turbo chatter
- Thread starter Raji_boy
- Start date
fastglanza
Member +
you get that sound wen u dont run a blow off valve or if the valve is too small/not adjusted properly...wiki compressor surge thats what it is..
By not running a BOV you are not damaging the turbo, People say it does as the sound is produced by all that built up air Pushing with force onto the turbo compressor blades but it isn't true, When you lift of the throttle the Throttle body shuts and all the air getting pushed into the engine hits the throttle body causing a shock-wave through the air going back to the turbo then the noise is produced Were the Turbo blades cut through the Air,
Like if you getting a skipping rope for instance and swing it really fast through the air you get that Swoosh sound, That is exactly what the turbo is doing just cutting through the air that is on the Compressor side of the turbo, Until the turbo slows down then you cannot hear the noise as the blades are not cutting through the air quick enough,
Going back to the skipping rope...
Swing it quickly through the air you get a Swooshing sound
Swing it slowly through the air you don't get any sound what so ever
It does not damage the turbo unless your running absolutely stupid amount of pressure, If it was so bad for the turbo Standard car's would run BOV's
Like if you getting a skipping rope for instance and swing it really fast through the air you get that Swoosh sound, That is exactly what the turbo is doing just cutting through the air that is on the Compressor side of the turbo, Until the turbo slows down then you cannot hear the noise as the blades are not cutting through the air quick enough,
Going back to the skipping rope...
Swing it quickly through the air you get a Swooshing sound
Swing it slowly through the air you don't get any sound what so ever
It does not damage the turbo unless your running absolutely stupid amount of pressure, If it was so bad for the turbo Standard car's would run BOV's
TurboDave
Member +
The compressed air forcing its way back through the turbo which is still spinning at ~120,000 rpm will put some strain on the journal bearings, but I dont think that it would significantly lower the turbos life.
Most standard cars do run bovs there are very few which dont, they are just recirculating dump valves which vent back into the intake rather than to the atmosphere.
I personally think not having a turbo timer would do more long term effects then not having a BOV but that's my opinion
I'm not going to run a BOV once a get an induction kit, and my boss has never run one on his track car which is set a 1.7 bar and he has never had any sort of Turbo problems
I'm not going to run a BOV once a get an induction kit, and my boss has never run one on his track car which is set a 1.7 bar and he has never had any sort of Turbo problems
I_<3_Boost
Member +
???
dont think you boys really know what your talking about...or maybe its me...Just type in Axy/Axi symmetric stall, that will reveal what you think your talking about when you say "compressor surge/stall"
However dont get that confused with Wastegate chatter, this is a myth!
however it has been said that you can hear a noise when an external wastegate is fluctuating when the pressure is close to the spring pressure, but thats completly unrelated and doubt youll ever hear that.
TurboDave
Member +
???
Just type in Axy/Axi symmetric stall, that will reveal what you think your talking about when you say "compressor surge/stall"
However dont get that confused with Wastegate chatter, this is a myth!
however it has been said that you can hear a noise when an external wastegate is fluctuating when the pressure is close to the spring pressure, but thats completly unrelated and doubt youll ever hear that.
That post makes very little sense.
The wastegate is also nothing to do with chatter, so dont really understand that point either?
I_<3_Boost
Member +
Oh it makes sense, axy symmetrical stall is something different to compressor surge/stall but can be sometime mis-interpruted.
The wastegate comment is because sometime you get retards that call the fluttering noise wastegate chatter, and I was just clearing it up.
fastglanza
Member +
yea it was late i mixed up the 2..i stand corrected
apart from if it does damage...its not nice in a track race at ~1.5-1.7 bar, and then pop goes a hose..
each to there own but ive seen hoses pop off, some using the best hoses with the best t-bolts
Im sure Mr Norris also runs a dog box and flat shifts his little 9 sec evo so there wouldnt be any back pressure, would there....
As far as im concerned forcing pressurised air back through a blade thats running ridiculous rpm trying to push air the opposite direction is just a bad idea. Why youd want to slow down your turbo I have no idea. I ran no bov on my car for a while and noticed a bit more lag between gears but as with all posts in this thread I have no evidence to support this. As far as damaging the turbo I dont see the pressure loading it up to point of failure. The reality is that even if it did do a small amount of damage, there are far more variables that will wear your turbo out long before this ever becomes an issue.
Just run a quite valve that works. Anything else and people think your a twat anyway.
Last edited:
TurboDave
Member +
Im sure Mr Norris also runs a dog box and flat shifts his little 9 sec evo so there wouldnt be any back pressure, would there....
As far as im concerned forcing pressurised air back through a blade thats running ridiculous rpm trying to push air the opposite direction is just a bad idea. Why youd want to slow down your turbo I have no idea. I ran no bov on my car for a while and noticed a bit more lag between gears but as with all posts in this thread I have no evidence to support this. As far as damaging the turbo I dont see the pressure loading it up to point of failure. The reality is that even if it did do a small amount of damage, there are far more variables that will wear your turbo out long before this ever becomes an issue.
Just run a quite valve that works. Anything else and people think your a twat anyway.
The reason is that not all of the compressed and charged air will escape through the turbo on gear changes as some of it will still be contained in the IC piping and IC meaning that the turbo will take less time to force compressed air back into the engine decreasing lag.