Flutter sound?

[DVS33T]

I was wondering how do u get that fluttering sound? Any specific BOV's?

[Dynamix]

Apexi Dual chamber BOV.

[krawler]

I think you just set the spring tension way too hard

My laser does it like you wouldnt believe, and its got the stock turbo (VJ1), a crappy GFB atmo vent bov and a fmic. No external gate, no massive turbo, no special bov. Just hard spring tension on the atmo vent valve.

[Nozila]

im not sure about this but on my 180 i get the flutter noise up to 3k rpms but after that the bov takes over. So is the flutterring from the fmic i have?

[Skyrine-Dave]

omg this question is asked every 3rd day!!!

fluttering from the FMIC.. sif! n00bz

[Steg33]

Fluttering has everything to do with your BOV working or not. The sound is the air going back through your turbo. If you put a flat piece of tin under your BOV to block it off you will get the noise when off throttle at boost. If you adjust any BOV spring tension to tighter you'll get this sound because the BOV isn't opening at that boost level. Just means that air's going back into your turbo, not a good thing if you're running raised boost and want your turbo to last. You're better off with a pshh sound instead of the flutter.

[DVS33T]

Currently im running a HKS SSQV and the sound is quiet annoying... If i tighten this bov it will flutter?

[aybee]

im not sure about this but on my 180 i get the flutter noise up to 3k rpms but after that the bov takes over. So is the flutterring from the fmic i have?

that would be cause your not producing enough boost before 3k rpm to open the bov. so it is sent back to the turbo.

[drifto]

Anyone heard of wastegate chatter?????????????????????????????????????????????

Can one of the experts here explain why my Bro's old 31 with RB20 and no BOV had this "flutter"

Actually, don't bother cause I thinks it's been covered a thooooouuuuusand times before!

[krzysiu]

The HKS makes the POD filter flutter at low RPM's and at high RPM will Make a high picthed noise and then Flutter. Tightening it all the way will not make it just flutter.

[Steg33]

The HKS makes the POD filter flutter at low RPM's and at high RPM will Make a high picthed noise and then Flutter. Tightening it all the way will not make it just flutter.

Tightening the spring tension in your BOV 'will' produce this flutter, even more so at high boost because the BOV will be inactive if the spring is too tight and the air will resonate back in the turbo instead of being released. Any car without a BOV will give the same flutter sound as one that's got their spring too tight, eg: boosted VL's that didn't come out with BOV's.

As i've already said, if you want the sound just blank off your BOV or tighten the spring in it, but don't expect it to last a life time if it's been boosted.

[R31Nismoid]

Anyone heard of wastegate chatter?????????????????????????????????????????????

Can one of the experts here explain why my Bro's old 31 with RB20 and no BOV had this "flutter"

Actually, don't bother cause I thinks it's been covered a thooooouuuuusand times before!

ill say it again... for all those that CBF.

The flutter is caused by the air going back through the turbo.

This is due to:

1) NO BOV

2) A tightly sprung BOV, that at low PSI wont vent

3) A stuffed BOV.

4) Some ATMO BOV's do try to make the flutter, but they dont really.

The dependancy of how long/pitch etc:

1) The type of I/C

2) The size of the piping

3) The size of the turbo

- ash

[Dynamix]

Some bovs are designed to make the " FLUTTER " noise, does no one get this?