Jeep Renegade All Wheel Drive Systems
There are two all wheel drive systems on Jeep Renegade, one of which is restricted to (and standard on) the Trailhawk model.
The 2015 Jeep Renegade Trailhawk has front tow hooks (in some markets), skid plates, all-terrain tires, and fascias that allow better approach and departure angles; it also has more ground clearance than other Renegades. Renegade Trailhawk has 8.1 inches of wheel articulation.
Jeep Active Drive is the basic AWD system; it uses a power transfer unit (PTU), and has yaw correction, balanced torque distribution, and brake traction control to reduce both understeer and oversteer. The system also uses a fully variable wet clutch for control of rear wheels, moderating torque for slippery roads or performance — unlike Jeep Cherokee, which uses dog clutches. Renegade Trailhawk adds a two-speed power takeoff unit; the low range locks the front and rear drive shafts and adds a 4.334:1 gear reduction for a “crawl ratio” of 20.1:1. The system also adds (but only in low range) Hill Descent Control and Hill Ascent Control, to automatically control the speed, from a user-selectable 1 mph to 5 mph, using the throttle and brakes. When in low gear, stability control is shut off entirely.
The AWD systems both use the driver-selectable Selec-Terrain traction control system, which controls the powertrain, drivetrain, and brake computers, and stability control.
•Standard mode is automatic, staying in front wheel drive most of the time, but splitting torque as needed.
•Sport limits traction control, increases stability-control thresholds, and targets a front/rear torque split of 40/60 for a rear-drive feel.
•Snow starts in second gear, sets brake controls for slick surfaces, and goes into full time 4x4, preferring a 60/40 front/rear split.
•Mud/Sand is similar but has modified brake controls, and prefers rear wheel drive.
•Rock, on Trailhawk only (because it is only available in low gear), is similar to Mud/Sand but increases brake lock differential capacity, and locks the differential.
Jeep Renegade Powertrain: Transmission and Engines
The 948TE automatic transmission, built by Chrysler using a modified ZF design, has a stunning 9.81 ratio spread, with a low first gear and a tall top gear; the wide ratio spread delivers an aggressive first gear ratio of 4.71 for low-end performance and small gear ratio steps which provide smooth transitions, while the overdrive comes in at 0.48:1. Renegade TrailHawk adds a rock-crawl ratio of 20:1 by using a 4.334:1 final drive with the 4.71:1 first gear. This transmission has Electronic Range Select, so drivers can limit the highest gear it will go into.
The system can dynamically choose from over twenty shift maps for specific conditions, choosing based on engine characteristics, longitudinal and lateral acceleration, grade changes, temperature, speed, and electronic stability control demands. (ZF actually allows for many more shift maps, but so far Chrysler has not taken them up on it; Cherokee has 40 shift maps available, still just a fraction of the total allowed by ZF.)
North Americans can choose between the Fiat 1.4 Turbo and Chrysler TigerShark 2.4 four, both coupled to the nine-speed automatic standard. The 1.4 turbo has more power outside North America, along with a stop/start system.
The rest of the world can get the a variety of engines, though most are only available with front wheel drive:
•1.6 liter EtorQ (based on Chrysler Tritec), 108 hp, 112 lb-ft, with start/stop system; front wheel drive, five-speed manual only.
•1.4 liter MultiAir engine with 138 hp/170 lb-ft with stop/start system, manual six-speed transmission, and front wheel drive.
•1.6 liter MultiJet II diesel with Stop/Start system (Europe only), six-speed manual, and front wheel drive; 118 hp, 236 lb-ft
•2.0 liter MultiJet II diesel with Stop/Start system (Europe/Asia-Pacifica) with AWD only, and nine-speed automatic or six-speed manual; 103 or 125 kW output with 258 lb-ft of torque.
You can read a whole lot more on this new Jeep here:
http://www.allpar.com/SUVs/jeep/renegade.html