The rear steering angle varies up to + / - 3.0 degrees, according to vehicle speed and driving mode selected: at low speeds the rear -
axle steering angle is opposite to that of the front wheels (counter-phase steering), effectively shortening the wheelbase up to 600 mm for increased agility and a reduced turning circle for increased maneuverability.
At high speeds the rear
axle steering angle is in the same direction as the front wheels (in - phase steering), elongating the wheelbase up to 600 mm for increased stability and ride comfort as well as optimum driving dynamics.
Not exact matches
There's four - wheel drive with a twin - clutch rear diff that offers a proper torque vectoring system that takes into account throttle position,
steering angle and road surface when distributing power across the rear
axle and for the GSi it features a unique set of calibrations.
But as more engine torque is called upon by the driver, the Haldex's electronic brain does the math by registering
axle loads, tire slip and
steering angle, then commands the fast - acting electro - hydraulic center differential to continuously vary torque distribution to enhance rear traction with a torque split that is biased to the rear wheels by as much as 100 percent.
The rear
axle steering system AKC ® changes the rear wheels» toe
angle in such a way that a
steering function ensues.
GENERAL Vehicle / model: ’17 Jeep Grand Cherokee Trailhawk 4x4 Base price: $ 43,095 Price as tested: $ 53,515 Options as tested: Customer Preferred Package 28J ($ 2,695), Jeep Active Safety Group ($ 1,495), 5.7 L Hemi V - 8 ($ 3,295), Rock Rails ($ 895), Uconnect 8.4 NAV ($ 450), Blind Spot and Cross Path Detection ($ 595), Destination Charge ($ 995) ENGINE Type: Chrysler 16 - valve V - 8 Displacement (ci / liter): 345/5.7 Bore x stroke (in): 3.92 x3.58 Compression ratio -LRB-: 1): 10.5 Intake / FI: Naturally aspirated, sequential multi-port electronic Mfg.'s power rating @ rpm (hp): 360 @ 5,150 Mfg.'s torque rating @ rpm (lb - ft): 390 @ 4,250 Mfg.'s suggested fuel type: Midrange unleaded recommended; regular unleaded acceptable DRIVETRAIN Transmission: ZF 845RE 8 - spd automatic Ratios -LRB-: 1): First 4.71 Second 3.14 Third 2.11 Fourth 1.67 Fifth 1.29 Sixth 1.00 Seventh 0.84 Eighth 0.67 Reverse 3.30
Axle ratio -LRB-: 1): 3.09 Transfer case: MP 3022 2 - spd Low - range ratio -LRB-: 1): 2.72 Crawl ratio -LRB-: 1): 39.6 FRAME / BODY Frame: Steel unibody Body: Steel SUSPENSION /
AXLES Front: Short - and long - arm independent, coil springs, twin - tube coilover shocks, steel upper - and aluminum lower - control arms, stabilizer bar / ZF 7.7 - in Rear: Multi-link, coil springs, twin - tube shocks (with load leveling for towing), aluminum lower control arm, independent upper links plus a separate toe link, stabilizer bar / ZF 7.7 - in
STEERING Type: Electric rack - and - pinion Turns (lock - to - lock): 3.2 Ratio -LRB-: 1): 16.7 BRAKES Front: 13.8x1.3 - in vented disc, two - piston caliper Rear: 13.0x0.9 - in vented disc, single - piston caliper ABS: Four - wheel WHEELS / TIRES Wheels (in): 18x8.0 Tires: P265 / 60R18 Goodyear Wrangler All - Terrain Adventure with Kevlar FUEL ECONOMY EPA city / highway: 14/22 Observed city / highway / trail: 15.7 DIMENSIONS / CAPACITIES Weight (lb): 5,154 Wheelbase (in): 114.8 Overall length (in): 189.8 Overall width (in): 76.5 (84.8 w / mirrors) Height (in): 69.3 Track f / r (in): 63.9 / 64.1 Minimum ground clearance (in): 8.2 (standard height), 10.4 (suspension position # 2) Turning diameter, curb - to - curb (ft): 37.1 Approach / departure
angles (deg): 26.2 (standard height) 36.1 (suspension position # 2, air dam off) / 24.0 (standard suspension), 27.1 (air suspension position # 2) Breakover
angle (deg): 18.2 (standard height), 22.8 (suspension position # 2) GVWR (lb): 6,800 Payload (lb): 1,190 Maximum towing capacity (lb): 7,200 Seating: 5 Fuel capacity (gal): 24.6 PERFORMANCE 0 - 60 mph (sec): 7.3 Quarter - mile (sec @ mph): 15.6 @ 90.9 Braking 60 - 0 mph (ft): 132.8 Ramp Travel Index (20 - deg, points): 375
IDD is an innovative system that manages torque split by sending all power to the rear
axle in normal driving until it predicts, based on sensor data such as yaw rate,
steering wheel
angle and lateral acceleration that torque should be diverted to the front
axle.
Active rear -
axle steering turns up to 1.5 degrees of toe
angle for increased cornering response and high - speed stability.
