Hennessey Performance Engineering
Hennessey Performance Engineering is an American tuning house specializing in modifying sports cars from several brands including Ferrari, Porsche, McLaren, Chevrolet, Dodge, Cadillac, Lotus, Jeep, Ford, GMC, Lincoln and Lexus. Established in 1991 by John Hennessey, their main facility is located 45 minutes west of Houston, Texas in Sealy, Texas. The firm focuses on mechanical component modification for creating high-powered cars. Besides performance automobiles, they also tune pickup trucks and sport utility vehicles such as Ford Raptors and Jeep Grand Cherokees. They also work on luxury cars such as Bentleys and muscle cars like the Dodge  Charger and Challenger. Tuner School. In 2008, the Tuner School was founded by the company. It is a private institution dedicated to teach and train high performance vehicle tuner technicians. It is located at Lonestar Motorsports Park, near the Hennessey Performance headquarters. All instructors at this education facility are actual performance tuning mechanics. Notable cars. Hennessey Venom 650R. The Hennessey Venom 650R is one of the first offerings provided from the tuning company. Available as a package to the 1996 Dodge Viper GTS, the Venom 650R was one of the fastest road legal cars in the world. Upgrades included a  US$37,000 engine upgrade that utilised enlarged cylinder bores, and longer stroke to increase displacement from the stock to along with forged steel connecting rods (titanium rods were an extra $3,500) and forged aluminum pistons; the whole assembly was then balanced and blueprinted to bring the total power output to at 5,800 rpm and of torque at 4,500 rpm bumping the compression ratio up to 10.5:1. On the intake, a competition airbox feeds 70-millimeter billet throttle bodies and a port-matched intake manifold. On the exhaust, a set of tuned-length stainless steel headers sent spent gases back  to a 3.0-inch stainless exhaust system that retained the stock catalytic converters, but allowed them to be easily bypassed for track day performance. New engine management software increased the idle to 1,000 rpm, disabled the 1-4 skip-shift transmission feature, turned the cooling fans on sooner, and packed recalibrated fuel and ignition curves. Completing the package was the VenomAero carbon fiber body upgrade that reduced weight, added functional brake cooling ducts along with a rear wing and optimized downforce. All of these modifications allowed the car to accelerate from in 3.3 seconds, complete the 1/4-mile in 10.8  seconds at a speed of and propel the car to a top speed of over . A Brembo race spec braking system and a Penske adjustable suspension system with 30 variable damping settings were available as an option. The total cost of the package stood at US$108,500 excluding the price of a stock Viper GTS. Hennessey Venom GT. In 2010, Hennessey Performance revealed the Hennessey Venom GT. The Venom GT is based on the Lotus Exige and has a twin-turbocharged V8 engine that is rated at . The car weighs and has a top speed of . Three "World's Fastest  Edition" Venom GT coupés were produced in 2014 to commemorate the car's speed record run. A roadster variant dubbed the Venom GT Spyder was launched in 2012 on the request of Aerosmith lead singer Steven Tyler. It is based on the Lotus Elise and adds to the curb weight due to structural changes. The production of the Spyder was limited to five units with a one-off Spyder being produced as the "Final edition" model bringing the total to 6 units. The final edition gained a total of and was lighter than the regular Spyder. Hennessey Venom F5. The  Hennessey Venom F5, successor to the Venom GT, was unveiled at the SEMA Show in Las Vegas, Nevada, on November 1, 2017, with high expectations of its intended world-beating speed record, having a projected 2.0 second acceleration time and top speed. The Venom F5 features a bespoke proprietary 6.6-liter twin-turbocharged V8 engine, making this the company's first in-house engine. It is rated at and of torque. Pennzoil and Shell are partners with Hennessey for the project to help reach the top speed mark. The top speed is claimed to be through a V-MAX speed -tracking system. Hennessey predicts the car can accelerate from in a time of under 10 seconds and in a time of under 20 seconds. Only 24 will be built with each car costing US$1.6 million. VelociRaptor SUV/Off-Road Truck. The Hennessey VelociRaptor SUV is a luxury off-road full-size SUV modified from the Ford SVT Raptor. The SUV is limited to 30 produced a year, however since its introduction over 400 versions have been made. It uses the same engine Ford uses for the pickup truck version. The second generation version is a Luxury off-road heavy -duty SUV modified from the 2015 Ford Super Duty Lariat Version, with design cues from the Ford Excursion. As of 2015, the first generation model has been discontinued. In 2018 the Hennessey Ford VelociRaptor 6×6 option was made available, with a 30-inch extended frame and extra axle for a total of six driven wheels. Hennessey CTS-V. The Hennessey CTS-V is a 2016 Cadillac CTS-V tuned by Hennessey to produce 1000 horsepower. Hennessey Exorcist. The Hennessey Exorcist is an upgrade package for the Chevrolet Camaro ZL1 offered by Hennessy Special Vehicles. The package includes a high-flow  supercharger and intercooler providing 14 psi of boost pressure, custom camshaft, ported cylinder heads, upgraded valvetrain with new springs, lifters, pushrods and valves and long-tube stainless steel exhaust headers with high-flow catalytic converters. The cars equipped with the automatic transmission will require an upgraded transmission at the cost of US$9,950. The optional drag pack includes 315/30-20 rear tires, modifications to the drive shaft, floor jack and tool kit for faster acceleration at the drag strip at the cost of US$8,995. The optional road race pack includes a set of 20 inch light weight Hennessey wheels  with Michelin Pilot Sport Cup 2 tires at the cost of US$6,995. The upgraded engine with the standard package is rated at at 6,400 rpm and of torque at 4,400 rpm, enabling the vehicle to accelerate from in 3.5 seconds, complete the quarter-mile in less than 10 seconds and attain a top speed of , over that of the original ZL1. The package is available at an additional cost of US$57,455 over the cost of the standard ZL1 for both the manual and automatic versions of the car. The vehicle can directly be ordered from Hennessey Special Vehicles , Chevrolet dealers or the vehicle can be sent to Hennessey Special vehicles by the owners for conversion. Divisions. Hennessey Special Vehicles. Hennessey owns the Hennessey Special Vehicles division established in 2017, in which it builds the Hennessey Venom GT sports car line-up. The division is tasked to learn from its experiences with the Venom GT and apply it to the newest variation, the Hennessey Venom F5, which will succeed the Venom GT. All vehicles sold under the division are branded as a regular Hennessey model, despite being built by the division. Controversy. Hennessey has been the subject of numerous  lawsuits and Better Business Bureau complaints throughout the years, with many BBB complaints left unresolved and, according to court records, many judgements entered against Hennessey. Jalopnik published an article outlining Hennessey's many customer service and potential fraud issues.