Jeep Grand Cherokee 6.4 V8 Hemi SRT Horsepower

Jeep Grand Cherokee 6.4 V8 Hemi SRT Horsepower jeeps.truckstrend.com

An Introduction to Raw Power

In the realm of performance SUVs, few names command as much respect and awe as the Jeep Grand Cherokee SRT. At its very core, the mystique and undeniable appeal of this powerhouse lie squarely with its formidable engine: the 6.4-liter (392 cubic inch) V8 Hemi. When we speak of "Jeep Grand Cherokee 6.4 V8 Hemi SRT Horsepower," we are not merely discussing a number; we are delving into the very essence of what transforms a capable family SUV into a snarling, track-ready beast that can embarrass many sports cars. This article aims to comprehensively explore the horsepower of the Grand Cherokee SRT, examining its impact on performance, the engineering behind it, considerations for owners, and its place in the automotive landscape.

Jeep Grand Cherokee 6.4 V8 Hemi SRT Horsepower

The Grand Cherokee SRT, particularly the WK2 generation (2012-2021) that prominently featured the 6.4L Hemi, stands as a testament to American muscle and engineering prowess. It perfectly blends the practicality and rugged appeal synonymous with the Jeep brand with the unbridled power and aggressive styling of a high-performance vehicle. The horsepower generated by its naturally aspirated Hemi engine is the cornerstone of its exhilarating acceleration, impressive top speed, and surprisingly agile handling for a vehicle of its stature. Understanding this horsepower is key to appreciating the vehicle’s unique capabilities and what sets it apart in a crowded market.

The Heart of the Beast: Understanding the 6.4L Hemi V8 SRT Engine

At the core of the Jeep Grand Cherokee SRT’s formidable performance is the legendary 6.4-liter (392 cubic inch) naturally aspirated Hemi V8 engine. This powerhouse is a direct descendant of Chrysler’s iconic Hemi lineage, known for its hemispherical combustion chambers that promote efficient combustion and prodigious power output.

Factory Horsepower and Torque:
For most of its production run in the WK2 generation (2012-2021), the 6.4L Hemi in the Grand Cherokee SRT consistently produced impressive figures:

• 2012-2017 Models: Typically rated at 470 horsepower and 465 lb-ft of torque.
• 2018-2021 Models: Slightly bumped to 475 horsepower and 470 lb-ft of torque, thanks to minor refinements and calibration updates.

These figures are remarkable for a naturally aspirated SUV, enabling truly breathtaking performance. The engine’s high compression ratio, aggressive camshaft profiles, and efficient intake and exhaust systems contribute significantly to its output. It also features technologies like Variable Valve Timing (VVT) for optimized power delivery across the RPM range and Fuel Saver Technology (MDS – Multi-Displacement System), which can deactivate half of the cylinders under light load conditions to improve fuel efficiency, though this is often overridden in performance driving.

Unleashing Performance: What Horsepower Means for the Grand Cherokee SRT

The horsepower figures of the 6.4L Hemi SRT translate directly into a driving experience that defies expectations for an SUV. This isn’t just about straight-line speed; it’s about the entire dynamic package.

Acceleration and Speed:

• 0-60 mph: The Grand Cherokee SRT, with its 6.4L Hemi, can rocket from 0 to 60 mph in a blistering 4.4 to 4.5 seconds. This places it firmly in the territory of many dedicated sports cars.
• Quarter-Mile: It can complete the quarter-mile sprint in the low 13-second range, with trap speeds well over 100 mph.
• Top Speed: The top speed is electronically limited, typically around 160 mph (257 km/h), a testament to its aerodynamic efficiency and raw power.

Beyond Straight Lines:
While the horsepower is crucial for acceleration, Jeep didn’t stop there. To handle this immense power, the Grand Cherokee SRT is equipped with:

• Performance-tuned Suspension: Adaptive damping systems (Bilstein) provide a balance between comfortable cruising and firm, controlled handling during spirited driving or track sessions.
• Powerful Braking System: Brembo high-performance brakes with large rotors and multi-piston calipers ensure rapid and consistent stopping power, essential for reining in the 475 horses.
• Quadra-Trac Active On-Demand 4×4 System: This sophisticated all-wheel-drive system works in conjunction with various drive modes (Auto, Sport, Track, Snow, Tow) to intelligently distribute power, maximizing traction and optimizing performance in diverse conditions. The Track mode, in particular, sends a higher percentage of torque to the rear wheels for a more rear-wheel-drive feel and improved launch performance.

The horsepower, therefore, is not just a number on a spec sheet; it’s the foundation upon which a truly exhilarating and capable performance SUV is built.

Evolution of Power: Horsepower Across Generations

The 6.4L Hemi V8 engine found its primary home in the WK2 generation of the Jeep Grand Cherokee SRT, which spanned from the 2012 model year through 2021. While the engine largely remained the same, there were subtle refinements over its lifespan.

