SBD turbo surge??

[shif7i7down]

That was not the first pull. But it was within the first 15mins of driving and multiple pulls

[Boofneenee]

I bet its an OFT tune. Is this a fresh tune or did you record this log hours later ?

[shif7i7down]

That was the log of when it happened

[Bach415]

When you say flutter, do you mean something like this sound? Cause that's what's coming to my head when you say flutter when you let go of gas. [ame="https://www.youtube.com/watch?v=D3djVW3dSGA"]Nissan Skyline GTR R34 Turbo Sound - YouTube[/ame].

[The Racers Line]

Originally Posted by shif7i7down

That was the log of when it happened

What your hearing is the fluttering from the headers when building boost. It is because they are slightly unequal and have flex joints on only two of the four runners. Every kit I have installed or heard has the same noise. It is absolutely nothing to worry about, and you can actually mask it very well by wrapping the headers.

[shif7i7down]

Originally Posted by Neal@EQtuning

What your hearing is the fluttering from the headers when building boost. It is because they are slightly unequal and have flex joints on only two of the four runners. Every kit I have installed or heard has the same noise. It is absolutely nothing to worry about, and you can actually mask it very well by wrapping the headers.

It's a bit different then that video, I'll have to capture it with a camera so that it'll be easier to explain. And its not happening while decelerating only during wot

[raven1231]

Originally Posted by shif7i7down

It's a bit different then that video, I'll have to capture it with a camera so that it'll be easier to explain. And its not happening while decelerating only during wot

Still could be what Neal said. You only build boost when accelerating.

[shif7i7down]

here's a video of what i'm talking about.. sounds weird

[ame]http://youtu.be/N6_MOTWKRcA[/ame]

[woode]

Are you talking about the horrible noise after you left off the gas? IE at 10 seconds? I couldn't tell if it was wind or the end of the world in your engine bay.

When you get on it, it sounds pretty normal.. the 'flutter' at full boost sounds to me like the the turbo/wastegate maintaining __ psi. It's hard to tell much though. Especially in higher gears where there is more exhaust volume trying to spool the turbo, the wastegate will work a little harder and you can hear the turbo n wastegate fluttering so to speak. I'm betting it doesn't do it in 1st gear or maybe 2nd? Mine makes the noise in 4th-6th.. sometimes in 3rd if I get on it from lower in the RPM range and its colder outside.

[shif7i7down]

it sounds like air is being released while i'm boosting, you can hear it kinda like a hissing/popping noise. it starts at around 6 sec, and it does sound like it's the wind, but it's not.. that's the noise i was talking about.. -_-. Im in the car with the windows down.

you can hear it whining up and then it slows down and speeds up again, sounds kinda like a engine trying to crank O_O..

edit: it's the sound that sounds like static

[woode]

The sound at :06 is wastegate flutter (IDK technical term, but your wastegate is trying to keep your turbo spooled at a specific amount and, especially in higher gears at higher rpm when there is more exhaust volume fighting it, thats the sound it will make)... normal. It's trying to maintain the ~7psi (whatever spring is in there). Looking at your log, you aren't losing boost that is noticeable. If you had a proper sized MAP sensor scaled then you could tell for certain, but what you are hearing is pretty typical.

I'm sure some other guys can verify.. unless there is another sound that I'm just not hearing.

Just for clarification.. the sound at like :15 is the wind buffeting, right?

[shif7i7down]

There's no wind, the window it's closed so I'm not sure that youre referring to. The chattering pulsating sound, which sounds like air is being released it's what i was talking about. It sounds Kinda like tires chirping but it's the coming front the driver side. Of i had to guess it sounds like it's coming from somewhere near the brake booster

[Mike&Ike]

He is talking about the sound you are hearing. I don't understand however why the wastegate is trying to regulate boost pressure while you are off the gas.

[ame="http://www.youtube.com/watch?v=Hs2cMA6jKSU"]Wastegate flutter??? - YouTube[/ame]

[woode]

So you're talking about the sound that starts at like :10? After you let off the gas?

Give us an exact timeframe in the video......