Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > 2014+ Jeep Grand Cherokee Ecodiesel 3.0

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 01-05-2014, 01:50 PM
Member
 
Join Date: Jun 2013
Location: Washington
Posts: 253
Thanks: 0
Thanked 24 Times in 17 Posts
Rep Power: 1221
crabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond repute
Whats your take on the trans with this diesel?

Up front I'm very pleased with this drive train and I'm curious about others impressions of it including which modes they are using (eco on/off, sport) and why. I suspect that those sitting on the fence would be perusing a thread like this so a couple things... Please wait to post till you have had sufficient time to have a handle on the drive train. By that I mean you have enough miles to have a feel for it in most situations as well as have taken a position on which modes you like and when you use them. When you discuss the modes you use please explain why. Also we're different people with different viewpoints and this isn't a quiz with a right and a wrong answer. Because we are talking about our impressions there is no argument being made and no argument is needed.

For bottom line skip to last paragraph.

I'll start with the general side. As I said I'm stoked with this drive train, a home run. I've had a number of diesels over the years but this is my first pairing of modern 8 speed with a modern diesel. It is the combination of the two that carry the ball over the fence IMO.

I'll begin with eco since the car defaults to it. I find that the car is relentless in its desire to upshift to higher gears and hold gears longer in eco. Too much so in my opinion. I also think the shift programming creates a few problems with the throttle mapping specific to eco mode. First is from a standing start in eco and in a situation where you need to move out smartly such as trying to hit a hole in heavy traffic. It can be quite difficult to do smoothly because the car doesn't really want to go and you keep feeding in throttle until all of a sudden the programming has decided, "hey, this guy REALLY wants to go, lets give him a big throttle input" and you get a sudden excessive surge forward. I'm not talking about turbo lag here although I think that exacerbates the problem. When taken out of eco mode its quite easy to make this speedier than normal launch without the surge. Its something you can learn to drive around but it takes practice and you have to get it just right. You shouldn't have to be skillful to move into traffic. The other time that eco mode often gets caught short is when moving in steady state traffic and you need to accelerate. There is always a reluctance to shift down which you do need in a vehicle that will be in 6th gear at 30 mph steady state on the flat. What happens is you get a delayed response to downshifts and then it hands them out miserly when it does give them to you. I have the feeling of wanting to roll under the truck and bitchslap the trans around while screaming at it "For christs sakes downshift!" lol Its not actually that bad but to me it is quite annoying because it keeps coming over and over. What you end up with is either a surge when the economy nanny finally lets you have your way or a leisurely gathering of speed that doesn't always fit in with traffic situations or what you had in mind. You can also drive around this to some extent with practice and you do get used to it or in my case, not. This would lead me to eco off...

I love eco off, it usually shifts when I think it should and does it well with shifts that are smooth and quick. When accelerating from steady state it grabs what I feel are an appropriate number of gears for the amount of throttle I gave it and does so without hesitation. When it then gets up to speed it quickly moves into gears that are appropriate for that speed. I find the trans matches my desires well with eco off, It gives me quick aggressive shifts when I want them but also smooth nearly imperceptible shifts when slogging along in traffic.

Sport mode is great and I'm glad its there but its mostly an answer to a question I didn't ask. Its not that I don't like to go fast, I have a car specifically for that purpose but in the GC what I'm doing is going to the store, towing my bass boat, etc. For me this vehicle is about day to day getting things done and there is little point to aggressively shifting up and down and holding higher than necessary gears when you are slogging through traffic on the way to the grocery store. I do find one use for it though. When on the freeway the car needs quite a jab of throttle to get some decent acceleration. I have taken to hitting sport in such situations and then it reacts much better. I did play around with driving in eco and then hitting sport whenever I felt it needed it but this didn't work for me. I felt it needed it a lot and with an eco off mode that IMO shifts nearly flawlessly without any intervention it was a method I dropped quickly. One thing that I haven't tried where I think sport mode may be useful is during towing. Maybe others will comment on that.

I'm old and grew up with manuals and I actually like them. I'm not Joe Racer, I just enjoy the interaction with the vehicle. That would be a different car though, I did use manual for a bit and it didn't take much time in figuring out that an 8 speed diesel needs a lot more shifting than a 6 speed diesel does. I do appreciate that this mode is easily accessible in any circumstance via the paddles but I don't see myself using the manual mode and the paddles much except in some towing situations and at the boat launch. I currently have no intention of going off roading and the obvious use of manual mode there will likely go untested by me.

