The Ram TRX already commands respect with its factory 702 horsepower and 650 lb-ft of torque, but serious enthusiasts know that stock is never the ceiling. The 2.65L Whipple supercharger is one of the most popular aftermarket upgrades for the TRX, and for good reason. It replaces the factory Eaton TVS supercharger with a larger, more efficient twin-screw unit that can push power well beyond 900 horsepower at the crank. This article breaks down the real-world gains, the factors that influence them, and what you need to know before pulling the trigger.

The Ram TRX Engine Platform

Under the hood of every Ram TRX sits the 6.2L HEMI V8, also known as the “Hellcat” engine. Even in stock form it features a forged steel crankshaft, forged connecting rods, and aluminum pistons designed to handle forced induction. The factory supercharger is a 2.4L Eaton TVS unit that produces about 14.5 psi of boost at 6,200 rpm. While robust, the stock setup leaves room for improvement because the engine block and rotating assembly are capable of supporting significantly more power with the right air delivery system.

The TRX’s induction system, intercooler, and fueling components are already sized for the Hellcat engine, but they become bottlenecks when you try to exceed the factory boost envelope. That is exactly where a larger supercharger like the Whipple 2.65L comes into play. By increasing the displacement of the compressor, you can move more air per revolution without spinning it to unsafe speeds.

Whipple 2.65L Supercharger Overview

Whipple superchargers use a twin-screw design that differs from the Eaton TVS Roots-style unit. Twin-screw compressors are inherently more efficient because they compress air internally before discharging it into the intake manifold. This reduces heat buildup and parasitic loss, meaning more of the engine’s power is converted into usable horsepower rather than wasted heat. The 2.65L model is the largest bolt-on supercharger available for the TRX without requiring major engine modifications.

The kit includes a new dual-brick air-to-water intercooler, larger throttle body, and an open-element intake system. It also repositions the inlet and bypass valve for smoother airflow. According to Whipple, the system is designed to deliver up to 18 psi of boost while maintaining safe intake air temperatures. The intercooler is paired with an upgraded heat exchanger and a high-flow water pump to reject heat more effectively than the factory setup.

Real Power Gains

On a stock Ram TRX with 93-octane fuel, a properly tuned 2.65L Whipple supercharger typically produces 900 to 920 horsepower at the crank and 820 to 840 lb-ft of torque. On a chassis dynamometer, that translates to roughly 760–780 wheel horsepower and 700–720 wheel torque. The stock TRX dynos around 570–590 wheel horsepower, so the gain is approximately 170–200 wheel horsepower.

If you switch to E85 ethanol fuel or a race blend, the numbers climb further. Several tuners have reported 960–980 crank horsepower with E85, an upgraded fuel system, and a more aggressive calibration. Torque can exceed 900 lb-ft at the crank. These figures are consistent across multiple dyno runs from shops that specialize in Hellcat and TRX builds, such as Hennessey Performance and DSTech Calibrations.

Dyno Results and Real-World Testing

One often-cited test comes from a customer who installed the Whipple 2.65L on a 2021 TRX with only a cat-back exhaust as a supporting mod. The baseline dyno pull showed 588 wheel horsepower. After the supercharger and a custom tune, the same truck laid down 776 wheel horsepower and 717 lb-ft of torque — a gain of 188 wheel horsepower. Quarter-mile times dropped from 12.5 seconds at 108 mph to 11.2 seconds at 122 mph on street tires. With drag radials, mid-10-second passes are achievable.

Another independent test by a forum member using a Mustang AWD dyno recorded 752 wheel horsepower with 93 octane and a conservative tune. The same truck later ran E85 and hit 802 wheel horsepower. Torque was still climbing at the dyno’s limit. These numbers come from Ram-TRX.com, where owners share real data.

Factors That Affect Final Horsepower

While the Whipple 2.65L kit is capable of big numbers, your actual results will vary depending on several variables. Understanding these factors helps you set realistic expectations and plan your build.

The Role of Engine Tuning

Tuning is the single most important factor. The Whipple kit includes a canned ECU calibration that works well for a mild setup, but custom tuning extracts the full potential. Experienced Hellcat tuners adjust fuel timing, boost-by-gear, throttle mapping, and torque management tables. You can expect an extra 30–50 horsepower from a custom tune over the base calibration. Many tuners use HP Tuners or MoTeC software and require multiple revisions based on data logs. Without proper tuning, you risk detonation and engine damage.

Fuel Quality and Octane

Higher octane fuel allows more aggressive ignition timing and boost. On 91 octane, the Whipple 2.65L will produce about 850 crank horsepower. On 93 octane, that jumps to 900+. With E85, the combination of higher octane (around 105) and cooling effect from ethanol can push you past 950 crank horsepower. However, E85 requires a substantial fueling upgrade: the stock fuel injectors and low-pressure pump are insufficient. Most tuners recommend a dedicated E85 kit with 1000cc injectors and a boost-a-pump or larger in-tank pump.

