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Old 06-11-2010, 04:12 PM   #1
generalganja
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Default Screaming sound after tune?

I installed a catless downpipe and got tuned. Additional mods include K&N short ram intake and airpump delete. I noticed the sound when at full boost when it was on the dyno, as well as when doing data logs right after the tune. The tuner said it should be nothing to worry about. The only thing that questions me is that others who are running stage 2 on a stock TD04 doesn't have that screaming sound when at full boost. I'm thinking it might just be the result of running a short ram intake along with the increased boost. Any thoughts?


Update: Just took a quick video of it with my girlfriend in the passenger side
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Last edited by generalganja; 06-11-2010 at 05:30 PM.
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Old 06-11-2010, 04:22 PM   #2
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Quote:
Originally Posted by liberalswine View Post
I installed a catless downpipe and got tuned. Additional mods include K&N short ram intake and airpump delete. I noticed the sound when at full boost when it was on the dyno, as well as when doing data logs right after the tune. The tuner said it should be nothing to worry about. The only thing that questions me is that others who are running stage 2 on a stock TD04 doesn't have that screaming sound when at full boost. I'm thinking it might just be the result of running a short ram intake along with the increased boost. Any thoughts?
Sound clip / video?
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Old 06-11-2010, 04:25 PM   #3
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Well, I have this dyno video, but the sound is not apparent from the rear- only when in the car. I'll get another vid up from the passenger pov
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Old 06-11-2010, 04:29 PM   #4
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Pre-turbo exhaust leak, or one of the gaskets between the cast pipes and the intercooler core.
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Old 06-11-2010, 04:29 PM   #5
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If you can't get a video could you describe the noise a little more? What kind of screaming noise does it make? Does it sound like an exhaust leak?


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Old 06-11-2010, 04:43 PM   #6
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What you're describing sounds like what happened to me after putting my throttle body back on after porting it. It was a vacuum leak that sounded like a banshee scream.
I'd check around your air pump delete, make sure everything is tightened down right.
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Old 06-11-2010, 05:11 PM   #7
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If you can't get a video could you describe the noise a little more? What kind of screaming noise does it make? Does it sound like an exhaust leak?


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Originally Posted by OUScooby View Post
What you're describing sounds like what happened to me after putting my throttle body back on after porting it. It was a vacuum leak that sounded like a banshee scream.
I'd check around your air pump delete, make sure everything is tightened down right.
Sounds pretty similar to a banshee scream. From what I've been reading, people have been reporting the same sound from the result of the intake sucking up more air at high boost. I've checked all hoses, and the intake manifold from when we loosened it up to do the air pump deletes, and even checked the delete plates. Everything is snug and tight. I remember questioning the sound when the tuner was in the car and he agreed it sounded strange, but he wasn't getting any abnormal readings from the data logs.

The sound is pretty much relative to the wheezy turbo spool up sound and when it hits full boost, it turns into a screaming banshee. That's as well as I can put it for now until I get a video up
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Old 06-11-2010, 05:17 PM   #8
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Are you sure that's not YOU screaming because you're giddy like a schoolgirl?
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Old 06-11-2010, 05:25 PM   #9
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Are you sure that's not YOU screaming because you're giddy like a schoolgirl?
I deducted that conclusion after the first 3 days. Haha

However, I still do grin uncontrollably
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Old 06-11-2010, 05:28 PM   #10
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However, I still do grin uncontrollably

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Old 06-11-2010, 05:29 PM   #11
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Okay, got a video up. That's my girlfriend giggling, not me.

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Old 06-11-2010, 05:36 PM   #12
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You have a cute giggle. I hear a leak. Have you messed with the uppipe at all?


That sounds like a pressure-type of leak, not so much one post-turbo. I would think pre-turbo if you've ever messed with the uppipe, or possible leak at an IC connection.

Make sure your throttle body coupler on the bottom isn't folded up and in, it's a fairly common rookie mistake when re-installing the TMIC, especially an aftermarket one.
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Old 06-11-2010, 05:44 PM   #13
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You have a cute giggle. I hear a leak. Have you messed with the uppipe at all?


That sounds like a pressure-type of leak, not so much one post-turbo. I would think pre-turbo if you've ever messed with the uppipe, or possible leak at an IC connection.

Make sure your throttle body coupler on the bottom isn't folded up and in, it's a fairly common rookie mistake when re-installing the TMIC, especially an aftermarket one.
We removed the up-pipe but didn't seem like there were any complications when reinstalling it after doing the delete. I'll recheck the IC connection, but everything seems fine there as well.