Bottom line on shifting for me is eco is out, I shut it off immediately when I get in. I think eco off is outstanding and the vehicle shifts as well as any I have ever driven in that mode. Sport is fun and cool but it will see little use unless it should turn out it works well in some situations while towing. The manual mode has obvious uses in specific situations and I'm glad it is easily accessible and controllable via the paddles. I feel in general that the 8 speed trans is excellent and acts to make the most of the diesel engine.
__________________

__________________
2014 Diesel Grand Cherokee
Reply With Quote
The Following 3 Users Say Thank You to crabman For This Useful Post:
  #2  
Old 01-05-2014, 03:12 PM
nautiboy's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: Apr 2013
Location: Pacifica, CA
Posts: 401
Thanks: 44
Thanked 112 Times in 60 Posts
Rep Power: 1297
nautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

EDIT: I suppose I should've also included some of the "context" from my earlier review. But in short, I've now had my diesel JGC for 8 weeks, logged about 2K miles, did a mix of commuting, family trip to the Sierras with some snow and offroading, normal errands, sporty driving in the Santa Cruz mountains, etc. So I've had at least a somewhat reasonable amount of time to form an opinion, but it is still somewhat "early" and my views may change as time goes on.

I already covered most of this in my review in the owner's thread, so I'll just quote that portion of my review here:

Quote:
Originally Posted by nautiboy View Post
Powertrain - since the big difference in this thread is the fact that we're talking about diesels, I think it makes sense to start here. Because of the things I do with my SUVs, the V6 didn't seem like it was going to be sufficient. But largely for environmental reasons and to a slightly lesser extent fuel costs I really wasn't very excited about the V8. So when I heard that Jeep was doing a diesel I was sold - the power I need/want, more environmentally friendly, good mileage (for an SUV) and I was expecting/hoping that the big torque down low would be a kick to drive.

Well, so far the EcoDiesel plus the 8-speed shifter has exceeded all of my expectations.

The diesel is quiet - at first I was completely blown away how quiet it was, even standing right next to it. Later I discovered that it gets louder in colder temperatures, so *slightly* less blown away, but still remarkably quiet for a diesel. My friends and passengers generally don't even know it's a diesel until I tell them, at which point they're usually quite shocked. But it does still have some of the diesel sound to it, so anybody that knows what to listen for will know it's a diesel, which personally I like, and I like the "rugged" feel of the sound.

The fact that it's quiet and also runs at lower RPMs than its petrol counterparts, also has the nice side-effect that my Significant Other doesn't realize how fast we're going. I was actually amazed that even climbing the Sierras at 75 it typically stayed in 8th and sometimes 7th gear, just cruisin' on up the mountains barely breaking 2K RPMs. That was with 4 people and a lot of gear too!

Initially I was a bit thrown off by what I assumed was primarily turbo-lag. The worst seemed to be starting from a dead stop. I'd hit the accelerator, not move as much as I'd expect, so give it more throttle and then next thing I know my neck is snapping and the tires are chirping. Later I tried turning off eco mode and also tried sport mode, both of which significantly improved things - there seemed to be very little lag. So I don't think it's all turbo-lag - I think it's a combination of the eco mode mappings and the turbo. Now that I've gotten used to it, it feels fine to me even in eco mode. But there was definitely a little adjustment there in the beginning.

To really try out whether the turbo-lag was going to be an issue for me, I decided to take it out for a run up the twisty mountain road that I frequent on my motorcycle. With a vehicle that high and heavy, there's only so much corner speed you can carry into a turn, which, coupled with being an uphill climb, means you're doing a lot of on/off throttle in somewhat critical-timing situations. I popped it into sport mode and took off. I was quite impressed with how well such a big vehicle was able to hustle through the twisties. The turbo-lag was minimal, the diesel pulled hard and the suspension kept it fairly well planted. After 2+ hours scootin' that big girl's butt around, I practically had to be dragged home. I'd never mistake it for my motorcycle or my TransAm, but for what it is, it sure moved well and was fun to drive.

