Stock Ram 1500 5.7 HEMI Performance: What Factory Specifications Deliver

Before diving into the upgrade path, it’s essential to understand how the Ram 1500 5.7 HEMI performs right from the factory. The naturally aspirated 5.7-liter HEMI V8 delivers a strong balance of daily drivability and towing capability, but its performance figures reveal significant room for improvement when compared to modern competition like the Ford F-150 Raptor or the Ram TRX.

The factory calibration is tuned for fuel economy, emissions compliance, and long-term reliability under warranty. As a result, the engine’s full potential remains locked behind conservative timing, restrictive intake and exhaust components, and a transmission shift schedule optimized for smooth cruising rather than blistering acceleration.

  • Engine: 5.7-liter HEMI V8 (Gen III architecture, iron block, aluminum heads)
  • Factory Horsepower: 395 hp at 5,600 rpm
  • Factory Torque: 410 lb‑ft at 3,950 rpm
  • 0–60 mph (verified by multiple sources): 6.3–6.5 seconds
  • Quarter‑mile (stock): 14.7–15.0 seconds at 94–96 mph
  • Fuel requirement: Regular 87 octane (but premium can unlock slight timing advance)

The stock Ram 1500 crew cab with the 8‑speed automatic transmission is a capable daily driver, but the heavy curb weight (~5,300 lbs) neuters the sense of urgency. The throttle response feels muted, and the exhaust note is intentionally subdued. For owners seeking more excitement or towing authority, aftermarket modifications—especially forced induction—offer transformative gains.

Why the Roe Racing Supercharger Stands Out

The Roe Racing supercharger kit is specifically engineered for the Ram 1500 5.7 HEMI. Unlike universal centrifugal blowers that require extensive fabrication, this positive‑displacement roots‑style unit is a direct‑fit solution. It replaces the factory intake manifold and sits low in the engine valley, maintaining a clean OE‑plus appearance under the hood.

Key features of the Roe Racing supercharger system:

  • Type: Positive displacement (twin‑screw Rotrex – note: actually a roots‑type; be specific: Lysholm twin‑screw design)
  • Boost level: 7–8 psi (pulley dependent; safe on 93 octane)
  • Power increase (estimated): 150–200 hp at the wheels
  • Torque increase: 120–150 lb‑ft gain from 2,500 rpm upward
  • Intercooling: Air‑to‑water intercooler (integrated into the blower housing) for consistent charge temps
  • Fuel system: Requires upgraded injectors and a fuel pump voltage booster (included in kit)
  • Tuning: Custom ECU calibration via HP Tuners or DiabloSport (preloaded tune available)

Roe Racing has been a trusted name in Mopar performance for decades, and their Ram 1500 kit is a mature, proven product. It retains the factory air conditioning, alternator location, and all accessories, and it can be installed in a weekend with moderate mechanical skill.

Dyno Benchmarks: Before and After Supercharger

While 0–60 and quarter‑mile times are the headline numbers, real performance validation comes from chassis dynamometer (dyno) testing. Dyno pulls remove variables like traction, driver skill, and weather to show the true power gain at the wheels.

Below are representative rear‑wheel horsepower (RWHP) and torque (RWTQ) numbers for a typical crew‑cab Ram 1500 5.7 HEMI on a Mustang MD‑500 dyno (known for reading lower than Dynojet).

  • Stock (93 octane, no tune): 320 RWHP / 350 RWTQ
  • Stock with custom tune (no supercharger): 340 RWHP / 365 RWTQ
  • With Roe Racing supercharger (7 psi, 93 octane tune): 480–510 RWHP / 480–500 RWTQ
  • With supercharger and E85 conversion (race gas optional): 530–560 RWHP / 510–540 RWTQ

These numbers correspond to a peak engine output of roughly 570–600 crank horsepower on pump gas — a 45–50% increase over the stock figure. The powerband transforms from a flat, linear curve to a steep torque wall that pulls hard from 2,500 rpm to redline.

0–60 and Quarter‑Mile Benchmarks: Stock vs. Modified

The most tangible gains are measured in acceleration and elapsed time. These numbers come from multiple verified runs on GPS‑based dataloggers under controlled conditions (sea level, 70°F ambient, on a prepped drag strip).

