Forum Discussion
4x4ord wrote:
cummins2014 wrote:
Wow 5000 RPM with a diesel , I'm sure that 6.7 Cummins would have pistons thru the block at that RPM . :B
5000 rpm for a Cummins might be pushing it ... I don't know? I wasn't overly concerned to see that level of rpm for 12 miles with my Duramax.
with the eb engaged the dmax will shut off fuel flow and let the engine rev to near 5,000 if needed. no issue. friction losses go up as the cube of rpm so rpm helps slow you down in this case.
On early dmax the tach had a "redline" at just above 3Krpm, but apparently that caused enough confusion with grade brake operation that by 2015 the tach no longer has a redline.
rpm limit under power is just above 3Krpm.cummins2014 wrote:
Wow 5000 RPM with a diesel , I'm sure that 6.7 Cummins would have pistons thru the block at that RPM . :B
5000 rpm for a Cummins might be pushing it ... I don't know? I wasn't overly concerned to see that level of rpm for 12 miles with my Duramax.Grit dog wrote:
The range between the 7.3 and Dmax will be about the same since in general the difference in efficiency is about the same as the difference in tank size.
But I don’t understand the reason for the apples vs oranges comparison.
The most important reason is I don't need the towing capability of a diesel, the additional expense or the need to mess w DEF, but the range a dmax provides would overcome the 12 gallon smaller tank.
It's pretzel logic on my part, I realize, that's intertwined w my preference for GM over Ford and gas(in my application) over diesel.- The range between the 7.3 and Dmax will be about the same since in general the difference in efficiency is about the same as the difference in tank size.
But I don’t understand the reason for the apples vs oranges comparison. ktmrfs wrote:
cptqueeg wrote:
What is an approximate range of a CC LWB F350 w 7.3 gasser (48gal) vs the 3500 w duramax (36 gal) with a load of 3000lbs (pop-up TC, people, gear)?
(The truck would be stored all winter in an unheated garage so a gasser would avoid frozen DEF.)
DEF freezing is not an issue. Long exposure to high temps while stored is a bigger issue. All DEF vehicles have a heater to thaw the DEF
As for range our CC Duramax 2015.5 4x4 easily averages 18+ unloaded. pulling a 6500 lb cargo trailer 12-13 so your configuration would be somewhere in between for us. Pulling a 10K TT, 10-12
Thanks, should have added 4x4 to my description.rhagfo wrote:
cptqueeg wrote:
Does 12 gallons more fuel (and a local Ford dealer) make it worth buying a Ford for a long time GM fan?
We like the lonely stretches of NV a lot.
Well 12 gallon difference 36 vs 48 gallon.If it is fuel capacity one just needs a Ram!
Well current Rams have as large as a 55 gallon tank, but I am talking real fuel capacity like 170 gallons!! I just wonder how this would have sold if Ram actually put into production!
Ram Long Hauler
That was a good out of the box thinking project truck built on a 5500 chassis, but I don't think Ram would have sold enough to justify producing it and I think Ram realized that. Not sure what market that was intended for but most hotshotters drive 3500/350 DRW trucks.cptqueeg wrote:
What is an approximate range of a CC LWB F350 w 7.3 gasser (48gal) vs the 3500 w duramax (36 gal) with a load of 3000lbs (pop-up TC, people, gear)?
(The truck would be stored all winter in an unheated garage so a gasser would avoid frozen DEF.)
DEF freezing is not an issue. Long exposure to high temps while stored is a bigger issue. All DEF vehicles have a heater to thaw the DEF
As for range our CC Duramax 2015.5 4x4 easily averages 18+ unloaded. pulling a 6500 lb cargo trailer 12-13 so your configuration would be somewhere in between for us. Pulling a 10K TT, 10-124x4ord wrote:
cummins2014 wrote:
Probably not towing the weight some are , my fifth wheel is only 15,500 GVWR , around 14,500 loaded these days . But the Cummins gets the job done nicely up ,and down the grades here in the mountain west .
An EB is nice to have for a 14000 lb trailer but not absolutely necessary for most highway grades. I remember descending a very long 8% grade with 14000 lbs in tow in the days before the factory EBs were available. My 03 Duramax at that time held the trailer back with zero brake applications at 5000 rpm in 1st gear. I used a 2011 Powerstroke on that same hill pulling the same 14000 lb trailer. The 2011 Powerstroke had a poor EB but it was good enough to comfortably descend the mountain in 2 nd gear at about 3500 rpm without any brake applications.
I have towed those same grades with the same weight with a 99 Superduty 7.3 Powerstroke with no EB, and no it was not a pleasant experience, going up or down . There is one coming down into Virgina City , MT that 14K or 20K is sure nice to have a decent EB . You don't see many runaway ramps , that hill has one , its not for the faint of heart towing heavy ,and just a two lane road . Sure I got by without EB as many did in years past, but I was careful , low speeds ,and gears . Those days are gone now , I let that Ram do it's thing .
Wow 5000 RPM with a diesel , I'm sure that 6.7 Cummins would have pistons thru the block at that RPM . :B- What is an approximate range of a CC LWB F350 w 7.3 gasser (48gal) vs the 3500 w duramax (36 gal) with a load of 3000lbs (pop-up TC, people, gear)?
(The truck would be stored all winter in an unheated garage so a gasser would avoid frozen DEF.) cummins2014 wrote:
Probably not towing the weight some are , my fifth wheel is only 15,500 GVWR , around 14,500 loaded these days . But the Cummins gets the job done nicely up ,and down the grades here in the mountain west .
An EB is nice to have for a 14000 lb trailer but not absolutely necessary for most highway grades. I remember descending a very long 8% grade with 14000 lbs in tow in the days before the factory EBs were available. My 03 Duramax at that time held the trailer back with zero brake applications at 5000 rpm in 1st gear. I used a 2011 Powerstroke on that same hill pulling the same 14000 lb trailer. The 2011 Powerstroke had a poor EB but it was good enough to comfortably descend the mountain in 2 nd gear at about 3500 rpm without any brake applications.
