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Dodge Demon's A/C helps its supercharged Hemi make more power

Staying cool is one important key to performance. Simply, more air means more power, and cool, dense air is better than hot air. While forced induction might help make copious amounts of horsepower, turbos and superchargers produce heat. Intercoolers help, but the new Dodge Demon and its supercharged Hemi need a bit of an extra boost. In Drag Mode, the Demon's engine commandeers the car's air conditioning system to help chill things out. The Demon will have the first production application of a liquid-to-air charge air cooler chiller system. Literally, the car's air conditioning system is used to cool the air going into the engine, dropping temps by up to 45 degrees Fahrenheit. Dodge claims the system helps achieve "temperatures previously unattainable by pressure-charged street-legal production vehicles." As cool as this may sound, the technology isn't new. Ford had a prototype system in the early 2000s called SuperCooler, though that system never made it to production. While the Demon's system doesn't have a super cool name like the one from Ford, the pair essentially work in the same way. In theory, it should have the same effect as a bottle of nitrous. According to Autoweek, Ford's system bumped up the output of the F-150 Lightning by about 50 horsepower. Turns out that air conditioning isn't always a huge power suck. Related Video:

Hellcat no help to Fiat-Chrysler's bottom-of-the-pile mpg average

What, you expected the "fastest muscle car ever" to help fleetwide fuel economy? Nope, don't think that's going to happen. That means Fiat Chrysler will likely to continue to languish at the bottom of the heap when it comes to fleetwide fuel economy among the largest automakers serving the US, especially as the automaker starts to sell its Dodge Challenger SRT Hellcat. A few hundred Fiat 500E electric vehicles aren't going to turn the trend around. See, Chrysler has once again finished at the bottom of the list when it came to fleetwide fuel economy among automakers for 2014 model-year vehicles, according to a preliminary study by the US Environmental Protection Agency. Chrysler and Fiat had an average of 21.1 miles per gallon. That substantially lagged the overall 24.2 mpg average, but it was an increase from the company's 20.9 mpg average last year and the 20.1 mpg average two years prior. For 2014, General Motors had the second-worst fleetwide fuel economy at an even 22 mpg. Fiat Chrysler does say it's working on improving its fuel economy, according to Automotive News. The company plans on making its inline-four-cylinder and V6 engines smaller, and will sell more vehicles with eight- and nine-speed transmissions. Heck, there's even a plug-in hybrid version of the Chrysler Town & Country minivan in the works for late 2015, and the company can tout fuel-efficiency gains with the Chrysler 200 and Jeep Cherokee. We would be remiss if we didn't note that, compared to its muscle-car forefathers, the Hellcat actually performs pretty well at the pump. Last month, word got out that the 2015 Challenger Hellcat, equipped either with a six-speed manual or an eight-speed automatic transmission, got a combined fuel economy of 16 mpg. Heck, the automatic-tranny version got 22 mpg on the highway. And that's for a car with 707 horsepower and a 10-second quarter-mile time. Still, with the pedal floored, the car can burn a gallon and a half of fuel per minute. Ouch.

Hellcrate 6.2-liter V8 delivers plug-and-play Hellcat hype to SEMA

SEMA just provided another entry for the folder marked "What A Time To Be Alive," with Mopar's announcement of the "Hellcrate" 6.2-liter supercharged Crate HEMI engine. Enthusiasts have been desperate to upgrade their vintage rides with the woozy thrills provided by Dodge's Hellcat motor, so Mopar answered. The Hellcrate engine assembly ships in plug-and-play configuration, in specially designed packaging with "Hellcrate" logos. The assembly sells separately from the Hellcrate engine kit, the kit adding a powertrain control module, power distribution center, engine wiring harness, chassis harness, accelerator pedal, ground jumper, oxygen sensors, charge air temperature sensors, and fuel pump control module. The PCM comes programmed with the production-car engine's 707 horsepower and 650 pound-feet of torque. An optional front-end accessory drive kit contributes peripherals like alternator, power steering pump, belts, and pulleys. Don't bother trying to lash up a sleeper 1997 Chrysler Sebring, though; Mopar tuned the Hellcrate for pre-1976 vehicles and manual transmissions. The engine assembly retails for an MSRP of $19,530, and the kit wants a further $2,195. Mopar didn't announce pricing for the accessory drive kit. The engine and kit come with a three-year, unlimited-mileage warranty when bought together. The Mopar Hemi Crate website will be happy to take your orders as of now. For help envisioning the possibilities, stop by Fiat Chrysler's 15,345-square-foot SEMA booth to check out the Limelight Green, Hellcrate-powered 1970 Plymouth Superbird clone worked up by Mark Worman of Velocity's " Graveyard Carz." While you're there you might as well peep Worman's encore, a 1968 Plymouth GTX stuffed with Mopar's 392 Crate HEMI in place of the original 440 big block, and the 1937 Dodge pickup that swallowed a Mopar 345 Crate HEMI. Mopar's come a long way from its original product: antifreeze products. Tomorrow it'll be Jeep's turn to ring the SEMA bells, once the noise dies down from the Mopar-jacked Wrangler Switchback, CJ66 and Jeep Shortcut. You can watch the brand's presentation online at 7:26 p.m. ET/4:26 p.m. PT. Until then, we're going to work the angles on a Hellcrate-powered Plymouth Volare. The sedan, naturally. Because we're practical. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.