Anybody drive. DD13 engine how do they perform on hills and how are they on mpg. Looking at a 450 hp DD13 with 3.42 rear
DD13 vs 15
Discussion in 'Ask An Owner Operator' started by JohnsonWayTrucking, Dec 28, 2020.
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They do very good all around and hold up better than the DD 15.
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BackwoodsGA and kenn2632 Thank this.
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From what i've heard from others that own them, says dd13 has more torque than the dd15.
BackwoodsGA Thanks this. -
A small block Chevy can make the same horsepower and in some cases the same torque as a big block. But the big block has a wider torque curve and lower horsepower peak so it’s more drivable in more circumstances . The dd13 can be had with more torque but it’s at a higher rpm and a tighter curve.. there’s a reason they promote it as a regional engine (flatland) imo PS the two trucks we have with a dd13 that are set at max torque are not popular in The Rockies so boss went back to dd15 only.
singlescrewshaker and baha Thank this. -
singlescrewshaker Thanks this.
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singlescrewshaker and Tug Toy Thank this.
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I run Colorado regularly (I live there) often above 80,000#, and my only complaint would be about the Jake needing to be a touch stouter.
I don't know if the 15 does it to the same level, but the 13 does start pulling back the boost level at higher rpms at higher altitude. By the time I hit the top of Loveland at almost 12,000', anything above ~1400 rpm will only give 80-85% power. It will still make almost 100% power below that rpm. The rpm where the boost is pulled back varies based on density altitude, so it's more of an issue in the summer. I've learned to just pull up power level on the DataStar and adjust shift points down as needed.singlescrewshaker, Tug Toy and stwik Thank this. -
12000 ft...
I believe the highest hill in Massachusetts is Mt Greylock, about 3500'
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