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  #11  
Old 09-03-2013, 09:50 AM
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They have been using the same Diesel engine in Grand Cherokee for a while now overseas. Very few complaints... I was following a Grand Cherokee thread for 6 months before deciding that for a little extra money and similar MPG I can get a truck.
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  #12  
Old 09-03-2013, 11:46 AM
Driver72 Driver72 is offline
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Quote:
Originally Posted by GTyankee View Post
I am almost tempted to factory order a RAM 1500 w/ the 3.0 ECO DIESEL & 8 speed

i wonder how it would hold up to 75 - 80 MPH for 10 to 12 hours a day & for several days running

Like a week ago Monday, i drove 813 miles at those speeds, the 5.7L handled it quite well

Well Diesels are long distance and long running champs.

BUT, nearly every diesel I've ever been in or have owned (only 1) they don't seem to like speeds over 70-75 mph.
70 mph seems to be the ideal "cruising" speeds for diesels.
You can stretch it to 75, but seems after that they start to rev a bit too much and don't sound super comfortable....and their mpg starts to severly drop after 70 or so mph too.

Nowadays with 70-75 mph speed limits (even 80+ in some areas) you need to be able to go 75-80 mph just to keep up with traffic, and that's still remaining in the slow lane. I don't often drive long distances on the freeway, but 70% of my driving is often freeway driving of 15-25 miles each direction and though traffic normally is going 70-75 mph anyway (speed limits of 60-70 mph in those areas), it still feels weird to feel like you are pushing the diesel when you do have to go 75 mph.
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  #13  
Old 09-03-2013, 05:43 PM
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Quote:
Originally Posted by Driver72 View Post
Well Diesels are long distance and long running champs.

BUT, nearly every diesel I've ever been in or have owned (only 1) they don't seem to like speeds over 70-75 mph.
70 mph seems to be the ideal "cruising" speeds for diesels.
You can stretch it to 75, but seems after that they start to rev a bit too much and don't sound super comfortable....and their mpg starts to severly drop after 70 or so mph too.

Nowadays with 70-75 mph speed limits (even 80+ in some areas) you need to be able to go 75-80 mph just to keep up with traffic, and that's still remaining in the slow lane. I don't often drive long distances on the freeway, but 70% of my driving is often freeway driving of 15-25 miles each direction and though traffic normally is going 70-75 mph anyway (speed limits of 60-70 mph in those areas), it still feels weird to feel like you are pushing the diesel when you do have to go 75 mph.
Doesn't have anything to do with vehicle speed. Has everything to do with engine speed. With the right gearing, a diesel will be happy at 85mph all day long.
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  #14  
Old 09-03-2013, 07:02 PM
MountnBear MountnBear is offline
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That's why the new diesel engine in the 1500 is an 8 speed, right? Should be able to handle 75+ in 8th gear.
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  #15  
Old 09-03-2013, 07:35 PM
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Quote:
Originally Posted by MountnBear View Post
That's why the new diesel engine in the 1500 is an 8 speed, right? Should be able to handle 75+ in 8th gear.
Yes, it has the 8hp70 (torque flight 8) behind it. 2 overdrive gears, 0.84:1 and 0.67:1 respectively.

With those trans ratios and a 3.55 rear end, the engine will be at 2124 rpm for 85 mph. Not bad at all. With 3.21 rear ratio, you drop down to 1920 rpm at 85.

I plan on running a 33" tall tire with a 3.92 gear and should be just below 2000 rpm at 70, but I would take the steeper gear ratio for higher towing capacity. My old 2500, after I removed the dpf, would get 21mpg unloaded with the cruise set at 65mph. That slow a speed gets boring after a while though.
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  #16  
Old 09-03-2013, 08:05 PM
Driver72 Driver72 is offline
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Quote:
Originally Posted by randomid25 View Post
Doesn't have anything to do with vehicle speed. Has everything to do with engine speed. With the right gearing, a diesel will be happy at 85mph all day long.
This is true, but as I stated, I haven't been in or owned a diesel that had gearing tall enough to be happy at 85 mph.
They all seem to have gearing that makes them happiest at 70-75.

And my current diesel is a German made car, intended for autobahn blasting.
I've had it into triple digit speeds on the open road a couple times for brief periods, and it seemed fine, but it's definitely not a relaxed drive at that speed.
You seem to be able to hear and feel a "change" in engine note around 75 mph where prior to that, at 70 mph you basically can't even hear or feel the engine.
I've know a couple people with diesels too and they have all said the same.
BMW's diesel may be an exception.

