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Top speed

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Mr. Me, Feb 11, 2009.

Page 1 of 5
  1. Feb 11, 2009 #1
    Mr. Me

    Mr. Me Light Load Member

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    Feb 11, 2009
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    So, how much can those big rigs go? I saw on youtube in posts that some guy mentions 190 km/h(115mp/h or something like that). So, is that true? He says that a lot of us trucks can go that fast. I'm from Europe and most of european trucks have limiters on 85-90km/h (50-55mph). But even when they dont, they mostly can go 75mph-80mph...Rare ones can go 90+, but not over 100 mph...
     
    Mr. Me, Feb 11, 2009
    Mr. Me, Feb 11, 2009
    #1
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  3. Feb 11, 2009 #2
    LandShark

    LandShark Road Train Member

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    well i can do over 100mph in mine HOWEVER i dont go that fast but I have the ablity
     
    LandShark, Feb 11, 2009
    LandShark, Feb 11, 2009
    #2
  4. Feb 11, 2009 #3
    heyns57

    heyns57 Road Train Member

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    near Kalamazoo Speedway
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    Some companies will not lease an owner-operator tractor with excessive speed capabilities. One of my employers would jack up a wheel and count the drive line revolutions to determine drive axle ratio. Knowing this would be part of the pre-lease inspection, owner-operators would have different gears installed at Valley Equipment. Valley was very accommodating, charging only for the labor while the gears were on loan.
     
    heyns57, Feb 11, 2009
    heyns57, Feb 11, 2009
    #3
  5. Feb 11, 2009 #4
    DD14

    DD14 Light Load Member

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    Jan 21, 2009
    Ontario
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    I guess if you have the gearing and the power to pull it you can have quite a high top speed.I'll give you a couple of examples.Super 13or18-.73 top gear and 3.55 on 11r24.5=102mph at 2100rpm. If you went to LP24 or 11R22 you would loose about 4 or 5 mph.I run a super 18,3.08 on LP24 and at 2100 it would be about 111mph.
     
    DD14, Feb 11, 2009
    DD14, Feb 11, 2009
    #4
  7. Feb 11, 2009 #5
    Mr. Me

    Mr. Me Light Load Member

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    Feb 11, 2009
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    Well, that 111mph is quite a speed...But can those trucks go over 2100 rpm? And what gearing have those "pimped" trucks? I saw somewhere Mack Titan with 3,36 and double over (i guess it's 0.7 in last gear)...truck had about 800hp.

    BTW what are gears on these super 13 or 18? I mean, ratio in first and last gear?
    Sorry for lame tenses, English is not really my native language :biggrin_25520:
     
    Mr. Me, Feb 11, 2009
    Mr. Me, Feb 11, 2009
    #5
  8. Feb 11, 2009 #6
    DD14

    DD14 Light Load Member

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    Jan 21, 2009
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    The top gear on the super 13/18 is .73 .There are programs that can access higher RPMs,it seems Cats can easily go to 2300rpm and I have had DD's that would go to 2500.You need alot of HP to get to those top speeds and it is also dependant on how aerodynamic your combo is.What you think your truck does after the speedo runs out at 85 and what the reality is can be very different.
     
    DD14, Feb 11, 2009
    DD14, Feb 11, 2009
    #6
  9. Feb 11, 2009 #7
    550hpW900L

    550hpW900L Road Train Member

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    Jan 29, 2008
    norcal
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    I ran 114mph, gps showing, turning 2300rpm in my W9, 18 speed .73 OD and 3.55s......... 2300rpm C16 heavy haul program for the win!!!!
     
    550hpW900L, Feb 11, 2009
    550hpW900L, Feb 11, 2009
    #7
  10. Feb 11, 2009 #8
    Rock hauler

    Rock hauler Light Load Member

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    Nov 26, 2008
    Deridder La.
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    92 pete 425B RTXO14613(.60 overdrive) 3.70 2100 RPM, 118 MPH
     
    Rock hauler, Feb 11, 2009
    Rock hauler, Feb 11, 2009
    #8
  11. Feb 11, 2009 #9
    DD14

    DD14 Light Load Member

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    That RTXO would need to have a top gear of .5_?At .60 it comes out to 114mph.
     
    DD14, Feb 11, 2009
    DD14, Feb 11, 2009
    #9
  12. Feb 11, 2009 #10
    Rock hauler

    Rock hauler Light Load Member

    264
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    Nov 26, 2008
    Deridder La.
    0
    2100 x 60 = 126000 devided by .60 = 210000 devided by 3.70 = 56756.756 devided by 476(11r24.5 tires rounds per mile) = 119.23 MPH. truck had Harly 120 MPH speedometer, showed 118. do the math, sir
     
    Rock hauler, Feb 11, 2009
    Rock hauler, Feb 11, 2009
    #10
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