Initially introduced for the 2012 model year, the 6.4L Hemi replaced the previous 6.1L Hemi found in the WK1 generation SRT8. The increase in displacement directly translated to higher horsepower and torque, providing a significant performance bump. For the first few years (2012-2017), the engine was officially rated at 470 horsepower.

In 2018, coinciding with broader updates to the Grand Cherokee lineup and the introduction of the even more powerful Trackhawk (which uses a supercharged 6.2L Hemi), the naturally aspirated 6.4L Hemi SRT received a slight power increase to 475 horsepower. This was largely due to minor software calibrations and intake improvements, demonstrating Jeep’s continuous pursuit of performance refinement even without major hardware changes.

It’s crucial to differentiate the 6.4L Hemi SRT from the supercharged 6.2L Hellcat engine used in the Grand Cherokee Trackhawk. While both are performance variants, the SRT is the naturally aspirated high-performance model, offering a distinct driving character and a different price point compared to its more extreme, supercharged sibling. The 6.4L SRT, despite being the "lesser" of the two in terms of raw power, remains an incredibly potent and engaging vehicle.

Maximizing Horsepower: Performance Modifications and Tuning

For owners looking to extract even more power from their 6.4L Hemi SRT, a vibrant aftermarket exists. While the factory horsepower is already impressive, carefully chosen modifications and professional tuning can unlock further potential.

Common Modifications:

1. Cold Air Intakes (CAI): One of the simplest and most cost-effective modifications. A CAI allows the engine to breathe colder, denser air, leading to modest horsepower gains (typically 5-15 HP).
2. Aftermarket Exhaust Systems: Upgrading to a less restrictive cat-back or full exhaust system can improve exhaust flow, reduce back pressure, and add a more aggressive exhaust note. Gains can range from 10-25 HP, depending on the system.
3. Long Tube Headers: Replacing the factory exhaust manifolds with long tube headers significantly improves exhaust scavenging, leading to more substantial gains, often in the 20-40 HP range.
4. Camshaft Upgrades: Installing a more aggressive camshaft can dramatically alter the engine’s power band, yielding significant gains (50+ HP), but this is a more involved and costly modification requiring professional installation and tuning.
5. Forced Induction (Supercharging/Turbocharging): While less common for the 6.4L Hemi SRT due to the existence of the factory supercharged Trackhawk, some aftermarket companies offer supercharger or turbocharger kits. These can boost horsepower into the 700+ HP range, transforming the vehicle into an absolute monster. However, forced induction is expensive, puts considerable stress on engine components, and typically requires extensive supporting modifications (fuel system, transmission upgrades, etc.).
6. ECU Tuning/Custom Tunes: This is arguably the most critical modification for maximizing horsepower. Aftermarket tuners can optimize fuel delivery, ignition timing, and transmission shift points to extract the most power safely from the engine, especially when combined with other hardware modifications. A custom dyno tune is recommended for precise calibration.

Important Considerations:

• Reliability: Aggressive modifications, especially forced induction, can impact engine longevity if not done correctly.
• Cost: Performance parts and professional installation/tuning can be expensive.
• Warranty: Most significant modifications will void the factory powertrain warranty.
• Legality: Ensure any modifications comply with local emissions regulations.
• Professional Installation: Always opt for reputable shops with experience working on Hemi engines.

Owning the Power: Maintenance and Considerations for High-Performance Hemi Engines

Owning a Jeep Grand Cherokee 6.4 V8 Hemi SRT means embracing a high-performance lifestyle, which comes with specific maintenance requirements and considerations to ensure longevity and optimal performance.

Key Maintenance Practices:

• Premium Fuel: The 6.4L Hemi is designed to run on premium unleaded gasoline (91+ octane). Using lower octane fuel can lead to reduced performance and potential engine knock due to the engine’s high compression ratio.
• Frequent Oil Changes: Due to the high-performance nature, it’s advisable to adhere strictly to or even shorten the recommended oil change intervals, using high-quality synthetic oil.
• Brake System Maintenance: The powerful Brembo brakes will wear out pads and rotors faster than a standard SUV. Regular inspection and timely replacement are crucial for safety and performance.
• Tire Management: High horsepower and torque, combined with a heavier vehicle, mean tires wear quickly, especially if you enjoy spirited driving. Regular rotations and alignment are essential.
• Cooling System: Ensure the cooling system is in top condition. Overheating can be detrimental to a high-performance engine.
• Transmission Fluid: Follow the manufacturer’s recommendations for transmission fluid changes, especially if the vehicle is frequently driven hard or used for towing.

