General Challenger

  • Engine Dyno vs. Chassis Dyno

    What's the difference between running an engine on an engine-dyno, or, as installed in the car, on a chassis-dyno? Most chassis dynos extrapolate an engine's power and torque based on vehicle inertia. Many variables can affect chassis dyno results. It's a great convenient tuning aid, but you can't directly equate the reported torque and power numbers back to engine dyno results, or even the results obtained from two different chassis dynos. Operator experience is critical for obtaining...
  • Paddle shifters

    Paddle shifters, once exclusive to race cars and exotic sports cars, like the Ferrari F430, are now becoming commonplace on performance cars with automatic transmissions. This is because manual transmissions are going away faster than the landline telephone. Critics of automatics say that they take the passion and command out of driving. Paddle shifters, however, bring some of that joy and control back by allowing drivers to manually shift an automatic transmission with steering-wheel or...
  • How the EPA Tests Vehicles for Mileage

    Fuel economy for vehicles (city, highway and combined) is measured under controlled conditions in a laboratory using a series of tests specified by federal law.The results are displayed for the consumer on the "new car window sticker." Estimating MPG with Laboratory Tests In the laboratory, the vehicle's drive wheels are placed on a machine called a dynamometer. The "dyno" simulates the driving environment much like an exercise bike simulates cycling. Engineers adjust the amount of energy...
  • Li-Ion Batteries

    We are now entering the electric car age. These vehicles are powered by Li-Ion batteries. This type of battery is energy dense and durable. However, it can also be unstable and prone to catching fire under certain circumstances. But not all Li-Ion batteries are suited for vehicles. How Do They Work? Lithium ions store the energy by creating an electric potential difference between the negative and positive poles of the battery. Those are isolated using a separator material to prevent...
  • How does MDS Work?

    The following Motor Trend article, describes in detail, how the MDS system works. What Is Hemi MDS? (motortrend.com)
  1. Featured

    Modern Hemi Engines

    Modern Hemi production began in June 2002 at the Saltillo plant in Mexico. The first-generation 5.7 liter produced up to 350 horsepower at 5,600 rpm and 375 lb-ft of torque (4,400 rpm)- one horsepower per cubic inch- just like the legendary 426 Hemi. It was smaller, more powerful, and cheaper to build than the LA-series 360 V8 and the "Next Generation" 4.7 liter V8 it replaced, but produced more power and torque. It hooked up to the Mercedes 5-speed automatic, Chrysler's 5 and 6-speed truck...
  2. Mopar Engine Colors

    Automobile engines are usually painted bright colors, like red, orange or blue. This just isn’t for appearance. There is a practical purpose. Bright colors enable leaks to be spotted easily. Here is a list of engine colors (and paint codes) used by Mopar, from 1962 to 1971. Race Hemi Orange- Mopar P4120751 1962-1964 Max Wedge engines (413 and 426 Cross Ram) 1964-1965 426 Race Hemis Street Hemi Orange- Mopar P4349216 1966-1971 426 Street Hemis 1969-1971 High performance 383 and 440...
  3. Nitrous Oxide

    Juice. Squeeze. Laughing gas. Nitrous oxide has many aliases. It can inject a healthy dose of horsepower into an engine, via direct port, carburetor/throttle body plate, air intake tube or, air cleaner injection, to give a race car the winning edge at the track. In racing, nitrous oxide (often referred to as just "nitrous") allows an engine to burn more fuel by providing more oxygen than air alone, resulting in a more powerful combustion. The gas is not flammable at a low...
  4. Tstats and Engine Temperature

    As we all know, the main purpose of a thermostat (tstat) is to maintain your Challenger’s engine at the ideal operating temperature and help produce fewer emissions. First, let’s talk about how a tstat functions and then why racers install low temperature ones. Basically, the thermostat starts at a closed position when you start the engine to help it reach operating temperature. While the engine is running, the coolant temperature slowly rises, making the thermostat begin to open. The...
  5. Featured

    Seat Belt Technology

    A seat belt is a vehicle safety device designed to secure the driver or a passenger of a vehicle against harmful movement that may result during a collision or a sudden stop. A seat belt reduces the likelihood of death or serious injury in a traffic collision by reducing the force of secondary impacts with interior strike hazards, by keeping occupants positioned correctly for maximum effectiveness of the airbag (if equipped) and by preventing occupants being ejected from the vehicle in a...
  6. Mufflers

