Twin Turbo Terror

Conversion Brings Big Horsepower

Joe Greeves - June 06, 2014 02:20 PM

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ImageJoe Greeves
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      Twin turbos have been added to Mustangs before, but it is certainly the road less traveled. That was reason enough for Carl Vasile of Port Orange, Florida to choose this approach.
      He found a damaged 2007 Mustang at an auction in Virginia. It didn’t take long before he discovered the huge variety of customizing and performance options available through the aftermarket. His "Garrett Twin Turbo Edition" took shape simply because he had never seen anyone else do that.
Garrett had displayed a twin turbo car at the 2005 SEMA show and the literature on the conversion convinced Carl that it was a job he could handle. While the kit established the basics for the 2005 engine, lots of things were different on his 2007.
      Using the exhaust manifolds as a guide, the 48mm GT2781R turbos were positioned on both sides of the motor and create an awesome display. Routing all the piping inside the relatively tight engine compartment was the biggest challenge since Carl needed to accommodate an oversize CX Racing (two- into-one) intercooler, a 55-mm Tial Sport blow-off valve, a 63mm throttle body, and the 90mm PMAS 30T airflow sensor. The custom fabricated intake was fitted with a pair of K&N filters. With aspiration established, exhaust was next using a Ford Racing crosspipe, 2 ½-inch steel exhaust tubing, electrically operated cut outs, and stock mufflers. Fuel needs were upgraded, thanks to 47-pound injectors from Ford Racing and dual GT 500 fuel pumps.
      Once all the pieces were in place, fine tuning the list of new components was critical to ensure optimum performance without creating loud expensive noises. VMP Tuning in Deltona, Florida, dialed in the motor, reprogramming the computer and making a few adjustments to the basic system. When set at a conservative 15 pounds of boost and with electrically-activated open exhausts, the engine produces approximately 600 horsepower and 575 lb-ft of torque at 6,000 rpm. A slight increase in boost pressure will yield considerably more horsepower but with stock internals, Carl is very happy with the horsepower numbers from the dual turbo setup.
      Getting all that power to the ground was the next step. The car uses a stock Ford five-speed transmission, fitted with a Centerforce dual friction clutch kit capable of handling 700 lb-ft. A Hurst short throw shifter improves the look and design of the original, although Carl says it is still difficult to shift rapidly enough to keep up with the quick revving engine. The rear uses 3.53 gears but there is so much power that Carl may soon opt for a higher (lower numerically) gear set. He is also considering a beefed-up automatic transmission to refine the process even further.
      Amazingly, the conversion took just three short months. In that period, Carl also found time to add several distinctive body mods like the custom aluminum hood with Roush scoop, Roush front bumper, two-toned grille, side vent window covers, Eleanor wing, smoked lights, and probably the most distinctive addition to the exterior, the oversized 22-inch rims he found on the Internet. The combination of Ford Racing springs and GT 500 control arms ensure that the big wheels perfectly match the wheel wells.
      The final step was paint, with Carl spraying the Vista Blue himself. He also designed the custom white graphics, created by John at Starrco Auto Trim in Daytona Beach. The original theory behind those numbers on top of the graphics was a takeoff on the old approach used by the Oldsmobile 442. In this case, the "626" indicates 600 horsepower, dual exhaust, and a six-speed transmission. Carl’s original plan was to add the six-speed but soon realized that with all the horsepower in the car, even the five-speed had more gears than he needed!