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Old 03-08-2018, 05:33 PM   #1
snidehockey
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Drives: 12 GTI
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Stage 2, Cobb Big SF intake - 2 questions

So I've finally reached my modding checkpoint for awhile...

3" Downpipe installed
Cobb Accessport and stage 2 tune
Big SF Cobb intake
Southbend stage 3 drop in clutch

as well as recent intake manifold replacement (under TSB)
and valve cleaning by dealership (the walnut spray or whatever)

Car is running strong, but I've noticed 2 things...

1. There is a very prevalent whistle / howl / beep (like the flatline sound) from under the hood at about 4 through 5k rpm WOT. Not gonna lie, it sounds kind of awesome but not sure if thats normal with this intake?

Video of sound: https://drive.google.com/open?id=1EI...x5gPPcD7MFwNe3

2. It seems to have a LITTLE surge here and there especially at around 3k rpm light to medium throttle. It's not huge but It feels like it can't decide if it should be in boost or not. (first TC car - not familiar with behavior of a turbo)

Feedback would be awesome.

Thanks

Last edited by snidehockey; 03-08-2018 at 05:55 PM.
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Old 03-08-2018, 06:12 PM   #2
SJC
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My Unitronic intake and stage 2 tune whistles way louder than that.
It’s normal for these turbo beasties
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Old 03-08-2018, 06:40 PM   #3
GroceryGTIer
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Are you talking about the turbo spooling up?
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Old 03-09-2018, 12:05 AM   #4
BudgetPhoenix
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Sounds like the typical resonance whine you get from some full length intakes. Some people have said a gfb DV+ solves it but I guess it depends on your setup.
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Old 03-09-2018, 04:52 AM   #5
smanierre
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I've got basically the same setup sans the clutch disc. I also get the surging around 3k, I think it's just the tune. I'm going to be going stratified once I get my clutch/LSD and other parts installed. If you already have the accessport there is no reason not to really.

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Old 08-14-2018, 05:47 PM   #6
theclutch
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Quote:
Originally Posted by snidehockey View Post
So I've finally reached my modding checkpoint for awhile...

3" Downpipe installed
Cobb Accessport and stage 2 tune
Big SF Cobb intake
Southbend stage 3 drop in clutch

as well as recent intake manifold replacement (under TSB)
and valve cleaning by dealership (the walnut spray or whatever)

Car is running strong, but I've noticed 2 things...

1. There is a very prevalent whistle / howl / beep (like the flatline sound) from under the hood at about 4 through 5k rpm WOT. Not gonna lie, it sounds kind of awesome but not sure if thats normal with this intake?

Video of sound: https://drive.google.com/open?id=1EI...x5gPPcD7MFwNe3

2. It seems to have a LITTLE surge here and there especially at around 3k rpm light to medium throttle. It's not huge but It feels like it can't decide if it should be in boost or not. (first TC car - not familiar with behavior of a turbo)

Feedback would be awesome.

Thanks
Did you ever fix this? That whistling would drive me absolutely nuts!
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Old 08-15-2018, 04:48 PM   #7
snidehockey
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no. I've read that it might be the bypass valve but haven't been daily driving it enough to really get too annoyed by the sound.

As for the surging, that was 100% fixed by the "air flow straightener"
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Old 09-03-2018, 09:14 PM   #8
theclutch
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Quote:
Originally Posted by snidehockey View Post
no. I've read that it might be the bypass valve but haven't been daily driving it enough to really get too annoyed by the sound.

As for the surging, that was 100% fixed by the "air flow straightener"
What "airflow straightener?" Can you send me a link?

Since I have the same COBB SF/Downpipe setup, I think I know where the stupid whistling is coming from. Note that I was Stage 1 before with NO whistles. Now I get whistles...

Were you able to insert the PVC valve plug COMPLETELY into the intake pipe? I cannot since the COBB intake pips bung is smaller than stock!!! I am only partially in and you can still see the rubber o-ring. I was racking my brain trying to figure out why it would not go in. Finally, I put a digital caliper to good use. The COBB intake pipe bung is roughly 1.5mm SMALLER than the stock pipe bung. I will be calling COBB about this as I thought their hardware was "flawless" which is why I went with them in the first place...

I'm a wee bit surprised that this stupid pipe installation gave me MORE fitment issues than the COBB downpipe installation!
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Old 09-03-2018, 09:21 PM   #9
Stock-GTI
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Air flow Straightener

http://www.treadstoneperformance.com...w+Straightener
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