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    Thread: APR Stage 1 Whistle sound?

    1. Member
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      04-08-2012 07:58 PM #26
      I don't know what you're hearing but mine sounds awesome under acceleration. A whistle when the turbo kicks in and then a loud "woosh" at 3000+. I just assume it's the vast amount of air that thing is pulling in (the engine, and the turbo). I don't think there's anything wrong with it or your car. Mine sounds like a pterodactyl.
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      04-08-2012 08:01 PM #27
      Quote Originally Posted by jsausley View Post
      I don't know what you're hearing but mine sounds awesome under acceleration. A whistle when the turbo kicks in and then a loud "woosh" at 3000+. I just assume it's the vast amount of air that thing is pulling in (the engine, and the turbo). I don't think there's anything wrong with it or your car. Mine sounds like a pterodactyl.
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      04-08-2012 10:36 PM #28
      Quote Originally Posted by jsausley View Post
      Mine sounds like a pterodactyl.
      For those that like dinosaurs and profanity...

      http://theoatmeal.com/comics/ptero

    4. Member CALICSGR's Avatar
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      04-08-2012 10:51 PM #29
      Quote Originally Posted by turbolarson View Post
      I know the exact sound you are talking about, I have the same thing with APR stage 1. It doesn't sound like the normal turbo noise I am use to but it is coming from that general area so I am thinking it might be the turbo. The noise doesn't last very long though (from about 3-4 k) and there is no fuel cut. I am glad other people are hearing the same noise though, I was getting a bit concerned that it might be just my car.
      Exactly...just a few seconds...and it's a flat whistle. It would be nice to hear APR chime in.

    5. Member GLXtc's Avatar
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      04-08-2012 10:55 PM #30
      Well this thread has turned useless......

      Thanks for the confirmation Dutch!
      Last edited by GLXtc; 04-09-2012 at 04:26 PM.

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      04-09-2012 01:40 AM #31
      Blue One

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      04-09-2012 06:31 PM #32
      It's probably just the turbo's increased airflow. I don't think there is anything to worry about.
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    8. Member GLXtc's Avatar
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      04-09-2012 06:55 PM #33
      Quote Originally Posted by Arin@APR View Post
      It's probably just the turbo's increased airflow. I don't think there is anything to worry about.
      Probably? You guys didn't experience the same sounds while testing? It definately is not the turbo. If anything it is the wastegate opening..just slightly...should this be happening? If I describe it better it is more of a sustained high pitch honk. If I get a chance I'll record it.

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      04-09-2012 07:01 PM #34
      Your car is about to explode. RUN
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    10. Member GLXtc's Avatar
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      04-09-2012 07:03 PM #35
      Quote Originally Posted by Dutchmastr9 View Post
      Your car is about to explode. RUN
      Well you WERE helpful .

    11. Member Dutchmastr9's Avatar
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      04-09-2012 07:47 PM #36
      Quote Originally Posted by GLXtc View Post
      Well you WERE helpful .
      Dude I told you what I'm pretty sure it is. Relax, there is nothing wrong with your car. No need to make a big deal about it and get your panties in a bunch. If you are really that concerned maybe you shouldn't be modding your car
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    12. Member GLXtc's Avatar
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      04-09-2012 08:36 PM #37
      Dude..are all you guys on here 12 or what... why can't I ask a question without a bunch of jacka*s comments?

      I appreciated your SEMI thoughtful response in the sea on stupidity, but then you went right along with it...why? why can't I ask a question?

      Btw...you told me what you THOUGHT it was...not what it is.
      I'll continue my conversation offline with Arin as the other unhelpful poster suggested. And here I thought I could get an answer and share it with other Vortexers. I come back to the Vortex after 10 years and this is what it is like.... depressing.

      \
      Last edited by GLXtc; 04-10-2012 at 11:49 AM.

    13. Member BRSomm's Avatar
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      04-09-2012 10:00 PM #38
      Quote Originally Posted by GLXtc View Post
      I was hoping Arin could give us some insight.
      I got my car flashed to stage1 yesterday and I now there is a whistle sound right at 3000-4000 rpm in 3rd and 4th at WOT. It sounds like a leak..or even almost mechanical in sound. or high pitched honk?
      Arin ...Could you give us some insight into what this is so we don't worry for no reason? Like reassuring us that this isn't the clutch starting to slip at peak torque?

