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Getting Better Fuel Mileage

Discussion in 'Trucks [ Eighteen Wheelers ]' started by maxeffort, Apr 23, 2008.

Page 6 of 11
  1. Jul 20, 2008 #51
    550hpW900L

    550hpW900L Road Train Member

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    Might not hurt the motor, but the rest i dont know.
     
    550hpW900L, Jul 20, 2008
    550hpW900L, Jul 20, 2008
    #51
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  3. Jul 20, 2008 #52
    Brickman

    Brickman Trucker Forum STAFF Staff Member

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    Most of what was written is pretty good. But I've got to disagree with several points.
    It has NOT been my experience that COE gets better MPGs, not even close.

    Large car trucks even ones pulling a skate board can and do get good MPGs. They have to be driven properly and at a sane speed.

    Myself and mechanics every where will major disagree with you on this one. Never and I do mean never shut down a hot engine with no idle time. I know what you are saying about light throttle into your fuel stop or other stop, but on a hot day this is no where close to enough turbo bearing cool down period. Shutting down while too hot cooks the oil in the turbo bearings and will kill your turbo quick. That 5 or 10 mins of idle cool down will sure seem cheap when faced with a premature turbo replacement.
     
    Brickman, Jul 20, 2008
    Brickman, Jul 20, 2008
    #52
    alds, tho5243, Baack and 2 others Thank this.
  4. Jul 20, 2008 #53
    Brickman

    Brickman Trucker Forum STAFF Staff Member

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    Even a C 15 pre bridge/Acert does not like to lug that low.

    I have already came around a corner loaded on relatively flat ground or slightly up hill and picked it up from there but to lug it down that far on an uphill pull does not result in happy driving.
     
    Brickman, Jul 20, 2008
    Brickman, Jul 20, 2008
    #53
  5. Jul 20, 2008 #54
    550hpW900L

    550hpW900L Road Train Member

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    Very well said Brick!
     
    550hpW900L, Jul 20, 2008
    550hpW900L, Jul 20, 2008
    #54
    Brickman Thanks this.
  7. Jul 20, 2008 #55
    550hpW900L

    550hpW900L Road Train Member

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    Yeah and couple that with a GINORMOUS turbo with lag down low and you got yourself a recipe for something breaking!
     
    550hpW900L, Jul 20, 2008
    550hpW900L, Jul 20, 2008
    #55
  8. Jul 21, 2008 #56
    MedicineMan

    MedicineMan Road Train Member

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    actually Brick COE's can be the most fuel efficient if done properly. Wind drag is dependant on total frontal surface area first and formost, then to a lessor degree the angle of that surface. You can have a big square coe with less frontal area (much less) the say a 379 pete. The main reason the fuel milage sucks on most coe trucks is that they were mainly around in the mechanical engine days.
    Mabey you remember that really ugly coe peterbilt made for a few years in the 90's. it was real rounded and the front opened up like a sideways clamshell for servicing the engine. That truck with a trailer that had some aero treatments was capable of getting 10 or 11 mpg
     
    MedicineMan, Jul 21, 2008
    MedicineMan, Jul 21, 2008
    #56
    sano Thanks this.
  9. Jul 22, 2008 #57
    maxeffort

    maxeffort Bobtail Member

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    If you basically coast in, It's not much different than idling, hence the reason for no or very little cooldown. The turbo will not cool any more than the idle exhaust temp, no matter how long you idle it.

    So if you have a pyro and the exhaust temp was way down on the ramp, around the lot the turbo will not get much cooler if at all. Please if it makes you feel comfortable, be on the safe side 2-3 minutes is fine and won't use up much fuel.

    Whole different story if you pulled a hill before stopping. You will need the five minutes for sure.


    With any truck, set up has to right. As I wrote earlier, CAT made close to 11 mpg with a COE, but it was set up and driven properly.

    Wind tunnel testing has shown that a COE is the best with a VAN trailer. May not be as good with a skatebord.
     
    maxeffort, Jul 22, 2008
    maxeffort, Jul 22, 2008
    #57
  10. Jul 22, 2008 #58
    maxeffort

    maxeffort Bobtail Member

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    I think were on the same wavelength here. The very low RPM applies to cresting the hill. I don't think long continuous pulling below 1100 is a great idea. If you can crest at 1000rpm, it's not bad, rather than grab a gear at the crest. 900rpm is getting very low and pretty tough for the engine to recover.
     
    maxeffort, Jul 22, 2008
    maxeffort, Jul 22, 2008
    #58
  11. Jul 22, 2008 #59
    maxeffort

    maxeffort Bobtail Member

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    Well done.
     
    maxeffort, Jul 22, 2008
    maxeffort, Jul 22, 2008
    #59
  12. Jul 22, 2008 #60
    soon2betrucking

    soon2betrucking Road Train Member

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    Hey max, that is a really good way of explaining it, i hate engines, and when it comes to mechanics, i leave it to the mechanics, but i do what i have to do to make sure my baby never fails me :biggrin_25522:
    i have maneged to increase my mpgs from 6.2 upto 7.3 in a month,
    i printed everything you said and i put it in my truck, and i read it, and then re-read and try my best to do everything you said, or when i go to our shop i take it in with me, and suggest he tries some of these tips on my truck, he now hates when i walk down there with papers in hand :biggrin_25514: but in the end, im usually the one to have the least problems with my truck :biggrin_25525:
     
    soon2betrucking, Jul 22, 2008
    soon2betrucking, Jul 22, 2008
    #60
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