I think Cummings has an online calculator to find what puts you in the right rpm range with what gear, trans and tire size. If not I'm sure fuller Easton does.
Gear Ratio change for fuel savings.
Discussion in 'Car Hauler and Auto Carrier Trucking Forum' started by bmercer, Jul 13, 2017.
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What are the savings in mpg you are looking for
bmercer Thanks this. -
I don"t think its going to happen with this truck.
I ran 115 miles today bobtail an got 7.6 @ 1600 rpm and 65 mph.
I going to do the same run tomorrow @ 1400 rpm.
That will put me at 58 mph. -
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http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf
You will also need the Horse Power & Torque curve chart for your Particular Engine to do It Properlybmercer Thanks this. -
I had a 2006 Century with a 450 Mercedes. It originally had 3.58 rears on 11R22.5 . It was a real dog. I switched jobs and went from 5 axle 80,000 lbs to 8 axle 140,000 lbs super-b and changed the rear ratios to 4.11 at a cost of $5,000.
Later I went back to dry van and the truck picked up almost a full 1 mpg. I guess that Mercedes liked to spin faster then I was told. 1,500 rpm at 100 kph (62.5 mph). I could do 70 mph but it killed the fuel economy drastically. But it was still a bit of a dog.bmercer Thanks this. -
sxdime Thanks this.
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Remember, that even 5 car is going to be no where near as aero as a box van.bmercer Thanks this. -
It got 8.2. At this point I'm thinking only 6/10's mpg, it's probably not worth the effort to put any money in it especially not knowing the out come. -
Are you running tall or short 24.5's?
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