[FamilyManTrackSedan]

Yes another leak thread but I'm pretty stumped.

After my charge pipe broke I installed a new OEM pipe and OEM DVs. Right after the incident, and even with the new pipe, I've been hearing a fluctuating intake sound, like a leak sound at partial throttle, particularly rolling into throttle. "Whoshhhhhh-ffffffffffffff-shhhh-fff". This coincides with bucking/surging, and power drops when the leak sound begins. There's also a whistle on the highway at constant speed.

Measures taken: I secured the new charge pipe well. When I flash back to stock from stage 1, same noise just less intense. WOT still pulls pretty hard, and no codes are ever thrown. Smoke test and vacuum test passed with no leaks. I've visually checked for leaks in all connections and tubing etc. And just for good measure I replaced the tube from the intake manifold nipple to the DV's Y connector barb. The old DV's in the old CP wiggled a lot. The new DV's have a small bit of wiggle, but not a lot.

Video: Tough to hear but the very start of throttle has a normal DCI sound, then the "fffff" kicks in for several seconds as I hold throttle there.

Log, stock map.
http://datazap.me/u/jctw769/leak-sou...ta=1-2-6-15-22

[TrollToll]

Originally Posted by FamilyManTrackSedan

Yes another leak thread but I'm pretty stumped.

After my charge pipe broke I installed a new OEM pipe and OEM DVs. Right after the incident, and even with the new pipe, I've been hearing a fluctuating intake sound, like a leak sound at partial throttle, particularly rolling into throttle. "Whoshhhhhh-ffffffffffffff-shhhh-fff". This coincides with bucking/surging, and power drops when the leak sound begins. There's also a whistle on the highway at constant speed.

Measures taken: I secured the new charge pipe well. When I flash back to stock from stage 1, same noise just less intense. WOT still pulls pretty hard, and no codes are ever thrown. Smoke test and vacuum test passed with no leaks. I've visually checked for leaks in all connections and tubing etc. And just for good measure I replaced the tube from the intake manifold nipple to the DV's Y connector barb. The old DV's in the old CP wiggled a lot. The new DV's have a small bit of wiggle, but not a lot.

Video: Tough to hear but the very start of throttle has a normal DCI sound, then the "fffff" kicks in for several seconds as I hold throttle there.

Log, stock map.
http://datazap.me/u/jctw769/leak-sou...ta=1-2-6-15-22

That log doesn't help much. Try a full throttle log through 3rd gear with boost mean and boost target checked. Does it give a 30ff code?

[FamilyManTrackSedan]

No boost leak codes ever (saw one last year on track from a frayed hose near the canisters). WOT pulls hard no problems. Tonight I flashed back to the Wedge tune and once again all symptoms/sounds are much more pronounced. I now believe it's a bad boost solenoid (or both solenoids) and the sound is the WG staying open. Or it's the WGs but again, WOT is fine and I have no rattle. This logic sound right?

[2jzn54]

it is probably the chargepipe connection. take a picture of your throttle body connection and intercooler connection. TB it is typical for people to not get the pipe all the way on (check the bottom and right sides of the connection). Possible you just goofed on the IC end as well.. While you are in there make sure the DVs are hooked up correctly and in the locked position.

[nukezero]

i have the same issue. Very high pitched whistle noise on acceleration, like a boost leak or turbo. This is after I swapped out and replaced all vacuum hoses.

Do you have wastegate rattling on de-acceleration?

[FamilyManTrackSedan]

Here's two new logs on (an awesome) wedge map which lets me hear/feel more of the symptom. I tried to include as many params as I could. Took out cyl timings cause they have been solid.

Rolling into partial throttle, sound and surge/power cutout was present:
http://datazap.me/u/jctw769/issuewed...6-8-9-12-13-22

WOT pull 2nd gear
http://datazap.me/u/jctw769/issue-we...-9-11-12-13-22

Originally Posted by nukezero

Do you have wastegate rattling on de-acceleration?

No rattle. There's a metallic rattle right when I start the car, but that's it. I always thought it was the exhaust flap which is broken, but the golf tee mod is active.

Originally Posted by Daily Three

chargepipe connection....IC end as well... DVs are hooked up...

Thanks for these suggestions. All these connections are solid. I messed with the CP for weeks, also checked IC both sides.

