount intercooler whch is common for these to leak, although it didnt effect my performance at all was annoying as hell.. If you think its louder than it should be and have messed with any of the hoses to the blow off or turbo inlet, double check for leaks.. even a small one will make one hell of a ruckus..

Squeakgp · 12-20-2012, 12:14 PM

I was starting to wonder about that piece as well. Was your leak enough to feel with your hand or did you have to do something else to find it?

99imprezd · 12-20-2012, 12:34 PM

Quote:

Originally Posted by Squeakgp

I was starting to wonder about that piece as well. Was your leak enough to feel with your hand or did you have to do something else to find it?

heres a vid to how I found my leak at my BOV.. you could do the same thing without disassembly prob for individual hoses etc.. was only using about 20psi in my compressor..

http://s829.beta.photobucket.com/use...rleak.mp4.html

WRXSteye20008 · 12-20-2012, 03:30 PM

Quote:

Originally Posted by findurpath

Are you sure it's just not the turbo spooling up? You DID remove the intake silencer...

Did you ask Bub-rub?

Fantastic reference, I knew exactly what you meant when you said it. For those who don't.

OP take a video of the sound it could be a million sounds and from what you are describing sounds the the silencer delete however we have no idea. Make a video and post it so we can better help you, otherwise it could be anything. My bet it is the turbo spool you are hearing the the silencer not there as it does make it a bit louder. Everyone on here who has the silencer delete, took it out, we know what it sounds like.

Whistle Tips with Bub Rub - YouTube

Squeakgp · 12-20-2012, 04:21 PM

Oh lol, I didn't catch that reference. I have however seen that awesome video before. I will try and take a video but I have a feeling the microphone will mostly pick up my exhaust, it's kinda loud.... We will see

Bryan18 · 12-23-2012, 09:41 PM

Sounds like a boost leak...i had the same sound after a bov install. The gasket on the bov had a slight tear in it

12-18-2012, 11:05 AM	#1
Squeakgp Scooby Newbie Member#: 300394 Join Date: Nov 2011 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2012 WRX STI White	Weird "whistle" before boost So, I have been looking for another thread with a description of what I have and I can't find one. So time to post a thread and hope someone with mad search keyword powers doesn't prove me wrong. So the situation is, I just installed the invidia catless downpipe. I have the factory midpipe and a custom muffler delete. Only other thing I have done is that I removed the intake silencer. Now, during install I did take the IC off but I have rechecked all the hoses. As far as I can tell they are on fine. The real problem with finding this sound is that I really only hear it under load. So revving it with my head under the hood doesn't get the same sound. Also the sound is most prominent pre-boost. Im not sure if the turbo/exhaust drown out the noise while in boost, but it seems to not be there. Any ideas?? * Registered users of the site do not see these ads.

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12-18-2012, 11:19 AM	#2
findurpath Scooby Specialist Member#: 277487 Join Date: Mar 2011 Chapter/Region: NWIC Location: Bozeman, MT and Lakewood, WA Vehicle: 2006 CGM WRX Limited 6sp, 18G, Phatron tuned	Are you sure it's just not the turbo spooling up? You DID remove the intake silencer... Did you ask Bub-rub?

12-18-2012, 11:21 AM	#3
microsnook Scooby Newbie Member#: 313952 Join Date: Mar 2012 Location: Orlando Vehicle: 2006 STi SGM	Its probably normal. I have an aftermarket intake (no silencer) and it makes a whistle before I boost too. I love it! Just more noises.

12-18-2012, 11:50 AM	#4
Squeakgp Scooby Newbie Member#: 300394 Join Date: Nov 2011 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2012 WRX STI White	I'm really not sure if it shouldn't be there. I don't hate the noise, I was just worried it was bad...

12-18-2012, 12:32 PM	#5
eronenris Scooby Newbie Member#: 262992 Join Date: Nov 2010 Chapter/Region: NWIC Vehicle: 2009 wrx pearl white	2008+ don't have intake silencers...

12-18-2012, 02:25 PM	#8
RoadKillDMD Scooby Specialist Member#: 284792 Join Date: Jun 2011 Chapter/Region: RMIC Location: Vanilla Valley, CO Vehicle: 2011 STI Plasma Blue Pearl	You did an intake 'silencer' delete, and now you're why it's making whistling noises? Sounds like you didn't do much research before diving into something that you know nothing about... Don't do that. Research THREE times BEFORE modding. Now, to ease your mind a little, the sound is completely normal. Nothing to worry about, as long as all of your boost and vacuum lines are secure and the whistling isn't a boost leak.

12-18-2012, 03:00 PM	#10
99imprezd Scooby Specialist Member#: 198964 Join Date: Jan 2009 Chapter/Region: Tri-State Location: south NJ Vehicle: 2004 WRX wgn, built! WRB	Prob normal.. should be loud and whistly.. more power means more noise. lol.

12-18-2012, 07:48 PM	#11
n0t an sti Scooby Newbie Member#: 309488 Join Date: Feb 2012 Chapter/Region: MWSOC Location: Southern Illinois Vehicle: 2012 Impreza WRX Satin White Pearl	My car does the same thing, kind of sounds like a popped balloon rushing noise? I dont have any boost leaks but i do have an invidia catless dp and stock intake

12-19-2012, 09:56 AM	#12
myblusti Scooby Newbie Member#: 337871 Join Date: Nov 2012 Chapter/Region: South East Location: beaufort Vehicle: 2010 5-door STI blue/gold	at what rpm are you hearing it? for example. ( when im driving in 4th and im at 2k and i punch it i hear this whistle noise about .5-1k rpm's before i feel boost.) if this sounds like your issue. this is completely normal. and you should probably downshift in this situation to prevent overboost.

12-20-2012, 11:37 AM	#14
99imprezd Scooby Specialist Member#: 198964 Join Date: Jan 2009 Chapter/Region: Tri-State Location: south NJ Vehicle: 2004 WRX wgn, built! WRB	In my 04 wrx w/ invidia catless, and perrin catless up-pipe it definitly is way louder than stock.. The sound of rushing air blowing through the dp is crazy. almost sounds like it raining really hard and a little bit of a whistle.. lol. I did have some much louder whistling that turned out to be a bad seal between the Blow off valve and my top mount intercooler whch is common for these to leak, although it didnt effect my performance at all was annoying as hell.. If you think its louder than it should be and have messed with any of the hoses to the blow off or turbo inlet, double check for leaks.. even a small one will make one hell of a ruckus..

12-20-2012, 12:14 PM	#15
Squeakgp Scooby Newbie Member#: 300394 Join Date: Nov 2011 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2012 WRX STI White	I was starting to wonder about that piece as well. Was your leak enough to feel with your hand or did you have to do something else to find it?

12-20-2012, 04:21 PM	#18
Squeakgp Scooby Newbie Member#: 300394 Join Date: Nov 2011 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2012 WRX STI White	Oh lol, I didn't catch that reference. I have however seen that awesome video before. I will try and take a video but I have a feeling the microphone will mostly pick up my exhaust, it's kinda loud.... We will see

12-23-2012, 09:41 PM	#19
Bryan18 Scooby Newbie Member#: 141238 Join Date: Feb 2007 Chapter/Region: NESIC Location: Somewhere, MA Vehicle: 2006 STi Crystal Gray Metallic	Sounds like a boost leak...i had the same sound after a bov install. The gasket on the bov had a slight tear in it