Just for the fun of it, I tried doing some 0-60 runs with my ScanGauge plugged in to get (relatively) accurate timing. I got a pretty consistent 7.4 seconds. Again, not bad for a big vehicle that can get up to 30MPG.

The 8-speed transmission has been fantastic and flawless. Shifts are very smooth and it seems to make the best use of the area under the power curve. I'm also impressed that it downshifts quite a bit when heading down somewhat steep hills. Most other auto transmissions would just stay in the highest gear if you were coasting down a hill. Nice to get some engine braking in there.

The only downside so far has been getting used to the electronic shifter. In the beginning I had a really hard time hitting the gear I wanted quickly. Over time I've gotten much more proficient and the muscle-memory is starting to build. But I do still miss gears more than I'd like and I do miss the feel of a mechanical shifter. While I was thrilled to see that the engineers consciously made allowances for shifting from Drive-to-Reverse quickly, allowing one to "rock" the vehicle, it's a lot harder (at least for me) to do it with the electronic shifter than a mechanical.

Between the diesel and the 8-speed, I've been getting the mileage I was hoping for. On my 100 mile (round-trip) commute, I used to average roughly 13MPG in my V6 Explorer. I've been averaging 24MPG with the winter blend in the Jeep, which I expect will go higher with summer blends and maybe even a little higher after more breakin. On my trip to Tahoe I averaged 26MPG, which included quite a bit of elevation change, offroading, stop-and-go traffic, idling and cold weather. And again that's on winter blend. The good mileage ended up giving me a "double bonus" on the Tahoe trip. Not only did I get significantly better mileage than my V6 Explorer, but with the huge range I was able to go from SF->Tahoe, drive around a lot and make it back to SF on a single tank which saved me from the large increase in fuel price (usually at least $0.30/gal) that stations around Tahoe charge. I expect that big range will also be quite beneficial in my disaster work.

The one minor blemish on the diesel experience was the dealer. Even armed with information posted here that the dealers were supposed to fill the DEF tank, and even with information showing that Chrysler would reimburse up to 2.5gal of DEF to the dealer, the dealer refused to top up the DEF. I didn't feel like making a big deal over something so small, so I finally let it drop and I went to the auto store, bought some and filled it myself. It seems most other dealers, once made aware of the necessity to fill the DEF, have happily done so. So I think my experience is probably more limited - though the number of dealers that don't seem to know that they're supposed to top it up seems exceedingly high.

Oh, one more blemish is the occasional smell (sometimes referred to as "cat piss"). I'm close to 2K miles now and I still get that occasionally. It seems to happen most often when going from freeway speeds down to stop-and-go. As discussed in another thread, Willx says they think it might be coolant-related and not related to the DEF/diesel-exhaust/etc and that they're looking into it. But I haven't heard anything since then. Hopefully they figure that one out.
But since you specifically asked about the different modes and I didn't elaborate on that a lot in my review, I'll make a few comments here.

In general, as you can tell from my review, I basically agree with your comments. The eco mode plus the turbo seem to play off each other in a negative way so as to give some unexpected behaviors when hitting the throttle, especially from a stop. Eco off and sport mode seem to do a good job of correcting that and are a lot more predictable.

That being said, I eventually got used to the behavior of eco mode on and I don't really think about it much anymore. Muscle memory seems to work just fine and I'm generally fine using eco mode most of the time.

For me, I almost never turn eco mode off. I'm either in eco mode or sport mode. I personally don't find enough of an advantage to eco mode off to bother turning it off each time. If I want some more kick and responsiveness I just slap it into sport mode.

However, the few times my SO has driven the vehicle, I've turned the eco mode off for her because she hasn't driven it enough to adapt to the eco mode.

Anyway, bottom line for me is that I always find a bit of an adjustment driving different vehicles - they all have different throttle/brake characteristics, but the diesel with eco mode on required more adjustment than any other vehicle I've tried (outside of really high performing (sub-11 sec 1/4 mile types)). Is that bad? Well, I keep vehicles a long time, so a short period of adjustment is not an issue for me and as I said - I've adapted and now I'm generally fine with it except those times that I want sport mode. And for "guests" who haven't had the time to adapt, eco mode can be turned off.