[FamilyManTrackSedan]

Things got more interesting - TPS actual spikes for no reason? I didn't even notice in the log above but it's doing the same thing. Couple more logs.
http://datazap.me/u/jctw769/more-lea...-3-4-5-6-11-21
http://datazap.me/u/jctw769/more-lea...&data=1-3-4-21

[dabesteva335]

I got the same problem and I have a cobb charge pipe installed , I checked all connections and seems fine and also I swapped my air intake box for cones and I am suspecting them.

[AndyW]

Look for a joint with an oil sheen (it may be on the underside of the CP to throttle body connection). If you have a boost leak, it's going to have some oil in it and should be visible. Make sure you check your TMAP connections also.

[FamilyManTrackSedan]

Here are two more logs and more new info. I invite you to describe what's happening if you truly know what you're talking about. Dazzle me.

Here is 3rd and 4th gear with normal driving. 3rd did not make the noise this time, but 4th did make the noise. When this happens, boost req well exceeds boost and load req exceeds load, and TPS spikes.
http://datazap.me/u/jctw769/leak-uph...9&solo=5-6-8-9

Now here is what looks to be the exact opposite a minute later, and the noise is present. Here boost exceeds boost req, and TPS closes:
http://datazap.me/u/jctw769/leak-uph...9&solo=3-4-8-9

More digging:
Removed a vacuum canister with a very, very tiny leak at the nipple. In fact I removed both of them.
One of my boost solenoids leaks down horribly. Both solenoids respond to voltage correctly and open up. The rear turbo wastegate actuator closes nicely from 3psi to fully about 7psi. I have new solenoids arriving tomorrow.

Question time:
My only thought is leaky solenoids allowing WGs to close erratically. But then I don't know what the noise is. If not a "physical" boost leak, what very abrupt and obvious noise am I hearing? It makes this noise on almost every single application of normal throttle. DV's shouldn't be allowed to open without definite positive pressure, right? Am I just hearing the DCI at a different actual throttle position than I'm expecting?

[FamilyManTrackSedan]

Replaced leaky solenoid, no change.

[christofis135i]

Reviving an old thread. Hopefully someone has an answer to this. I got an n55 135i with this same issue with an ER chargepipe. All connections are good, replaced O-ring, bought a new intake. Nothing fixed it.

[FamilyManTrackSedan]

Originally Posted by christofis135i

Reviving an old thread. Hopefully someone has an answer to this. I got an n55 135i with this same issue with an ER chargepipe. All connections are good, replaced O-ring, bought a new intake. Nothing fixed it.

Since you revived the thread, I should post the resolution. My problem was simply due to my tune, allowing annoying/noticeable fluctuations in ambient vs boost at certain (lower) req loads. A new map from Ken resolved it.

Yours sounds like the sound my turbos make for first minute of driving on a cold morning, but I can't offer you more than that.

[christofis135i]

Originally Posted by FamilyManTrackSedan

Since you revived the thread, I should post the resolution. My problem was simply due to my tune, allowing annoying/noticeable fluctuations in ambient vs boost at certain (lower) req loads. A new map from Ken resolved it.

Yours sounds like the sound my turbos make for first minute of driving on a cold morning, but I can't offer you more than that.

Interesting. I was told it was my diverter valve so I'm installing the DV+ today.

Also got my tablet and cables to get rid of my JB4 and run MHD. I'm hoping this will fix my issue if the DV+ does not.

[FamilyManTrackSedan]

Originally Posted by christofis135i

Interesting. I was told it was my diverter valve so I'm installing the DV+ today.

Also got my tablet and cables to get rid of my JB4 and run MHD. I'm hoping this will fix my issue if the DV+ does not.

My ER cp has been rock solid. DVs are a must anyway w/ all these applications. Maybe you've found by now, once you're on this road it's kind of "everything must go" regardless.

[christofis135i]

Originally Posted by FamilyManTrackSedan

My ER cp has been rock solid. DVs are a must anyway w/ all these applications. Maybe you've found by now, once you're on this road it's kind of "everything must go" regardless.

Just a follow up on this. Switched from jb4 to MHD. Which fixed my issue. I can see why everyone hates jb4 now. Made my car run like shit!