In the 5500-6000 lbs Ram with a small 3.0 liter V6, pushing that heavy truck with a large front through the wind with only 240 hp, i'm guessing the 3.55 will be a needed axle ratio for acceptable acceleration and towing power, but may have that diesel engine humming a bit at 75+ mph.
Get a 3.92 in there and I am even more sure that little 3.0 diesel pushing that heavy truck will be humming along at 75+ mph.

I've been in Ford's big diesel 2500's and Dodge's Cummins and both were also most comfortable at 70-75 mph, and they have a much better power and torque weight ratio than the 1500 RAM will have with the 240 hp 420 tq 3.0 liter.

Time will tell.
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  #17  
Old 09-03-2013, 10:42 PM
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Quote:
Originally Posted by Driver72 View Post
This is true, but as I stated, I haven't been in or owned a diesel that had gearing tall enough to be happy at 85 mph.
They all seem to have gearing that makes them happiest at 70-75.

And my current diesel is a German made car, intended for autobahn blasting.
I've had it into triple digit speeds on the open road a couple times for brief periods, and it seemed fine, but it's definitely not a relaxed drive at that speed.
You seem to be able to hear and feel a "change" in engine note around 75 mph where prior to that, at 70 mph you basically can't even hear or feel the engine.
I've know a couple people with diesels too and they have all said the same.
BMW's diesel may be an exception.

In the 5500-6000 lbs Ram with a small 3.0 liter V6, pushing that heavy truck with a large front through the wind with only 240 hp, i'm guessing the 3.55 will be a needed axle ratio for acceptable acceleration and towing power, but may have that diesel engine humming a bit at 75+ mph.
Get a 3.92 in there and I am even more sure that little 3.0 diesel pushing that heavy truck will be humming along at 75+ mph.

I've been in Ford's big diesel 2500's and Dodge's Cummins and both were also most comfortable at 70-75 mph, and they have a much better power and torque weight ratio than the 1500 RAM will have with the 240 hp 420 tq 3.0 liter.

Time will tell.
I know exactly what you mean. My cummins truck sounded completely different at 80 than at 70 (you could barely hear it). Aerodynamics of a full size truck really come into play at 70 plus mph. My truck got 1.5 to 2.0 mpg less in winter. Part of that being winter fuel, but part of it was pushing denser, colder air out of it's way at speed.

I guess what I'm getting at is that the diesel could be equipped to be a faster highway cruiser, but the best fuel economy won't be achieved at that speed. That's no different than any gasser trucks I've owned.

Last edited by randomid25; 09-03-2013 at 10:44 PM.
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  #18  
Old 09-03-2013, 11:32 PM
maw262 maw262 is offline
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you can build the 2014 ram 1500 with diesel on the ram website if you change the 13 to a 14 in the URL. See below:

http://www.ramtrucks.com/hostc/bmo/CUT201413/models.do?

I only see the 3.55 available for the diesel.
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  #19  
Old 09-04-2013, 12:25 AM
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randomid25 randomid25 is offline
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Quote:
Originally Posted by maw262 View Post
you can build the 2014 ram 1500 with diesel on the ram website if you change the 13 to a 14 in the URL. See below:

http://www.ramtrucks.com/hostc/bmo/CUT201413/models.do?

I only see the 3.55 available for the diesel.
I built a big horn package 4x4 truck with a 3.92 gear. It wouldn't let me build a 3.92 gear truck in SLT trim.
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  #20  
Old 09-04-2013, 08:28 PM
country-boy country-boy is offline
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Quote:
Originally Posted by randomid25 View Post
I know exactly what you mean. My cummins truck sounded completely different at 80 than at 70 (you could barely hear it). Aerodynamics of a full size truck really come into play at 70 plus mph. My truck got 1.5 to 2.0 mpg less in winter. Part of that being winter fuel, but part of it was pushing denser, colder air out of it's way at speed.

I guess what I'm getting at is that the diesel could be equipped to be a faster highway cruiser, but the best fuel economy won't be achieved at that speed. That's no different than any gasser trucks I've owned.
The denser winter air is causing you up to 2 mpg? Wow, that means out west guys should see at least 10+ mpg difference between the deserts and mountains. I hadn't heard it reported quite that high.....
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