CM2350 factory file comparrisons...

[shaun_leonard]

(12-14-2022 )Waterloo Wrote:  

(12-14-2022 )shaun_leonard Wrote:  Hello I have a 2015 T660 with an isx12 2350 all emissions in tact. Powerspec shows it has EF10015.38 CPL 3711. EF10028.21 is was parts.cummins shows. Can I turn it up to at least 450hp. Currently it's supposed to be set at 425hp from a Cummins shop calibration. They would not go any higher. Has a 10 speed with 4.33 rears.

Are you sure on those 4:33 gear ratios? Is this T660 a vocational truck, like a dump truck? Just curious, as that number, with that body, seems a bit odd.

It's a sleeper truck. It's a weird setup but that's what it came with from factory. Tags on the diff and tag on the door both say 4.33. I can only run 65 if I want to keep rpms under 1700 rpms. I plan to change them out someday for 3.90 or 3.70s . I get about 9.5 mpg with an empty 57ft drop deck. When I loaded with hay up to 88k lbs at times I get 5.5 to 6 mpg.