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    1. Member LVGTi2.0T's Avatar
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      09-10-2007 11:48 PM #1
      Question, is this compressor surge?

      link to video:
      http://forums.jettamkv.com/vie...t=678

      2001 Golf 2.0 GL | 2006 Jetta GLI | 2008 Passat Wagon Komfort | 2011 Jetta TDI w/ Nav | 1975 BMW 2002
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    2. Member SoNgMaN's Avatar
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      09-11-2007 12:44 AM #2
      all i hear is wind noise
      If you live in the GTA (Toronto) send me a PM to be added to the Golf R mailing List

    3. 09-11-2007 12:59 AM #3
      Thats exactly the same sound spongebobs car was making.

    4. 09-11-2007 03:19 AM #4
      yes it is but it's not concerning, everyonw with a good aftermarket intake can hear a short surge at throttle lift especially at low rpm and WOT.

    5. Member magilson's Avatar
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      09-11-2007 08:14 AM #5
      Quote, originally posted by djorkaeff_andrei »
      yes it is but it's not concerning, everyonw with a good aftermarket intake can hear a short surge at throttle lift especially at low rpm and WOT.

      Not everyone.

      champagne wishes. caviar dreams.

    6. 10-08-2007 01:35 AM #6
      ive been searching alot and cant find anything on this, can anyone explain to me what compression surge is ? one of my friends told me i might have it

    7. 10-08-2007 09:57 AM #7
      It usually will get it all the time....you cant help it. If all these people are worried about surge then they should have left there car stock..Thats the joys of owning a turbo car... no ways around the surge problem... these damn things even do it when they are brand new..Suck up the surge and keep boosting on. With 26k on my car and have had 0 turbo issues.

    8. Member rbradleymedmd's Avatar
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      10-10-2007 03:08 PM #8
      Seemed to be everyone's favorite thread...

      http://forums.vwvortex.com/zerothread?id=3336171

      Cliffnotes will be needed, but after reading the whole thing last night, I found the thread very informative and worthwhile. Just have to shift through a lot of the non-essential posts.

      Chapter 11 Dubs

      Quote Originally Posted by Joel@Eurojet
      Dazzle them with brilliance, don't baffle them with Bull****.

    9. Member
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      10-10-2007 03:36 PM #9
      Who says you can't get around it? Check the link in my sig.

    10. Member IMAN973's Avatar
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      10-10-2007 06:33 PM #10
      Yes it is compressor surge

    11. Member gtiiiiiiii's Avatar
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      10-10-2007 10:57 PM #11
      I don't mean to sound rude, but I have to wonder how much information is correct in this thread.
      The surge area is to the left of a compressor map where the compressor blades lose their ability to produce pressure, like an airplane wing when it stalls, the compressor "slips" through the air, losing boost, "grips" the air again and rebuilds that boost over and over again, making a fluttering noise and under severe surge, causing alot of trauma to the turbo bearings. In most cars I've seen/heard about it on it is normally at lower rpms and when the car is under alot of load (like flooring it in 4th gear at 2000 rpm and holding it past 3500 rpm, building up alot of boost but not really going anywhere) Here's an explanation from someone smarter then me. If you don't feel like reading it all, then it basically means the turbo is producing more boost then it can sustain at the current conditions (rpm, shaft speed, etc) and causes the built up boost to basically go backwards or at least slow possibly stop the compressor blade. In overly simplified terms, it would be like blowing up a balloon and once the air had too much pressure in it, blowing the air back into your mouth instead of inflating the balloon. Please don't take that too literally as the only point I'm trying to make is that the pressure is greater then you could sustain in the ballon. Okay, here's the little article on it:

      "What is compressor surge?

      The surge region, located on the left-hand side of the compressor map (known as the surge line), is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur. When referencing a compressor map, the surge line is the line bordering the islands on their far left side.

      Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself. Common conditions that result in compressor surge on turbocharger gasoline engines are:


      1. A compressor bypass valve is not integrated into the intake plumbing between the compressor outlet and throttle body
      2. The outlet plumbing for the bypass valve is too small or restrictive
      3. The turbo is too big for the application "
      -Courtesy of http://WWW.Midlandturbo.com/faq.php

      Our cars suffer from none of those 3 problems. Compressor surge is definitely not caused by letting off the gas either, as then the d/v would open along with the wastegate, releasing the boost. I know that our stock d/v's also let off more then enough pressure from the intake tract so that the compressor does not suddenly slow down from the compressed air hitting the closed throttle body and causing a backlash through the intake tract. It is perfectly normal for a turbo car to make noise with an aftermarket intake while letting off the gas under boost... People always freak out about it because it does sound alot different , I've read about people worrying over it on tdi vw's, 1.8t vw's, audis, srt4's, etc. It's almost never compressor surge with a stock turbo though, but I'm not trying to rule it out, just maybe broaden knowledge on it so we don't throw the term around without understanding it.
      If anyone wants to enlighten me further on it, I'm also all ears just please have credible sources. I don't claim to be an expert on it or anything.

      Edit: I also wanted to point out that boost spikes are not the same thing as compressor surge, though it doesn't mean they can't be interelated. A boost spike could potentially cause compressor surging if the spike goes into the surge area on a turbo's compressor map.
      Modified by gtiiiiiiii at 7:59 PM 10-10-2007


      Modified by gtiiiiiiii at 8:01 PM 10-10-2007

      -Drew
      2006 Lotus Elise
      2009 370z - Stillen CAI, Fast Intention CBE / LTHs, os giken LSD, Cobb AP
      1986 944 Turbo - T4 .50 trim @ 23 psi | 2006 GTI - APR K04 sold
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    12. Banner Advertiser Forge US's Avatar
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      10-11-2007 08:26 AM #12
      Everything you need to know and then some.

      http://forums.vwvortex.com/zerothread?id=3360330


    13. Member gtiiiiiiii's Avatar
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      10-11-2007 07:32 PM #13
      Quote, originally posted by Mike@ForgeMotorsport »
      Everything you need to know and then some.

      http://forums.vwvortex.com/zerothread?id=3360330


      sweet thanks

      edit: jesus that is alot to read. bookmarked


      Modified by gtiiiiiiii at 4:33 PM 10-11-2007

      -Drew
      2006 Lotus Elise
      2009 370z - Stillen CAI, Fast Intention CBE / LTHs, os giken LSD, Cobb AP
      1986 944 Turbo - T4 .50 trim @ 23 psi | 2006 GTI - APR K04 sold
      2002 A4 3.0Q

    14. 05-08-2008 10:49 PM #14
      i was told this is a good example of surge but not really sure if it is?

      http://www.youtube.com/watch?v...lated


    15. 05-09-2008 09:08 AM #15
      Quote, originally posted by DUBBBIN17 »
      i was told this is a good example of surge but not really sure if it is?

      http://www.youtube.com/watch?v...lated

      Professional Driver on a closed Course... as he is getting off a freeway and passing a guy walking down the street... lol.


    16. 05-09-2008 03:50 PM #16
      Quote, originally posted by bwzimmerman »

      Professional Driver on a closed Course... as he is getting off a freeway and passing a guy walking down the street... lol.


      lol yea about that! but thats wat it sounds like!

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