Jerry Heasley
March 1, 2009
In this current phase of the twin-turbo Cobra's buildup, Jamey didn't build his Mystichrome Cobra specifically for the dragstrip. However, he still built a suspension to handle the horsepower and provide as much room as possible for the extensive turbo piping. The QA1, tubular front suspension improved handling, reduced weight over the steering wheels, and allowed for the much-needed clearance with the turbo pipes.

Terminator was Ford's internal code name for the in-development '03-'04 Cobra. These supercharged Snakes are popular, but not because of that nickname. The Cobras are fast, and easily become faster. With such easy horsepower gains from bolt-on parts and upgraded power-adders, the slippery slope to power madness is an easy one to slide down. Jamey McClellan of Borger, Texas, did just that when he took his '04 Cobra to what he calls "a whole new level of seriousness."

Like many other Mustang fanatics, Jamey has owned a stable-full of Ponies since the early '90s, ranging from his first, an '85 Mustang GT, which he still owns and races, to several Fox-body GTs, LXs, and an S-Trimmed '96 Cobra. The Mustang that really got his attention was the '04 Cobra in Mystichrome. The fusion of cobalt blue, topaz green, royal purple, and onyx black mesmerized the young man five years ago at the Mid-America Ford and Shelby Performance Convention in Tulsa, Oklahoma. While walking around a convertible version of the car at least a dozen times to watch the colors change, he knew he had to have one.

When he realized that dream, the modifications began immediately. Jamey learned of Stiegemeier Engine Airflow in St. Charles, Missouri, which ports superchargers, like the Eaton on the '04 Cobra. "If a customer could spin a dyno up to 500 hp with one of the company's port jobs on the '03 or '04 Cobra," Jamey says, "Stiegemeier would send out a free T-shirt."

Jamey took them up on this offer for extra power and the chance to enhance his wardrobe. After porting work and with the addition of a Mac Pro Chamber, Magnaflow after-cat, K&N FIPK, 2.93 upper pulley, 4-pound lower pulley, and a custom tune, the 4.6-liter DOHC turned in dynamometer results of 550 hp and 560 lb-ft of torque. Needless to say, Jamey scored a new T-shirt. A week later, he gave new meaning to the term Terminator. He burned up the No. 2 piston in the 4.6-liter.

An H.O. Fibertrends 4-inch cowl hood not only allows clearance for the monster 5.4's Sullivan intake setup and the turbo's inlet piping, but also gives the stance of the lowered twin-turbo Terminator an even more sinister look. The shortened antenna improves what Jamey call the "radio-tower-tall, stock-height antenna."

Jamey blames himself for the meltdown. The EGR lines that flow back into the inlet on the supercharger ingested motor oil and killed the fuel's octane. Denotation burned up the motor. Jamey should have installed an oil separator, which acts as a trap to extract the oil mist out of the EGR lines. He was looking to rebuild the stock Cobra motor when he came across Jim Napier of Turbo Horsepower in Albuquerque, New Mexico.

"He offered me a deal I couldn't refuse on a Modular Mustang Racing-built Lincoln Navigator, DOHC, 5.4-liter V-8. After I bought the engine, we started talking about turbo combinations," Jamey explains. With 50 additional cubic inches over the Terminator's stock 4.6-liter and twin turbochargers, Jamey figured he had a shot at a 1,000hp street car. This was his new goal, this time without the incentive of another T-shirt. Asked why he set the bar at 1,000, Jamey answers, "Why not?" Indeed.

After the supercharger adventure, Jamey was seemingly excited to try turbos. He called them "the most efficient power-adder on the market, with no bottles to refill or blower belts to slip." This time, he made sure to install breathers to keep the oil far away from entering the combustion chambers. Jamey learned this lesson the hard way with the blower. At 10 pounds of boost, the 5.4's first dynamometer run yielded 679 hp and 596 lb-ft of torque at the rear wheels.

