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.
“We run Whipple Superchargers on our cars for many reasons. Most important, though, is the company’s kits make excellent horsepower and torque due to their twin-screw design, delivering instant boost. There’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,” Jared Rosen of Lethal Performance explained. “Over 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.”
If you have been living under an engine block and you aren’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.
“The 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,” Jared explained. “The kit comes with everything individually bagged and labeled and includes a full-color installation manual. It’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.”
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 exchanger—60-percent larger than prior Mustang kit—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.
“We’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,” Jared said. Now we’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?”
Until they make that move, let’s see how you can bolt 700 rear-wheel horsepower onto your new Mustang GT.