The Dodge Challenger and Charger Hellcat models are legendary for their staggering factory horsepower figures. However, when it comes to Stock Hellcat Hp, the numbers thrown around can sometimes be misleading, especially when viewing dyno results. It’s crucial to understand that not all dynos are created equal, and certain practices can artificially inflate horsepower readings. Let’s delve into what you can realistically expect from a stock Hellcat in terms of horsepower at the wheels (rwhp).
Dyno Dynamics vs. Dyno Jet: Accuracy Matters
One common misconception arises from the type of dyno used. Dyno Jet dynamometers are frequently used, but they are often criticized for providing optimistic horsepower figures. Furthermore, some operators utilize the outdated STD correction factor, which further elevates these numbers. Claims of a stock Hellcat putting down 670 rwhp on such dynos are simply unrealistic. To achieve that level of wheel horsepower, the engine would need to be producing around 830-840 horsepower at the crankshaft, far exceeding the factory rating.
Understanding Drivetrain Loss in Hellcats
A crucial factor in understanding stock Hellcat HP at the wheels is drivetrain loss. Mopar experts estimate that Hellcats experience approximately 20% loss of power between the crankshaft and the rear wheels. This might seem high for a rear-wheel-drive car, but considering the robust components, including the supercharger and heavy-duty drivetrain needed to handle the Hellcat’s power, this figure is reasonable. Applying this 20% loss to the factory-rated 707 horsepower, we arrive at an expected wheel horsepower of around 565 rwhp (707 hp – 20% = 565.6 rwhp).
Real-World Dyno Results on Accurate Dynos
To get a clearer picture of stock Hellcat HP, it’s essential to look at results from more accurate dynamometers like Dyno Dynamics. One Hellcat owner tested their vehicle on a Dyno Dynamics dyno and recorded 572 rwhp. This figure translates to approximately 715 horsepower at the crankshaft, aligning closely with the factory 707 hp rating and considering potential slight engine variations. Interestingly, another stock Hellcat, a 6-speed manual, tested on the same Dyno Dynamics dyno just weeks prior, achieved a very similar result of 570.5 rwhp. These consistent results on a reputable dyno reinforce the expected range for stock Hellcat HP.
Stock Hellcat Performance at the Drag Strip
Real-world performance at the drag strip further validates these dyno findings. The same Hellcat owner who dyno-tested their car achieved an impressive 11.3-second quarter-mile at 126 mph in completely stock condition. Adjusting for sea-level conditions, this translates to a potential high 11.1-second pass at over 127 mph. This level of performance surpasses even SRT’s professional driver’s initial stock Hellcat times, suggesting the car was performing slightly above average. This real-world data supports the estimated 715 crank horsepower figure derived from the Dyno Dynamics test, further confirming realistic stock Hellcat HP numbers.
Realistic Stock Hellcat Horsepower Range
While the factory rating is 707 horsepower, manufacturing tolerances and slight variations between engines are expected. SAE standards allow for a small variance, potentially around 2%. This means that most stock Hellcats likely produce between 705 to 719 horsepower at the crank. When measured on accurate dynos, this translates to a realistic stock Hellcat HP range of approximately 564-575 rwhp. Therefore, when evaluating stock Hellcat HP, focus on dyno results from accurate equipment like Dyno Dynamics and be wary of inflated numbers from less precise dynos or outdated correction methods. The true power of a stock Hellcat is undeniably impressive and consistently delivers in the real world, aligning with these realistic dyno figures.