So I'm totally fine with how everything is set up and programmed. Though I do wish, as does pretty much everyone else, that the eco mode would retain its previous setting. I think that would put this whole discussion completely to bed because with eco on/off and sport mode, there's really enough options/capabilities to satisfy most every type of driver. But I guess Jeep couldn't do that and claim the MPGs they do and/or comply with CAFE standards. I read in another thread that someone managed to get someone at Chrysler/Jeep to set their computer to keep the last setting, so clearly it's not a programming issue and the capability is there - it must just be a bureaucracy thing.
__________________

__________________
Overland 4x4 EcoDiesel, Deep Cherry/Light Frost, ORA-II, Adv Tech

Reply With Quote
The Following User Says Thank You to nautiboy For This Useful Post:
  #3  
Old 01-05-2014, 03:33 PM
NC4stroker's Avatar
Member
 
Join Date: Dec 2013
Posts: 113
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 486
NC4stroker is on a distinguished road
Re: Whats your take on the trans with this diesel?

With 2400 miles, mostly my wife's miles, I do get what you are saying about eco, though I've logged virtually zero miles off eco.

On eco, it does want to upshift, and smooth starts take some practice for sure. I've asked my wife about it, and she notes no problems, so that is HUGE for me!!!!

With regards to eco, I'm sure after 2400 miles, our GC hasn't logged a total of 25ft in 1st gear!!

I just get in her and do my thing. I try not to over analyze, as that just leads to more analysis, and to a never ending string of "what ifs"!!!!!!!
__________________
2015 GC SRT
2014 GC Overland diesel
2012 Shelby GT500, modded
2012 Ram 2500 Cummins, modded
1986 Jeep CJ-7 Last of the real Jeeps!!
Reply With Quote
  #4  
Old 01-05-2014, 05:06 PM
Member
 
Join Date: Jun 2013
Location: Washington
Posts: 253
Thanks: 0
Thanked 24 Times in 17 Posts
Rep Power: 1221
crabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

lol Guys I for sure don't want to start an eco war. Thats why I said to leave the argument out of it and stick with preferences and why. I'm really a stick guy and I suspect I'm going to be at the far end of the curve in wanting it to shift the way I want it to shift.

About the need for eco to default to off, I'm not certain this situation exists. I have had several cars that had things like stop/start that were used during CAFE certification and were part of that certification but were not defaulted to on. I see no reason why some auto manufacturers can do it but Jeep cant?
__________________
2014 Diesel Grand Cherokee
Reply With Quote
  #5  
Old 01-05-2014, 05:32 PM
NC4stroker's Avatar
Member
 
Join Date: Dec 2013
Posts: 113
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 486
NC4stroker is on a distinguished road
Re: Whats your take on the trans with this diesel?

It would be nice if a tuner would tune the Eco to an "off" default!

P.S. At least we don't have the dreaded transmission "clunk" we had in our 13!!!
__________________
2015 GC SRT
2014 GC Overland diesel
2012 Shelby GT500, modded
2012 Ram 2500 Cummins, modded
1986 Jeep CJ-7 Last of the real Jeeps!!
Reply With Quote
  #6  
Old 01-05-2014, 05:41 PM
nautiboy's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: Apr 2013
Location: Pacifica, CA
Posts: 401
Thanks: 44
Thanked 112 Times in 60 Posts
Rep Power: 1297
nautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond reputenautiboy has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

Quote:
Originally Posted by crabman View Post
lol Guys I for sure don't want to start an eco war. Thats why I said to leave the argument out of it and stick with preferences and why.
I'm confused. I don't see how either of the two responses could be construed as an argument. It seems to me both were exactly what you wanted - preference and why.

Quote:
About the need for eco to default to off, I'm not certain this situation exists. I have had several cars that had things like stop/start that were used during CAFE certification and were part of that certification but were not defaulted to on. I see no reason why some auto manufacturers can do it but Jeep cant?
I have no particular knowledge on this, it was just a complete guess. Since the system is apparently capable of being set to one of: default on, default off, default last (if you know the "right" person at Chrysler/Jeep), clearly Jeep had a reason for choosing default on, and my best guess was that it had something to do with meeting some requirement. Maybe the cars you've seen before weren't 2014s and the standards have changed, or maybe they're "good enough" to meet standards with eco off, or maybe I'm wrong and it has nothing to do with standards. I dunno - I just posited it as a possibility.
__________________
Overland 4x4 EcoDiesel, Deep Cherry/Light Frost, ORA-II, Adv Tech

Reply With Quote
  #7  
Old 01-05-2014, 06:00 PM
Member
 
Join Date: Jun 2013
Location: Washington
Posts: 253
Thanks: 0
Thanked 24 Times in 17 Posts
Rep Power: 1221
crabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond reputecrabman has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

Quote:
Originally Posted by nautiboy View Post
I'm confused. I don't see how either of the two responses could be construed as an argument. It seems to me both were exactly what you wanted - preference and why.