Supporting Modifications

To reliably handle 900+ horsepower, you need to address supporting systems. Here are the most common upgrades paired with the Whipple 2.65L:

  • Long-tube headers – Reduce backpressure and lower exhaust gas temperatures. Gains of 15–25 hp are typical.
  • Cat-back or axle-back exhaust – Improves flow and changes sound; adds only 5–10 hp but improves spool.
  • Cold-air intake – The Whipple kit includes a high-flow intake, but some aftermarket options like AFE or K&N may work with minor modifications.
  • Larger fuel injectors – Necessary for E85 and aggressive tunes. 1,000 cc/min or larger.
  • Heat exchanger upgrade – A larger heat exchanger (e.g., from AFE or Whipple) reduces intake air temperatures during repeated hard pulls.
  • Lower-temperature thermostat – Helps maintain cooler engine coolant, indirectly benefiting the intercooler.

Most builders recommend at least headers, an upgraded heat exchanger, and a custom tune to safely reach the 900 hp range. Skipping these items might still yield gains, but you may leave power on the table or risk heat soak.

Installation Process and Considerations

The Whipple 2.65L supercharger kit is designed as a direct bolt-on for the Ram TRX. It replaces the entire factory supercharger assembly including the intake manifold. The installation is not for the faint of heart but is well within the capability of a skilled mechanic with lifted equipment.

Step-by-Step Overview

  1. Disconnect battery and drain coolant – The cooling system interconnects with the supercharger, so coolant must be drained.
  2. Remove the factory intake, throttle body, and supercharger assembly – This involves unbolting the intercooler, bypass valve, and several lines.
  3. Swap the auxiliary coolant pump and install the new heat exchanger – The Whipple kit includes a larger pump and instructions for routing hoses.
  4. Install the new Whipple supercharger – It bolts onto the factory mounting studs. A new gasket is required.
  5. Attach the throttle body and intake tube – The supplied throttle body is larger than stock, so the intake tube must match.
  6. Connect the intercooler lines and fill with coolant – Use the supplied coolant or a 50/50 mix.
  7. Wire the sensor harness and load the calibration – The kit includes a handheld programmer that loads the base tune.
  8. Prime the supercharger oil and check for leaks – Whipple provides a specific oil for the unit.

Professional installation typically takes 8–12 hours and costs between $1,500 and $3,000 in labor. Many owners choose to do it themselves, but attention to detail is critical — a single vacuum leak can cause idle issues or lean conditions.

Warranty and Reliability

Whipple offers a one-year warranty on the supercharger assembly. However, installing it will void the factory powertrain warranty on your Ram TRX. That is a decision each owner must weigh. In terms of engine longevity, the factory Hellcat block and forged internals are rated for well over 900 horsepower. With a conservative tune and good fuel, many Whipple-equipped TRXs have accumulated tens of thousands of miles without issues. The weak point is often the driveshaft or transmission — the 8HP95 eight-speed automatic can handle 900 lb-ft, but repeated high-torque launches may reduce its life.

Driving Experience and Performance

Throttle response with the Whipple 2.65L is noticeably sharper than stock. The larger twin-screw compressor moves more air immediately, so boost builds faster at lower RPMs. Owners describe the pull as relentless, with torque peaking early and holding strong past 6,000 rpm. Off-road, the extra torque gives the TRX easier wheel spin in sand and better hill-climbing ability. On pavement, the truck becomes capable of high-10-second quarter-mile passes with minimal modifications.

One trade-off is sound. The Whipple supercharger produces a distinct whine that is louder than the factory Eaton unit. Some owners love it; others find it obtrusive during daily driving. The intake noise is also more pronounced. If you prefer a stealthy appearance, the Whipple kit fits under the factory hood — no hood scoop required — so the external look remains stock.

Cost and Value

The Whipple 2.65L supercharger kit for the Ram TRX retails for approximately $8,500 to $10,000, depending on the supplier and any package options (e.g., with or without the handheld programmer). Adding labor, tuning, and supporting mods brings the total to around $12,000–$15,000. For that investment, you gain roughly 200 horsepower at the wheels. Compare that to other upgrades: a full long-tube header and exhaust system might cost $3,000 for 30–40 hp, or a cam swap could run $5,000 for 50–60 hp. The Whipple supercharger delivers more horsepower per dollar than any other single modification for the TRX.

Resale value also holds relatively well. TRXs with a Whipple 2.65L installed by a reputable shop often sell for a premium, though you will not recoup the full cost. If you plan to keep the truck long-term, the driving experience makes the upgrade worthwhile.

Conclusion

The 2.65L Whipple supercharger is the definitive power adder for the Ram TRX. It transforms an already potent off-roader into a 900+ horsepower monster that dominates both on the street and in the dunes. Real-world dyno results show consistent gains of 170–200 wheel horsepower with 93 octane, and even more with E85. The key to reliability is professional installation and custom tuning. If you are ready to unlock the full potential of your Hellcat-powered truck, the Whipple 2.65L delivers exactly what the numbers promise.