SRW for pulling Fifth Wheel
I am looking to buy a new truck because we intend to upgrade to a fifth wheel within the next few years. I have read a ton of articles and posts saying that a dually is better and the truck to have. P...
Forum Discussion
Hannibal wrote:ShinerBock wrote:
Stock 2003 Cummins made 235 hp if it was an auto and 305 hp if it was a manual HO. The 5.4L in the Super Duty made 300 hp at 5,000 rpm. 3800-4200 is more than the 30% higher rpm you stated earlier. Lastly, I have towed 5-7k with a 5.4L SD and I don't remember it ever being below 4500 up hills. Maybe on flat ground, but not on hills.
The 235hp was California. Mine was 250hp. That was peaked at 2900rpm where it was starting to run out of breath. The 310hp 5.4L makes 287hp at 4200rpm. That's right at peak torque rpm where it's just starting to come alive. The 2010 lowly 5.4L out tows the 2003 SO Cummins.
Again, the math of your 30% more rpm statement does not add up. The 3800-4200 you posted is more than 30% above the diesel. This is going by your own statements. Peak horsepower of the 300 hp version of the 5.4L in the SD was at 5,000 rpm and peak torque was at 3,750 rpm, not 4,200.