Of course, that was well below his goal. In search of bigger numbers, he started climbing the boost ladder from 18, 19, 21, and finally 22 psi. At around 21 psi, the twin-turbo 5.4 experienced difficulties with the spark blowing out. The engine didn't die; it would fade off. In the graphs, the big modular showed a smooth curve in the horsepower and torque until the rpm approached 5,500. At that point, the skyrocketing horsepower and torque curves became erratic, indicating the loss of spark.

Jamey loves the stock interior. He says the Special Vehicle Team worked with Ford's color and trim director to develop the paint and leather. Using a process pioneered by Garden State Tanning of Southfield, Michigan, Mystichrome was applied to the leather inserts of the front and back seats, along with the steering wheel. That's a wild process. "The interior is pretty much stock because I really don't feel the need to upgrade on it, as sick as it is. I just added some extra gauges in the interior for boost, and the wide band air/fuel gauge. When someone walks by the car and raves about the paint, I open the door and show them the interior to really blow their minds."

Finally, at 22 psi, with the spark blowing out, Jamey saw the dyno hit 954 hp at 6,800 rpm and 742 lb-ft of torque at 6,400 rpm. Unfortunately, the dyno tech had to cut the session short, leaving no extra time to pull the Autolite 103 plugs and close the gap from 0.030 to 0.020 inch and achieve the 1,000 hp goal. Jamey blames the spark issue and pig-rich air/fuel ratio for barely missing his 1,000hp target. He views hitting this figure as merely a formality as he tinkers with the street tune.

5.0 Tech Specs

Engine And Drivetrain

Block
MMR-prepped 5.4 Lincoln Navigator

Bore
Stock 3.55-inch

Stroke
Stock 4.17-inch

Displacement
330ci

Crankshaft
Factory forged Lincoln Navigator crank

Rods
JE forged I-beams

Pistons
JE forged

Compression Ratio
9.7:1

Cams
MMR custom turbo grinds

Cylinder Heads
MMR-ported Lincoln Navigator 32-valve DOHC heads

Intake
Sullivan Performance single-plane intake and throttle-body adapter

Throttle Body
Stock

Mass Air
Ford Lightning 90mm

Power-Adder
THP twin-turbo kit, Precision T-4 67mm turbochargers with 0.68 A/Rs

Fuel System
D'Agostino Racing's MagnaFuel 1,500hp, return-style fuel system; MagnaFuel ProTuner 750 series fuel pump; -10 AN supply and -8 AN return line; Sullivan Performance fuel rails; and Siemens Deka 83-lb/hr, high-impedance injectors w/adapter harnesses

Headers
THP custom headers w/3-in up-pipes

Exhaust
3-in downpipes, 3-in custom X-pipe, and 3-in DynoMax Ultra-Flo mufflers

Transmission
Stock T56 with Liberty 26-spline input shaft and MGW short-throw shifter

Clutch
Spec Super Twin

Rearend
Stock 8.8 IRS w/3.55 gears

Electronics

Engine Management
Stock EEC-V, with Boost Performance DiabloSport tune and DiabloSport MAFia

Ignition
Weapon-X XCOP coils, Autolite 103 spark plugsBoost Controller
Greddy Profec B Spec II

Gauges
Dual-gauge instrument cluster bezel, Dynojet wideband A/F gauge, and Auto Meter NV boost gauge

Chassis And Suspension

Front Suspension

K-Member
QA1

Control Arms

QA1

Springs
QA1 coilovers

Struts
Stock

Caster/Camber
QA1

Brakes
Stock

Wheels
True Forged Victory Series
19x9-in

Tires
Nitto Invo 255/35R19

Rear Suspension

Springs
H&R Sport Springs

Shocks
Stock

Control Arms
Stock

Brakes
Stock

Wheels
True Forged Victory Series
19x10.5-in

Tires
Nitto Invo 285/35R19