Have you ever second-guessed buying a car because you knew you couldn’t resist the constant need to modify it? Probably not, but project cars have a funny way of beginning with modest intentions and spiraling into mega-powered machines. If there was ever a classic example, it is Walter Stietzel’s ProCharger-equipped 2016 Mustang GT, which recently made its quickest drag strip pass thus far — an 8.07 seconds at 172.34 mph.
Making a 7-second ‘street’ car is never easy regardless of what you bring to the table… — Ken Bjonnes, Palm Beach Dyno
That’s an impressive number for any performance vehicle, but considering this stallion is still street-capable with a single centrifugal blower boosting its fortified Coyote engine, it is downright stunning that it is running into the single digits where only dedicated race cars once dared to tread.
Currently powered by a BES Coyote engine fortified with a full array of upgrades (see mods sidebar) and boosted by a ProCharger F-1A-94, Walter’s 2016 Mustang GT pumped out more than 1,272 horsepower and 876 lb-ft of torque at the wheels through the old 6R80 transmission. He hasn’t been back to the dyno with the new, more efficient air-to-water intercooler TH400 automatic arrangement, but the car runs 10 mph faster, so he is confident it currently exceeds 1,300 horsepower, which is enough to propel this S550 to the precipice of 7-second elapsed times. (Photos courtesy of Walter Stietzel)
“This car was my daily driver, and the goal was for it to be a 10-second daily,” Walter told us. “As modifications progressed, the car performed exceptionally well with each phase, making the next level come much quicker than anticipated.”
Having previously owned a turbocharged SN-95, he bought this car with a ProCharger P-1SC underhood and was excited to put his foot to the floor with the new combo, as he believes the company’s Stage 2 kit is an “awesome setup” for the 2015-and-newer Mustangs.
In that configuration, it ran 11.30 at 127 mph, but after a call to Ken Bjonnes at Palm Beach Dyno, it didn’t take long for the car to drop into the high 10s. Ultimately, it ran a 9.80 at 141 with P-1SC, 93-octane fuel in the tank, and a Circle D torque converter in the 6R80 six-speed automatic transmission.
“Having a properly built car is the key component beyond the main power adder. So many customers fail to realize this, but Walter is extremely detail-oriented and makes my job as easy as possible,” Ken…
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