Comparison of Jeep vs. Ram Ecodiesel engines (charts)

[hayasa]

I'm coming from a 2015 Grand Cherokee Ecodiesel so was wondering about all the upgrades they made with the Gen 3 engine (compared to my Gen 2). Noticed that the Gen 3 Jeep engine and Gen 2 Jeep engines have roughly the same TQ, so got me thinking about where the extra TQs are lost compared to the Gen 3 Ram Ecodiesel. Heard about all the changes they made to shoe-horn the engine into the Gladiator engine bay to include moving things around to maintain water crossing depth, stacking the intercooler next to the radiator (unlike the Ram 1500 which has the intercooler below the radiator in its own cooling air stream), etc., but really wanted to see the overall differences. Found the below charts that map out the Gen 2 and 3 Ram 1500 engines and the Gen 3 Jeep engines. Interesting that big differences happen roughly between the 1500 and 2500 rpm band - looks like the top of the Jeep's curve was sliced off to keep it at the 442 range across that band while the Ram's just curves up and into the 480 range. Thinking this is very likely a tuning issue and maybe some extra juice left on the table that might be recovered by an aftermarket tuner once those start hitting the market. Also shows how they both end up with the same HP rating since the charts overlap pretty closely after that torque bump and both peak at 260hp.

Ram 1500 Gen 2 and Gen 3:

Jeep Gen 3:

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[WXman]

Yeah it's probably in the tuning. My assumption is that Jeep limited the diesel by nearly 40 lb/ft on purpose due to cooling needs. The small engine bay makes it hard to keep engines cool while working, which is also why the 2.0L I-4 isn't offered in the JT. I'm sure they were concerned about cooling with the diesel as well, hence, capping output well short of the Ram application where there's tons of room for cooling.

 

[TheSolarWizard]

Yeah it's probably in the tuning. My assumption is that Jeep limited the diesel by nearly 40 lb/ft on purpose due to cooling needs. The small engine bay makes it hard to keep engines cool while working, which is also why the 2.0L I-4 isn't offered in the JT. I'm sure they were concerned about cooling with the diesel as well, hence, capping output well short of the Ram application where there's tons of room for cooling.

I don’t think it’s the engine compartment size so much as the lack of a separate source of air for the inter cooler like the ram has.
as far as the 2.0L I don’t think it’s rated to tow over 3500lbs on any platform on which it’s offered.

my guess is that either the current eTorque 3.6 in the JL will become a full hybrid here, or that I - 6 that keeps sneaking past a whisper will become the hybrid option here

 

[WXman]

I don’t think it’s the engine compartment size so much as the lack of a separate source of air for the inter cooler like the ram has.
as far as the 2.0L I don’t think it’s rated to tow over 3500lbs on any platform on which it’s offered.

Right, and that's specifically because of cooling. Mark Allen and the team said so on numerous occasions during the JT launch. They can't meet engineering design needs for cooling with that engine in the small Jeep engine bay. They opened up the grille on JT to get more cooling and barely made the Pentastar work. But the 2.0 still wouldn't stay cool enough.

I'm surprised they shoe-horned the diesel into that engine bay at all. So it's no surprise that the diesel needed to be detuned if it was going to be offered. The lack of space for a better intercooler location is, again, due to the small engine bay.

I can sit on the ground "indian style" with my torso and head up into the engine bay on the Ram. Or I can climb down into the engine bay on my hands and knees and work. It's night and day. TONS of cooling and space. If you pop the hood on the JL EcoDiesel, you can't even see the oil filter, much less any daylight through the crammed engine components.

Most people will never work the Jeep EcoDiesel at its max capacity, but there will be a few people who do and so they've got to keep it cool for worst case scenario.

 

[WXman]

I'd still like to know for sure though if there are any hardware changes for the Jeep version. Different oil pan to accommodate off-road angles? Any internal engine changes?

 

[Josh00333]

I'd still like to know for sure though if there are any hardware changes for the Jeep version. Different oil pan to accommodate off-road angles? Any internal engine changes?

Every thing I have seen is tune, all due to cooling. The Jeep simply dose not have the room/air flow the truck has.

 

[Jeep-A-Kneez]

Well let's just take the engine hood off, I've done got old & fat and need a larger snow sled anyways.

 

[WXman]

Every thing I have seen is tune, all due to cooling. The Jeep simply dose not have the room/air flow the truck has.

That's what I am thinking too. So it'll be interesting to see if aftermarket tunes like the GDE tune for example will bring the JL/JT up to the power levels that match the DT post-tuning, or, will there continue to be a 40 lb/ft difference between the two even after tuning? Will be neat to see!

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