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Old 03-08-2018, 05:33 PM   #1
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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:

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
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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
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Are you talking about the turbo spooling up?
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Old 03-09-2018, 12:05 AM   #4
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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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File Type: jpg dvwhistleexplanation.jpg (173.1 KB, 22 views)
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Old 03-09-2018, 04:52 AM   #5
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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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