At what point can we consider a C6 Z06 a "sleeper"? Step inside.
What happens when you take one of the best performance cars on the road, and make it better?
John Horney of Acworth, Georgia decided to find out. After only putting one hundred miles on the stock LS7, John decided to pull out the 'wimpy' 505 hp engine and replace it with a C5R race case. But, that wasn't enough. The race-designed block was taken to Garry Grimes in Alpharetta, GA and completely overhauled. A Moldex billet 3.75" crankshaft was added, reducing the cubic inches to 400. JE forged pistons with ceramic coated tops and teflon coated sides reduced the compression ratio to 8.5:1. Custom Carrillo forged connecting rods swing all eight hammers inside the block. The ported C5R cylinder heads were assembled with custom titanium valves, custom T&D shaft mounted rockers, and custom Isky high lift valve springs. They flow "
upwards of 400 cubic feet of air per minute", says Grimes. The cam specs are classified but we were told that the lift is in the 700s. Helping the motor breathe is a custom 90mm intake manifold made by Hogan Fabrication and a CNC ported and polished 90mm throttle body.
The finished motor was then put into the "Yellow Car" and hauled to Atlanta Performance & Fabrication (ATLPF.com). This is where the fun began. A custom twin turbo kit was designed for the 400 cubic inch C5R block. Twin 76mm Turbonetics ball bearing turbos force feed air into the motor. A custom air to water Bell intercooler was made to keep temps in check. The equal length 1-3/4" ceramic coated exhaust manifolds were made in-house. Adel Wiggins clamps hold all of the custom piping together and insure that the system is 100% leak-proof. Sixteen 60 pound Mototron injectors, four Bosch 044 fuel pumps, and a Split Second injector controller help dump fuel into the beast.
The stock transmission was sent to RPM Transmissions (RPMtransmissions.com) to get hardened gears, synchros, steel blocker rings, and a hardened 4340 output shaft. The rear end was also sent to RPM to get a cryo-treated 3.15 ring and pinion gear, hardened 4340 300M alloy steel output shafts, and a rear end brace and mounts. The Mcleod twin-disk race clutch helps put the power to the ground.
Enough about the specifications, how much power does this thing make? At only 8 psi of boost, with 93 octane, it put down a hefty 835 rwhp / 673 rwtq. At 18 psi, powered by Sunoco GT Plus 104 octane race fuel, it made an astonishing
1265 rwhp / 1103 rwtq and POW! it blew out the right rear tire!
The car has not been back on the rollers since, but Will and John of Atlanta Performance stated, "
it can easily make 1500 horsepower to the tires." Will told us that "
the car is a blast to drive. It'll spin the tires on the highway at three-digit speeds."
Although the car has never seen a dragstrip, John Horney said that he will be taking it to the Miami Mile in April of this year to find out how fast it can really go. We don't think a mile will be long enough to really see top speed!
Photoshoot | Super Mega Big Yellow Z06
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Originally Posted by UpSideDownDesi
