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    Thread: 1.8 turbo low boost :(

    1. 10-26-2011 10:20 AM #1
      Hello everyone.
      I have Seat Ibiza year 2000. 1.8t, k03, remapped, fmic, decat, angle block spacer for 2nd lamda.
      My car used to have a peak boost of aroud 1.4 bar on 3000 rpm, then drops to 0.7 at redline.
      For the pas year it only reaches 0.8,0.9 bar and drops to 0.5 at redline.
      Car feels slow and it is, lost 3 secs from 0-160 km/h.
      There is no boost leaks from turbo to throttle body.
      Tried different n75, still the same.
      Tried unpluging MAF (wich is 2 years old)..still the same.
      On vag com is noticable that requested boost is higher than actual boost.
      Spark plugs are dark brown, exhaust is black, pops more often than before, have 1 lamda code on vagcom.
      Can lamda cause this kind of low boost problem? Especcialy if it is narrowband...
      Any helo would be highly appreciated.

    2. 10-26-2011 10:36 AM #2
      Here is a picture od my sparkplugs...does that look rich?



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      10-26-2011 03:15 PM #3
      Do a boost leak test first before changing any parts.

    4. Member Minho78's Avatar
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      10-26-2011 03:34 PM #4
      Bad wastegate or Bypass valve are the two major causes for no boost.

    5. Member 972SLOW's Avatar
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      10-26-2011 04:35 PM #5
      Make sure bolts are tight for the turbo to manifold and turbo to dp. My mani bolt backed itself out and created a very similar issue
      Quote Originally Posted by Chaoz View Post
      Psh speak for yourself whips and blacks are no longer friends.. **** whipped creme even makes me quiver

    6. 10-26-2011 05:08 PM #6
      Thanx for the answers.
      As mentioned above..there is no boost leak, i already tested it.
      I put new k03 in hoping it will solve my problem...but it didnt..so, turbo and wastegate are in very good condition.
      What is bypass valve? Is that DV valve? If so, ive already tried another DV...the same..i also tested mine and it is not leaking boost.
      I forgot to mention that n249 is bypassed.

    7. Member codergfx's Avatar
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      10-26-2011 05:12 PM #7
      Quote Originally Posted by Strah View Post
      Thanx for the answers.
      As mentioned above..there is no boost leak, i already tested it.
      I put new k03 in hoping it will solve my problem...but it didnt..so, turbo and wastegate are in very good condition.
      What is bypass valve? Is that DV valve? If so, ive already tried another DV...the same..i also tested mine and it is not leaking boost.
      I forgot to mention that n249 is bypassed.
      Do seafoam to find exhaust leaks u might have pre turbo.
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    8. 10-27-2011 05:59 AM #8
      Ive put new turbo in 2 weeks ago, checked exhaust manifold, there was a little crack, but nothing major...i am pretty sure that there is no leaks pre turbo cuz ive tighten everything , changed all seals.

    9. Member codergfx's Avatar
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      10-27-2011 10:34 AM #9
      Quote Originally Posted by Strah View Post
      Ive put new turbo in 2 weeks ago, checked exhaust manifold, there was a little crack, but nothing major...i am pretty sure that there is no leaks pre turbo cuz ive tighten everything , changed all seals.
      The little crack can be leaking enough air for u not to boost full
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    10. Member 972SLOW's Avatar
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      10-27-2011 11:07 AM #10
      Quote Originally Posted by codergfx View Post
      The little crack can be leaking enough air for u not to boost full
      indeed this is most likely the issue
      Quote Originally Posted by Chaoz View Post
      Psh speak for yourself whips and blacks are no longer friends.. **** whipped creme even makes me quiver

    11. 10-27-2011 01:19 PM #11
      Ok then...just to confirm...
      This is not mine exhast manifold, just a pic from the net...
      I hve a crack here where there is a red circle.
      It looks like it is only a surface crack...do u really think that this could be it?!
      To loose so much exhaust gasses thru such a little crack?


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    12. Member MÄDDNESSS's Avatar
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      10-27-2011 01:40 PM #12
      if you had an exhaust leak there, you would know it. it would be noticeably loud.
      but do a sea foam.
      if there is a leak there, you will know immediately.
      I have HEX-CAN VAGCOM. PM me if you want me to come out to you.
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    13. 10-27-2011 02:49 PM #13
      hmmm...now that u mentioned it...i noticed that car is louder than before, especially in the moment when i let go my throttle...ok, ill try to find that "seafoam"..hope we have it here in croatia...

