The Dodge Challenger SRT is already a formidable muscle car from the factory, but adding a TVS2300 supercharger opens the door to serious horsepower numbers. Reaching and safely maintaining over 750 horsepower requires more than just bolting on the blower—it demands a comprehensive, carefully executed tuning strategy. This guide breaks down the essential modifications and calibration approaches to build a reliable, high-output Challenger SRT with the TVS2300.

Understanding the TVS2300 Supercharger

The TVS2300 is a twin-screw supercharger manufactured by Eaton and sold through brands like Edelbrock and Magnuson. Unlike centrifugal superchargers, the twin-screw design displaces a fixed volume of air per revolution, providing instant boost response and linear power delivery. The “2300” refers to its displacement in cubic centimeters per revolution. This supercharger is capable of supporting well over 750 horsepower on the 6.4L and 6.2L Hemi engines found in the Challenger SRT.

For the Challenger SRT (including Scat Pack, 392, and Hellcat variants with proper fuel system upgrades), the TVS2300 offers a significant volumetric efficiency gain. With a stock long block, boost levels around 8-10 psi are typical, but to break the 750whp barrier, you will need to push closer to 12-14 psi and make supporting changes. The TVS2300's thermal efficiency is also high due to its integrated intercooler design, but at elevated power levels, cooling becomes a critical limiting factor.

For reference, the official Edelbrock TVS2300 supercharger kits for Hemi engines provide a solid foundation. However, crossing the 750hp threshold requires going beyond the kit's baseline tune.

Fuel System Upgrades for 750+ Horsepower

Stock fuel systems on Challenger SRT models (including the 392) are typically limited to around 550-600 crank horsepower. To support 750+ horsepower, you must upgrade the entire fuel delivery path.

High-Flow Fuel Injectors

Factory injectors run out of duty cycle well before 750hp. Upgrade to at least 1000cc/min injectors, though many builders recommend 1200-1600cc units to allow for E85 blends. Injector sizing depends on your target fuel and boost level. Use a quality brand like Injector Dynamics or FIC.

Fuel Pump and Pressure Regulation

A high-volume in-tank pump (such as a Walbro 485 or a dual-pump setup) is essential. For most 750+whp builds, a return-style fuel system with an external pressure regulator offers more precise control and consistent pressure under high boost. If you plan to run E85, you will need even higher flow rates—often a dedicated brushless pump or a mechanical belt-driven pump.

Fuel Lines and Rails

Upgrade to -6AN or -8AN feed lines and billet fuel rails to handle the increased volume and pressure. The stock nylon lines can collapse or rupture under sustained high pressure. Metal lines or PTFE-lined hoses are recommended for safety and flow.

Do not overlook the fuel pump control module. Many Dodge Challenger SRT models require a voltage booster or a dedicated controller to keep pump voltage stable at high current draw. This prevents fuel pressure drop at high RPM.

For a deeper dive into fuel system requirements, check out this comprehensive fuel system guide for supercharged Hemis.

Engine Management Tuning

The stock ECU on Challenger SRT models is powerful but locked. To achieve 750+ horsepower safely, you need access to advanced tuning parameters. Options include:

  • Piggyback modules like the DiabloSport Trinity or HP Tuners MPVI3 for those who need to keep emissions readiness. These can adjust fuel, timing, and boost control.
  • Standalone ECU (e.g., Holley Dominator or MoTeC) for full control, especially if running a cam swap or dual fuel pumps.
  • Custom remote tuning via reputable Dodge specialists who have experience with TVS2300 setups at 750+ horsepower.

Ignition Timing and Knock Control

High boost demands conservative timing. At 12-14 psi on pump gas (91-93 octane), start with 12-16 degrees of total ignition advance near peak torque and taper to 18-20 degrees at redline. Use knock sensors and a knock margin of at least 2-3 degrees. For E85, you can run 2-4 degrees more timing thanks to its cooling effect and higher octane.

Boost Control

The TVS2300 is driven by a belt, so boost is fixed by pulley ratio. To limit boost at lower RPM for traction, you may incorporate a boost bypass valve or a boost controller that bleeds the actuator signal. However, many high-power builds simply run a fixed pulley and rely on the ECU to pull timing or cut throttle if boost exceeds targets.

Throttle Body Calibration

Stock drive-by-wire can cause hesitation at tip-in when manifold pressure is high. Tuning the pedal-to-throttle translation table and the torque-based model improves drivability and prevents surging.

A dedicated tuning tool like HP Tuners MPVI3 is essential for direct ECU access. Many professional tuners use this platform for Dodge Hemi tuning.

Air-Fuel Ratio Monitoring

Precise air-fuel ratio (AFR) is the single most important factor for safe high-power tuning. A wideband O2 sensor is mandatory—ideally two (one per bank) for accurate cylinder-to-cylinder monitoring.

Target AFRs

  • Pump gas (93 octane): 11.5-11.8:1 under boost (lambda 0.78-0.80).
  • E85: 7.0-7.5:1 (lambda 0.85-0.90) due to stoichiometric differences.
  • Full throttle: Aim for lambda 0.77-0.80 on pump gas, 0.82-0.85 on E85.
  • Cruise/part throttle: Lambda 1.0 (14.7:1 on gas) for fuel economy and idle quality.

