Many Jeep owners run their vehicles off-road, where repair facilities and fuel stations are non-existent. The same platform was also available with a 3. And today, every Jeep available in Europe can be optioned with a diesel engine, including the contemporary Renegade, Wrangler, and Cherokee. While our shores have been relatively bereft of Jeep diesel options, there have been a few notable domestic-market production models, as listed below. Which is your favorite?
Close Ad. Join MotorTrend. Jeep redid the cylinder head intake ports, made the exhaust gas recirculation EGR system into dual loop low and high pressure system, and slapped new pistons into the cylinders, reducing the compression ratio from Finally, it features a new variable-geometry turbocharger.
It should be noted that, in , the EPA filed a civil complaint against FCA alleging the company used defeat devices on approximately , Ram and Jeep Grand Cherokee vehicles with diesel engines. The case was settled in January of FCA also implemented a program to mitigate excess pollution from these vehicles. The total cost to FCA for all of this was over half a billion dollars. The diesel engine gets its own heavier-duty transmission, a ZF 8HP75 eight-speed automatic—the only available gearbox.
That transmission has the same gear ratios as the one used with gasoline engines, and it is in the same family of ZF transmissions as the RE in other Wranglers. Similarly to the gasoline-engine units, two part-time transfer cases are available on the diesel Wranglers. The Command-Trac NV is part-time two-speed transfer case with a 2.
The 2. The addition of the Selec-Trac Full-Time 4WD System replaces the front axle universal joints with constant-velocity joints to make turning smoother. Diesel-powered Wranglers are geared differently than other Wranglers. Gasoline-powered Rubicons have 4. The diesel Rubicons, of course, have locking differentials front and rear, whereas others have limited-slip rear diffs.
All of this gearing goodness is housed within Dana 44 axles—M in the front and M in the rear. EcoDiesel models and all Rubicons have axles that are 1. Another change from the gasoline version of the Wrangler is evident in the exhaust system.
The thick pipe, at least 2. It seems buried toward the back of the V-shaped engine and meanders along the passenger side of the vehicle, while a huge catalytic converter with Selective Catalytic Reduction runs alongside the transmission. The SCR operates at higher temperatures than a conventional gasoline catalytic converter. Therefore, the dual-loop Exhaust Gas Recirculation system which recirculates a portion of the exhaust gases back to the engine, reducing Nitrogen Oxides NOx emissions runs at higher temperatures, too.
An EGR cooler had to be installed to reduce the temperature of those exhaust gases before they get recirculated back into the engine air intake system. Based on earlier spy photos , the diesel will be identifiable by a "3. The diesel comes standard with an engine start-stop system, and the eight-speed automatic transmission is a new unit that is set up to deal with the engine's increased torque output.
As with all other Wrangler models, four-wheel drive is standard on the diesel, and there are multiple transfer-case and differential configurations available for various levels of off-road capability. EPA fuel-economy ratings are not yet available for the Wrangler EcoDiesel, but we expect it to offer significantly improved efficiency compared to the turbocharged 2. Jeep will release more information about the Wrangler EcoDiesel over the next few months before it goes on sale by the end of No, you would not.
Around town, the Ecodiesel supports big-rig fantasies. There's no manual gearbox, but there's a certain amount of joy that comes from locking the ZF-sourced eight-speed automatic into a high gear and standing on the accelerator.
As the turbo spools up, its whistle drowns out the clatter as the intake gets stuffed with Peak torque arrives at rpm and stays flat all the way to Get out of it and the blow-off valve lets loose with a characteristic whoosh. At the track, this pound Wrangler Unlimited Sahara recorded an impressive 6. The quarter-mile happens in While it isn't the quickest Wrangler we've run through the numbers, the difference is so negligible that it will go unnoticed. Plus, the diesel's off-the-line acceleration never fails to result in a grin.
On the road, the Wrangler drives very much like an off-roader; two live axles and the quickest recirculating-ball-steering gear available in a Wrangler at On the skidpad, there's a meager 0.
To compensate for this ute's additional pounds over a similarly equipped V-6 model , Jeep increased the front and rear spring rates by 10 percent and added diesel-specific dampers, making the ride noticeably firmer. The huskier Wrangler also needed feet to stop from 70 mph. That's 22 more than the gasser Sahara V In the dirt, the diesel-powered Rubicon model earns its stripes.
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