Identical Twins: These Two Twin-Supercharged C7s Are Siblings

We recently highlighted a C7 Corvette getting the twin-supercharged treatment from Race Ready Garage in Ontario, Canada. The car was currently under construction for a customer when we did the story. As with all successful projects, the last bolt was torqued to spec and the car was completed. At that point, the question becomes, “Now what?”

Dave Rempel and his team at Race Ready Garage rightly assumed that if two ProChargers on a ZR1 are good, then TWO ZR1s wearing twin ProChargers must be better! That’s right folks, there is now, not only ONE ZR1 brandishing twin F-Series ProChargers under its factory hood, but Race Ready has just completed a SECOND ZR1! The second car does vary in color and is also a convertible, but it is still just as radical a build as the first car. Race Ready shared some video with us to prove they both are now up and drivable and report that both cars now have a few thousand miles on them in this configuration.

As you can imagine, designing and fabricating the entire supercharger mounting and drive system was a bit tricky, but by far, the largest hurdle was sourcing parts during the past two years. Dave reports the dual-supercharged system works flawlessly and both cars are “turn-key cars that anyone could hop in, start-up, and comfortably drive down the street.”

The Sebring Orange Z-car was still under construction when we first reported on the build. It is now a running car and has fostered a similar build of the blue ZR1.

Both cars feature ProCharger F1X superchargers pumping air into Katech CNC-ported LT5 heads. Keen eyes will notice complete sets of both hot- and cold-side plumbing, as well as lines for the Alky Control meth-injection to help keep things safe under boost, which is an anticipated 25lbs in the future. Both cars are running custom-tuned HPtuners’ unlocked E99 ECMs from the ZR1. There is also a Crawford Racing CR fueler that feeds the FIC 1000cc port injection for additional fueling. The direct-injection side is upgraded with Lingenfelter 27g/s DI injectors and LPE’s big-bore, high-pressure fuel pump. To help keep everything cool, a DeWitt’s radiator and cooling fan were added.

Since everything had already been designed, Dave and company at Race Ready Garage put together a SECOND twin-ProCharged ZR1 using all the lessons learned from the first build.

Since the factory-mounted supercharger is no longer necessary, a Late-Model Engines billet intake sits atop each of the custom-built and sleeved LT5 engines. If you look just before the billet starts, you’ll also see a Nitrous Outlet system squirting nitrous oxide into the engine. The future plans are to build matching 427 cubic-inch engines featuring many top-of-the-line forged internals, which Dave reports will be on the engine stands this winter.

Both cars are slated to get 427-cubed engines using all the right stuff this winter. As such, Dave has not turned the dial to eleven just yet, so horsepower numbers are forthcoming.

Beyond the engine, the second Z-car found itself treated to similar upgrades such as the Caravaggio custom interior, as well as exterior mods including a full-on color change. Both cars have their similarities but also stand apart in their overall design. The factory Sebring Orange paint on the pop-top helps disguise the car’s overall potential (at least as much as you can disguise a ZR1’s performance!) The blue-hued drop-top is striking in its matte finish, carbon fiber accents, and of course, that oh-so-ZTK high rear wing. As a touch to the two cars’ similar ancestry, the cars’ registration plates bear a familiar resemblance. That is more than a coincidence, as BOTH of these awesome cars are owned by one of Race Ready Garage’s customers! He is definitely one lucky man as few folks can attest to having two sets of twins in the family!

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About the author

Andy Bolig

Andy has been intrigued by mechanical things all of his life and enjoys tinkering with cars of all makes and ages. Finding value in style points, he can appreciate cars of all power and performance levels. Andy is an avid railfan and gets his “high” by flying radio-controlled model airplanes when time permits. He keeps his feet firmly grounded by working on his two street rods and his supercharged C4 Corvette. Whether planes, trains, motorcycles, or automobiles, Andy has immersed himself in a world driven by internal combustion.
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