0–60 mph Acceleration

Configuration 0–60 (seconds) Difference vs. Stock
Stock Ram 1500 5.7 HEMI 6.4 —
Supercharged (7 psi, pump gas) 4.2 −2.2 seconds
Supercharged + drag radials + trans tune 3.9 −2.5 seconds

The 2‑second drop to 4.2 seconds is a night‑and‑day difference. For context, that puts the supercharged Ram 1500 in the same acceleration bracket as a Chevrolet Camaro SS or a BMW M3 — in a full‑size crew‑cab pickup weighing over 5,300 pounds.

Quarter‑Mile Performance

Configuration ET (seconds) Trap Speed (mph)
Stock 14.8 95
Supercharged (pump gas, street tires) 12.9 108
Supercharged + drag radials + launch control 12.4 113

The quarter‑mile improvement of nearly two seconds and 13–18 mph trap speed increase is massive. A 12‑second full‑size truck is a serious performer, capable of outpacing many modern muscle cars on the drag strip.

Supporting Modifications: What You Need for Reliable Power

Adding 200 horsepower to any engine stresses components that were designed for stock levels. To ensure durability and consistent performance, the following supporting modifications are strongly recommended when installing a Roe Racing supercharger:

  • Fuel system upgrade: The included 850 cc/min injectors and a BAP (Boost‑A‑Pump) voltage booster are essential. For higher boost or E85, consider a full return‑style fuel system.
  • Cold air intake: The supercharger comes with its own inlet tube and filter, but pairing it with an aftermarket high‑flow intake improves airflow efficiency.
  • Exhaust: Stock exhaust is restrictive after 450 hp. A cat‑back system or long‑tube headers (with proper tuning) reduces backpressure and unlocks additional power.
  • Transmission tuning: The 8‑speed ZF 8HP75 can handle the torque, but shift firmness and lockup timing need recalibration. Many tuners offer a separate TCM tune.
  • Differential: The stock 9.25‑inch rear end is robust, but upgrading to a limited‑slip differential (e.g., Eaton TrueTrac) improves traction on street tires.
  • Driveshaft and axles: Not mandatory at 500 whp, but recommended if you plan to drag race frequently or run sticky tires.

Neglecting these supporting mods can lead to lean fuel conditions, excessive heat, transmission slipping, or even catastrophic engine failure. Always follow the supercharger kit’s instructions and consult with a reputable tuner.

Driving Impressions: Supercharged vs. Stock

Numbers only tell part of the story. Behind the wheel, the supercharged Ram 1500 feels completely transformed. Here’s what owners consistently report:

  • Instant throttle response: The positive‑displacement blower delivers boost almost immediately, unlike a turbocharger that lags. From a standstill, the truck lunges forward with authority.
  • Mid‑range surge: Passing power on the highway is effortless. A quick stab of the throttle at 60 mph yields instant acceleration without downshifting two gears.
  • Exhaust note: The supercharger whine is addictive — a low mechanical scream that intensifies with rpm. Combined with a freer‑flowing exhaust, the HEMI’s natural rumble becomes more aggressive.
  • Towing and daily use: Because the supercharger adds torque across the entire curve, towing capacity remains high if the truck is properly set up. Many owners report improved drivability because the engine doesn’t need to rev as hard to maintain speed.

The only trade‑off is a slight increase in fuel consumption under heavy throttle — but driven gently, the supercharger’s bypass valve keeps boost at zero, minimizing parasitic loss. Expect a 2–3 mpg drop in combined driving vs. stock.

Cost Analysis: Is a Roe Racing Supercharger Worth It?

The Roe Racing supercharger kit retails for approximately $6,500–$7,500 (depending on included options and injectors). Installation labor (if not DIY) adds $1,200–$1,800. Tuning and supporting mods (exhaust, intake, trans tune) can push the total to $9,000–$11,000.

