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

That's my video blog. I had the same issue. Its explained in the audio of the video, but essentially your car is detecting an overboost and opening the waste gates. it could be a cracked pipe, it could be the same issue with the hose, or it could be a variety of other issues. Sometimes I feel the boost, sometimes I don't. When I lay into the throttle it feels like a naturally aspirated Taurus.
 
14SHOCAR said:
That's my video blog. I had the same issue. Its explained in the audio of the video, but essentially your car is detecting an overboost and opening the waste gates. it could be a cracked pipe, it could be the same issue with the hose, or it could be a variety of other issues. Sometimes I feel the boost, sometimes I don't. When I lay into the throttle it feels like a naturally aspirated Taurus.
That is the worst feeling in the world. I experienced that when the tech forgot to tighten the clamp on my CAC.
 
FoMoCoSHO said:
That is the worst feeling in the world. I experienced that when the tech forgot to tighten the clamp on my CAC.

Between the downpipes and the tune issues, I was VERY frustrated. And I didn't even know where to start. Stock Tune had the same issues. Luckily I saw that hose came off.
 
I just read that high boost at low rpm can cause compressor surge dee to the engine not consuming enough air because of the low rpm. Just a thought. I'm hitting 22 psi at 1800rpm so this is definitely a possibility
 
Very well could be...i had this early on and i couldnt make the car like it much ...that just goes to show u that turbo lag is non existent in the ecoboost motors...22 psi at 1800rpm is pushing them hard....the tune has compressor surge pretty well defined as far as airflow so you shouldnt be exceeding that but without the tune hard to see whats really going on
 
Wired part is that there isn't really anything special about this tune other than its made for performance with the aftermarket parts that I have but other than that it's a tune that works for other ecoboost f150s
 
So I checked my vacuum hoses cleaned all sensors and still getting flutter. So I loaded my five star back on. Problem solved
 
Probably saved yourself an engine in the process!  What kind of psi are you seeing now in the low rpm range?
 
Funny you mention that, I've just been reading about some knock sensor shenanigans....

Bad thing can happen when you remove the ECMs ability to pull timing.....

 
I'd love to see that *** log.

I know he "fires customers" for sharing them with anyone besides himself and his crew but I don't get the impression that will be an issue going forward.

Red flag anyone?
 
FoMoCoSHO said:
I'd love to see that *** log.

I know he "fires customers" for sharing them with anyone besides himself and his crew but I don't get the impression that will be an issue going forward.

Red flag anyone?

Fires customers lol..how does one survive like that?....i dont think he would like me much

He doesnt like people looking at his logs lol?...no secrets in a log....thats actually an opportunity to showcase your tune and the skills tou have as a tuner
 
Whats the website?...maybe someone could use a good dose of ajp lol?...i like reading about people being all bent out of shape
 
Ok, dumb question time.  I scanned the entire thread and did not see the "he" that is referred to.  Who is the tuner in question?
 
Run from that company as fast as you can...that guy is a raving lunatic that just got booted from my drag times page. He flipped out and started attacking everyone....that's after he researched guys names on the list and personally called them on the phone offering free tunes.

Run, now, don't look back...

Sent from my SM-N920V using Tapatalk

 
my mks does it occasionally...usually when ive been cruising and slow down significantly and need to speed back up. it wont downshift and just lugs itself trying to build some boost.

does it on my 87 and 89 octane unleashed tunes.

then, i press the throttle a hair more than already what is a ton and it double downshifts and takes off. my wife hates it when shes driving because it'll jump and throw you in the seat like you are an idiot at driving.
 
So here's an update and answer to this problem with no name. ITS COMPRESSOR SURGE!!  Not good. Here's a perfect example of what my truck sounded like only difference is that it was at low rpm. But all contributing factors were there, load, high boost. Watch this video please.  https://youtu.be/nCj6Spwl1CU
So I'd like to thank my tuner for reducing the life of my turbos. Thanks
 
65fastback2+2 said:
my mks does it occasionally...usually when ive been cruising and slow down significantly and need to speed back up. it wont downshift and just lugs itself trying to build some boost.

does it on my 87 and 89 octane unleashed tunes.

then, i press the throttle a hair more than already what is a ton and it double downshifts and takes off. my wife hates it when shes driving because it'll jump and throw you in the seat like you are an idiot at driving.
This sounds similar to how both SHO's behaved tuned or untuned. It happens going up hills and the car is about 0 psi, right on the edge of vacuum/boost. It doesn't sound like rondeau's vid though, its hard to explain the sound....to me it sounds like the turbo is stalling or having trouble breathing....some kind of turbulence in the airflow. Forcing the car to downshift fixes it. When this occured KR pegged at -5 everytime.

I went for a drive the other night and the new E20 tune seems to have fixed the issue on the 2015, it's no longer doing it.

If anyone has any ideas what the sound actually is, I'd love to hear them.

 
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