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C15 mxs twin turbo only reaching 10psi max?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HDiesel, May 30, 2018.

  1. May 30, 2018 #1
    HDiesel

    HDiesel Bobtail Member

    12
    11
    May 30, 2018
    0
    What's up guys, I'm having a bit of a problem and I'm hoping one of yall can point me in the right direction here, the truck is a 2005 pete, with an mxs twin turbo engine. At first we had no boost, (waste gate malfunction, and leaks) now that the leaks have been repaired and new high pressure turbo installed, we only get Max 10 psi boost, I've checked all the boots, CAC, precooler, checked turbos (new one too just in case) for broken shafts or bent turbine fins, the fuel pressure at idle sits at 64 and under load 85, no diagnostic codes, only fault code that was registered before was speed sensor fault, but has since been replaced and is working, anything will help, thanks!
     
    HDiesel, May 30, 2018
    HDiesel, May 30, 2018
    #1
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  3. May 31, 2018 #2
    spsauerland

    spsauerland Road Train Member

    4,296
    10,887
    May 31, 2010
    West Harrison, In
    0
    You have access to Cat ET?
     
    spsauerland, May 31, 2018
    spsauerland, May 31, 2018
    #2
    SAR Thanks this.
  4. May 31, 2018 #3
    HDiesel

    HDiesel Bobtail Member

    12
    11
    May 30, 2018
    0
    Yes sir I do
     
    HDiesel, May 31, 2018
    HDiesel, May 31, 2018
    #3
  5. May 31, 2018 #4
    lilillill

    lilillill Sarcasm... it's not just for breakfast

    5,642
    13,471
    Nov 7, 2007
    Possum Booger, Alabama
    0
    Exhaust restriction? Can you see through the mufflers? No birds nests or anything?

    Is it black smoking?

    And thirdly, are you using the stock gauge with the sintered brass filter in the line at the motor? Clean or replace the filter and/or try another gauge.
     
    lilillill, May 31, 2018
    lilillill, May 31, 2018
    #4
    SAR, spsauerland and HDiesel Thank this.
  7. May 31, 2018 #5
    HDiesel

    HDiesel Bobtail Member

    12
    11
    May 30, 2018
    0
    Turned out to be exhaust restriction, good call, getting up to 40 psi boost now.
     
    HDiesel, May 31, 2018
    HDiesel, May 31, 2018
    #5
    SAR and lilillill Thank this.
  8. Jun 6, 2018 #6
    DieselTech_Aus

    DieselTech_Aus Light Load Member

    274
    309
    Dec 20, 2017
    WA
    0
    blocked exhaust causes pressure build up to act as load for the turbine wheel. the load reduces the speed the turbine wheel can spin reducing the efficiency of the whole compound system
     
    DieselTech_Aus, Jun 6, 2018
    DieselTech_Aus, Jun 6, 2018
    #6
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