      Anyone else hearing this and knows what I am talking about?
      Maybe someone with stage1+ can let us know if this goes away with the high flow pump installed?

      This is a 93 octane flash but this guy with 91 octane and several others in this thread have the same noise.
      Here is the other thread

      http://forums.vwvortex.com/showthrea...ht=whistle+apr
      Just did 1+ 93 octane and have the whistle sound. LOVING IT!!!!!

      It's either the turbo or a hell of a coincidence that it's happening on a pile of cars.

    14. Member GLXtc's Avatar
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      04-10-2012 09:23 AM #39
      I don't think you guys are hearing what I am hearing. It is not the turbo spooling. (the turbine jet sound). I know what a turbo sounds like.
      But this sound sounds like a valve fluttering open... very annoying and disconcerting.

      Here is a video...the shuttering whistle sound ... It is a lot louder than the video makes it out to be. I accelerate and you can hear it twice in the vid. Best heard at the beginning. Sorry for quality...did it on drive to work.



      http://youtu.be/dSiqOiRfX9U
      Last edited by GLXtc; 04-10-2012 at 02:57 PM.

    15. Member GLXtc's Avatar
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      04-10-2012 10:04 AM #40
      FYI...someone with similiar sound on a tuned GTI got this response from mike at Forge in another forum....

      They were speculating that it was the n75 valve that controls the wastegate BUT

      "Sorry guys, but it's the wastegate getting blown open that causes that particular sound.

      The N75 solenoid doesn't produce any sound, and it certainly doesn't apply any substantial level of vacuum to the actuator to actually keep it closed. When it is duty cycling, it is simply bypassing the pressure signal away from the actuator, and the 1-2 inches of vacuum from the turbo inlet is applied to the actuator instead, so the actuator is simply resting in a static position trying to keep the wastegate flapper closed against all of the exhaust gas flowing through the turbo.

      The problem is, you have a 4 PSI wastegate spring and MAYBE 1-2 inches of vacuum applied on top of that, so a total of 5-6 PSI trying to sustain 20+ PSI of exhaust gas pressure flowing through the turbo. Once the turbo spools to peak boost so quickly and the exhaust gas pressure exceeds the spring tension, it will blow it open causing a momentary relief, then the pressure builds again until it forces the flapper open again, then it builds again and bleeds again in rapid succession over and over creating the fluttering sound, commonly refered to as wastegate chatter.

      A stiffer actuator spring, achieved either by tightening the stock unit, or replacing it with a unit with a stiffer spring, is the only remedy."

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      04-10-2012 10:06 AM #41
      Wastegate flutter. I hear it all the time on mine.
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      04-10-2012 10:38 AM #42
      Quote Originally Posted by Siliconrane View Post
      Wastegate flutter. I hear it all the time on mine.
      this, what more do you want us to tell you
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      04-10-2012 10:57 AM #43
      Quote Originally Posted by GLXtc View Post
      Probably? You guys didn't experience the same sounds while testing? It definately is not the turbo. If anything it is the wastegate opening..just slightly...should this be happening? If I describe it better it is more of a sustained high pitch honk. If I get a chance I'll record it.
      Except for when the turbo is spooling, the waste gate is always open to some degree.

      I said probably because I haven't heard your sound, however I do know turbos can whistle.

      Quote Originally Posted by GLXtc View Post
      That's the turbo and that sound is normal on the Golf R.
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      04-10-2012 02:11 PM #44
      I thought that under heavy load the wastegate stays closed until it hits desired boost. If not, that would be a very easy way to reduce turbo lag, because from my understanding that is how it's supposed to work.

      From the video it just sounds like turbulant air. I think many times it's caused by the accordion style intake plumbing.
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    20. Member GLXtc's Avatar
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      04-10-2012 02:45 PM #45
      Dutch...I'm not sure what your issue is man..why are you so intent on me accepting what you said without any questions? ...I have no problem with you. If you have nothing constructive. Just stay out of it. Same goes for everyone really. Why can't we have some intellectual content with real value?..not... It's your turbo Dawg..and Stop being a pus*y..don't mod your car....etc..
      That being said...from here on out..I am just ignoring the ignorant posts.
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      Quote Originally Posted by GTIVRon View Post
      I thought that under heavy load the wastegate stays closed until it hits desired boost. If not, that would be a very easy way to reduce turbo lag, because from my understanding that is how it's supposed to work.
      Exactly... This sound seems like,once tuned, too much boost at too low RPM...(engine can't ingest) At low rpm full throttle (3700) Wastegate opens slightly to not exceed boost level(sound..high pressure air going past wastgate)...until engine RPM rises 4200rpm..engine can now ingest more air..wastegate closes...(and sound goes away.)