Use a wideband controller that logs to your tuning suite. Many tuners recommend the AEM X-Series or Innovate MTX-L for reliability.

Cooling System Optimization

Heat is the enemy of forced induction, especially when chasing 750+ horsepower. The TVS2300 kits come with an air-to-water intercooler, but the factory heat exchanger and slush pump may not keep up with sustained boost.

Intercooler System Upgrades

  • Larger heat exchanger: Replace the stock unit with a dual-pass or triple-pass unit (e.g., Mishimoto or AFCO). Mount it in the grille or lower bumper opening.
  • Electric water pump: Install a higher-flow pump (e.g., Davies Craig or Bosch motorsport). Keep the pump running post‑shutdown with a timer to reduce heat soak.
  • Reservoir and ice box: For drag racing, a separate ice reservoir filled with ice water allows intake temps to drop significantly between runs.
  • Water/methanol injection: A stage 2 or 3 system (e.g., Snow Performance or AEM) can inject a mix of water and methanol into the charge air, effectively cooling it and raising octane. This is particularly valuable on pump gas.

Engine Cooling

The engine itself also needs better cooling. Upgrade to a high-flow radiator (aluminum, dual-pass), a 180°F thermostat, and a high-speed electric fan kit. Oil coolers (engine and transmission) become necessary at 750+whp to maintain oil temperatures below 250°F.

For detailed heat exchanger sizing, consult engineering guidelines on heat exchanger design.

Exhaust System Selection

The stock exhaust is a restriction at high power. A free-flowing system reduces backpressure and lowers exhaust gas temperatures, allowing the turbo (or supercharger) to work less and produce more power.

Headers

Long-tube headers (1-7/8″ or 2″ primary tubes) with a 3″ collector are preferred. They improve scavenging and lower exhaust backpressure, especially important for 750+ hp. Ceramic coating helps retain heat in the pipes, increasing exhaust velocity.

Mid-Pipes and Mufflers

Keep the system to 3″ diameter from the header collector to the mufflers. An X-pipe equalizes exhaust pulses and increases power. Use high-flow catalytic converters if you need to pass emissions, or switch to a catless setup for maximum flow (check local laws).

Exhaust Exit

A 3.5″ or larger single rear exit, or dual 3″ tips, are common for high-HP Challengers. Avoid restrictive mufflers; look for chambered or straight-through designs that flow well.

Additional Supporting Modifications

Reaching 750+ horsepower on a TVS2300-charged Challenger SRT may require internal engine upgrades, especially if the engine is not the Hellcat 6.2L.

  • Camshaft: A mild to aggressive cam (230-240+ degrees duration at 0.050″) helps fill the cylinders more completely. Pair with upgraded pushrods, lifters, and trunnion bearings.
  • Valve springs and retainers: High-lift cams and boost can cause valve float. Use dual springs with titanium retainers.
  • Head studs: Stock head bolts can stretch under high cylinder pressure. Upgrade to ARP 2000 or L19 head studs.
  • Pistons and rods: For 750whp, forged pistons and rods are strongly recommended, especially if you plan to run E85 and high boost regularly. The stock 6.4L pistons are hypereutectic and susceptible to cracking.
  • Clutch or torque converter: Manual cars need a twin-disc clutch capable of holding 750+ ft-lbs. Automatic cars need a billet torque converter with a higher stall speed (2800-3200 RPM) and a upgraded valve body to prevent slippage.

Testing and Validation

No tuning strategy is complete without validation. Here’s the recommended process:

  1. Dyno tuning: Work with a chassis dyno (Dynojet or Mustang) to dial in the fuel and timing maps at 200 RPM increments from idle to the redline. Log IAT, EGT, boost, AFR, and fuel pressure.
  2. Street tuning: After the dyno, perform a series of part-throttle and full-throttle pulls on the road to verify knock control and transient response. Look for any fuel starvation during aggressive cornering and braking.
  3. Data analysis: Review logs for abnormal knock counts, fuel pressure drops, or spark blowout. Many tuners use HP Tuners or Holley EFI software to overlay multiple runs and check consistency.
  4. Altitude and temperature compensation: If you live in a high-altitude or hot climate, adjust the barometric correction and the VE tables accordingly.
  5. Safe limits: Set a soft rev limiter or boost cut if any parameter exceeds safe thresholds (e.g., EGT > 1650°F, IAT > 140°F, knock counts > 3).

Conclusion

Achieving 750+ horsepower with the TVS2300 supercharger on a Dodge Challenger SRT is a challenging but well-documented path. The key lies in treating the supercharger as part of a complete system: fuel, engine management, cooling, exhaust, and internal engine strength must all be addressed in tandem. By following the strategies outlined above—upgrading fuel system components, tuning the ECU precisely, monitoring AFRs, optimizing cooling, and selecting appropriate supporting mods—you can build a Challenger that delivers exhilarating power without sacrificing reliability. Trust your tuning to proven professionals, and always validate with real-world testing before pushing the motor to its limits.