Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Do turbos need exhaust backpressure?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by TallJoe, Feb 28, 2017.

Page 1 of 2
  1. Feb 28, 2017 #1
    TallJoe

    TallJoe Road Train Member

    7,490
    16,266
    Apr 12, 2016
    Chicagoland
    0
    I heard that especially newer trucks with dpf systems have turbos designed so that they need exhaust back pressure.Why would they need the back pressure? What good does it do? I am a layman on this... The exhaust fumes propel the turbines and then leave the system through dpf. What's defined as the back pressure here? The pressure on the turbine or the pressure generated by the fumes that already went past the turbo? If the latter then why the back pressure is of any significance on a turbo performance?
     
    TallJoe, Feb 28, 2017
    TallJoe, Feb 28, 2017
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Feb 28, 2017 #2
    DL550CAT

    DL550CAT Road Train Member

    1,427
    1,481
    Oct 18, 2009
    Waynesburg, Pa
    0
    Back pressure after the turbo does not do any good.
     
    DL550CAT, Feb 28, 2017
    DL550CAT, Feb 28, 2017
    #2
    dustinbrock, Cat sdp, tony97905 and 2 others Thank this.
  4. Mar 1, 2017 #3
    Aradrox

    Aradrox Heavy Load Member

    900
    620
    Jan 21, 2016
    0
    Does too it uhhhh makes things uhhhh pressury uhhh... Ok ya no good
     
    Aradrox, Mar 1, 2017
    Aradrox, Mar 1, 2017
    #3
  5. Mar 1, 2017 #4
    benjamin260_6

    benjamin260_6 Medium Load Member

    426
    473
    Aug 8, 2012
    Ontario, Canada
    0
    Neither engines nor turbos require back pressure to work and they work best without any at all. That being said, it's my understanding that if there's no back pressure between the turbo and DPF, the ECM will assume the DPF is malfunctioning and throw a code but that has nothing to do with the turbo's ability to function correctly.
     
    benjamin260_6, Mar 1, 2017
    benjamin260_6, Mar 1, 2017
    #4
    SnowMan24 and TallJoe Thank this.
  7. Mar 1, 2017 #5
    ShooterK2

    ShooterK2 Road Train Member

    5,533
    89,469
    Dec 14, 2012
    Oklahoma
    0
    The turbo on my old '99 W9 with N14 works just awesome, and I've got straight pipes. No DPF, no muffler, no back pressure. She will peg the boost gauge around 1300 rpm and stay there till I back out. I don't know how it could possibly work any better.
     
    ShooterK2, Mar 1, 2017
    ShooterK2, Mar 1, 2017
    #5
    SnowMan24, TallJoe, Dave_in_AZ and 1 other person Thank this.
  8. Mar 1, 2017 #6
    gokiddogo

    gokiddogo Road Train Member

    8,781
    14,753
    Mar 5, 2012
    Ontario Canada
    0
    They need back pressure to ensure a turbo life of about 400,000 miles, at which point they sell you another one for some $6,000. Old turbo maybe $800 live for twice as long.
     
    gokiddogo, Mar 1, 2017
    gokiddogo, Mar 1, 2017
    #6
    TallJoe Thanks this.
  9. Mar 1, 2017 #7
    Bakerman

    Bakerman Road Train Member

    4,663
    8,806
    Jan 27, 2013
    Phoenix, AZ
    0
    Too much back pressure on my N14 many years ago bent my turbo shaft. Had to replace my turbo & my muffler.
     
    Bakerman, Mar 1, 2017
    Bakerman, Mar 1, 2017
    #7
    ShooterK2 and TallJoe Thank this.
  10. Mar 1, 2017 #8
    TallJoe

    TallJoe Road Train Member

    7,490
    16,266
    Apr 12, 2016
    Chicagoland
    0
    That's exactly how much I had to spend on mine (including actuator).The truck maybe worth 25k and the stupid turbo in it is 1/4 of the value. Nonsense!
     
    TallJoe, Mar 1, 2017
    TallJoe, Mar 1, 2017
    #8
    ShooterK2 Thanks this.
  11. Mar 1, 2017 #9
    TallJoe

    TallJoe Road Train Member

    7,490
    16,266
    Apr 12, 2016
    Chicagoland
    0
    There reason I am asking about the back pressure is that some say that turbo needs it, others that it's quite contrary, that it in trucks with dpfs the turbos (including mine I had to replace a year and a half ago) are subjected of much more stress/soot and they go bad. Mine started making whizzing sounds again at high dynamic boosts (when I really step on it while I haul heavy) but not very consistently. Also the pipe going from it to air charge cooler, has some traces of oil. I don't lose oil, but it must be dripping some in to the pipe. So 6K again? Maybe I should leave the actuator and replace just the turbo. I am not doing it yet, but it seems imminent.
     
    TallJoe, Mar 1, 2017
    TallJoe, Mar 1, 2017
    #9
  12. Mar 1, 2017 #10
    TallJoe

    TallJoe Road Train Member

    7,490
    16,266
    Apr 12, 2016
    Chicagoland
    0
    Having said that. Had I not had DPF, would it be true to say that the turbo would have lasted longer?
     
    TallJoe, Mar 1, 2017
    TallJoe, Mar 1, 2017
    #10
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 1 of 2