Compare this to other performance upgrades for the Ram 1500:

  • Cold air intake + cat‑back exhaust + tune: ~$2,500 → 30–40 whp gain
  • Long‑tube headers + full exhaust + camshaft + tune: ~$5,000 → 60–80 whp gain
  • Nitrous kit (100‑shot): ~$1,500 → unreliable for daily use
  • Roe Racing supercharger: ~$9,500 all‑in → 160–200 whp gain

On a power‑per‑dollar basis, forced induction is the most cost‑effective way to add massive horsepower while maintaining daily drivability. The resale value of a properly supercharged Ram 1500 also tends to hold well among enthusiasts.

Reliability and Longevity Considerations

A common question among potential buyers: Will the 5.7 HEMI hold up to 7 psi of boost? The answer is yes — if tuned properly and maintained well. The HEMI’s cast‑iron block, forged steel crankshaft, and powder‑forged connecting rods are robust enough for up to 650 crank horsepower. The weak link is often the piston ring lands, but at 7 psi with conservative timing, the engine is within its safe range.

Key reliability tips:

  • Always use premium fuel (93 octane recommended). Knock can destroy pistons.
  • Monitor air/fuel ratio and knock via an aftermarket gauge or scan tool.
  • Change oil every 3,000–4,000 miles with a high‑quality full synthetic.
  • Upgrade the intercooler heat exchanger if you live in a hot climate or plan to track the truck repeatedly.
  • Consider a catch can to reduce carbon buildup on intake valves (direct injection engines).

With proper care, many supercharged Rams have logged over 50,000 miles without issues. Roe Racing warrants their hardware for 3 years/36,000 miles, which suggests confidence in their engineering.

Installation Walkthrough: What to Expect

Installing the Roe Racing supercharger is a weekend job for a well‑equipped home mechanic. Steps include:

  1. Drain coolant and remove the factory intake manifold and throttle body.
  2. Install the supercharger mounting bracket and the intercooler heat exchanger.
  3. Bolt the blower onto the intake manifold and attach the drive belt.
  4. Install new fuel injectors and connect the Boost‑A‑Pump wiring.
  5. Reassemble the intake track, reinstall the throttle body, and connect all vacuum lines.
  6. Flash the custom ECU tune (provided on a handheld tuner or via email from a tuner like Jay Greene).

The most time‑consuming step is removing the factory intake manifold — a process that requires careful disconnection of wiring harnesses and coolant hoses. First‑time installers report 12–16 hours total. Professional installation typically takes 8–10 hours.

Alternatives to the Roe Racing Supercharger

While Roe Racing is the most popular bolt‑on option, other forced induction systems exist:

  • ProCharger / Vortech centrifugal supercharger: These bolt‑on blowers offer higher peak horsepower (up to 700 hp) but have more lag and require more plumbing. They are better for high‑speed pulls than low‑end torque.
  • Turbocharger kits (e.g., Hellion): More expensive and complex, but capable of 650+ whp. Turbo lag is noticeable, and heat management is trickier.
  • Whipple or Magnuson top‑mounted blowers: Similar to Roe Racing, but often designed for the Ram 6.2L or 6.4L. Fitment on the 5.7L requires adapter plates.

For the balance of instant response, ease of installation, and proven reliability on the 5.7 HEMI, the Roe Racing kit remains the gold standard.

External References and Further Reading

To validate the numbers and learn more, refer to these authoritative sources:

These resources provide dyno sheets, owner testimonials, and technical guides for anyone considering the upgrade.

Conclusion: The Supercharged Ram 1500 Is a Different Beast

The transformation from a stock Ram 1500 5.7 HEMI to a Roe Racing supercharged version is nothing short of dramatic. The benchmarked 0–60 improvement from 6.4 seconds to 4.2 seconds, and quarter‑mile drop from 14.8 to 12.9 seconds, demonstrate that a full‑size pickup can actually accelerate like a high‑performance sports car. More importantly, the everyday driving experience is vastly improved: instant torque, an intoxicating supercharger whine, and the ability to pass or merge with utter confidence.

While the investment of $9,000–$11,000 is not trivial, it delivers a power gain that no other single modification can match. With proper tuning, supporting upgrades, and regular maintenance, a supercharged Ram 1500 can remain reliable for tens of thousands of miles. For owners who want the ultimate street‑legal truck that still tows, hauls, and serves as a daily driver, the Roe Racing supercharger is a compelling, proven solution.