Lethal Performance boosts its Mustang GT project to 700 horsepower
By Steve Turner
You had to know this time was coming. When Lethal Performance gets its hands on a new Mustang project you know the mods are going to happen in a hurry. When it is a V-8-powered Mustang, you know that a supercharger is on the way, and the odds are it is one of the positive-displacement offerings from Whipple Superchargers.
â€œWe run Whipple Superchargers on our cars for many reasons. Most important, though, is the companyâ€™s kits make excellent horsepower and torque due to their twin-screw design, delivering instant boost. Thereâ€™s no waiting for the rpm to rise like the centrifugal blowers require. Just slam the pedal to the floor and you’re making power,â€ Jared Rosen of Lethal Performance explained. â€œOver the last 10 years we’ve also created a great relationship with the entire Whipple Supercharger family. They’ve always treated us like family and we feel the same way about them. So, if we’ve got a car that they have a kit for, you can bet we’re putting it on.â€
If you have been living under an engine block and you arenâ€™t familiar with the Whipple superchargers, these units are of the twin-screw variety that compress the air inside the supercharger and feed it into the engine. They are available in a variety of displacements, and as you might expect the bigger blowers deliver even higher levels of boost.
For the 2015 Mustang, Whipple has created a 2.9-liter supercharger based on its W175ax compressor. This unit features a front-feed and an integral bypass valve. If you are familiar with the prior Whipple Mustang systems, you know that they have featured a rear inlet and a front drive, but by moving the inlet to the front and driving the blower at the rear via a jackshaft, allowed Whipple to increase the plenum volume, reduce restriction, and add and additional 1.75 inches of intercooler coverage.
â€œThe new 2015 kit is very impressive. The front-feed design, huge intercooler, massive heat exchanger with optional fans, aluminum intercooler reservoir, and the race-ready belt system are just some of the things that stand out from the previous design,â€ Jared explained. â€œThe kit comes with everything individually bagged and labeled and includes a full-color installation manual. Itâ€™s amazing to see the thought process in designing a kit like this, as well as how many individual pieces it takes to make it complete. Kudos to Whipple for in my opinion its best supercharger kit so far.â€
These changes to the blower kit added up to a more efficient design, which should allow for a greater power production. Moreover, Whipple designed a completely new system for the 2015-and-up Mustang GT (PN WHP-WK-2620B; $8,295). It is a comprehensive and well-designed system that delivers and OEM-level of fit and finish. Better yet, the system includes an even larger heat exchangerâ€”60-percent larger than prior Mustang kitâ€”with the option of adding two SPAL 11-inch fans, which will deliver a constant supply of air over that heat exchanger, which handles 1.3 gallons of coolant.
Of course, what really matters to you is what this system will do for a 2015 Mustang GT. As such, we packed up our cameras and headed to Power by the Hour in Boynton Beach, Florida, to document the installation and testing of the all-new Whipple system for the S550.
â€œWeâ€™re extremely happy with the results of the kit. I remember putting the older 2.9-liter design on our 2011 5.0-liter and making around the 600 rear-wheel horsepower,â€ Jared said. Now weâ€™re above 700 rear-wheel horsepower, and we haven’t even started turning this thing up yet! I wonder what this thing will do at 20 psi with some E85?â€
Until they make that move, letâ€™s see how you can bolt 700 rear-wheel horsepower onto your new Mustang GT.