Turbo Flutter and Blow Off Valves

[God666]

Cameron,

There are many people that wear slip on shoes.... because they are too fuggin stupid to tie their own shoe laces. And as they then have a little spare time on their hands, they make uneducated comments about shiite that they know little or nothing about. BOV is not open at cruise, it is closed.

Edited 15/08/09 04:39 AM by God666

[gragraaa]

spot on, having no bov doent damage anything, but it does get noisy from the flutter believe me,

running a good bov will hopefully dump the pressure so the turbo wont stop spinning as fast from back pressure.

personally I dont think it makes much diff iether way.

[Ricardo13]

I seriously just had tears streaming down my face at that burn on Cameron....

I have spent the last ten mins going from thinking I was doing damage to feeling relived. Great thread!!! Guys- take a look at doing the ss inductions intake and filter mod. Gobble as loud as hell and all the suckky suckky whooooosh you could want!!! (onomatapia in this tread has been really cool! ;-)

Off to take a look at deleting the mid muff for even more cool noises... Thanks again for the info and the giggles....

[BarKer]

I must be one of the more uneducated ones here... as I always thought people just ran the BOV's for the sound as that gave them the impression that somehow it made them faster and better drivers, better looking, more respected by their peers and more appealing to the opposite sex...

PS, I like my slip on shoes...

[Shark]

  On 22/06/2009 at 1:11 PM, IBTZNU said:

hi guys,

I got an Fg XR6 turbo

wot is better to have installed a BOV or a Flutter?

Thanks

To install 'a flutter' .. you must first catch a pigeon

[FIERCE]

Hello there,

Just a heads up with a little info about the damage you can create with boost re direction or Flutter as you would call it

As an engineer myself, I have had many problems with people coming to me. confused as to why there turbo makes so much <chatter>/<flutter> when they change gears or back off the throttle.

after reading alot of the threads on this topic, very few seem to hit the spot. or me being blind and bypassing a thread or too lol

anyhow.

The Flutter you hear, In time can reduce turbo life by about 25%. even though the sound is nice to the ear your turbo is screaming out help me!

Your throttle Butterfly when open, and your turbo at full boost be it 5psi or 35 psi. the racing air through your butterfly at

some time has to come to a stop when of course you back off the throttle, closing the butterfly to the inlet chamber causing all this pressure to push against the butterfly ..

I have witnessed in some stages the butterfly fins bending with the force of the boost against them. no joke. just think of a banana

I have also seen compressor fins from the turbo bending like paper to the wind . now of course this is at the extreme end of the

scale in race engines .

Thus is why you have a BOV or (blow off valve) or (bye pass valve) . when backing off the accelerator at full boost the BOV will then open thus venting the build up of pressure within system causing a gush of air or (whoosh) sound increasing your turbo's life span by a good percentage and giving you more throttle responce. even though some people love the (chatter) of the restricted BOV and induction noise. most people like piece of mind there dollars will stay in there wallet.

So the main key to stop chatter/ flutter

1) Obtain a larger BOV to suit the performance of the engine (vented or plum back)

2) chatter is caused by a restricted release valve or BOV not allowing your excess BOOST to vent thus making it reverse in flow to your compressor wheel. I.e TURBO.

hope this helps any. as I know reading it from a book can make your head spin.

[Shark]

  On 19/01/2010 at 4:07 PM, RSPEC said:

Hello there,

Just a heads up with a little info about the damage you can create with boost re direction or Flutter as you would call it

As an engineer myself, I have had many problems with people coming to me. confused as to why there turbo makes so much <chatter>/<flutter> when they change gears or back off the throttle.

after reading alot of the threads on this topic, very few seem to hit the spot. or me being blind and bypassing a thread or too lol

anyhow.

The Flutter you hear, In time can reduce turbo life by about 25%. even though the sound is nice to the ear your turbo is screaming out help me!

Your throttle Butterfly when open, and your turbo at full boost be it 5psi or 35 psi. the racing air through your butterfly at

some time has to come to a stop when of course you back off the throttle, closing the butterfly to the inlet chamber causing all this pressure to push against the butterfly ..

I have witnessed in some stages the butterfly fins bending with the force of the boost against them. no joke. just think of a banana

I have also seen compressor fins from the turbo bending like paper to the wind . now of course this is at the extreme end of the

scale in race engines .

Thus is why you have a BOV or (blow off valve) or (bye pass valve) . when backing off the accelerator at full boost the BOV will then open thus venting the build up of pressure within system causing a gush of air or (whoosh) sound increasing your turbo's life span by a good percentage and giving you more throttle responce. even though some people love the (chatter) of the restricted BOV and induction noise. most people like piece of mind there dollars will stay in there wallet.

So the main key to stop chatter/ flutter

1) Obtain a larger BOV to suit the performance of the engine (vented or plum back)

2) chatter is caused by a restricted release valve or BOV not allowing your excess BOOST to vent thus making it reverse in flow to your compressor wheel. I.e TURBO.

hope this helps any. as I know reading it from a book can make your head spin.

Okay, so you're an engineer.. what does that have to do with anything?

I've seen self proclaimed 'pilots' barely have an idea about how their own aircraft works.

Your title does not mean you have the correct knowledge.

Have you worked with cars much? If so how much do you REALLY know about them?

I think it would be wise for you to read the following thread with regards to TURBO'D PERFORMANCE VEHICLES ie: the xr6turbo.

http://www.fordxr6turbo.com/forum/Turbo-Flutter-Blow-Off-Valves-t24608.html

It's stickied in the BOV section, which is where this thread is located

Flutter will not cause the turbo to fail sooner, nor decrease it's life.

The turbo will fail due to it's own wear and tear, and the boost pressure running THROUGH it long before flutter does any damage to it.

[FIERCE]

Not wanting to get to involved with this mild matter. just offering my 2 cents worth, and what I have seen on alot of high performance engines with turbo's.

if you want to split hairs the damage that turbo flutter can create yes most likley at standard performance levels would be no more than normal oil/ dirty air wear for the turbo.

flutter will only create problems when you run into the 35psi plus range.

just helping the poster out a little.

[Shark]

  On 20/01/2010 at 7:02 AM, FIERCE said:

Not wanting to get to involved with this mild matter. just offering my 2 cents worth, and what I have seen on alot of high performance engines with turbo's.

if you want to split hairs the damage that turbo flutter can create yes most likley at standard performance levels would be no more than normal oil/ dirty air wear for the turbo.

flutter will only create problems when you run into the 35psi plus range.

just helping the poster out a little.

No worries.

I do agree with that.

However I doubt anyone running that sort of boost pressure would want 'flutter' as it's sort of an aesthetic thing

Those that ARE can seem to afford a plentiful amount of new turbos as replacements anyway..

[FGXR6T-UTE]

SO whats the best/easiset way to get a turbo flutter, I have a growler cold air intake (not sure how good it is it came with the car) basically an enclosed pod filter, so if I remove my stock bov will I get flutter?