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Performance Issues

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by insanityeight, Feb 4, 2018.

Page 2 of 3
  1. Jan 9, 2019 #11
    steve092

    steve092 Light Load Member

    298
    79
    Dec 7, 2015
    0
    I've tried everything to getter better MPG on the EPA10 Paccar.

    Replaced all Nox sensors
    Replaced Turbo Pressure sensor
    Replaced Air temp sensor
    Did overhead adjustment
    Air to air - everything checked out fine...

    Just did the clutch but that has nothing to do with MPG lol...

    I struggle to hold 6MPG, to achieve 6.4 I have to literally slow down and not hit the accelerator pedal up the hill....

    Gross around 75 to 80k

    2013 386 Super40s
    3.73 rears 18speed 455
    22.5 rubbers

    What are my options? I heard Diesel spec is pretty good with what they do.

    Anything I should look at like Peterbilt Paccar new software updates, alignments, air tire pressure, suspension?

    Truck is equipped with a PTO... NEVER USE IT..

    I have seen more geniuses on here than all the shops in the GTA combined....
     
    steve092, Jan 9, 2019
    steve092, Jan 9, 2019
    #11
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  3. Jan 10, 2019 #12
    insanityeight

    insanityeight Light Load Member

    287
    111
    Jul 26, 2013
    birmingham al
    0
    Best i did with delete and custom tune was about 6.2 average running over 40,000 always and doing 70 mph, sometimes slightly faster. Havent met anyone who truly gets the great fuel mileage unless the run 64
     
    insanityeight, Jan 10, 2019
    insanityeight, Jan 10, 2019
    #12
  4. Jan 10, 2019 #13
    steve092

    steve092 Light Load Member

    298
    79
    Dec 7, 2015
    0

    You have a EPA 13 truck as well right?
     
    steve092, Jan 10, 2019
    steve092, Jan 10, 2019
    #13
  5. Jan 10, 2019 #14
    insanityeight

    insanityeight Light Load Member

    287
    111
    Jul 26, 2013
    birmingham al
    0
    Epa 10
     
    insanityeight, Jan 10, 2019
    insanityeight, Jan 10, 2019
    #14
  7. Jan 10, 2019 #15
    steve092

    steve092 Light Load Member

    298
    79
    Dec 7, 2015
    0
    How is the truck now compared to before?

    I struggle to hold 6mpg if I do run 64 all the way I'll probably see 5.6-5.8

    I'm also not unchoked at the moment, how much power is the truck now?
     
    steve092, Jan 10, 2019
    steve092, Jan 10, 2019
    #15
  8. Jan 10, 2019 #16
    insanityeight

    insanityeight Light Load Member

    287
    111
    Jul 26, 2013
    birmingham al
    0
    The power is better but performance and throttle response were the biggest improvements. But its been mechanically trouble free since delete with 530,000 miles. My apu is down and i idle at night and still do 5.9 and i drive it hard
     
    insanityeight, Jan 10, 2019
    insanityeight, Jan 10, 2019
    #16
  9. Jan 10, 2019 #17
    steve092

    steve092 Light Load Member

    298
    79
    Dec 7, 2015
    0
    Not bad if you idle all night and still around the 6 mark.

    Who did the work for you? Shoot me a PM I'm in the market for the same work.
     
    steve092, Jan 10, 2019
    steve092, Jan 10, 2019
    #17
  10. Jan 10, 2019 #18
    insanityeight

    insanityeight Light Load Member

    287
    111
    Jul 26, 2013
    birmingham al
    0
    Mikes truck and trailer in woodstock alabama. Also around the block from him is butch carrolls truck repair. My truck is at butches now getting a few tweaks and im told they are the best in southeast by a few people but i didnt know til now. Just avoid matt with southern diagnostic soulutions. He screwed my pooch.
     
    insanityeight, Jan 10, 2019
    insanityeight, Jan 10, 2019
    #18
  11. Jan 10, 2019 #19
    insanityeight

    insanityeight Light Load Member

    287
    111
    Jul 26, 2013
    birmingham al
    0
    My truck had that progressive shifting crap limiting it to 1500 rpm. Butch is one of the few ive seen that can undo that crap for a few hundred bucks
     
    insanityeight, Jan 10, 2019
    insanityeight, Jan 10, 2019
    #19
  12. Mar 3, 2021 #20
    Long-haul

    Long-haul Bobtail Member

    9
    2
    Jan 9, 2019
    0
    Wouldn't have any diagrams for an epa 10 mx13 485 hp
    Vin 331897 Kw T700..
    Same kinda issues. Motor is still neutered, done 6 injectors & 5 pumps at about 700k. Got 1million on her now. Original turbo, overheads have been done on time,, dpf cleanings done on time.. No power below 1500 rpm & when she does decide to get some guts it's sporadic & still wants to be at that 1500 mark to do it.. Ugh..
     
    Long-haul, Mar 3, 2021
    Long-haul, Mar 3, 2021
    #20
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