turbo flutter under hard boost

[Readiee1.8t]

hi people!

in need of some more advice from you guys! ive got a 03 plate cupra R amk. I have noticed that I have a turbo flutter under high boost, sometimes it flutters under light boost but very rarely, its usually when I start giving the car a hammering, it will flutter,
The car has a Forge 008 valve, front mount intercooler, n249 bypass with 4mm IDvacuum piping and a bmc cone filter with heatshield, its usually okay up to 0.5 bar but anymore then that when driven with bit of a heavy foot it will flutter.

any ideas??

 

[ibizacupra]

flutter under boost at only a little more over 0.5bar is very unusual

flutter on spool on set on aggressive boost is possible but thats >1.2-1.5bar or more boost, and once past 4500rpm it would pass once engines consuming the air...

 

[Readiee1.8t]

Its not a full flutter, it still has the wooshh noise but has bit of a flutter to it.


Strange??

 

[Alexis27]

What colour spring is in your 008?

 

[Readiee1.8t]

To be totally honest I haven't looked but I shall do this weekend..

 

[adambudders]

Does it sound more like a stutter?
Like the air coming in is stuttering.
Not the valve fluttering.
If that makes sense? ??

 

[GlanzaV]

What colour spring is in your 008?

Check this - The stronger the spring the less it will open at lower boost pressures (it's an attempt to prevent the gauge from leaking boost at higher pressures IIRC)

Green spring = 5 - 15 PSI
Yellow = 15 - 23 PSI
Blue = 23 - PSI

Been a while since I've owned a turbo petrol car mind you...

 

[Readiee1.8t]

Does it sound more like a stutter?
Like the air coming in is stuttering.
Not the valve fluttering.
If that makes sense? ??

Yeah that would probably be best way to describe it. It does sound more of a stutter!! How comes bud?

 

[Readiee1.8t]

Should i be able to move the actuator arm freely? There is a bit of resistance there but doesnt feel alot.
Cause this cause the stutter/flutter?

Lee

 

[Clarkeez]

I'd suggest to get a new actuator. I can't move mine freely.

 

[Readiee1.8t]

Should i be able to move the actuator arm freely? There is a bit of resistance there but doesnt feel alot.
Cause this cause the stutter/flutter?

Lee

Anyone else have an opinion on this??

 

[Readiee1.8t]

Anyone else have an opinion on this??

...

 

[CJRamze]

I used to get a tiny bit of flutter if I gave if 80% throttle and then lifted off just as the turbo spooled.
I wouldn't do it intentionally but occasionally it would happen.
My LCR however was remapped with Jetex and 007P so maybe it was just the sound of the air rushing around

 

[Readiee1.8t]

I used to get a tiny bit of flutter if I gave if 80% throttle and then lifted off just as the turbo spooled.
I wouldn't do it intentionally but occasionally it would happen.
My LCR however was remapped with Jetex and 007P so maybe it was just the sound of the air rushing around

Yeah it's a strange one, I'm gonna get anew actuator and clean forge 008 valve. Just wanna sort it out lol