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Old 03-08-2018, 05:33 PM   #1
Passed Driver's Ed
Drives: 12 GTI
Join Date: Jul 2017
Location: Orlando, Fl
Posts: 10
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:

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.


Last edited by snidehockey; 03-08-2018 at 05:55 PM.
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Old 03-08-2018, 06:12 PM   #2
Drag Racing Champion
Drives: 2011 GTI
Join Date: Feb 2017
Location: Ontario
Posts: 68
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
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Drives: 2013 black Wolfsburg
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Location: Tri-state
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Are you talking about the turbo spooling up?
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Old 03-09-2018, 12:05 AM   #4
FIA World Rally Car Champion
Drives: 09 GLI
Join Date: Jul 2016
Location: Bay Area
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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.
Attached Images
File Type: jpg dvwhistleexplanation.jpg (173.1 KB, 16 views)
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Old 03-09-2018, 04:52 AM   #5
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Drives: MK6 GTI 6-SPD Shadow Blue
Join Date: Sep 2017
Location: CT
Posts: 145
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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