I have concerns about my tune if there is a leak. My car was tuned in this state, if I was to fix the leak (assuming there is one), will that throw off my tune? I feel uneasy knowing I might have to pay for another retune. Ack
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Old 06-11-2010, 05:56 PM   #14
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Sounds about like mine sounds like after I installed my AEM short ram.
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Old 06-11-2010, 05:56 PM   #15
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Thats the intake. You'll be over the sound in about a week if I had to make an educated guess.
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Old 06-11-2010, 05:59 PM   #16
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Quote:
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Sounds about like mine sounds like after I installed my AEM short ram.
Quote:
Originally Posted by Badler View Post
Thats the intake. You'll be over the sound in about a week if I had to make an educated guess.
So you think it might be the intake as well? That was my guess, but now I'm starting to think it might be a leak. However, when it was getting tuned, would a leak show up in the logs?
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Old 06-11-2010, 06:51 PM   #17
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Thats the intake. You'll be over the sound in about a week if I had to make an educated guess.

That sounds like NO intake I've ever heard.



Misser Swine, I'm willing to bet that you have an uppipe leak, either at the manifold or at the turbo. In what order did you bolt everything back together?

Did you replace the uppipe gaskets? If so, what did you replace them with?


Also, does anything change with temperature? For example, when the car is barely warm, does it do it MORE than when you've been driving for a while, or no difference?
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Old 06-11-2010, 06:55 PM   #18
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That sounds like NO intake I've ever heard.



Misser Swine, I'm willing to bet that you have an uppipe leak, either at the manifold or at the turbo. In what order did you bolt everything back together?

Did you replace the uppipe gaskets? If so, what did you replace them with?


Also, does anything change with temperature? For example, when the car is barely warm, does it do it MORE than when you've been driving for a while, or no difference?
Well Mike from Subietech did the up pipe, and he reused the gaskets. I just spoke to him and remembers doing everything correctly since he has done it many times.

As for temperature, it will always be constant.

There has been reports of an intake causing this type of sound from the research I've been doing. But I'll never know until I get a chance to double check the up pipe.

Furthermore, would this have shown in the data results during the tune? And will fixing a potential leak "ruin" my tune?
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Old 06-11-2010, 07:02 PM   #19
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I've never heard a change in sound that drastic RIGHT at peak boost from any intake on the face of the planet. It's a pipe and a filter, it's not going to magically go from normal to screaming right at peak boost or at high boost.

The sound I'm hearing is a pre-turbo leak. Re-using gaskets is ok a lot of times, but the uppipe/manifold is a common place for the leak.

Why the hell did he remove the uppipe, or even un-bolt it, to do a downpipe install? That makes no sense to me....



As for the tune, it won't 'ruin' it by any means but might make a small difference. Nothing I'd be overly concerned about in terms of PROBLEMS.

Check for any soot outside the gasket.

The easiest place to check is the passenger side of the uppipe where it meets the turbo. You should be able to look down through the engine compartment and see just a small bit of it showing. It's not too likely that the leak is there, but it's where I'd start because all you need is a flashlight, no climbing under the car.
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Old 06-11-2010, 07:27 PM   #20
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Well the up pipe was removed to provide more space when removing the airpump hardline that runs across the block and intake manifold. It was such a pita to remove. As far as I see, there is no soot what so ever. Y pipe clamp, tmic coupler is on tight along with relative components. I'll have to get under and check everything with the up pipe, but mike assures that everything should be ok in that area.
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Old 06-11-2010, 07:35 PM   #21
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What psi does the sound start to happen? For instance I can add moderate throttle up to about 7psi before the sound is audible. I know for a fact that the similar sound I have is caused by the intake....if I could just find my stock airbox I'd probably put it back on...but for some reason I cant find it.
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Old 06-11-2010, 07:39 PM   #22
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Quote:
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Sounds pretty similar to a banshee scream.
I'm sure you've heard a ton of those.
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Old 06-11-2010, 07:45 PM   #23
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I'm not discounting Audio's diagnosis of an up-pipe leak.

When I installed my catless DP the intake noise and turbo spool became a hundred times more noticeable. I have a stock WRX and a WRX with a full catless TBE... the difference in "banshee" noise is very large.

However, it varies a lot more with throttle than what I'm hearing in the video...
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Old 06-11-2010, 08:03 PM   #24
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I don't have a boost gauge yet, but it occurs at wot when boost kicks in around 3.4k. It occurs slightly before peak boost and will sustain as long as it's in high peak range. As I let off enough it will go away
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Old 06-11-2010, 08:18 PM   #25
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I'm not discounting Audio's diagnosis of an up-pipe leak.

When I installed my catless DP the intake noise and turbo spool became a hundred times more noticeable. I have a stock WRX and a WRX with a full catless TBE... the difference in "banshee" noise is very large.

However, it varies a lot more with throttle than what I'm hearing in the video...

Yes, the turbo will be significantly louder with a TBE and especially an intake. However, it doesn't magically change LIKE THAT at higher boost. Sure, it changes a bit, but not that drastically. Not even close.
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