The all - wheel - drive system works quickly and intelligently and its control unit constantly calculates the ideal driving torque for the rear
axle — based on the data from the engine, ABS / ESC sensors and
steering wheel
angle sensor.
Dimensions Length without rear wing: 4,980 mm Width without mirrors: 2,046 mm Width with mirrors: 2,224 mm Height: 1,212 mm (variable) Wheelbase: 2,880 mm Engine Model: V8 engine with BMW TwinPower Turbo Technology Capacity: 3,981 cc Number of cylinders: 8 V
angle: 90 ° Bore: 89 mm Stroke: 80 mm Cylinder spacing: 98 mm Engine speed: approx. 7,000 rpm Body • Composite body with carbon core and DMSB - approved safety roll cage • CFRP outer shell with quick - change concept Chassis • Double wishbones on front and rear
axle • Four - way adjustable shock absorbers at front and rear • Anti-roll bars with quick adjustment Power Transmission • Six - speed sequential motorsport gearbox • Electric paddle shift system • Limited slip differential • CFRP drive shaft • Sachs carbon - fibre clutch Electronics • BMW Motorsport in - house developed software functions for engine, gearbox and driver assistance •
Steering wheel with 16 buttons and seven dials • Rear - view camera system with object recognition • High - performance headlights with OSRAM LED elements • Live telemetry system for vehicle monitoring Wheels / Tyres • BMW Aero rims: 12.5 x18 inch on the front
axle, 13x18 inch on the rear
axle • Michelin tyres: 30/68 R18 on the front
axle, 31/71 R18 on the rear
axle
It comprises two electro - mechanical actuators at both sides of the rear
axle (instead of conventional control arms) that allow the
steering angle of the rear wheels to be varied by up to about 1.5 degrees.
Because it has a power source on each
axle, the i8 is all - wheel drive, with computers monitoring the
steering angle and throttle pressure, and adjusting output at each
axle for torque vectoring.
It is specially adapted to integrate with the active Lamborghini Rear - wheel
Steering (LRS) on the rear axle: two separate actuators react in five milliseconds to driver's steering movements, allowing a real - time angle and cornering stiffness adj
Steering (LRS) on the rear
axle: two separate actuators react in five milliseconds to driver's
steering movements, allowing a real - time angle and cornering stiffness adj
steering movements, allowing a real - time
angle and cornering stiffness adjustment.
QUICK SPECS Vehicle / model: ’14 Jeep Cherokee Base price: $ 29,495 (Trailhawk) Engine (s): 2.4 - liter Tigershark I - 4, 3.2 - liter Pentastar V - 6 Rated hp / torque (lb - ft): 184/171 (2.4 - liter), 271/239 (3.2 - liter) Transmission: ZF 948TE 9 - spd Transfer case: N / A 4WD system (s): Full - time w / active on - demand clutch, selectable rear locker w / Active Drive Lock Low - range ratio: 2.92:1 Frame type: Steel uniframe Suspension, f / r: McPherson strut, long - travel coil springs, one - piece aluminum subframe, aluminum lower control arms, stabilizer bar / Four - link w / trailing arm, aluminum lateral links, isolated steel cradle, coil springs, stabilizer bar
Axles, f / r: 10.4 - in, two - spd PTU / 9.7 - in two - spd RDM w / selectable electronic locker
Axle ratio (s): 4.083:1 (2.4 - liter), 3.517:1 (3.2 - liter w / trailer tow) Max crawl ratio (s): 56:1 (2.4 - liter), 47.8:1 (3.2 - liter)
Steering: Electric - power, rack - and - pinion Brakes, f / r: 13x1.1 - in vented disc, twin - piston floating caliper / 12.6 x0.47 - in solid disc, single - piston floating caliper disc Wheels (in): 17x7.5 Tires: P245 / 65R17 Firestone Destination A / T Wheelbase (in): 107 Length (in): 182 Height (in): 67.8 Base curb weight (lb): 4,106 Approach / departure
angles (deg): 29.9 / 22.9 Minimum ground clearance (in): 8.7 Payload (lb): 1,000 Interior cargo volume (cu ft): 49.47 Max towing capacity (lb): 4,500 Fuel capacity (gal): 15.9 Fuel economy (mpg): TBD
The SH - AWD ® ECU also monitors
steering angle, lateral G - forces, vehicle yaw rate and electromagnetic clutch engagement for the right and left rear
axle shafts.
The AWD ECU also monitors
steering angle,
steering angle rate of change, lateral G - forces, vehicle yaw rate and hydraulic clutch pressure for the right and left rear
axle shafts.
Up to 90 per cent of torque can be dedicated to the front or rear
axle if necessary, which the system determines by continually monitoring information on the
steering angle, speed, yaw, and other sensors.
