The Dodge Charger is already a high-performance machine, but for enthusiasts who hunger for even more power, forced induction is the next logical step. Among the most respected aftermarket superchargers, the Whipple 2.9L twin-screw unit stands out for its efficiency, reliability, and massive power potential. This comprehensive guide examines exactly how much power a Whipple 2.9L supercharger can add to a Dodge Charger, covering gains for different engines, required supporting modifications, installation considerations, and real-world results. Whether you own a 5.7L HEMI, a 6.4L HEMI, or a 6.2L Hellcat-based Charger, you’ll get a clear picture of what this supercharger can deliver.

What Is the Whipple 2.9L Supercharger?

The Whipple 2.9L supercharger is a twin-screw positive-displacement unit designed for late-model HEMI engines. Unlike centrifugal superchargers that build boost progressively at high RPM, the twin-screw design provides instant throttle response and near-linear boost delivery from idle to redline. With a displacement of 2.9 liters (cubic inches equivalent to 177), it spins up to 19,000 RPM and supports boost levels up to 14–18 psi depending on pulley selection and engine setup. Whipple’s proprietary screw rotors, combined with an integrated charge-air cooler, keep intake temperatures low and power consistent. For Dodge Charger owners, the 2.9L is widely regarded as a well-balanced upgrade – potent enough for serious horsepower yet manageable for daily driving when properly tuned.

Power Gains by Engine Configuration

The amount of additional power the Whipple 2.9L adds depends heavily on which engine is under the hood. Here’s a detailed breakdown for the three most common Charger engines, along with typical crankshaft horsepower increases with minimal supporting mods and a conservative tune:

5.7L HEMI (Eagle / VVT)

The 5.7L Chrysler HEMI is a strong, reliable engine, but its factory output (around 370 hp) leaves room for improvement. With a Whipple 2.9L supercharger at roughly 6–8 psi on 91 octane, owners typically see 140–170 wheel horsepower gain over stock, translating to approximately 170–200 crank horsepower. Total output can reach 540–570 crank hp on a safe tune. For an extra punch, upgrading the fuel system with larger injectors (e.g., ID1050x) and a boost-a-pump allows running 10–12 psi, pushing gains closer to 250+ wheel hp and 700+ crank hp. However, the 5.7L’s internals become a limiting factor above 650 hp, so piston and rod upgrades are recommended for sustained high-boost use.

6.4L HEMI (Apache)

The 6.4L HEMI found in 2015+ Charger R/T Scat Pack and SRT 392 models offers larger displacement, better heads, and forged connecting rods. Running the Whipple 2.9L at 8–10 psi on 93 octane yields 180–220 wheel horsepower gain, bumping factory output from 485 hp to about 665–705 crank hp. With E85 fuel, a smaller pulley, and a full exhaust, some builds have achieved 350+ wheel hp gains, exceeding 800 crank hp. The 6.4L’s cast pistons are the weak point around 700–750 wheel hp; forged pistons are strongly advised at that level. Despite that, a 6.4L Charger with a Whipple 2.9L is a proven combination for 10-second quarter-mile times with street-friendly manners.

6.2L Supercharged HEMI (Hellcat / Demon / Redeye)

For Charger SRT Hellcat or Redeye owners, adding a Whipple 2.9L might seem redundant because the factory 2.4L IHI supercharger already makes 707–797 hp. However, the Whipple 2.9L is a direct upgrade that flows more air and produces less heat than the stock unit. On a Hellcat with bolt-ons (ported throttle body, intake, catless downpipes, lower pulley), the Whipple 2.9L adds 120–180 wheel horsepower on 93 octane, bringing total output to 850–950 crank hp. With E85 and a larger upper pulley, gains can exceed 300 wheel hp, pushing the Charger well beyond 1,000 crank horsepower. The Hellcat’s forged internals handle 1,000+ hp reliably, making the Whipple 2.9L an excellent platform for big power without an engine build.

Supporting Modifications Needed

To safely realize the power gains listed above, certain supporting modifications are essential. The Whipple 2.9L kit comes with a cast-aluminum intake manifold, twin 90mm throttle body, fuel rails, injectors (typically 80 lb/hr), an intercooler system, and a belt drive. However, these components are often a baseline for moderate boost. For more aggressive setups, consider the following:

  • Fuel System: Stock fuel pumps may not keep up with the extra demand. A drop-in pump (e.g., DW400) or a dual-pump setup (e.g., Fore Innovations) is recommended for 650+ wheel hp. Larger injectors (1000–1300cc) and a boost-referenced fuel pressure regulator are needed for E85.
  • Exhaust: Headers (1-7/8” or 2”) and a full 3” cat-back exhaust reduce backpressure and improve spool. For Hellcat Chargers, catless downpipes and a free-flowing exhaust can unlock 30–50 hp.
  • Intake: A high-flow cold-air intake is necessary to feed the supercharger. The Whipple kit includes a good intake, but an aftermarket one like a Roar Pedal or JLT may offer additional gains.
  • Intercooling: Whipple’s proprietary charge cooler is efficient up to about 12 psi. For higher boost, upgrading to a larger intercooler brick or adding a secondary heat exchanger (e.g., Killer Chiller) helps maintain consistent power on hot days.
  • Drivetrain: The 8HP70 automatic transmission in 5.7L/6.4L Chargers can handle up to 650 lb-ft with proper tuning; beyond that, a billet torque converter and transmission cooler are advised. The Hellcat’s 8HP90 is stronger but still benefits from an upgraded torque converter for aggressive launches.
  • Engine Internals: As noted, the 5.7L and 6.4L pistons are cast and prone to failure above 700 wheel hp. Forged pistons (Diamond, Manley) and rods are a wise investment if you plan to run high boost or race fuel. The Hellcat’s forged crankshaft and rods can tolerate 1,000+ hp with proper tuning.