I have no particular knowledge on this, it was just a complete guess. Since the system is apparently capable of being set to one of: default on, default off, default last (if you know the "right" person at Chrysler/Jeep), clearly Jeep had a reason for choosing default on, and my best guess was that it had something to do with meeting some requirement. Maybe the cars you've seen before weren't 2014s and the standards have changed, or maybe they're "good enough" to meet standards with eco off, or maybe I'm wrong and it has nothing to do with standards. I dunno - I just posited it as a possibility.
As to the former, I'm sorry because I worded that poorly, I was pointing out that I, me, had not been trying to start an argument over the eco with my own comments. lol

The latter, I don't know hence the question about it. It seems to me that some people however have been simply assuming that it must be that way for a reason and with little else making sense it was by regulation. But is it? I have a 13 in the driveway with stop/start that was used during both CAFE and EPA certification and it does not default to on so as of the 13 model year such a requirement did not exist for at least that function. It may be that transmission shift points are different and the conventional wisdom is correct. I've no idea. Again I'm wondering, I don't have the answer.
__________________
2014 Diesel Grand Cherokee
Reply With Quote
  #8  
Old 01-05-2014, 07:22 PM
NC4stroker's Avatar
Member
 
Join Date: Dec 2013
Posts: 113
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 486
NC4stroker is on a distinguished road
Re: Whats your take on the trans with this diesel?

Tonight, I turned off the "tree hugger" button, and it did accelerate more smoothly IMO. I'll probably try it some and see how it goes.
__________________
2015 GC SRT
2014 GC Overland diesel
2012 Shelby GT500, modded
2012 Ram 2500 Cummins, modded
1986 Jeep CJ-7 Last of the real Jeeps!!
Reply With Quote
  #9  
Old 01-05-2014, 08:04 PM
Member
 
Join Date: May 2012
Posts: 127
Thanks: 14
Thanked 10 Times in 9 Posts
Rep Power: 1065
200sxr is on a distinguished road
Re: Whats your take on the trans with this diesel?

I have 3 comments about the transmission, apart from these I think it is a great transmission.

1, It holds onto 1st gear for too long when starting from a steep incline (go down)
2, The engine braking while going down a incline is too aggressive
3, It would up-shift to next gear in paddle mode as the engine reaches the usual up-shift engine speed
__________________
Aerodynamics are for people who can't build engines - Enzo Ferrari
Reply With Quote
  #10  
Old 01-05-2014, 08:10 PM
racer-xerols's Avatar
Member
 
Join Date: Dec 2013
Posts: 146
Thanks: 0
Thanked 8 Times in 7 Posts
Rep Power: 529
racer-xerols has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

I'm a stick guy, and I have lots of experience with turbos (gas and diesel), both wastegated and VNT like the Eco. I learned how to drive with the trans in Eco...by the time I made the 45 minute trip home from the dealership. I have zero issues with it.

I also live on top of a mountain, with a 17 mile twisty road between home and work. Typically I commute on a motorcycle, but with single digit temps...even I bag the bike and get in a cage. My Cummins is a stick and gets driven accordingly. My 92 Cherokee is a 4 speed auto, and out of habit I take it out of overdrive going up the hill so it isn't "hunting" for a gear. The WK2 doesn't "hunt"...but it is a bit more entertaining to give the shifter a pull back into S mode (which turns off Eco). I have also used S in stop-and-go traffic, for a bit more engine braking (similar to my old '05 Cummins' "tow-haul" mode, which had a much more aggressive downshift/engine brake pattern in its automatic). But in 2200 miles....I'd say I've done less than 30 miles outside of Eco.

If I want to go fast, I have motorcycles.

If I need to tow, I have the Cummins.

If I want comfort...I have the WK2.

