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C15 low power

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Harper60, Dec 10, 2018.

Page 7 of 8
  1. Dec 12, 2018 #61
    Harper60

    Harper60 Bobtail Member

    37
    23
    Jan 9, 2017
    0
    Northwest Oklahoma
     
    Harper60, Dec 12, 2018
    Harper60, Dec 12, 2018
    #61
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  3. Dec 12, 2018 #62
    Cam Roberts

    Cam Roberts Road Train Member

    1,621
    1,937
    May 13, 2018
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    You are just going through some bull right now. Happens to us all when we buy new used trucks. You will get it figured out. If it’s still acting up, you might have to take a trip to cat. Those guys know their stuff.
     
    Cam Roberts, Dec 12, 2018
    Cam Roberts, Dec 12, 2018
    #62
  4. Dec 12, 2018 #63
    062

    062 Road Train Member

    5,852
    31,733
    Oct 20, 2013
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    You should see the difference once you get a load on it.
    Is this one geared the same?
     
    062, Dec 12, 2018
    062, Dec 12, 2018
    #63
  5. Dec 12, 2018 #64
    Harper60

    Harper60 Bobtail Member

    37
    23
    Jan 9, 2017
    0
    Actually my old truck was geared 3.36 and this one is geared 3.55
     
    Harper60, Dec 12, 2018
    Harper60, Dec 12, 2018
    #64
    jamespmack Thanks this.
  7. Dec 14, 2018 #65
    Harper60

    Harper60 Bobtail Member

    37
    23
    Jan 9, 2017
    0
    Well I'm pulling between 30-33 psi. 750 egts, I don't lose 10mph on these slight inclines anymore so I'd say all the things I did improved it. I'm going to flash to 550 or Im probably going to have a custom tune installed to get it where I want in pulling power. Thanks for all the help!
     
    Harper60, Dec 14, 2018
    Harper60, Dec 14, 2018
    #65
    jamespmack, Diesel Dave, Cam Roberts and 1 other person Thank this.
  8. Dec 15, 2018 #66
    jaielv

    jaielv Light Load Member

    62
    12
    Dec 30, 2010
    joliet,il
    0
    Did you check all your fuel lines sometime they go bad and the only way to test is buy doing a clean fuel test just install a house from the transfer pump to a bucket with clean fuel. Also check return line is not restricted . Or a cracked filter housing
     
    jaielv, Dec 15, 2018
    jaielv, Dec 15, 2018
    #66
  9. Dec 17, 2018 #67
    DieselTech_Aus

    DieselTech_Aus Light Load Member

    274
    309
    Dec 20, 2017
    WA
    0
    3049385 check valve
    3394983 spring kit

    those two genuine cat parts with a late model transfer pump with the allen key screw in the side not the bolt head looking plug will see fuel pressure at low idle of 90-100psi and high idle of 110-115psi.

    to ensure the CAC system is in good order I fir a 6 inch adapter to the inlet of the turbo and fir a blacking plate behind the inlet at the head, I use air and a regulator to pressurize to 35/40psi. this will check the entire system has no leaks. boost leaks cost power even when minor. they also kill fuel economy.

    flashing an early file that is pre noX will help with power too.

    you should see 28-30psi boost on factory turbo at 550hp. wastegate blocked should see 32-33psi. I dotn advise this as the standard turbine housing with the gate is on its limit for flowing enough volume to support 550hp. blocking the gate means ALL gas must go around the wheel to exit which choked up the engine and adds significant exhaust backpressure. this adds to cylinder temp and pressure also.

    I despise "hot" trim files on stock injectors because the tip is not big enough to do what you're asking without having such a large window of injection in reference to crankshaft revolution that isn't ideal for efficient engine operation. however for purpose of diagnostics they can work great. use them. if you see no increase in EGT, exhaust smoke and power then their is a greater issue.
     
    DieselTech_Aus, Dec 17, 2018
    DieselTech_Aus, Dec 17, 2018
    #67
    Oxbow, swaan and spsauerland Thank this.
  10. Feb 14, 2019 #68
    Mario35

    Mario35 Bobtail Member

    12
    4
    Jan 29, 2019
    0
    Did you ever find out what it was...sounds like same thing I'm going through except I have a cat C12 and I just put a brand new intercooler/CAC last Friday still nothing... Been driving my truck all week like this. Driving me crazy.
     
    Mario35, Feb 14, 2019
    Mario35, Feb 14, 2019
    #68
  11. Feb 14, 2019 #69
    Harper60

    Harper60 Bobtail Member

    37
    23
    Jan 9, 2017
    0
    Well no, I put my stock ecm back on, I had a new ecm with a hot tune on it and it helped it a lot but topend still fell on its face. I bought a new pump and it was bad out of the box but as soon as the new one comes in I'm swapping it in. All my stuff checks out okay. I have a new teltek fuel pressure guage and its showing 95psi at 1400 loaded. I'm just gonna drive it like this for a while and I'm planning on doing injectors next since I have an apparent flutter at 1200-14500rpm under heavy throttle. I figured the hot tune made the bad Injector show itself due to more fueling. The truck makes me money, just doesnt like the hills in the Texas panhandle. When I get my new Injectors I'll update, I saw Rochester diesel sells Injectors that are flow matched to a set, thinking about going that route over cat
     
    Harper60, Feb 14, 2019
    Harper60, Feb 14, 2019
    #69
  12. Mar 13, 2019 #70
    Sohumtrucker

    Sohumtrucker Bobtail Member

    8
    1
    Mar 13, 2019
    0
    Do they still make c15s someone was advertising a 2016 c 15
     
    Sohumtrucker, Mar 13, 2019
    Sohumtrucker, Mar 13, 2019
    #70
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