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

[wasinger3000]

I am almost certain a tuner can make you a custom tune that will allow for an earlier downshift. Adjusting the throttle angle vs the peddle angle would help as well. It would take a lot of communication with the person making the tune but I think you could get a nice tune tailored to your needs and be happy with it.

If there is nothing mechanically wrong with the truck as of now. I know my 13 did the same thing yours is when I was in Colorado. I'll find out what the 15 does there this weekend.

[AJP turbo]

Ok...yeah looking at atp site I see the stock sho turbo has a 49mm compressor wheel....different but not vastly different

It would seem strange for ford to use completely different turbos on an engine with the same displacement and compression and configuration

[ZSHO]

I believe the F-150 has a 51mm OD . Heres a very cool article to enjoy for all of us. Z    http://www.full-race.com/articles/inside-the-ecoboost-f-150.html

[AJP turbo]

I believe the F-150 has a 51mm OD . Z

Correct...but that's not that big of a difference...but there is more to it than that I know..I just changed turbos on my civic went from a 61mm comp wheel to a 58mm...slightly noticeable

[14SHOCAR]

Back to the OP guys -- I still vote boost leak. Are you getting an overboost condition? I explain it pretty well here:

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

There is a vacuum line that falls off on the ecoboost engines, and can be causing this flutter. Does it sound similar to what I have in here?

Do you hear the wastegate opening and staying open? Listen closely when you accelerate to hear the mechanics of the waste gates.

[wasinger3000]

I believe the F-150 has a 51mm OD . Z

Correct...but that's not that big of a difference...but there is more to it than that I know..I just changed turbos on my civic went from a 61mm comp wheel to a 58mm...slightly noticeable

The f150 3.5 is quite different than the sho 3.5. They used forged internals, different cams/heads, fuel injectors (I think) and HPFP.

[AJP turbo]

Wouldn't say QUITE a bit different.....May have some different components  but it's a 3.5 ecoboost.....Way more similarities than not...More accurate to say for all intents and purposes that the engine is the same than to say they are vastly or quite a bit different....Not like one is boosted and one is not or that the one has different bore and stroke or compression.

[wasinger3000]

Wouldn't say QUITE a bit different.....May have some different components  but it's a 3.5 ecoboost.....Way more similarities than not...More accurate to say for all intents and purposes that the engine is the same than to say they are vastly or quite a bit different....Not like one is boosted and one is not or that the one has different bore and stroke or compression.

OR... you are looking at it in to large of a scope. It's like saying a green banana and a yellow banana are the same inside when in fact they are not. :P

[BiGMaC]

Interesting that the F150 gets forged piston rods.... Thought they were all just cast from those metal beads ford uses.

[r1crusher]

The blocks are physically different castings to boot (obviously).  But I would agree with wasinger's that they are "different".  There's more major component differences than shared...i.e. pistons, rods, heads, cams, etc.  Dimensionally some of those components might be identical but their physical make up are not the same.

The F150's 3.5 is designed to handle more torque and loads, hence the major forged component.  The SHO's 3.5 is was not designed the same and I personally would have loved to seen those same forged internals in the SHO 3.5.

Not knocking anyone or their opinions here, just my observations.

So...back on the topic again...   I still believe the engine is behaving "normally" and there is possibly some minor hole in the tuning (i.e. fuel/timing/etc. tables) where under these unique circumstances it's seen.

[rondeau13]

I am having the exact exact exact problem on my 2012 f150 ecoboost have you guys found the fix yet?! I joined this forum just for this thread.

[FoMoCoSHO]

I am having the exact exact exact problem on my 2012 f150 ecoboost have you guys found the fix yet?! I joined this forum just for this thread.

No, honestly I forgot about it.

I will try to remember to log mine and post up the results.

[rondeau13]

I can log mine as well and post the results. If I remember correctly my waste gate duty cycle while the flutter happens is a fairly jagged line on the graph. So I don't know if it's a mechanical problem or a tinning problem. I had a 5 star towing tune and I could get the flutter to happen but the boost was lower on that tune and now with this performance *** tune which is totally crazy and awesome I can get the flutter going and it's very apparent. The boost also comes on at lower rpm and higher psi with the *** tune. I know some guys on other forms/threads talking about a ripped diaphragm in the waste gate. I'm leaning toward the waste gate solenoid not being strong enough to hold the boost therefore it flutters. But would it make sense that the log would pick this up if it ecu wasn't telling it to do that?

[rondeau13]

The issue is the wastegate opening and closing aggressively. Here's the proof. Now what's causing it I don't know. Maybe a weak wastegate spring? Or what ever sensor that controls the wastegate solenoid is maybe bad? I talked to my Turner, he says it's a truck issue not a tune issues. And that makes sense because the issue is happening with multiple tunes.

[rondeau13]

Won't let me post an attachment...