Turbo 'flutter' during low rpm / high gear acceleration...

[FoMoCoSHO]

What format and how big is the file?

[SHOdded]

2MB limit.  Zip is ok.  Otherwise dropbox or google drive link are good options.

[rondeau13]

There we go.

[AJP turbo]

Id have to see the entire log but i wouldnt really worry about the wastegate reading...it smooths out rather quickly..in the beginning when u nail the throttle it will take time for the ecu to fine tune the wastegate duty.

But whats more concerning is ur throttle angle shows 90...it shouldnt exceed 82...max throttle angle allowed scalar has obviously been changed...at high boost pressures the risk with a 90 degree throttle angle is the rushing air wont allow it to close and the 8 degree difference does nothing to obstruct airflow so no performance gains

[rondeau13]

But that's the thing it happens when I'm not mashing the throttle to get it to behave like this. The pictures I posted show me mashing the peddle after lightly applying for a few seconds to log the flutter the because I don't want anything to explode I mash it down because at higher rpm the behaviour stops. I can lightly apply throttle and hold it there for ten seconds (that's a long time) and it will fuller the entire time.

quote author=ajpturbo link=topic=4958.msg85437#msg85437 date=1444257915]
Id have to see the entire log but i wouldnt really worry about the wastegate reading...it smooths out rather quickly..in the beginning when u nail the throttle it will take time for the ecu to fine tune the wastegate duty.

But whats more concerning is ur throttle angle shows 90...it shouldnt exceed 82...max throttle angle allowed scalar has obviously been changed...at high boost pressures the risk with a 90 degree throttle angle is the rushing air wont allow it to close and the 8 degree difference does nothing to obstruct airflow so no performance gains
[/quote]

[AJP turbo]

I only see wastegate duty cycle fluctuating right around when u nail it ...and at part throttle the wastegate duty is always all over the place

It really could be a multitude of things and without the tune its rough...if the desired tip multiplier and or desired tip adder  is turned up in an attempt to raise boost then the noise u are hearing may not be wastegate noise at all..if the desired tip is up the throttle will do what it wants to give the commanded torque and if the throttle is partially closed like at part throttle and the turbo is being told to ramp up then ive heard fluttering noises because the airflow is fighting the throttle plate

[rondeau13]

OK I received a tune revision from the tuner I will try it and see. Thanks for your input it definitely shead some light on this for me
I will report back after I try a few things

I only see wastegate duty cycle fluctuating right around when u nail it ...and at part throttle the wastegate duty is always all over the place

It really could be a multitude of things and without the tune its rough...if the desired tip multiplier and or desired tip adder  is turned up in an attempt to raise boost then the noise u are hearing may not be wastegate noise at all..if the desired tip is up the throttle will do what it wants to give the commanded torque and if the throttle is partially closed like at part throttle and the turbo is being told to ramp up then ive heard fluttering noises because the airflow is fighting the throttle plate

[rondeau13]

OK so the revised tune still makes the flutter. But it's alot tamer. Would it have anything to do with the manifold pressure being 255 kpa when the noise/stumbling starts to occur?  I noticed this on the data log. It is the same on both the original and revised tune.

[AJP turbo]

Hard to say...id like to see a full wot log if u have one...255kpa in the manifold?...nice...run it hard no mercy lol...how long do you hold that?

255kpa is 22.29 psi love it

[SHOdded]

Are you seeing oil/water accumulation in places like the intercooler, intake piping, turbo piping etc?  Checked the pipes for cracks (they can be hard to spot, particularly next to the clamps)?  Clamps nice & tight?  Check & clean the MAP sensors with MAF cleaner also.

2013, right?  The wastegates are electronically controlled, don't know how different it is from previous years in actual operation.  Here's a TurboSmart (mechanical) replacement unit with installation instructions:
http://www.stage3motorsports.com/TS-0215-1367-2013-2014-F150-EcoBoost-TurboSmart-SP-Supersonic-BOV.html
http://www.stage3motorsports.com/assets/images/Turbosmart/Install%20Instructions/TS-0215-1367%202013-2014%20F150%20EcoBoost%20TurboSmart%20SP%20Supersonic%20BOV%20Instructions.pdf
Tech + marketing blather:
http://www.turbosmartusa.com/technical-articles/flutter-compressor-surge/
F150s have bigger turbos, can handle more psi efficiently than the SHOs.

[rondeau13]

255 is 37.9 psi... Unless I missed something in the conversation. It jumps to that then slowly comes down while I'm still accelerating. Also my truck is a 2012 and the wastegate actuators seem to be controlled my manifold pressure. Is it possible that the springs inside the actuators are to week to hold that kind of boost and it's making them chatter?

I run the Afe intercooler and a Rx catch can and I've cleaned all my intake track sensor the piping and inter cooler are clean. I'm leaning toward the turbo smart wastegate actuators as my next upgrade.

255kpa is 22.29 psi love it

[FoMoCoSHO]

I think you have to subtract ambient pressure which is around 14.7?

[SHOdded]

Is it possible that the springs inside the actuators are to week to hold that kind of boost and it's making them chatter?

It's possible, but we'd need to know the specs on the OEM actuator to be sure.  TurboSmart promises much better/more even control than OEM, so it may resolve the issue for you.

Do you feel any unevenness in the power delivery when the "flutter" happens?  A wastegate issue is usually immediately noticeable.

[14SHOCAR]

zzfab / rondeau13-- did you watch this video yet? does it sound the same as this?

https://www.youtube.com/watch?v=vrhBu5XtafU

[rondeau13]

Yes there is unevenness for sure when the flutter is happening it's like I'm going in and out of boost...

Do you feel any unevenness in the power delivery when the "flutter" happens?  A wastegate issue is usually immediately noticeable.
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