And my take on why Eco defaults "on" is...marketing. They want to be able to hit that MPG claim, and by making us push a button to make it a thirsty truck...they do just that.
__________________
Reply With Quote
  #11  
Old 01-06-2014, 12:17 AM
FAUEE's Avatar
Member
My Jeep: 2011 5.7L WK2
 
Join Date: Feb 2012
Location: Hickory, NC
Posts: 941
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 4690
FAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond reputeFAUEE has a reputation beyond repute
Re: Whats your take on the trans with this diesel?

The ECO button defaulting to on is for EPA testing. If it defaults to on, they don't turn it off for the testing. If it defaults to off or what was last set, they don't turn it on for testing.

I recently test drove an Ecodiesel Overland (was really wanting to test a Ram with the engine, but alas those don't exist yet). It's a good engine, the 8 speed definitely works with it (I don't think it would work as well with the Hemi tbh). The combo really moves it around town nicely, and it gets out of its own way well too. Not a particularly nice sounding engine, but you can't really hear it with the stereo on.

It's a very good powertrain for people who want the feeling of effortless acceleration, but don't care about performance. When you stomp on it, it doesn't give you that satisfying jerk and thrust my old Hemi did. But it does get out of its own way once the turbo is spooled up, and never feels lacking for power.

It shifts a lot. I mean a lot a lot. This is to be expected with the diesel, it doesn't rev nearly as high as a gas engine. The shifts aren't anything special IMO, Eco or not. It shifts about as fast as the 6 speed in my old one did, which is to say, not super racecar fast, but not super long either.

Overall, it's a great powertrain, with crappy pricing. If it were the same price as the Hemi, it'd be great. But being significantly more than the Hemi, you can buy a lot of gas for that money. Truthfully, I suspect they priced it this way to try to keep demand low initially, I think they may have supply issues with the Ram coming up. I expect the diesel's price will fall in the next model year or two once they have better idea about what production numbers they'll see.
__________________
Reply With Quote
  #12  
Old 01-06-2014, 12:28 AM
talltale's Avatar
Member
My Jeep: 1947 2.4L CJ
 
Join Date: Aug 2013
Posts: 109
Thanks: 12
Thanked 20 Times in 13 Posts
Rep Power: 606
talltale is on a distinguished road
Re: Whats your take on the trans with this diesel?

Okay, I now have 5400 miles on my CRD. I just completed a 3500 mile trip which involved just about every driving situation to include towing a 6600 lb trailer. My impressions follow:

Heavy traffic/combat urban driving: I ended up turning ECO mode off. Urban assault driving requires aggressive throttle, instant response, and quick maneuvering. ECO mode just wasn't cutting it. (did I mention I hate city driving and urban drivers)

Off-Road driving: Gearing is appropriate to the situation, upshifts are smooth. I find myself using the paddle shifter for steep downhill grades to take advantage of engine braking. Again, ECO mode is off for anything approaching aggressive terrain.

Cross-country highway driving: ECO mode on. No gear hunting. Passing is a blast (downshifts are quick and engine response immediate)

Snow and Ice: starting in 2nd gear works great. ECO mode is off in snow mode. Shift programming seems the same as Auto mode, but works well.

Towing a heavy load: ECO mode off. Transmission adjusted gear shifts to keep engine in the best torque range. Even under a heavy load shifts were buttery smooth. Transmission oil temp pretty much stayed at 195 F +/- 5 F with an OAT of around 60 F. No gear hunting. For long 6% downhill grades I used the paddle shifters to take advantage of engine braking.

My overall impression is this transmission is well matched to the diesel. I like the flexibility the paddle shifters, ECO mode, and sport mode give me.
__________________

__________________
Ordered 8/12/13. Production Scheduled 8/15/13. Produced 9/28/13. Delivered 11/25/13. Overland 4x4 CRD, Deep Cherry Red/Brown Light Frost, ORA-II, Adv Tech.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is the JGC Diesel instrument panel cluster configurable like the RAM diesel? f1anatic 2014+ Jeep Grand Cherokee Ecodiesel 3.0 5 12-29-2013 02:26 PM
CRD diesel mpg= 26 hwy, does the Green Diesel tune increase this? KKielisch Liberty-KJ and KK 5 10-14-2013 08:08 PM
"Diesel fürs Dickschiff" ( "Diesel for the big boat") BobT Export Grand Cherokee 2011+ 11 01-30-2013 08:15 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 11:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.