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Old 08-30-2015, 08:25 AM   #85
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I drive my dodge 6.7 with 6 speed auto, in 6th down the road, 92000 miles and no problems
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Old 08-30-2015, 08:58 AM   #86
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My 2012 Cummins will shift down automatically when necessary. Peak torque is 1,650 rpm. If I see a significant hill coming up, I will downshift to 5th to make things easier on the engine. I drive the Cummins manually shifting the transmission to keep the engine rpms above 1,400 all time when moving.

I monitor the EGT, transmission oil temperature, rear differential oil temperature and the water temperature and will downshift and or reduce speed on long inclines.
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Old 08-30-2015, 09:25 AM   #87
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Quote:
Originally Posted by KJRitchie View Post
Having switched from a gas Tundra to a Ram 2500 CTD Iive noticed quite a bit a difference in throttle response and acellerator travel compared to my Tundra 5.7L. I've only got about 600 miles on the new truck. I did a short tow yesterday with tow haul engaged and noticed when going up hills I kept pressing down the acellerator and the transmission seemed to stay in the same gear. With the Tundra it would shift right away. Guess I still need to get use to the difference.
Does everyone lock out 6 th gear when towing on hilly terrain with diesel?

Kelvin
Nope - I never fiddle with manually overriding the tranny. I leave it in Tow/Haul, exhaust brake on Auto and usually with the cruise control on. Boogie's right on up the mountain regardless of what speed I set.

The newer Ram diesels do not have a hair trigger throttle response but they are pulling monsters. They will get you up steep grades with a minimum of drama at any speed, but don't except to chirp the tires when you stand on it. All of the current diesel pickups have some degree of electronic power management to prevent ripping the drivetrain apart with 800-900 ft/lbs of torque.

Not downshifting all the time and running @ 4000 RPM going up hill is partly why I love towing with a diesel. It isn't going to behave like a 1/2 ton gas truck.
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Old 08-31-2015, 12:36 PM   #88
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All my driving so far has been solo in my 2015 Ram 2500 CTD. I've driven it to work a few days, took a day trip out to a local lake and took my wife for a drive in it to a friends BBZ. The terrain around here has a lot of short hills. I notice when the truck encounters one of these short but steep hills while going 60 mph it looses speed quite fast, maybe due to the high curb weight. I apply a little throttle like I would on my previous Tundra but the speed keeps bleeding off. With more accelerator applied finally the speed stabilizes and then picks up. At times the rpms get around 1000 rpm and pressing on the throttle a bit you can feel a little vibration, like the engine needs to be I a lower gear. I've played with the +/- column shifter buttons and if I press the "-" button I can change the gear selection display to show what gear it is in even if 6 is not locked out. I'm going start to observing what gear the engine is using while driving on this undulating terrain at speeds around 60 mph to get a feel of how this is working. Maybe I should lock out 6 when on this terrain.

I guess I'm still not used to a diesel engine and its characteristics.

Kelvin
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Old 08-31-2015, 08:43 PM   #89
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The newer Dodge diesels have a computer-controlled transmission and they don't "feel" the same as the old ones. The mechanic at the dealership who services me mentioned that many of the old-time drivers seem to be uncomfortable with this, but that "mama knows best" in that the computer makes all the decisions.

I know that when I drive our VW Passat with the Tiptronic transmission I dislike the fact that it does not respond immediately to my stomping on the accelerator. On the other hand, my 1999 Dodge Ram 2500HD diesel, which has the 4-speed auto tranny responds instantaneously.
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Old 08-31-2015, 09:02 PM   #90
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Two diesel questions.......

Quote:
Originally Posted by KJRitchie View Post
All my driving so far has been solo in my 2015 Ram 2500 CTD. I've driven it to work a few days, took a day trip out to a local lake and took my wife for a drive in it to a friends BBZ. The terrain around here has a lot of short hills. I notice when the truck encounters one of these short but steep hills while going 60 mph it looses speed quite fast, maybe due to the high curb weight. I apply a little throttle like I would on my previous Tundra but the speed keeps bleeding off. With more accelerator applied finally the speed stabilizes and then picks up. At times the rpms get around 1000 rpm and pressing on the throttle a bit you can feel a little vibration, like the engine needs to be I a lower gear. I've played with the +/- column shifter buttons and if I press the "-" button I can change the gear selection display to show what gear it is in even if 6 is not locked out. I'm going start to observing what gear the engine is using while driving on this undulating terrain at speeds around 60 mph to get a feel of how this is working. Maybe I should lock out 6 when on this terrain.

