[Mk2] [Turbo] Turbo Flutter - with video

[killerferret666]

So ive installed a rev2 forged build with a rev3 conversion running a CT20b. I have a BOV installed which is an aftermarket one to atmosphere.

Ive noticed at lower boost / part throttle I get turbo flutter and then at WOT or high boost the BOV does sound.

The below video demonstrates. Is this anything for me to worry about or anything I need to look at. Obviously it sounds cool but apart from that is it an issue?

https://www.youtube.com/watch?v=LmlFtUYPm2U

[SonicSW20]

I don't think it's a problem.

[killerferret666]

Ok cool. Ill see how it behaves generally.

[androo007]

Have you got an arc airbox or similar? Made my flutter sound louder. It's not a problem

I run with no bov too

[killerferret666]

Have you got an arc airbox or similar? Made my flutter sound louder. It's not a problem

I run with no bov too

No but before I had the S bend with AFM of course.

Now I have a 400mm straight metal pipe to the filter which is right next to the air intake in the bodywork. I did wonder if this would make a difference!

It is a loud flutter. at 0.2 / 0.3 bar i swear it peaks. I did notice a slight flutter before the BOV went off today as well.

Just a lovely new noise then!

[raptor95GTS]

daft question. Have you re-plumbed the black and white VTA valve at the BOV? The side marked B should be on the passenger side. I had mine the other way round and it make that same noise (rev3 rhd)

[SonicSW20]

daft question. Have you re-plumbed the black and white VTA valve at the BOV? The side marked B should be on the passenger side. I had mine the other way round and it make that same noise (rev3 rhd)

Is that retained for an aftermarket BOV like the OP has? I'm sure most aftermarket ones I've seen don't use the VTA?

[raptor95GTS]

daft question. Have you re-plumbed the black and white VTA valve at the BOV? The side marked B should be on the passenger side. I had mine the other way round and it make that same noise (rev3 rhd)

Is that retained for an aftermarket BOV like the OP has? I'm sure most aftermarket ones I've seen don't use the VTA?

some do and some dont, I dont know what the OP has fitted but the noise is what I had. Like I say, could be a daft question on my part

[killerferret666]

The Bov was on my rev 2 originally and plumbed same way with only the one feed to it.

It is weird it now does it though. Boost between gear changes is it a bit slower to build back up I think as well.

[androo007]

Yeah it's not enough to make the bov pssssshhht so it flutters. Completely normal. I had an HKS that was soft and it hissed every gear change. Nowhere near as cool.