Talked to Cummins

[Sherman]

I spent about a 1/2 hour on the phone with a Cummins ser rep discussing towing heavy with the stock 5. 9 and with a 15000-16000# GN trailer. In regards to lugging,any SUSTAINED rpm below the max torque is considered lugging,in the case of my 04 it would be below 1400 rpm. The recommended cruise rpm is 1650 to 1900rpm,torque is what pulls the tr not hp,in order to get the good mpg # keep the rpm down. We also went through a complicated formula to work load and rpm # to figure out mpg at different load and rpm #. Very interesting. I was trying to figure out the economical gain of a US Gear aux box and through the formula determined that the potential yield would be . 5 to 1 mpg. Other topics where discussed, but the point is, call Cummins with your tech questions,the person I had on the phone is an engineer for the CO and was very helpful with the techy questions.

 

[Dean Upson]

A good friend of mine (Casey Balvert) put me onto this: http://www.powerspec.cummins.com/site/home/ Pretty interesting.



Dean

 

[SnoKing]

Well that really supported the 4:10's I have in my 2001. 5. Says to put above 1900 for the ISB. SNOKING

 

[Hohn]

Originally posted by Sherman

... The recommended cruise rpm is 1650 to 1900rpm,torque is what pulls the tr not hp,in order to get the good mpg # keep the rpm down...

YES YES! TQ IS what pulls the trailer. Not HP. HP is how fast you can pull the trailer. TQ determines how big a hill you can pull. HP is how fast you can pull it...



justin

 

[jandtjil]

Originally posted by Dean Upson

A good friend of mine (Casey Balvert) put me onto this: http://www.powerspec.cummins.com/site/home/ Pretty interesting. Dean

Thanks for sharing!



JJ

 

[AKAMAC]

Originally posted by jandtjil

Thanks for sharing!



JJ

Soooo cool. I liked the maintence interval on oil.....



Duty Factor . 5 - Very Severe 1. 0 - Severe 1. 5 - Moderate 2. 0 - Light

Distance 6,000 miles 9,000 miles 12,000 miles 15,000 miles

Time 250 hours 250 hours 500 hours 500 hours

Fuel Consumed 2,000 gallons 2,000 gallons 2,000 gallons 2,000 gallons