I'm using the Cummins X15 as an example, but this could apply to any engine. Since the X15 has several different horsepower and torque ratings, are there different engines for each of these, or is it the same engine just tuned differently? Like is a 525hp with 1850 fp torque the same engine as the 600 hp with 2050 fp torque? What about an engine with hp in the 400s compared to the 600hp? I hope I'm making sense here.
Cummins X15 horsepower ratings
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Life on Wheels, Aug 31, 2021.
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While engine displacement is the same, different HP ratings do contain different internals, such as pistons, cams, injectors and so on. This holds true for Cummins and I would imagine most other current engine manufacturers. The days of flashing software to increase HP and torque ratings are for the most part over.
Ssgtkevin, Oxbow, Trucker61016 and 3 others Thank this. -
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Why is it that peak torque is achieved at 1100 rpm all the way to 1800 rpm. It just shoots up and levels out flat through the whole rpm range. They are going to level it off like that through "hardware"?
It's software that keeps the motor from blowing apart before the warranty is over.Trucker61016 Thanks this. -
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They aren't going to build a special nerfed x15 to do what an x13 does, too much production/parts cost. An X15 is an X15. A DD15 is a DD15. They build them the same and tune them with software.Trucker61016 and Willmann30 Thank this. -
When Detriot came out with the DD15 it was giving peope "whiplash" with how much torque it has. Driver were really impressed. But then piston rods started breaking so they had to turn them down. It is still the same basic motor now. -
I know cummins has Different cpl numbers or arrangements.
The C-15 cats were available with as low as 335hp I think up to 550. Lower hp models had all aluminum pistons I believe. Wide variety of injector sizesOxbow, spsauerland and Goodysnap Thank this. -
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It's too many parts to produce and for dealers or parts dealers to stock. I'm sure there is an exemption to over bored bearings from rebuilds.
An X15 that does 430 HP is the same motor that will do 605 HP, they just tune it differently with software.Trucker61016 Thanks this.
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