Thanks to all you guys for your replies. Sorry to be so late in replying, been on the road for the last 3 days. I have an 08 2500HD with a 6.0L and 6 speed trany. Guess I had better run in 4th at 2700rpm for the best performance. Thanks;
All else being equal...a gasoline engine is more fuel efficient at low RPM (lower friction and fewer power strokes) and larger throttle openings (reduced pumping losses against a closed throttle).
I'm not an engineer either but I am a member of the SAE.
J Gerber wrote: Thanks to all you guys for your replies. Sorry to be so late in replying, been on the road for the last 3 days. I have an 08 2500HD with a 6.0L and 6 speed trany. Guess I had better run in 4th at 2700rpm for the best performance. Thanks;
best performance ?? If it towing performance it will change with terrain/load/outside ambient temps/altitude/lower or higher octane gas/etc. As you tow with the same rig you will gain experience in determining which rpm works best for the truck for that particular load. Long flat stretches with a 30-35 mph tailwind your going to find 2700 rpm is a waste of fuel. We see that quite often in western TX/OK/KS/NB. Turn around and face that 30-35 mph head wind and 2700 rpm won't do it with a tall heavy load.
Jim
'03 2500 Dodge/Cummins HO 3.73 6 speed manual Jacobs
'97 Park Avanue 28' with two slides
Offline
