Patrick Tullock's Z06 street car makes a "comfortable" 730 rwhp
Corvettes have always inspired those who see them--none more so than the Vettes raced on road courses the world over during the last half-century-plus.
That includes the latest generation of race cars that Corvette Racing has campaigned (and won with) since 2005. They made such a big impression on Patrick Tullock that he built his '08 Z06 into a GT1-inspired "grand touring" car.
From a distance, Tullock had admired the purpose-built, "Jake"-graced racers, but it wasn't until a memorable show trip led him to see one up close. "I was at Corvettes at Carlisle when I met the gentleman who did the bodywork on the [C6.Rs]," he recalls. "They had one of the race cars there, and after speaking with him, I had more insight as to what he does. When I saw the build he did on that car, I just fell in love with it. So, I built my car that way."
Tullock started with a brand-new '08 Z06 hardtop--already a stout piece of equipment with its 505hp, 7-liter LS7 engine, six-speed transaxle, and giant disc brakes at each corner. For many Vette lovers, that's plenty right there--but not for Tullock. "I'd had the car for about a week when I decided I needed more power," he says. "I wanted to do a bulletproof engine that could go as high as 1,500 horsepower, if need be."
To that end, he enlisted MCP Competition Engines, whose Mike Tiedemann started by dumping the factory cylinder block and heads in favor of a GM Performance Parts cast-iron LSX block and LS7 six-bolt heads. With a solid foundation in place, he added a Callies "DragonSlayer" crankshaft, Manley H-beam connecting rods, and Mahle forged pistons to produce an engine good for more than the stock LS7's power figure--lots more, according to Tiedemann. "With that package, I've had guys push it up to about 900 rear-wheel horsepower, and it can handle quite a bit more than what he's sending through it."
But Tullock wasn't through upgrading his '08's powertrain. Next came Adam Brandt, and his expertise in installing and tuning superchargers on LS-series engines. On went a ProCharger supercharger, and into the Vette's ECM went Brandt's tuning expertise. (If Brandt's name sounds familiar, it's because his green, 1,000hp C6 appeared on the cover of our Sept. '10 issue.)
Tullock's newly blown Z06 produced 755 rear-wheel horses when it hit the dyno. "We could go to 20 pounds of boost if we run race gas, and it's probably capable of 1,000 horsepower," says Brandt.
Tullock adds, "Right now, I'm just running it at 13 pounds of boost. It's a spirited driver, but it's comfortable." (Yes, this is likely the first time the terms "13 pounds of boost" and "comfortable" have appeared in the same paragraph of a VETTE feature.)
For the body, Tullock turned to Advanced Composite Products (ACP) for the company's "ZRT" kit, which consists of a front splitter, a front tunnel undertray, a vented hood, louvered front fenders and rear quarters, special rocker panels, and a GM-designed rear wing--all engineered for maximum aerodynamic and aesthetic effect. ACP also added a carbon-fiber rear diffuser, plus carbon A-pillar covers and a "clear carbon" roof and halo, before coloring the body in two-stage DuPont Victory Red.
How's this "comfortable" C6 to drive? As Tullock puts it, "It's crazy--this car is super fast!"
Since it was finished last year, Tullock's Vette has been a good-weather driver and show ride. "I'm a member of the Afro-American Corvette Club (AACC), so I've been taking it to our meets," he says. "And I bring it to other car meets in the Long Island area."
If you're inspired by this blown Z06--or by the Corvette Racing C6.Rs that inspired it--Tullock has advice he shares with anyone who asks. "Do your research, and make sure you know who's working on your car," he says. "There are a lot of people out there who claim they know what they're doing. The end product is going to cost you a whole bunch of money, and you won't accomplish what you want if you don't do your research."
In Tullock's case, his inspiration and investigation resulted in a Corvette that's a true visual and performance sensation. vette
Right now, I'm just running it at 13 pounds of boost. It's a spirited driver, but it's comfortable.--Patrick Tullock
|Owner||Patrick Tullock; Elmont, New York|
|Block||GM Performance Parts LSX cast-iron|
|Heads||GMPP LSX six-bolt ported aluminum|
|Camshaft||Comp Cams hydraulic roller; 234/240-degduration, 0.610/0.624 in lift, 116-deg lobe-separation angle|
|Pistons||Mahle forged aluminum, 9.4:1 compression|
|Crankshaft||Callies DragonSlayer forged steel|
|Rods||Manley H-beam forged steel|
|Intake Manifold||Ported stock composite|
|Power Adder||ProCharger D-1SC supercharger with 13 psi max boost; installed and tuned by Optimum Performance, Bethpage, New York|
|Exhaust System||Kooks headers and 3-in head pipes, 5-in exhaust pipes|
|Transmission||Stock six-speed manual with MGW shifter|
|Clutch||GMPP ZR1 dual-disc|
|Suspension||Stock coil springs/unequal length A-arms, rear leaf-spring bundle, and Delco tubular shocks|
|Brakes||Stock cross-drilled 14.0/13.4-in rotors and six-/four-piston-calipers (front/rear)|
|Wheels||Swiss chrome-plated aluminum; 19x9.5 (front), 20x13 (rear)|
|Tires||Nitto Invo; 275/30ZR19 (front) 345/25ZR20 (rear)|
|Mileage||Approximately 3,500 (on current engine)|