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For the gear heads

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jamespmack, Aug 30, 2017.

  1. Aug 30, 2017 #1
    jamespmack

    jamespmack Road Train Member

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    Mar 25, 2014
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    I have more years under one than in them. But still need help with a thought. Im thinking about running 6 inch exhaust 2 foot after turbo pipe to rear of cab. I have a single behind cab stack. I know not cool, but I like light weight and they are way quieter back there. Its not quiet but in the cab it is. I know that standard single vs dual is only a 14 degree difference. Im just wondering if it would help flow and temp? Any thoughts welcome. Im am running a 12.7l dedec4. 518 horse to tires, 1650 torque. Have plans to go higher.
     
    jamespmack, Aug 30, 2017
    jamespmack, Aug 30, 2017
    #1
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  3. Aug 30, 2017 #2
    Fronningen

    Fronningen Bobtail Member

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    Aug 15, 2017
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    If you plan on going higher horsepower definitely go duals. Anything to help it breathe will help make some power with more fuel being put to it, and more fuel = higher egts, and if 14 degrees has the potential difference between melting metals and solid metals, go with duals. But mostly because it'll look cooler.
     
    Fronningen, Aug 30, 2017
    Fronningen, Aug 30, 2017
    #2
  4. Aug 31, 2017 #3
    jamespmack

    jamespmack Road Train Member

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    Im all "go" no "show". Yes it looks good but would add a 150lbs or so. I try for neat and clean.
     
    jamespmack, Aug 31, 2017
    jamespmack, Aug 31, 2017
    #3
  5. Aug 31, 2017 #4
    spyder7723

    spyder7723 Road Train Member

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    You'd gain more by sending one out the bottom than 2 up the back. That 90 degree bend creates a lot of back pressure.
     
    spyder7723, Aug 31, 2017
    spyder7723, Aug 31, 2017
    #4
  7. Sep 2, 2017 #5
    Junkyard Johnney

    Junkyard Johnney Light Load Member

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    May 27, 2012
    Plains,Mt
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    Dual it off, more horsepower = more fuel and air, if you put it in you have to get it out. If you are into performance air flow , air flow , air flow , keep it cool. 2 foot after the turbo the whole way will more than make up the difference on any turns, do the math. That is exactly where I am headed with mine next. 12.7 DDC3 525 horses 1750 torque right now, runs with my buddies 550 kitty all day long and I never see his tailights.
    later J-J
     
    Junkyard Johnney, Sep 2, 2017
    Junkyard Johnney, Sep 2, 2017
    #5
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