There's no doubt we've been on an incredible roll of sorts, with a steady stream of '11-'12 Mustang tech articles here in 5.0 Mustang & Super Fords. While our aggressive pursuit of the latest hotness is in part credited to this magazine's title, we admit the experiments we're doing-especially those that involve increasing Coyote engines' horsepower output-can almost be likened to an addiction.
Some opportunities, such as cover exposes of both the Coyote 5.0 engine (Mar. '10) and its even-badder little brother, the '12 Boss 302's RoadRunner (Aug. '11), have come about thanks to good timing and the perfect alignment of the proverbial stars; others were made possible with the help of Mustang performance shops around the country.
For the sake of science (and marketing), shops have invested time and funds in exploring the performance potential of the newest Pony and its engine, progressing through the upgrade spectrum with a variety of bolt-on parts and improvement systems. Nelson Whitlock, Fred Cook, and their team at Evolution Performance are an ambitious Mustang-performance business. They're always ready (and willing) to try something new-especially if it's cutting edge and ultimately results in a stock 5.0 making unbelievable steam.
While we're of the attitude that no late-model 'Stang is so hallowed that it shouldn't be modified (case-in-point, upgraded '93 Cobras, Big Steve's PVT, and KJ's T-top coupe), we do acknowledge there are some enthusiasts who believe specialty cars should be left alone. However, we were presented with a chance to be the first Mustang magazine to have a go at supercharging a '12 Boss 302 Pony (number 127 of 4,000 cars being made), and as you'll see when you read this report, we really mean it when we say no 'Stang is "that sacred."
That's right-with the help of the teams at Evolution Performance and Kenne Bell, our latest effort involves implementing forced induction on the high-profile bad boy in Ford's 5.0 Mustang lineup. In this case, Kenne Bell's 2.8 Twin Screw is the air inducer of record, and Andy Caufield's bone-stock Boss is the testbed.
If you're saying to yourself, You guys have already tested the KB, yes, we have evaluated what the Mammoth can do on a stock Coyote. Contributor Tom Wilson worked with and reported on the unit for our May '11 issue ("Coyote vs. Condor"), and at 15 psi, the liquid-cooled Kenne helped churn 710 peak horsepower and 553 lb-ft of rear-wheel torque on an otherwise-untouched 5.0 Pony. Since RoadRunner 5.0s pack a lot more punch than their GT brethren, we're anxious to see what happens once the strong wind of a 2.8 Kenne starts blowing through its cylinders.
While the intake-manifold change in this effort is obvious, bolting the Mammoth twin-screw supercharger on a Boss 302 involves working around some of the blower system's installation instructions, as they were written for GTs long before our idea for this particular stunt came about. This being the case, we turned to Evo top wrench Chuck Wrzesniewski and calibration ace Jon Lund to put all the pieces in place and pour on the coals come dyno time.
It's time to get on with our feature presentation, which includes photo highlights of the install and the all-important rundown of our test Boss's rear-wheel performance on the Mustang chassis dyno at Evolution Performance.
Horse Sense: While being present when a Coyote 5.0 engine wails at 7,000 rpm during a dyno session is exhilarating, listening to a Boss version sing at high revs is something that can only be described as something that is truly out of this world. Video clips from this landmark project are on our website (www.50mustangandsuperfords.com). Click on one, then close your eyes and enjoy the experience.
Nicknamed RoadRunner, Boss...
Nicknamed RoadRunner, Boss Mustangs’ 302ci engines are unique in their internal makeup (CNC-ported heads w/bigger valves, higher-lift exhaust cams, forged crankshaft, pistons and rods) despite having the same cubic-inch displacement as the Coyote 5.0s of Mustang GTs...
...The Boss 302 intake manifold—which...
...The Boss 302 intake manifold—which features each vehicle’s serial number—stands out as the big external difference between the two bullets.
This is the parts assortment...
This is the parts assortment that comes with a Kenne Bell 5.0 Mustang supercharger system. Leading the collection is KB’s 2.8 Mammoth (despite this name, the 2.8 is the smallest blower in the Mammoth family) Twin Screw. The all-billet piece features 4x6-inch rotors and liquid (water) cooling for lower inlet-air temperatures and to help keep the blower’s bearings, rotors, and other internals happy when boost reaches the 18 psi we’re anticipating in our test. We’re trying an assortment of steel blower pulleys in this effort, starting with a 4-inch wheel and working down to a small 3.25-inch piece that should make things interesting.