Intake / boost fluttering?

[optmspotts]

A couple days ago, I installed the K&N Typhoon intake. First things first, LOVING the new sounds.

Noticed on the motorway in 5th and 6th gears that the boost makes a flutter sort of noise after it peaks and settles at around 1 bar.

I will be getting the car tuned at PB soon (just waiting for turbo blanket and inlet hose).

But, in the mean time, does anyone know what is causing this noise?

Evidence: (skip to 0:21 if impatient)

[video=youtube;G_vNvcdiS2Y]

[evljat]

Compressor surge. New intake probably made it more noticeable.

[optmspotts]

Is it a problem? Is there a fix? Doesn't sound like it's doing any good...

[Timmah]

 optmspotts said:

Is it a problem? Is there a fix? Doesn't sound like it's doing any good...

What BoV do you use?

I'm watching your boost gauge and I can see it peak then taper off, which is around when you hear the noise. I wonder if 1 your BoV isn't holding boost causing the issue or 2 your boost control system is not holding boost and when it tapers off you're getting surge.

Keep in mind I have no idea. I'm sure your tuner will know.

[optmspotts]

 Timmah said:

What BoV do you use?

I'm watching your boost gauge and I can see it peak then taper off, which is around when you hear the noise. I wonder if 1 your BoV isn't holding boost causing the issue or 2 your boost control system is not holding boost and when it tapers off you're getting surge.

Keep in mind I have no idea. I'm sure your tuner will know.

I use GFB Respons adjustable BOV set to about 40/60 (more recirc).

Yeah, I was trying to keep the boost gauge in focus because before filming I noticed that too.

Regarding boost control system, I have seen some posts online that suggest a 3 port boost solenoid might provide a fix but haven't really looked too much at that. You can lose yourself online with some of these car symptoms queries.

[Marky]

Simplest explanation is the turbo is trying to push more air in than the engine can swallow, it's backing up and makes that weird chuffing noise.

It's not ideal but a decent tune will take care of it, or just dropping the boost a bit at the point it starts chuffing

Some cars suffer from it a lot worse than others for what it's worth

[lachlan]

is that foot flat or partial ?

get a bigger exhaust housing =p

[Guest]

 lachlan said:

is that foot flat or partial ?

get a bigger exhaust housing =p

Def sounds/looks partial. Playing with the avcs can help with bringing on boost without surge.