550 2050 torque on dyno

We have a 2012 122SD with the ISX 600/1850 and I have ran it back and forth with my older Freightliner with a Cat. I can say my old 550 Cat made that new Cummins look stupid. I lost just over 10 kph on every hill compared to the Cat. Same trans, gear ratios and tire size. Only thing that impresses me about them is the engine brake. They still have everyone beat there. But I haven't driven an MP10 Mack? I heard they have a lot of engine braking.
Our new 505/1650 Detroit is only 5 KPH behind the Cummins and can stay close to it.

 

I was only illustrating how they probably came up with the 440 to the wheels.

However, since we're on the subject. I get how it might take a fixed amount of HP to turn the driveline but it stands reason there would be more losses due to heat in the bigger hp I would think. 20%? Probably not for a simple ECM up rate but as mentioned, of you're specing a heavier drive line sure.

 

Sounds like typical OEM BS to me, they never want to own up to their motors not working right if it costs them anything.
IMO, the old N14 red tops and CATS would out pull most all of the newer "higher rated" modern motors. I think allot of these high rated modern motors are just a smoke screen.
OP, I'd look into aftermarket engine tuning if I were you....

 

I can't disagree with that. I think my old 1986 425 Cat will hang right with our 2008 475 ISX. If it wasn't for me having to get out of the pedal due to EGT and water temp I am sure I could smoke that ISX.

 

Same thing here. We've got a mix of ISX's in our newer trucks (1 at 500, 2 at 525, 4 at 450 with allisons behind, yuck), and one old T800 with a 4CK 425 Cat. Oddly enough, the old goat will hang right with the 500 in most places.

The newer motor's ratings are suspect, to me. Also, the emissions systems on Cummins seem to have an odd habit of picking a good hard pull to pop the EGR open. Very irritating.

 

Oscar i often enjoy reading your comments as i think you are one of the good guys on here, not arguing but maybe you will see what im saying if i putnit this way. 2 trucks that have same driveline but different engines 1 truck has a 400 hp engine and other has a 500hp engine, now if we use 20% as an accurate loss that means the 400hp engine would only lose 80hp yet the 500hp engine would lose 100hp. the 20% number is just a guideline to determine loss, a number that brings us close to actual loss. however parasitic loss is on average 80hp, whether its a 350 cummins or a 625 Cat, at some point the % figure doesnt match if we simply say 20%.

 

Not on a new Cummins, but I know the Pittsburgh Power box works WAY better on a Cat than the Bullydog does. Pitts got better power and fuel mileage.

I can't help but think they would be a bad thing on the new motors with a DPF though?

 

It takes advanced timing to gain fuel mileage over the current standard factory programming, no way a signal modifier that comes after the ecm can advance timing, this is what the PP box does. Your experience with the BD which actually rewrites programming is the first I have heard.