    Since the beginning of hot rodding, enthusiasts have tinkered with their car’s exhaust system, particularly the mufflers, to get the “right sound.” A muffler’s job sounds easy enough- reduce exhaust volume to tolerable levels while allowing the sweet sounds of your ride to waft through the air. But this becomes a monumental task as horsepower increases. Engines build horsepower by pushing spent exhaust out of the tailpipe as fast as possible. As pistons furiously churn, exhaust velocity...
  7. Featured

    Chrysler Corporation in World War II

    Many are unaware of the vital role played by Chrysler Corporation in World War II. As Mopar enthusiasts, we should all be proud of its outstanding war record. In 1939, the U.S. military was laughable. The Army's own chief of staff, Gen. George C. Marshall, ranked it 19th in the world- one spot behind Portugal- in a report to the president. Roosevelt was about to change that- and America- forever. Decades of isolation and a global depression had created a nation unresponsive to the world...
  8. Featured

    Car Salesman Tactics

    When buying a new or used car from a dealership, there are many pitfalls you must avoid. It must be remembered, you and the dealership have different objectives. You are trying to buy your vehicle as cheap as possible and it is trying to maximize its profits. Here are some of the common sales tactics that unscrupulous dealers may use: 1. The Hard Sell Buying a car is a big decision, so never make a purchase simply because you feel pressure from an overaggressive salesman. 2. Selling on...
  9. New LED's for my 2009 R/T. Pictures do not do it justice!

    Well I've been waiting around to win the lottery so I could afford some LED tail lights. So just for giggles I bid 400 bucks for a set on eBay and the offer was accepted. I ordered my three layer center decal in advance so I put it on before the lights. It was a little tall so I just trimmed it before I took off the paper. I always wanted a blacked out rear end but I never liked those covers that went over the stock lights of the 2008 through 2014. I purchased the smoke set and it does not...
  10. The Advantages & Disadvantages of Lowering Your Car

    Cars come with conventional-size and strength springs that help it deal with potholes and bumps on the road. Manufacturers have spent considerable time and money to come up with just the right suspension components. Nevertheless, it has become fairly common for car owners to modify their cars’ suspensions to make them ride lower. Usually aesthetics are one of the most important reasons for reducing ride height- many people prefer the appearance of a lower car- but there are other...
  11. Types of Tires

    Tires come in many treads, sizes and performance characteristics. Here is a primer on the basic car tire categories and some popular consumer choices. Extreme Performance Summer Hyper-focused on extreme dry grip, but gives up wet traction, comfort and tread life to get it. Not to be driven in near-freezing temperatures, in snow or on ice, or at high speeds in deep standing water, these specially tuned tires combine big-block tread designs with aggressive tread compounds and reinforced...
  12. Engine Dyno vs. Chassis Dyno

    What's the difference between running an engine on an engine-dyno, or, as installed in the car, on a chassis-dyno? Most chassis dynos extrapolate an engine's power and torque based on vehicle inertia. Many variables can affect chassis dyno results. It's a great convenient tuning aid, but you can't directly equate the reported torque and power numbers back to engine dyno results, or even the results obtained from two different chassis dynos. Operator experience is critical for obtaining...
  13. A Guide to Locking Lug Nuts

    Do you want to protect your wheels and tires from being stolen? The best security is locking lug nuts. These special wheel locks will help keep your wheels and tires safe even in dangerous neighborhoods or unlit parking lots. You’ll sleep better at night knowing that they will still be on your car when you wake up in the morning. Without a unique key, most thieves will be stopped in their tracks if they attempt to steal your rims and may move on to easier scores. Thieves are not only after...
  14. Superchargers vs. Turbochargers

    When designing an engine to pull in more than atmospheric pressure, engineers often turn to forced induction. It’s one of the fastest ways to add significant power to almost any engine, and there are two prevalent ways it can be done: supercharging and turbocharging. But, which is better? Both are different in terms of how they work, performance and cost. Both operate on the principle that the more air you can get into your engine, the more power your car will make. Supercharging is old...
  15. The History of Car Antennas

    Automotive antennas have evolved since their introduction in the 1930s. Once tacked on as optional equipment, they are now designed into the car as an indispensable accessory. Several different approaches have been used to improve performance while making the antenna attractive, including embedded windshield versions and electric hide-away styles. The First Antennas In the 1930s, car antennas were incorporated into the radio body, as most stations were in the AM band, which required a...
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