I guess I'm still not used to a diesel engine and its characteristics.

Kelvin

Your new trucks transmission is still learning your driving habits.So drive it like you plan on using it.Don't baby it or it will adapt to that driving style.
Put some miles on it.

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Old 08-31-2015, 09:17 PM   #91
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Geeze, 1,650 RPMs? That's low...
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Old 08-31-2015, 09:55 PM   #92
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One "tip"'I learned about climbing a hill. Add juuuuuuust enough throttle to maintain the speed. If running 65 then don't "catch" the deceleration in time, I add enough power to "stabilize/hold" the speed. Sometime I do t get power up in time and I will drop to say, 55. I just hold and let it "granny"'to the top. I then keep that "power setting" until near my cruising speed downhill. No"pumping / oscillating the throttle. The "puter" seems to like that behavior, yielding stable MPG.

NOW, if I run "cruise", I get lots of fluctuations in speed and MPG.
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Old 08-31-2015, 10:48 PM   #93
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When I drove it to the lake, about 40 miles away on a dived highway with 65mph limit, I set the cruise control to test it and it was able to maintain 65 mph within a coupe of mph on the hills and felt very smooth. The average mpg display creeped up and going down the hills the transmission would shift down to maintain 65 mph. It did better than my right foot.

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Old 09-01-2015, 10:01 AM   #94
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The break-in mileage before towing is in the user manual. Towing too soon can create issues as the rings and bearings are still getting settled.

I changed gears manually to exercise the Cummins through my typical working range of 1,450 to 2,250 rpm. Driving at a constant rpm on a new engine is not a good break-in procedure.

Letting the engine rpm drop below 1,450 lugs the engine. I select 3rd for the 30s, 4th for the 40s, 5th for the 50s and 6th around 55.
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Old 09-01-2015, 08:28 PM   #95
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A Diesel engine is not lugging at low rpm.They produce massive amounts of torque even at idle speed.It is the opposite of a gas engine.


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Old 09-01-2015, 09:17 PM   #96
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The cat engine in my kenworth now has 1.4 million miles, the computer shows from 1100 to 1550 rpm's, always grossing close to 100,000 lbs.I even let the dodge pull down to 1000 rpm, mostly run at 1550 rpm, they are built to run this way, the computer adjusts the timing,and the amount of fuel....
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Old 09-01-2015, 10:02 PM   #97
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ThedCummins diesel supplement states:
ENGINE BREAK-IN RECOMMENDATIONS
The diesel engine does not require a break-in period due to its construction. Normal operation is allowed, provid- ing the following recommendations are followed:
• Warm up the engine before placing it under load.
• Do not operate the engine at idle for prolonged
periods.
• Use the appropriate transmission gear to prevent engine lugging.
• Observe vehicle oil pressure and temperature indica- tors.
• Check the coolant and oil levels frequently.
• Vary throttle position at highway speeds when carry- ing or towing significant weight.
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Old 09-01-2015, 10:39 PM   #98
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Two diesel questions.......

Quote:
Originally Posted by KJRitchie View Post
ThedCummins diesel supplement states:
ENGINE BREAK-IN RECOMMENDATIONS
The diesel engine does not require a break-in period due to its construction. Normal operation is allowed, provid- ing the following recommendations are followed:
Warm up the engine before placing it under load.
Do not operate the engine at idle for prolonged
periods.
Use the appropriate transmission gear to prevent engine lugging.
Observe vehicle oil pressure and temperature indica- tors.
Check the coolant and oil levels frequently.
Vary throttle position at highway speeds when carry- ing or towing significant weight.

This supplement is provided for both manual and automatic transmission.Your computer controlled automatic will not allow lugging.
As I mentioned above don't baby it drive it like you would normally drive as the transmission learns as time goes by.Its like a marriage u both have to get used to each other.Lol

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