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looking to change my axle ratio

Discussion in 'Trucks [ Eighteen Wheelers ]' started by rank, May 30, 2014.

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  1. Jun 1, 2014 #141
    allan5oh

    allan5oh Road Train Member

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    He's absolutely right. The driveline spins slower.
     
    allan5oh, Jun 1, 2014
    allan5oh, Jun 1, 2014
    #141
    Richter Thanks this.
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  3. Jun 1, 2014 #142
    rank

    rank Road Train Member

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    Do you suppose it's because they think he'll wreck the pinion gear? Or a U-joint. The ring and pinion is where the rubber meets the road with the tall rear gear.
     
    rank, Jun 1, 2014
    rank, Jun 1, 2014
    #142
  4. Jun 1, 2014 #143
    rank

    rank Road Train Member

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    So you agree with Richter that the driveshaft spins faster in OD than in direct? Therefore to maintain ground speed the driver needs to reduce engine speed correct?
     
    rank, Jun 1, 2014
    rank, Jun 1, 2014
    #143
  5. Jun 1, 2014 #144
    rank

    rank Road Train Member

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    maybe because they want you to get under there and notice that the U-joint is going away.
     
    rank, Jun 1, 2014
    rank, Jun 1, 2014
    #144
  7. Jun 1, 2014 #145
    Superhauler

    Superhauler TEACHER OF MEN

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    i like where your going with this.
     
    Superhauler, Jun 1, 2014
    Superhauler, Jun 1, 2014
    #145
    rank Thanks this.
  8. Jun 1, 2014 #146
    allan5oh

    allan5oh Road Train Member

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    The overdrive transmission does that.

    1500 rpm / 1 = 1500 driveshaft rpm in direct

    1500 / 2.64 = 568 axle revolutions per minute

    1500 / .73 = 2054 driveshaft rpm in OD

    2054 / 3.55 = 578 axle revolutions per minute

    on the overdrive setup the driveshaft is spinning 37% faster.
     
    allan5oh, Jun 1, 2014
    allan5oh, Jun 1, 2014
    #146
    Richter Thanks this.
  9. Jun 1, 2014 #147
    rank

    rank Road Train Member

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    I hear crickets. I think Mister Richter said he was driving the simulator at 3 so we'll have to wait. That will give us time to discuss my original question.

    I thought I wanted to run the 3406B at 62 mph @ ~1400 but some of you said hold off because they like to spin. Every engine I have driven (N14, M11, 14L Series 60, 6NZ, Acert, ISX) makes peak T around 1200 and peak HP around 1800 - 2000. Are these old Cats the same or are they higher or is it all in how the pump is set up and maybe I just need to do a seat of the pants dyno?
     
    rank, Jun 1, 2014
    rank, Jun 1, 2014
    #147
  10. Jun 1, 2014 #148
    rank

    rank Road Train Member

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    Does what?
     
    rank, Jun 1, 2014
    rank, Jun 1, 2014
    #148
  11. Jun 1, 2014 #149
    allan5oh

    allan5oh Road Train Member

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    It's a mechanical. They need more RPM because they cannot vary the timing.
     
    allan5oh, Jun 1, 2014
    allan5oh, Jun 1, 2014
    #149
  12. Jun 1, 2014 #150
    allan5oh

    allan5oh Road Train Member

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    "driver reduce engine speed" I don't understand where you're going with that. The overdrive setup the driveshaft is spinning 37% faster for the same engine speed. That's why it is reduced at the transmission.

    Both trucks are hitting a hill at 60 at 1500 engine rpms. They have the same OVERALL mechanical advantage on the axles. They both go up the hill exactly the same.
     
    allan5oh, Jun 1, 2014
    allan5oh, Jun 1, 2014
    #150
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