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Trucks [ Eighteen Wheelers ] Roll On Big Mama. Forum/Discussion about Eighteen Wheeler Trucks. What truck do you like or dislike? Is your favorite truck a Mack, Peterbilt, Kenworth, Marmon, Volvo or Freightliner? Which diesel engine do you prefer; Detroit Diesel, Cummins, or...

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  ^ Top   #41  
Old 08.01.2008
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This is an unrelated question:

Which ratio is better (more fuel efficient) for a truck with 24.5" tires, 3:36, 3:55, 3:58, or 3:73?
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  ^ Top   #42  
Old 08.02.2008
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Depends on engine power and terrain you will be operating in. Gear it fast and run it slow.
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  ^ Top   #43  
Old 08.02.2008
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Quote:
Originally Posted by Native Dancer View Post
Depends on engine power and terrain you will be operating in. Gear it fast and run it slow.
Lets say a DD15 560hp/1850lbft. Roads are a mixture of steep hills and flat surfaces.

Which ratio would be the best for 22.5 and 24.5 tires?
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  ^ Top   #44  
Old 08.03.2008
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I would go with 3:55 with 24.5 and probably 3:36 with 22.5.
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  ^ Top   #45  
Old 08.03.2008
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Quote:
Originally Posted by Native Dancer View Post
I would go with 3:55 with 24.5 and probably 3:36 with 22.5.
Thanks.

Anyone else have any opinions, or are you all basically on the same boat?
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  ^ Top   #46  
Old 08.03.2008
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I wouldnt run 3.55s on a DD15. 3.25 or 3.36 tops.
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  ^ Top   #47  
Old 08.03.2008
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Quote:
Originally Posted by 550hpW900L View Post
I wouldnt run 3.55s on a DD15. 3.25 or 3.36 tops.
Why?

Isn't is that you need a larger ratio for more torque?

Also keep in mind I will be using 24.5 tires.
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  ^ Top   #48  
Old 08.03.2008
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No, the taller the ratio the more torque you need, the lower the ratio like 3.55s the less torque you need. 3.36s will give you more top speed and allow you to turn lower rpms at a higher speed, thats what a DD15 needs.

On a side note, man if you want advice from a bunch of guys on a internet forum about trucks, then you shouldnt own any piece of equipment. You have been very lucky with 0 mechanical knowledge. Dont trust your hard earned money to someone who might be clueless about what they are talking about, this aint $100 were talking $100K
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  ^ Top   #49  
Old 08.23.2008
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Quote:
Originally Posted by 550hpW900L View Post
No, the taller the ratio the more torque you need, the lower the ratio like 3.55s the less torque you need. 3.36s will give you more top speed and allow you to turn lower rpms at a higher speed, thats what a DD15 needs.

On a side note, man if you want advice from a bunch of guys on a internet forum about trucks, then you shouldnt own any piece of equipment. You have been very lucky with 0 mechanical knowledge. Dont trust your hard earned money to someone who might be clueless about what they are talking about, this aint $100 were talking $100K
Salco...this guy knows a lot about what he's talking. I went through the same discussion with the Freightliner guys before I bought 2 Cascadias with DD15s. You will be please with the DD15's low end torque. I made the mistake and went with the wrong ratio.....

If your drivers tend to want to downshit too early, go with a 3.42.....if they can keep patient while climbing a hill and let the DD15 do its job, they will do great with a 3.36 or even lower (numberically). The fuel economy is good on our DD15s @3.58....but outstanding on the one our company bought @3.36...outstanding.

I would seriously consider the dual torque versions as well.
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  ^ Top   #50  
Old 08.28.2008
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WELL PERSONALLY BRO I GOT CATS,CUMMINS,AND DETROIT~AND HAD A FEW MERCEDES ENGINES IF U WANT SOMETHING TO LAST 500K GET A DETROIT~ U SHOULD BE ABLE TO DO A INFRAME ON UR FREIGHTLINER FOR CLOSE 10K BUT IF UR GONNA BUY NEW GO CAT THERE GOOD FOR A MILLION BEFORE U NEED AN INFRAME ~ ANYWAY STAY AWAY FROM THE VOLVOS NOTHIN BUT TROUBLE ~IF U LIKE FREIGHTLINER GO WITH THE CASCADIA~
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