Challenger Hellcat X
Patrick Rall's picture

Why the Dodge Challenger Hellcat X "Only" Makes 805hp

Since making its public debut two weekends back, the unique Dodge Challenger SRT Hellcat X has gotten plenty of attention with its twin-charged Hemi engine setup, but many people are asking why it “only” makes 805 horsepower and 800lb-ft of torque – which we examine today here on TorqueNews.
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Before getting into the details on the Hellcat X, let’s look at the fact that we are referring to this one-off muscle car’s output as being “only” 805 horsepower and 800lb-ft of torque. It is hard for many people to attach “only” to the description of a car with over 800 horsepower, but with the stock Hellcat Hemi offering at least 707 horsepower and 650lb-ft of torque, 805 horsepower and 800lb-ft of torque with an extra pair of turbochargers seems a little low.

Fortunately, there is a good explanation as to why the Challenger Hellcat X “only” has 805 horsepower and 800lb-ft of torque.

Hellcat X Packs “Safe Power”
When the first news snuck out of Carlisle, Pennsylvania that someone had built a twin-charged Hellcat Challenger that features both the stock Hellcat supercharger and a pair of turbochargers, muscle car lovers went crazy in speculating as to how much power the Hellcat X could offer. However, when the official details were announced with “only” 805 horsepower and 800lb-ft of torque, some critics questioned why the twin turbo setup added to the supercharger didn’t add more than 98 horsepower and 150lb-ft of torque

There are two important factors to consider when looking at the output of the Challenger Hellcat X. First, keep in mind that this is a car built for a charity giveaway, so while they wanted it to turn heads, the builders couldn’t invest a fortune into the car during the build and that brings us to the second factor. This is not a fully built engine – it is simply a stock Hellcat Hemi with a twin turbo setup applied to the factory supercharger setup. This means that when the turbochargers compress the air and send it to the engine, that air is first hitting the supercharger setup and when that air gets there, it is very hot.

The Hellcat Hemi supercharger is remarkable and it is a big part of the awesome power levels, but that supercharger is designed to take free flowing air and shove it into the engine. With the Hellcat X setup, the air reaching the supercharger is compressed so it is both denser and hotter. The more boost you add from the turbochargers, the more heat and pressure that will be applied to the top side of the Hellcat supercharger, so in keeping turbo boost pressures lower, the team can help to avoid excessive damage to the supercharger. Adding more boost with the turbochargers would have led to more power, but it would have also led to more abuse to the engine.

This means that the Hellcat X setup is safer than a twin-charged setup with twin turbochargers and a supercharger, but it also means that we aren’t seeing the massive power gains that we see from other twin-charging setups which use more aftermarket components.

Fortunately, even with “only” 805 horsepower and 800lb-ft of torque, the Dodge Challenger Hellcat X should be one wicked-fast muscle car. The chassis, brakes and suspension of the standard Hellcat Challenger are designed to make the most of the high stock power levels and the increases to 805hp and 800tq shouldn’t push the chassis beyond its capabilities – meaning that this Challenger should be able to use its power just as well as the factory-stock Hellcat Challenger.

So, if 805hp is enough for you and you would like a chance to win this gorgeous custom Dodge Challenger SRT Hellcat along with an equally gorgeous 1970 Dodge Challenger, head over to the Dream Giveaway website to buy your tickets!


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Comments

I am entering to win the giveaway
do i sound sick, combining the two challengers....1970 hellcatX? OK.
I now have the"worlds fastest crossfire" u-tube it so i want the worlds fastest Hellcat----jim
I love challengers. I rode in a 69 to school every day. The hell cat blows my mind GREAT JOB DODGE
That's interesting considering 1970 was the first model year of the challenger. Perhaps you rode in an early production '70 built in late '69?
This is a awesome challenger , I have always loved mopar but never in my life could afford a beauty like this as well as it's ancestor , but I would most likely donate one to children's hospital and enjoy the other , great job Dodge , I'm really impressed.
If you don't win the Hellcat-x, I have a 2015 Hellcat for sale. It is black-on-black, upgraded tires and wheels, and the acceleration will make your eyes bleed. Starting bid is $200,000.
$200,000 ? Your about $150,000 over on that price aren't ya , I gave 52,000 and worked my brakes and suspension , computer , tires and wheels . Which put my vehicle cost at 72,000 in all . But I would not get that in return if I was to sale my car .
This is what life is all about if you truly understand the physics behind a true American made muscle car that is state of the art technology!!! I would love to own this up to date street technology muscle car born from the Abyss of America's fascination with the Supernatural Cars of this era!!!
It's not American Made, the car is Made In Canada, and the Engine in Mexico, all Hemi's are Made In Mexico but the Transmision is made in the USA.
This is what life is all about if you truly understand the physics behind a true American made muscle car that is state of the art technology!!! I would love to own this up to date street technology muscle car born from the Abyss of America's fascination with the Supernatural Cars of this era This is a awesome challenger I am entering to win the giveawayI love challengers. I rode in a 69 to school every day. The hell cat blows my mind GREAT JOB DODGE im 15 yr old