      OR..at low RPM/ high boost...the diverter valve is leaking..but that seems to be established that it is not a problem with new upgraded piston OEM valve.

      Seriously guys..I am not freaking out...I think the tune seems great... Just curious.. i thought we all could have an actual discussion about this. It's frustrating...
      None of my other turbo cars ever made an annoying sound like this. They all made more pronounced spooling sounds but nothing like this. I was hoping I could remedy it somehow.... (beyond some smarta*s* saying...you shouldn't chip your car)

      With all due respect Arin... I appreciate your response to my PM and here in my thread...but..your answer.."that is just what it does" is a let down... Can you contribute to an actual technical discussion about the cause? I promise not to give you a hard time.
      I know you feel like we will not know what you are talking about...But personally, I would actually like to understand..not just blindly accept it. Or even understand why I can't fix it.... whatever...just have an actual discussion.
      Last edited by GLXtc; 04-10-2012 at 03:10 PM.

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      04-10-2012 04:25 PM #46
      Quote Originally Posted by GLXtc View Post
      With all due respect Arin... I appreciate your response to my PM and here in my thread...but..your answer.."that is just what it does" is a let down... Can you contribute to an actual technical discussion about the cause?

      It's caused by turbulent airflow at boost onset. The factory K04 includes a noise muffler that's designed to lessen the sound as it's even present when completely stock, however to a lesser degree. Also, the slots in the muffer do seem to help promote a type of whistle sound in the right conditions, simliar to blowing over a coke bottle.
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      04-10-2012 04:30 PM #47
      Quote Originally Posted by GLXtc View Post
      Dutch...I'm not sure what your issue is man..why are you so intent on me accepting what you said without any questions? ...I have no problem with you. ...........
      Probably because you asked a technical question in a General forum. According to dutch, this is only the place to flame people who dislike airbags, and purely to talk about stuff like getting lowz dawgz.
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    23. Member GLXtc's Avatar
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      04-10-2012 04:55 PM #48
      Quote Originally Posted by Arin@APR View Post
      It's caused by turbulent airflow at boost onset. The factory K04 includes a noise muffler that's designed to lessen the sound as it's even present when completely stock, however to a lesser degree. Also, the slots in the muffer do seem to help promote a type of whistle sound in the right conditions, simliar to blowing over a coke bottle.

      Interesting... Thanks Arin!
      So even if I heard the wastgate functioning..(which I probably wouldn.t?)...It would not sound like this whistle?

      Also... I see you guys removed this and have a smooth section on your K04 kit for the 1.8t

      http://www.goapr.com/products/turbo_...8_tsi_k04.html

      Does this stop this from happening? Or.make it louder?

      Thanks again!

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      04-10-2012 05:19 PM #49
      Quote Originally Posted by GLXtc View Post
      Interesting... Thanks Arin!
      So even if I heard the wastgate functioning..(which I probably wouldn.t?)...It would not sound like this whistle?
      You can't hear the wastegate flapping around on the car (even if it was).

      Also... I see you guys removed this and have a smooth section on your K04 kit for the 1.8t

      http://www.goapr.com/products/turbo_...8_tsi_k04.html

      Does this stop this from happening? Or.make it louder?

      Thanks again!
      On the TSI it must be removed or the turbo will not fit. The turbo is louder.
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    25. Member GLXtc's Avatar
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      04-10-2012 05:28 PM #50
      Quote Originally Posted by Arin@APR View Post
      You can't hear the wastgatete flapping around on the car (even if it was).



      On the TSI it must be removed or the turbo will not fit. The turbo is louder.



      Ok..cool.. So it is not the wastgate.
      When you say louder..do you mean the classic turbine spool sound is louder..or the bottle whistle /squawk is louder?
      Last edited by GLXtc; 04-10-2012 at 05:31 PM.

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