Unwanted turbo flutter

[Brendo0161]

Hey, 

 

I have a BA mk2 turbo and I noticed about a month ago the turbo was fluttering when I drove it hard. The car HAD just the factory diverter valve installed. So I assumed this was on the way out (being a 2004 car) and I bought an atmospheric BOV for the sound and to hopefully stop the fluttering.

The BOV is nothing special, just a $40 one off eBay that said it was compatible with my car. I put it on yesterday and no matter how I adjust the spring, under high boost, the turbo will flutter. This is the part that confuses me when I sit at 1700 revs I can hear the BOV is open no matter how stiff or soft the spring is but then I also assume it isn't opening enough when I come off the throttle, pushing air back into the turbo and making it flutter. 

 

The flutter only occurs when I floor it. Otherwise the bov will vent correctly.

 

So I was wondering;

• is the issue something like the bov not being wide enough?  
• did I jump the gun on assuming the turbo flutter was an issue? (I've heard some cars just do it)
• should I try a different spring and lubricate the piston of the bov? Or just bite the bullet and get a decent one?

 

Any help would be appreciated, cheers 

[k31th]

Which BOV did you buy?

You want a recirculating BOV if you want it to be as quiet as possible. If you like the psht sound of vent to air then that's fine too.

[Box stock T.]

Plumb it up correctly with a decent turbo smart bov and it will sound a little bit louder than a stock ford bov.

[Brendo0161]

37 minutes ago, k31th said:

Which BOV did you buy?

You want a recirculating BOV if you want it to be as quiet as possible. If you like the psht sound of vent to air then that's fine too.

 

Sorry, should have linked it:

 

https://www.ebay.com.au/itm/New-Dual-Port-Blow-Off-Valve-DIRECT-BOLT-ON-XR6-Turbo-BA-BF-FG-BOV-Dump-25mm-FPR/172620426633?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

[OZYWALKER]

The OEM valve will be the quietest one you'll find. Just make sure its plumbed correctly.