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gio400

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Posts posted by gio400

  1. 55 minutes ago, 67RModel said:

    Mack top loader axles are a double reduction design. Basically the torque multiplication is done in two steps rather than one. Much less strain on components and less of a chance to break things. Much more desirable for what you are attempting to do.

    With 8ll and 6.14 ratio will give me 89.39  %reduction in ll and in ll reverse 93.45 % wouldn’t that be good

  2. 5 hours ago, 67RModel said:

    I foresee lots of driveline abuse and broken axle shafts or universal joints. Do you understand how steep a 30% grade is? A lot of people would struggle to walk up a 30% grade. Canton Avenue in Pittsburgh is often cited officially and unofficially as the steepest public street in North America at 37% grade. I have driven up and down it in a Honda car and it was scary quite frankly. Plus the top 2/3 are made of brick. Technically your not allowed to drive down it only up. I could not imagine driving up that hill in a truck loaded with 4000 gallons of water. Let alone stopping a 4000 gallon tanker on that hill and trying to get started again. If you did you would never shift out of Low gear until you reached the top. Forget 400hp. What you need is lots of gear reduction preferably planetary reductions at the wheel ends. Are the axles in the truck Mack top loader double reduction or conventional Meritor axles? I honestly would be worried about starving the engine for oil at such an extreme angle. I'm not familiar with where the oil pickup(s) are on these trucks but depending on where it is you might be sucking wind either going up or down. 

    https://en.wikipedia.org/wiki/Canton_Avenue#:~:text=Canton Avenue is a street,street in the United States.&text=Canton Avenue is 630 ft,feet (6.4 m) long.

     

    CantonAve_Bottom.jpg

    44 meritor axles with 6.14 ratio

  3. 5 hours ago, JoeH said:

    Depends how good you are with a clutch.

    What year is the truck? The vmac III engines the computer will assist by maintaining idle as a minimum.

    On a hill from a dead stop, you have one foot on clutch, one on brake.   Use lowest gear you have, which on an 8LL is LL. Ease the clutch out til you feel it make contact and start to grab just enough to hold truck from rolling backwards, then your brake foot moves to accel pedal and gives it an extra couple hundred rpms at most while your left foot eases the clutch out the rest of the way.

    Truck is a 2001 with etech 400

    • Like 1
  4. 31 minutes ago, Joey Mack said:

    From what I re ember, that setup is pnuematic.  It is a simple system using boost pressure to open the waste gate when boost is too high.  I do not recall a computer is used to control it..  You should be able to un hook the accuator and move the lever to see if the ring nozzle is sticking. also the pin could be frozen which will jam the ring nozzle in any position.  I believe the accuator is replaceable with out needing a computer..   I have also taken these turbos apart to clean the ring nozzle..  You have options.  It would be good to see a picture of the turbo..  Jojo

    With the Viens stuck open , will the truck burn more fuel?

  5. 6 hours ago, fjh said:

    pyro temp up with no go ! the turbo exhaust snail will look blueish also ! NOTE the year and model of truck would help here! Just sayin! The waste gate was used in two years of trucks 2001- 2003 I believe !  Max boost 33 Psi and then everything changed to the EGR fiasco  either VGT or AI !

    It’s a vnt turbo, so which means the vents were stuck on open, it’s a 2004 Detroit 12.7 series 60 egr

  6. 3 minutes ago, BOBWhite said:

    Hardly any boost and it won't make much noise. Depending on the model you should be able to manually move the actuator to see if it's stuck. 

    Will it be dumping a lot of fuel also?

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