I've probably towed right up there for heaviest loads. 29.5k gross. Mountains in Montana and Idaho so some pretty serious grades. 1375 is the highest I've seen. 3rd gear 55ish 7% grade. Typically I can hold 4th up a 6% at 65ish runs around 1300.

Hope that helps!

 

I've probably towed right up there for heaviest loads. 29.5k gross. Mountains in Montana and Idaho so some pretty serious grades. 1375 is the highest I've seen. 3rd gear 55ish 7% grade. Typically I can hold 4th up a 6% at 65ish runs around 1300.

Hope that helps!

Thanks
Sounds like I can expect some improvement over the LBZ.

 

I don't know how GM did it, but the increase in HP and TQ didn't change the cylinder pressure, stress, and temperatures from the LMM. I guess better injectors and more efficient air. When people start to do tuning on these new Rigs, it should be very impressive. stronger tans, pistons, rods, output shaft, fueling, front end, and etc... These new trucks are a great platform to start with and I was impressed with my LMM.

 

A big help is that the extra fuel no longer needs to be injected in the cyl for regen for the DPF, rather it is handled by the injector downstream in the exhaust. Plus with the Piezo injectors you can have 5 or so injection events, thus there is more combustion control (noise/peak cyl temp and press), and at higher pressure (29K) so it is more efficient which can equate to more power with the same amount of fuel.

 

Same fueling system, don't see a lot more power coming from the new motor with a tune, we would need a new turbo that flows some air and a bigger fuel system, the stock CP3 gets maxed pretty easy...