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

[Skeezixzx9r]

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?

[SHOnUup]

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...

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[65fastback2+2]

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.

[rondeau13]

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

[FoMoCoSHO]

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.

[14SHOCAR]

I'm not reading this whole thread there are too many pages. I've had something similar to this.

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

Are you throwing a code? It sounds like surge. Does it sound like mine?

[John Miller]

Okay, so I just registered specifically for this thread.  Hello!

I am having the same issue with my 2015 SHO that the OP describes.  And I mean EXACTLY.  Low RPM flutter/surge on the highway as you attempt to gently increase speed up an incline.  If the car is able to gear down, the problem stops completely.  It is faint enough that the dealer obviously can't "replicate," and I'm afraid I was not surprised.

Was there ever a resolution?  Or did those here decide it was a natural characteristic of the EB?

I checked all the hoses on the top of the engine very carefully -- all are soft, pliable, and properly connected.  I also cleaned out the CAC, and I'll be putting new plugs in next week.

I am disturbed that a tune only made the matter worse, as I was hoping a tune would be the solution.  I know Torrie at Unleashed told me he could make the car downshift faster from 6th to 5th, so maybe that's the answer . . . .

[ZSHO]

Okay, so I just registered specifically for this thread.  Hello!

I am having the same issue with my 2015 SHO that the OP describes.  And I mean EXACTLY.  Low RPM flutter/surge on the highway as you attempt to gently increase speed up an incline.  If the car is able to gear down, the problem stops completely.  It is faint enough that the dealer obviously can't "replicate," and I'm afraid I was not surprised.

Was there ever a resolution?  Or did those here decide it was a natural characteristic of the EB?

I checked all the hoses on the top of the engine very carefully -- all are soft, pliable, and properly connected.  I also cleaned out the CAC, and I'll be putting new plugs in next week.

I am disturbed that a tune only made the matter worse, as I was hoping a tune would be the solution.  I know Torrie at Unleashed told me he could make the car downshift faster from 6th to 5th, so maybe that's the answer . . . .

Welcome aboard John,please follow this link and introduce yourself and we will proceed from there,thanks.  Z        http://www.ecoboostperformanceforum.com/index.php/board,14.0.html

[AJP turbo]

Its starting to sound more interesting....they way you are making it sound it sounds like a hole in a tune perhaps

Be nice if someone could capture a data log....i know in higher gears like 5th and 6th the tq converter commands less slip at lower rpms and i dont think the car likes it....i used to feel a slight bucking and quite knocking that drive me nuts....didnt see rpm surging but i wasnt looking...i added a little slip below 1500 rpm and it seems fine now

[John Miller]

I was actually leaning towards it being a trans/converter issue at one point. But the more I experience it, the less I think that.

The only thing that makes me think it's not a tune issue is the reporting by others that it is worse with the tune than with stock.

I haven't got around to buying a tuner yet, as I didn't want to start down the road of the added expense and warranty concerns with a aftermarket tune until I was sure this issue was not a mechanical problem. So, I can't datalog yet. Maybe it is in my best interest to go ahead and buy the tuner and get the data logs done, and then see what I have before I start on the road of an aftermarket tune.


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[ZSHO]

I was actually leaning towards it being a trans/converter issue at one point. But the more I experience it, the less I think that.

The only thing that makes me think it's not a tune issue is the reporting by others that it is worse with the tune than with stock.

I haven't got around to buying a tuner yet, as I didn't want to start down the road of the added expense and warranty concerns with a aftermarket tune until I was sure this issue was not a mechanical problem. So, I can't datalog yet. Maybe it is in my best interest to go ahead and buy the tuner and get the data logs done, and then see what I have before I start on the road of an aftermarket tune.


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John how many miles on your SHO? Do you have over 15k on her?  Z

[John Miller]

Yes, I have a 23,000 miles on it and counting.


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[ZSHO]

Yes, I have a 23,000 miles on it and counting.


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I would simply check to see if a strategy update is in order by your dealer.  Z

[panther427]

I have had something simular when I had both sides VTA.  But it was only up in the mountains under cruise control. I went back to 1 VTA and that seemed to help

[John Miller]

Dealer checked - no new programs and no trouble codes.

VTA?


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