Tag: Hennessey

  • Hennessey Venom F5 hits 200 mph during aerodynamics testing

    The first of three phases of testing for the Hennessey Venom F5 is complete ahead of the supercar’s planned public debut at the Amelia Island Concours d’Elegance in May. Hennessey announced Tuesday that a test car hit 200 mph during aerodynamics testing.

    That speed—achieved on a 2.2-mile runway at a former United States Air Force base in Arkansas—is about two thirds of the Venom’s claimed 311 mph top speed, but this test wasn’t about breaking records. The team, headed by chief engineer John Heinricy, were focusing on mid-speed refinement and coast-down behavior, a Hennessey press release said. Heinricy spent many years at General Motors, including as assistant chief engineer for the Corvette.

    The Venom F5’s 6.6-liter twin-turbo V-8 was also restricted to 900 hp, only about half its target output of 1,817 hp. With the taps fully opened, Hennessey claims the V-8 will also produce 1,193 lb-ft of torque, and rev to 8,500 rpm (although it’s restricted to 8,200 rpm outside a special F5 mode). Power is handled by a CIMA 7-speed single-clutch automated manual transmission.

    In addition to the unused Air Force base, the testing program has included stops at Hennessey’s own Sealy, Texas, site and England’s Silverstone circuit, where the first of 24 Venom F5 supercars was built. The next phase of development will include road testing and more track time to refine the car’s agility, poise and driver feedback. Testing sessions will take place at Laguna Seca and Circuit of the Americas (COTA), according to Hennessey. There is no word yet on the focus of the third phase of testing.

    Hennessey Venom F5 aerodynamics testing

    Hennessey Venom F5 aerodynamics testing

    The names “Hennessey” and “Venom” may sound familiar, but the Venom F5 is a different car than the 265-mph Venom GT, and it’s built by a new company called Hennessey Special Vehicles (HSV), which is separate from Hennessey Performance Engineering’s modification business.

    As with the Venom GT, though, Hennessey is looking to break the production-car land-speed record, this time by blowing past 300 mph. The company previously said it was considering a top-speed run on a closed section of Texas highway in 2021, using a customer car.

    Hennessey said last December that 12 of the 24 build slots were taken, with eight going to customers in the U.S. Those buyers will have to register their cars under the “Show or Display” rule, just like the McLaren Speedtail.

    Pricing has climbed since the Venom F5 styling buck was unveiled in 2017. At the time, Hennessey quoted a $1.6 million price tag, but that rose to $1.8 million for anyone who hadn’t locked in an order by January 2020. It’s now $2.1 million for the remaining build slots.

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  • 2021 Ram 1500 TRX strapped to dyno, puts out 583 hp at the rear wheels

    The 2021 Ram 1500 TRX boasts a factory-quoted 702 hp and 650 lb-ft of torque, but that’s as measured at the crank, not the wheels. Hennessey Performance Engineering tried to measure how much power the TRX makes at the wheels by strapping one to a dyno, but only ran numbers for the rear wheels.

    The dyno test showed 538 hp and 570 lb-ft of torque at the rear wheels. That represents around 17% driveline loss, which isn’t unusal for a pickup truck. Hennessey previously recorded 20% driveline loss at the rear wheels when it tested a 2019 Ford F-150 Raptor.

    The TRX is full-time four-wheel drive, so you might be wondering how Hennessey got dyno results for the rear wheels only. Company founder John Hennessey told Motor Authority that four-wheel drive was temporarily disabled by disconnecting the front driveshaft.

    2021 Hennessey Mammoth 1000 1500 TRX

    2021 Hennessey Mammoth 1000 1500 TRX

    While the TRX was designed for off-roading, the amount of power produced by its 6.2-liter supercharged Hellcat V-8 makes this truck pretty quick on pavement. Ram says it will do 0-60 mph in 4.5 seconds.

    Inevitably, that wasn’t enough for Hennessey. The company has developed more powerful versions of every Hellcat-powered vehicle, and it’s doing the same with the TRX. Dubbed the Mammoth 1000, Hennessey claims its take on the TRX will boast 1,000 hp, will do 0-60 mph in 3.2 seconds, and run the quarter mile in 11.4 seconds.

    To achieve those numbers, Hennessey plans to equip the Mammoth 1000 with an upgraded supercharger, pulley, and air intake, stainless-steel headers, high-flow exhaust piping (retaining the catalytic converter), and new engine mapping. The price for the complete truck is $135,350, and Hennessey only plans to build 200 this year.

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