The 2009 Mackinac ATX Sedan is an American Sport car. It can be bought for $173,990, and appeared in Ultimate Driving on 2018 Thanksgiving Update. It is based off the 2009 Cadillac CTS-V Sedan
The second generation CTS-V is based on the new GM Sigma II platform. The rear-wheel-drive platform is the basis for the 2008 to present Cadillac CTS base model with which the CTS-V shares most of the body work. The suspension features coil springs front and rear. The front suspension is a control arm arrangement while the rear is an independent multi-link suspension. To improve the handling and comfort, the 2009 CTS-V uses BWI Group's MagneRide technology. The dampers, filled with magnetorheological fluid, are adjusted based on sensor readings that happen at 1 ms intervals. The sedan has four-wheel disc brakes similar to the first generation. The front brakes were increased in size to 14.96 in (380 mm) ventilated discs with six piston Brembo fixed calipers. The rear brakes are 14.37 in (365 mm) ventilated rotors with four piston calipers. Steering is speed-sensing hydraulic-assist rack-and-pinion. The steering ratio is 16.1:1. Tire sizes are 255/40ZR19 front and 285/35ZR19 rear on 19×9.0 inch and 19×9.5 inch wheels front and rear.
The powerplant in the 2009 CTS-V is a supercharged 6,162 cc (6.2 L; 376.0 cu in) LSA V-8, based on the LS9 V-8 from the Chevrolet Corvette ZR1 (C6). It produces 556 hp (415 kW) and 551 lb⋅ft (747 N⋅m) of torque. The choice to use an pushrod engine (OHV) arrangement is unique in the luxury performance sedan market where competitors typically use dual overhead camshaft (DOHC) engines. The engine is produced in GM's Silao, Guanajuato, Mexico engine assembly plant. The LSA engine has a bore x stroke of 4.065 in × 3.622 in (103.25 mm × 92 mm). The engine block is cast aluminium 319-T5 alloy with cast iron cylinder liners. The crankshaft is forged steel using powdered-metal connecting rods. Pistons are high-silicon Hypereutectic Aluminium alloyreplacing the forged aluminum used in the LS9 engine. The compression ratio is 9.1:1. The cylinder heads are based on the Corvette's LS3 head and are cast from type 356-T6 Aluminum alloy. The exhaust manifolds are cast iron. The supercharger is a twin four-lobe screw compressor-type unit displacing 1.9 L (116 cu in). It is Eaton's Twin Vortices Series (TVS) generating a maximum boost of 9.0 psi (62.1 kPa). Intake air is cooled with a water-to-air intercooler built directly into the supercharger unit.