Installation Considerations

Installing a Whipple 2.9L supercharger on a Dodge Charger is a job best left to experienced professionals, but DIY enthusiasts with good mechanical skills can complete it in a weekend. The basic steps include removing the factory intake manifold and throttle body, installing the supercharger with its intercooler brick, running the intercooler lines, connecting the fuel system, and mounting the new accessory drive. The Whipple kit is designed to be a direct fit, meaning no cutting or major fabrication. However, clearance issues can arise with strut tower braces or aftermarket catch cans; some repositioning may be necessary. Expect to spend 8–12 hours labor if done by a shop, or two full days if you’re working in your garage with basic tools.

Beware of common pitfalls: The supercharger’s large size may require trimming the engine cover (or removing it). The drive belt routing must be precise – Whipple includes a tensioner, but checking belt alignment is critical. Also, the intercooler pump wiring should be connected to a switched 12V source to avoid draining the battery. Finally, after installation, a thorough check for vacuum leaks and coolant leaks before starting the engine is essential.

Tuning and Calibration

No supercharger installation is complete without professional tuning. The Whipple 2.9L kit may come with a canned tune (often via a handheld device), but custom tuning on a dyno or via remote calibration (e.g., HP Tuners, Diablosport Trinity) is strongly recommended for maximizing power and safety. A professional tuner will adjust air-fuel ratios, ignition timing, boost targets, transmission shift points, and torque management settings. Expect to pay $400–$800 for a custom tune, plus additional costs if a dyno session is included. For E85 tuning, the injector duty cycle and ethanol content must be dialed in to prevent lean conditions. A well-tuned Whipple 2.9L setup will feel seamless, with crisp throttle response and no surging or detonation.

Cost Considerations

The Whipple 2.9L supercharger kit for a Dodge Charger typically retails between $7,500 and $9,000, depending on whether you buy new from an authorized dealer (like Whipple’s own store or Summit Racing) or from a specialty shop (e.g., Lingenfelter Performance Engineering). Installation labor adds another $1,000–$2,000. Supporting modifications – fuel system, exhaust, tires, and a transmission upgrade – can easily push total cost to $12,000–$18,000 for a reliable 700+ wheel horsepower setup. On a Hellcat Charger, the upgrade is simpler (swap the supercharger only) with costs around $9,000 including tuning, making it one of the best dollar-per-horsepower upgrades available.

Frequently Asked Questions

Yes, when installed with a CARB-legal tune (EO number), the Whipple 2.9L is 50-state emissions legal for late-model HEMI Chargers. Whipple offers a CARB-approved version for 5.7L and 6.4L engines. Hellcat vehicles may require a standalone CARB-legal calibration.

How does it affect fuel economy?

Under normal driving, fuel economy drops about 1–2 mpg because you’re driving a heavier car with more parasitic drag from the supercharger. Under full throttle, expect single-digit mpg. However, if you stay out of boost, the difference is minimal.

Will the supercharger fit under the stock hood?

Yes, the Whipple 2.9L kit is designed to clear the stock hood on all Charger models (2011–2023). There is about ¼” of clearance above the supercharger lid. For extreme builds with a larger intercooler brick, a slim hood may be required.

Can I use the Whipple 2.9L with a stock transmission?

In moderate gain levels (up to 650 wheel hp), the 5.7L/6.4L Charger’s 8HP70 transmission holds up with good tuning – but for repeated hard launches or drag racing, upgrading to a billet torque converter and adding a cooler is wise. The Hellcat’s 8HP90 is robust for up to 900 wheel hp; beyond that, a built transmission is needed.

External Resources

For further reading and real-world build logs, check the following links:

Conclusion

The Whipple 2.9L supercharger is a proven power adder for the Dodge Charger, delivering impressive gains across all HEMI variants. On a 5.7L, expect 170–200 crank horsepower; on a 6.4L, 180–220 crank hp; and on a Hellcat, 120–180 crank hp on pump gas, with substantially higher numbers on E85 and supporting mods. While the total investment can reach $15,000+ for a complete, reliable system, the transformation in performance is dramatic – turning a stock Charger into a serious 10-second or even 9-second street car. For enthusiasts who demand immediate, consistent power, the Whipple 2.9L remains one of the best bolt-on superchargers available for the Dodge Charger platform.