What causes the turbo flutter noise?

[tom]

Anyone know what causes the turbo flutter noise? My sled seems to do it more and more lately when I get off the throttle.

 

[Travis Moore]

Anyone know what causes the turbo flutter noise? My sled seems to do it more and more lately when I get off the throttle.

In laymans terms, it's basically air 'backing up' in the turbocharger when you quickly close your throttle plates. You can get rid of this with a blow off valve.

 

[tom]

Where should the BOV go to get rid of this? My sled already has two BOVs.

 

[TurboJamie]

Still does it with a BOV.

 

[TURBLUE]

are they working.....

 

[tom]

Yea you can hear them working

 

[ripntear]

Tom it is compresser stall and it happens some times when you do not let of all the way to create enough vacuum to open the BOV all the way.

 

[sledheadgeorge]

You can try to let off some spring tension in your BOV and see if it is more responsive. I had similare situation with Turbo XS BOV. Took one washer off under the valve spring and it helped a lot.

 

[tom]

Do these BOV's require some maintenance after a few thousand miles to keep them as responsive as new?

 

[Ted Jannetty]

Still does it with a BOV.

Then the Blow off valve is too small for the application.

 

[tom]

Anybody have the Turbo Smart BOV? Wondering how many turns I should back it off to start to get rid of the flutter?

 

[Ted Jannetty]

Anybody have the Turbo Smart BOV? Wondering how many turns I should back it off to start to get rid of the flutter?

If you can back it off all the way or till it is open at Idle.