Quick Specs (as tested) Vehicle / model: ’19 Ram 1500 Rebel Crew Cab Base price: $ 47,495 Engine (s): 5.7 L Hemi V - 8 Rated hp / torque (lb - ft): 395/410 Transmission (s): TorqueFlite 8HP75 8 - spd auto Transfer case (s): BorgWarner 48 - 12 4WD system (s): 2 - Hi, 4 - Hi, neutral, 4 - Lo Low - range ratio: 2.64:1 Frame type: Ladder Suspension, f / r: Upper and lower A-arms, air springs / five - link with track bar, air springs, stabilizer bar
Axle ratio (s): 3.92:1 Max crawl ratio (s): 48.7:1
Steering: Power - assisted rack - and - pinion Brakes, f / r: 14.9 - in vented disc, 2 - piston caliper / 14.8 - in disc, single - piston caliper Wheels (in): 18x8 Tires: LT275 / 70R18E Wheelbase (in): 144.6 Length (in): 232.9 Height (in): 77.6 Width (in): 82.1 Base curb weight (lb): 5,302 Approach / departure
angles (deg): 26.7 / 23.8 (raised suspension) Minimum ground clearance (in): 10.3 (raised suspension) Payload (lb): 1,800 Max towing capacity (lb): 11,530 Fuel capacity (gal): 33.0 Fuel economy (EPA mpg, combined city / hwy / trail): N / A
The optional real -
axle steering its some tricky voodoo, with the rear wheels turning slightly in place in relation to your speed and the
angle of the front wheels.
Aspiration: Sequential MPFI Mfr's max hp @ rpm: 300 @ 5,000 Mfr's max torque (lb - ft) @ rpm: 365 @ 3,750 Transmission: 6R six - speed automatic OD Transfer case: ControlTrac part - time two - speed Low range ratio: 2.64:1
Axle ratio: 3.73:1 (optional) Crawl ratio: 41.06:1 Suspension, f / r: Double - wishbone IFS, short and long arms, coilover shocks / IRS, five - link, coilover shocks
Steering: Power rack - and - pinion Brakes, f / r: 13.5 - inch discs / 13.2 - inch discs Wheels, tires: 17x8 aluminum, P265 / 70R17 off - road OWLs Wheelbase (in): 131.0 Length (in): 221.3 Width (in): 78.8 Height (in): 77.7 Track, f / r (in): 67.0 / 67.2 Curb weight (lb): 5,825 Minimum ground clearance (in): 8.7 Approach / departure
angle (deg): 23.1 / 24.1 Max towing capacity (lb): 8,750 Max GVWR (lb): 7,600 Fuel capacity (gal): 33.5 EPA mileage estimates, city / highway (mpg): N / A Seating capacity: 8
Special sensors measure eleven vehicle elements including vehicle speed, Lateral acceleration speed,
steering angle speed, demand torque, estimate torque, engine rpm, brake oil pressure, normal acceleration (front
axle and rear
axle), ABS anti-lock braking behaviour and vehicle stop information.
To stave off rotation at autobahn speeds, 1.5 degrees of
steering angle is available, replicating a 27.5 - inch stretch between the
axles.
As function of road speed, this unique
steering influences steering forces by way of Servotronic and the steering angle by means of the Active Steering Transmission on the fro
steering influences
steering forces by way of Servotronic and the steering angle by means of the Active Steering Transmission on the fro
steering forces by way of Servotronic and the
steering angle by means of the Active Steering Transmission on the fro
steering angle by means of the Active
Steering Transmission on the fro
Steering Transmission on the front
axle.
Vehicle / model: 2008 Dodge Dakota TRX4 Base price: $ 30,390 Engine: 4.7 L SOHC 16 - valve SMPI V - 8 Max hp & torque (lb - ft): 302/329 Transmission (s): 5 - 45RFE five - speed automatic Transfer case (s): NV233HD (part time), NV244HD (full - time) Low range ratio: 2.72:1 Frame type: Ladder Suspension f / r: Independent, upper and lower A-arms, coil springs over gas - pressure shock absorbers, link - type stabilizer bar / Live
axle, multileaf two - stage longitudinal springs, staggered gas - pressure shock absorbers Ring - and - pinion: 3.92:1 Max crawl ratio: 32:1
Steering: Power rack - and - pinion Brakes f / r: 12.3 x1.1 vented rotor, dual - piston sliding caliper / 11.6 x2.28 drum Wheels: 16x8 aluminum Tires: P265 / 70R16 OWL Rugged Trail Wheelbase (in): 131.3 Length (in): 218.5 Height (in): 68.7 Base curb weight (lb): 4,782 Approach / departure
angles (deg): 21.9 / 22.6 Minimum ground clearance (in): 7.9 GVWR (lb): 6,010 Max cargo volume (cu.
Each
axle has several suspension spheres that are controlled by data (vertical bodywork movement,
angle of
steering wheel and vehicle speed) picked by sensors and sent to a computer.
As such, the
steering angle at the front and rear
axle can be adjusted independently of each other.
The SH - AWD ® ECU also monitors
steering angle, lateral g - forces, vehicle yaw rate and electromagnetic clutch engagement for the right and left rear
axle shafts.