    14. Member MÄDDNESSS's Avatar
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      10-27-2011 03:33 PM #14
      when you let go?
      it should be louder when you get on it.
      I have HEX-CAN VAGCOM. PM me if you want me to come out to you.
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      Quote Originally Posted by 87vr6 View Post
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    15. Member codergfx's Avatar
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      10-27-2011 04:15 PM #15
      Quote Originally Posted by MÄDDNESSS View Post
      when you let go?
      it should be louder when you get on it.
      +1 it'll sound more like a ticking/clicking noise when the leak is pre turbo.
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    16. 10-27-2011 08:11 PM #16
      I noticed that my boost gauge is making quiet ticking sound...frequency like 5-10 times per second...
      Let me try to explain the sound when i let go of throttle...
      It used to be whooosh (DV), and only woosh, ntohing else...
      Now there s woosh but not as loud cuz i cannnot reach peak boost, and there is sound coming from the...uhm....engine...like WOOoooo...very hard to explain...
      Never the less...i know i have a crack in exhaust manni so ill try to work something out with that.
      Thanx for ur help guys.
      If u have any more ideas, please write them down

    17. Member codergfx's Avatar
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      10-27-2011 08:28 PM #17
      Does it sound like compressor surge?
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    18. 10-28-2011 03:33 AM #18
      Nope, compressor surge would be like FO FO FO FO FO FO FO...like when u disconnect vacuum hose from DV.

    19. Member codergfx's Avatar
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      10-28-2011 10:47 AM #19
      Quote Originally Posted by Strah View Post
      Nope, compressor surge would be like FO FO FO FO FO FO FO...like when u disconnect vacuum hose from DV.
      I have an idea you should take a video of how it sounds cuz I'm still not entirely sure lol
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    20. 10-28-2011 12:00 PM #20
      I will try that, however i am not sure if it would be noticable on my cell camera, or any video cam..

    21. 10-30-2011 08:37 AM #21
      I have recorded it, but it is not noticable at all
      Do u guys thing that my problem could be due to TIP collapsing or sucking unmetered air on the connection point with turbo? Maybe a hole in the TIP?

    22. Member codergfx's Avatar
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      10-30-2011 03:20 PM #22
      Idk if it's a hole in the tip but could be a faulty wastegate actuator if everything checks out. Check it by putting 4-5 psi to the actuator and see if it opens. Or actually just take the n75 out of the vacuum line circuit and leave it plugged in electrically and just hook up line from compressor housing to wastegate line. You should boost only 4-5 psi if it's smaller then that then ur wastegate is either needs to be tightened to open later or it's fAulty.
      Last edited by codergfx; 10-30-2011 at 03:23 PM.
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

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      11-01-2011 09:35 AM #23
      Quote Originally Posted by Strah View Post
      hmmm...now that u mentioned it...i noticed that car is louder than before, especially in the moment when i let go my throttle...ok, ill try to find that "seafoam"..hope we have it here in croatia...
      Hrvatinaaaaaa!!!! Gdje budes u hrvatskoj?

    24. 11-01-2011 11:21 AM #24
      So, here are some logs...obviously actual boost doesnt meet the requested one...




    25. Member codergfx's Avatar
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      11-01-2011 03:18 PM #25
      And alot of times that's what happens you can set requested boost to 20psi by redline but doesn't mean the turbo it self will hold it for you that high especially by redline. Get a log of boost duty vs boost pressure.
      Last edited by codergfx; 11-01-2011 at 03:20 PM.
      MY BUILD | 2003 Volkswagen GTI 1.8T | CTT - Carrot Top Tuning - GT3076r, 3" to 2.5" turboback exhaust (vbanded), Tial 38mm wastegate, fx400 6 puck, Peloquin LSD, VF Poly Engine Mounts, Greddy Profec B Type II, walbro 255 inline fuel pump, ID1600cc @ 3bar running on e85. AMB head, AWD bottom end. 434whp 369wtq @ 30psi (OLD: 383 whp 333wtq @ 23 psi)

    26. 11-01-2011 05:02 PM #26
      Well...i bought this car with tha map wich is a moderate stage 1 as u can see by the requested boost values..u can see that the map requests more or less 1 bar of boost..
      Wich block is boost duty vs boost pressure?

    27. 11-03-2011 06:22 PM #27
      Anyone to comment on these logs?

    28. 11-15-2011 05:52 PM #28
      No one?

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