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Horrible fuel mileage w 07 Pete 379, NXS 625hp Cat

Discussion in 'Trucks [ Eighteen Wheelers ]' started by CMTrucking, Dec 25, 2009.

Page 5 of 7
  1. Jan 12, 2010 #41
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    Welcome to the cat world :biggrin_25514: uh oh now i went did it!:biggrin_2559:
     
    2hellandback, Jan 12, 2010
    2hellandback, Jan 12, 2010
    #41
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  3. Jan 12, 2010 #42
    Jfaulk99

    Jfaulk99 Road Train Member

    2,914
    1,652
    May 16, 2009
    Couch
    0
    HAHA, yea I bet he'd be doing much better with a 625 ISX. Oops that's right they don't make one.:smt064:biggrin_2559:
     
    Jfaulk99, Jan 12, 2010
    Jfaulk99, Jan 12, 2010
    #42
  4. Jan 13, 2010 #43
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    You know what the cat 625 designation stands for ? 6 mpg at 25mph :biggrin_255:
     
    2hellandback, Jan 13, 2010
    2hellandback, Jan 13, 2010
    #43
  5. Jan 13, 2010 #44
    Jas

    Jas Medium Load Member

    569
    157
    Dec 13, 2008
    Eastern Sea board, Australia
    0

    Lmao, thats GOLD!!:biggrin_2559::biggrin_2559::biggrin_2559:
     
    Jas, Jan 13, 2010
    Jas, Jan 13, 2010
    #44
  7. Jan 13, 2010 #45
    CMTrucking

    CMTrucking Light Load Member

    85
    27
    Dec 25, 2009
    Kamloops, BC
    0
    I do have injector warranty for 5yrs/500k miles. Is there a way I can test them or do they need to be removed and checked by a technician? The pre-adjustment fuel rate was 31.4gph at 1800rpm, 22.0gph at 1200rpm. It was raised to 33.0 at 1800 and 23.7 at 1200. Fuel pressure went from 81.7 to 90.0 # 1800rpm.
     
    CMTrucking, Jan 13, 2010
    CMTrucking, Jan 13, 2010
    #45
  8. Jan 17, 2010 #46
    MedicineMan

    MedicineMan Road Train Member

    5,799
    6,440
    Jan 13, 2007
    Woodville, TX
    0
    Get the VIN off somebodies truck with a 5" downpupe and go get one.

    Otherwise I thi k its your driving. If u don't tenderfoot a big cat you will regret it. Also I've never found cats to be very weight sensitive. They get what they get at 30k or 60k lbs.

    That motor is built to lug down. And rol into it. I know your used to hauling those heavy loads and thas where those driving practices come from.
     
    MedicineMan, Jan 17, 2010
    MedicineMan, Jan 17, 2010
    #46
  9. Jan 17, 2010 #47
    CMTrucking

    CMTrucking Light Load Member

    85
    27
    Dec 25, 2009
    Kamloops, BC
    0
    No can do on the downpipe, the turbo has a 4" outlet.
    Yesterday I had my check engine light come on, saying Intake Actuator Valve 6 Not Responding, error code 290-7 if I recall correctly. It dereated me, a few minutes later the light went out and i got (most of) my power back. It seems like it's not pulling very well.
     
    CMTrucking, Jan 17, 2010
    CMTrucking, Jan 17, 2010
    #47
  10. Jan 18, 2010 #48
    Jas

    Jas Medium Load Member

    569
    157
    Dec 13, 2008
    Eastern Sea board, Australia
    0
    A 625 shouldn't have a 4 inch turbo outlet IMAO. have you measured the exhaust restriction at the turbo outlet? High exhaust restriction at the turbo will give all sorts of problems, the best free flowing mufflers in the world wont help if there is a restriction up stream at the turbo.
    If it does have a 4 inch outlet you should be able to get the 5 inch outlet from cat as the back part of the turbo exhaust housing bolts on.
     
    Jas, Jan 18, 2010
    Jas, Jan 18, 2010
    #48
  11. Jan 18, 2010 #49
    MedicineMan

    MedicineMan Road Train Member

    5,799
    6,440
    Jan 13, 2007
    Woodville, TX
    0
    it doesn't sound right to me either. I don't think i've ever seen a 4 inch housing and it certainly shouldn't be on a C16
     
    MedicineMan, Jan 18, 2010
    MedicineMan, Jan 18, 2010
    #49
  12. Jan 19, 2010 #50
    HISPEED428

    HISPEED428 Light Load Member

    157
    21
    Mar 28, 2009
    Plum Coulee,MB
    0
    It is a 4" housing but its not a C16.Mine is set up the same way.
     
    HISPEED428, Jan 19, 2010
    HISPEED428, Jan 19, 2010
    #50
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