Cost of Ownership:

• Fuel Economy: Expect modest fuel economy. The 6.4L Hemi is powerful but thirsty, typically averaging around 13-15 MPG combined.
• Insurance: Due to its performance capabilities and higher MSRP, insurance premiums can be higher than a standard Grand Cherokee.
• Parts and Labor: Performance-specific parts and specialized labor can be more expensive than for conventional vehicles.

Potential Challenges:

• Resale Value: While desirable, the niche market for high-performance SUVs means resale value can fluctuate.
• Wear and Tear: Owners who frequently push the vehicle to its limits will experience accelerated wear on components like brakes, tires, and potentially drivetrain parts.

Pricing and Specifications Table: Jeep Grand Cherokee 6.4 V8 Hemi SRT

The "horsepower" itself doesn’t have a price, but the vehicle that houses it does. Below is a comprehensive table summarizing key specifications and approximate pricing information for the Jeep Grand Cherokee 6.4 V8 Hemi SRT (WK2 generation). Prices can vary significantly based on condition, mileage, optional features, and market demand.

Feature / Model Year	2012-2013 SRT8	2014-2017 SRT	2018-2021 SRT
Engine	6.4L V8 Hemi	6.4L V8 Hemi	6.4L V8 Hemi
Factory Horsepower	470 HP	470 HP	475 HP
Factory Torque	465 lb-ft	465 lb-ft	470 lb-ft
0-60 mph (claimed)	4.8 seconds	4.4 seconds	4.4 seconds
Quarter Mile (claimed)	13.3 seconds	13.0 seconds	12.9 seconds
Top Speed (Limited)	160 mph (257 km/h)	160 mph (257 km/h)	160 mph (257 km/h)
Transmission	5-speed Auto	8-speed Auto	8-speed Auto
Original MSRP (Approx.)	$54,495 – $60,000	$64,995 – $68,000	$67,995 – $73,000
Current Used Market Value (Approx.)	$20,000 – $30,000	$30,000 – $45,000	$45,000 – $65,000+

Note: Original MSRPs are for the base SRT model and do not include destination charges, options, or dealer markups. Used market values are highly variable and depend on mileage, condition, maintenance history, and specific trim/options.

Frequently Asked Questions (FAQ)

Q1: What is the exact horsepower of the Jeep Grand Cherokee 6.4L Hemi SRT?
A1: For 2012-2017 models, it’s 470 horsepower. For 2018-2021 models, it’s slightly increased to 475 horsepower.

Q2: How does the 6.4L Hemi SRT compare to the Grand Cherokee Trackhawk?
A2: The SRT uses a naturally aspirated 6.4L V8 Hemi (470-475 HP), while the Trackhawk uses a supercharged 6.2L V8 Hellcat engine (707 HP). The Trackhawk is significantly more powerful and faster but also more expensive.

Q3: Is the 6.4L Hemi engine reliable?
A3: Generally, yes, the 6.4L Hemi is considered reliable when properly maintained. Like any high-performance engine, it requires diligent care, premium fuel, and adherence to maintenance schedules.

Q4: What kind of fuel does the Grand Cherokee SRT require?
A4: It requires premium unleaded gasoline with an octane rating of 91 or higher for optimal performance and engine health.

Q5: Can I increase the horsepower of my 6.4L Hemi SRT?
A5: Yes, there’s a strong aftermarket for modifications like cold air intakes, exhaust systems, headers, camshafts, and ECU tuning. Forced induction (supercharging/turbocharging) is also possible but more costly and complex.

Q6: What are the common issues with the Grand Cherokee SRT 6.4L?
A6: Common considerations include higher fuel consumption, faster wear on tires and brakes due to performance, and potential for "Hemi tick" (a minor valve lifter noise, usually not serious) or exhaust manifold bolt issues on older models.

Q7: What is the fuel economy like for the 6.4L Hemi SRT?
A7: Fuel economy is not its strong suit. Expect around 13-15 miles per gallon combined, with city driving often dipping into the single digits for enthusiastic drivers.

Concluding Summary

The Jeep Grand Cherokee 6.4 V8 Hemi SRT is more than just an SUV; it’s a statement. Its prodigious horsepower, whether 470 or 475, transforms a practical family vehicle into a thrilling performance machine capable of astonishing acceleration and impressive handling for its size. It represents a unique blend of American muscle, SUV versatility, and luxury appeal, offering an exhilarating driving experience that few competitors can match in its segment.

Owning a Grand Cherokee SRT means appreciating its engineering, respecting its power, and committing to the specific maintenance it demands. While it might not be the most fuel-efficient or the cheapest to insure, the sheer joy and capability it provides make it a compelling choice for enthusiasts seeking a truly potent and distinctive vehicle. The 6.4L Hemi SRT’s horsepower isn’t just a number; it’s the very soul of this incredible machine, ensuring its legacy as one of the most exciting performance SUVs ever made.