Technical Specifications
| Brand | Jeep |
| Model | Grand Cherokee |
| Generation | Grand Cherokee IV (WK2) |
| Type (Engine) | SRT8 6.4 V8 (477 Hp) 4×4 Automatic |
| Start of production | 2011 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 19.6 l/100 km (12 US mpg, 14.4 UK mpg, 5.1 km/l) |
| Fuel consumption (extra urban) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg, 7.6 km/l) |
| Fuel consumption (combined) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5 sec |
| Acceleration 0 – 62 mph | 5 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 257 km/h (159.69 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4.9 kg/Hp, 204.2 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 269.7 Nm/tonne |
| Power | 477 Hp @ 6000 rpm |
| Power per litre | 74.3 Hp/l |
| Torque | 630 Nm @ 4300 rpm (464.66 lb.-ft. @ 4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | ESG |
| Engine displacement | 6417 cm3 (391.59 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.9 mm (4.09 in.) |
| Piston Stroke | 94.5 mm (3.72 in.) |
| Compression ratio | 10.9:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Coolant | 15.5 l (16.38 US qt | 13.64 UK qt) |
| Kerb Weight | 2336 kg (5150 lbs.) |
| Max. weight | 2948 kg (6499.23 lbs.) |
| Max load | 612 kg (1349.23 lbs.) |
| Fuel tank capacity | 93 l (24.57 US gal | 20.46 UK gal) |
| Permitted trailer load with brakes (12%) | 2269 kg (5002.29 lbs.) |
| Length | 4859 mm (191.3 in.) |
| Width | 1958 mm (77.09 in.) |
| Width including mirrors | 2156 mm (84.88 in.) |
| Height | 1756 mm (69.13 in.) |
| Wheelbase | 2915 mm (114.76 in.) |
| Front track | 1617 mm (63.66 in.) |
| Rear track | 1633 mm (64.29 in.) |
| Ride height (ground clearance) | 211 mm (8.31 in.) |
| Drag coefficient (Cd) | 0.39 |
| Minimum turning circle | 11.3 m (37.07 ft.) |
| Approach angle | 18.45° |
| Departure angle | 21.9° |
| Ramp-over angle | 17.84° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 295/45 R20 |
| Wheel rims size | 20 |
The Jeep Grand Cherokee SRT8, produced between 2011 and 2013, represented the high-performance variant of the fourth-generation Grand Cherokee (WK2). Positioned as the flagship model, it aimed to deliver sports car-like performance within the framework of a luxurious and capable SUV. This particular iteration featured a 6.4-liter HEMI V8 engine paired with a five-speed automatic transmission and a full-time four-wheel-drive system. It served as a direct competitor to performance SUVs from European manufacturers like BMW and Porsche, offering a unique blend of American muscle and off-road capability.
Powertrain & Engine Architecture
The heart of the SRT8 was the 6.4-liter (392 cubic inch) HEMI V8 engine, internally designated as the ESG. This engine was a significant upgrade over the standard Grand Cherokee engines, featuring larger bore and stroke dimensions, strengthened internal components, and a revised cylinder head design. It utilized a multi-port fuel injection system and an overhead valve (OHV) valvetrain. The engine produced 477 horsepower at 6000 rpm and 464.66 lb-ft of torque at 4300 rpm. This power was channeled through a five-speed automatic transmission, specifically the Chrysler 545RFE, known for its durability and ability to handle high torque loads. The transmission was calibrated for performance, with quicker shift points and a more aggressive shift strategy. The four-wheel-drive system was full-time, utilizing an electronic limited-slip differential to distribute power between the front and rear axles, enhancing traction in various conditions.
Driving Characteristics
The SRT8 delivered a markedly different driving experience compared to other Grand Cherokee trims. The substantial power and torque of the 6.4-liter V8 resulted in brisk acceleration – 0-60 mph in around 4.8 seconds. The five-speed automatic transmission, while not as sophisticated as newer eight or nine-speed units, provided smooth and responsive shifts. The gear ratios were optimized for acceleration, but this came at the expense of fuel economy. Compared to the 3.6-liter V6 or the 5.7-liter HEMI V8, the SRT8 offered significantly more power and a more engaging driving experience. However, the increased weight and performance focus resulted in a firmer ride quality and reduced fuel efficiency.
Equipment & Trim Levels
The SRT8 came standard with a comprehensive list of features, reflecting its premium positioning. Interior appointments included performance-oriented seats upholstered in leather and suede, a unique SRT steering wheel, and aluminum pedal covers. Standard technology included a premium audio system, navigation system, and a rearview camera. Optional extras included a dual-pane sunroof, adaptive cruise control, and blind-spot monitoring. The exterior was distinguished by unique SRT badging, a lowered suspension, and 20-inch alloy wheels.
Chassis & Braking
The SRT8 featured a specially tuned suspension system designed to enhance handling and stability. The suspension included stiffer springs, firmer dampers, and larger stabilizer bars compared to other Grand Cherokee models. The braking system was also upgraded, featuring ventilated discs on all four wheels and high-performance brake calipers. The anti-lock braking system (ABS) was standard, providing enhanced stopping power and control. The rear suspension utilized a multi-link design, contributing to improved ride quality and handling.
Market Reception & Comparison
The Jeep Grand Cherokee SRT8 was generally well-received by automotive critics, who praised its powerful engine, sporty handling, and luxurious interior. However, its fuel economy was often criticized, as was the somewhat dated five-speed automatic transmission. Compared to competitors like the BMW X5 M and Porsche Cayenne Turbo, the SRT8 offered a more aggressive and muscular driving experience, but lacked the refinement and technological sophistication of its European rivals. Its price point positioned it competitively within the performance SUV segment.
Legacy
The 6.4-liter HEMI V8 and five-speed automatic transmission combination in the SRT8 has proven to be relatively reliable, with many examples still on the road today. While maintenance costs can be higher than those of the V6 models due to the larger engine and performance components, the powertrain is generally considered durable. On the used car market, the SRT8 commands a premium price compared to other Grand Cherokee trims, reflecting its performance capabilities and exclusivity. It remains a popular choice for enthusiasts seeking a powerful and capable SUV with a distinctly American character.
