[Mk2] [Turbo] Turbo Flutter - with video

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killerferret666
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[Mk2] [Turbo] Turbo Flutter - with video

Post by 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
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SonicSW20
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by SonicSW20 »

I don't think it's a problem.
killerferret666
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by killerferret666 »

Ok cool. Ill see how it behaves generally.
My Blog on Miami GT4 kit car build using MR2 Donor Car

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androo007
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by androo007 »

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

I run with no bov too :mrgreen:
killerferret666
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by killerferret666 »

androo007 wrote:Have you got an arc airbox or similar? Made my flutter sound louder. It's not a problem :thumleft:

I run with no bov too :mrgreen:


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!
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raptor95GTS
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by 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
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by SonicSW20 »

raptor95GTS wrote: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
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by raptor95GTS »

Gazza_DJ wrote:
raptor95GTS wrote: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
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by 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.
My Blog on Miami GT4 kit car build using MR2 Donor Car

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androo007
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Re: [Mk2] [Turbo] Turbo Flutter - with video

Post by 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.
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