Car Feature: Silver Sleeper

SILVERSLEEPER-5 copy

*photos by: Grant Cox Photography

Cadillac was once the standard of the world; a brand of prestige, elegance and excellence. Offering its buyers the latest technology, the most powerful¬†engines and luxury appointments that set¬†the brand to the highlest level of regard, Cadillac became a marque that everybody coveted. During the ’70s, ’80s, ’90s, and the initial half of the previous decade, Cadillac had found its way in a rut and at the back of the pack in terms of luxurious automotive refinement.

The brand has come a long way¬†since the days of pleather and velour upholstery, and the V-series Caddies of the modern era are not only helping Cadillac regain market share, but its reputation and rightful place on the luxury totem pole. When you have buyers cross-shopping AMG Mercs and M-series BMWs with Cadillacs, you know you’re doing something right.

¬†“It’s a sleeper; it looks subtle and the sound is incredible.” -SW

One of those buyers was¬†Sriyantha Weerasurin, or “SW” for short. Being the founder and owner of Elite Motorsports¬†in Austin, Texas, a high-end muscle, luxury and super car dealership, SW can pretty much drive whatever he wants. Being a huge car fan himself; owning everything from¬†pro-touring 2nd-gen Trans Ams, late-model Vipers, Supras and other examples of modern and vintage iron that range in power from 800-1600 hp to the tires, this daily-driven CTS-V remains his favorite.

Why? Because as SW simply puts it, “It’s a sleeper; it looks subtle and the sound is incredible.” In order to find out how a silver CTS-V can take precedence over other such remarkable high-horsespower vehicles in his collection, we’ll have to dig deeper – and so we shall.

SILVERSLEEPER-2 copy

Picking up the ‘V brand new back in November 2012 from the local Cadillac dealership, SW almost immediately went in search of more power from his daily-driven ride. After all, how can a 556 hp Caddy suffice when you’re used to something with 1600 hp, right? So he enlisted the help of 21st Century Muscle Cars¬†(21MC) for a serious boost in performance, pun intended.

GM Engineering really did an excellent job with the LSA powerplant, maybe that’s why so many car builders leave the bottom end untouched – even with increased boost pressure? Such is the case with SW’s car.

Under the hood is an LSA with a completely stock bottom end. The factory original block, crank, pistons, rings, connecting rods, bearings, et al., are all accounted for. ¬†The OEM cam has been removed, however, and a custom boost-oriented bumpstick spec’d by 21MC has went in its place. The cylinder heads were pulled, ported, polished, stuffed with¬†2.165 intake/1.59 exhaust valves with a 3-angle valve job and then reinstalled.

The OEM¬†TVS 1900 blower was removed and given a makeover; 21MC¬†ported the housing, the lid and snout, while an¬†LPE¬†LS9 solid blower isolator coupling, 8-rib belt, 21MC spacer were all added to the recipe. The stock heat exchanger was ditched in favor of a front-mount, high capacity unit with an “Ice Box” reservoir¬†upgrade. The stock boost pressure was turned up to 15.5-psi. while engine spark is provided via the stock coil packs,¬†MSD¬†wires and¬†NGK¬†plugs.

SILVERSLEEPER-10 copy

Breathing air into the 6.2L mill is a custom air box and intake tube, that feeds, cool dense oxygen into a 102mm throttle body. The air/fuel ratio is balanced out by a set of FAST 65-lb injectors and believe it or not, the stock fuel pump. Tuning is handled by John Page at 21st Century Musclecars. The spent fumes exit the engine through a pair of stainless Kooks 2-inch, long-tube headers, high-flow cats and the stock catback.

Underneath the car, the chassis/subframe have been left completely alone as well as most of the suspension itself. The only changes were made to the springs, shocks and struts, with KW Suspension coil-over components going in at all four corners, lowering the car while improving handling capabilities.SILVERSLEEPER-6 copy

Thanks to the debadged body and HRE¬†P47SC wheels measuring in at 21√ó9-inches in the front and 21√ó11-inches out back, SW’s Cadillac looks much more sinister than a standard CTS-V, aiding front end downforce along the way. Pirelli PZero rubber covers the HRE wheels and keep the power gripping the pavement, while a front splitter gives a hint of the car’s capabilities that lie within.

The interior is completely stock-appearing and quite plush as all Cadillacs are. The black leather/alacantara combination upholstery really enhances the the quality of the cabin, making occupants feel that they’re in a car that costs twice as much.

By now you’re probably wondering how much power emits from the boosted LS, and that magic number would be¬†733 horsepower 649 lb-ft. of twist to the rear HREs. That number translates to¬†10.30 at 135.7 mph in the quarter-mile – or roughly quick enough to get SW to work through the week until he straps into one of his uber-horsepower missiles.

SILVERSLEEPER-1 copy

TECH SHEET:

  • CAR:¬†2013 CTS-V
  • OWNER:¬†Sriyantha Weerasurin
  • ENGINE BLOCK:¬†Stock, LSA
  • CRANKSHAFT:¬†Stock, LSA
  • PISTONS:¬†Stock, LSA
  • CAMSHAFT:¬†21CMC; custom-grind
  • CYLINDER HEADS:¬†LSA; Stage 2 ported and polished, 2.165 intake/1.59 exhaust valves
  • COMPRESSION RATIO:¬†9.1:1
  • INDUCTION:¬†Custom 4.5-inch airbox, 102mm throttle body
  • POWER ADDER:¬†Stock TVS 1900 blower; ported, with a ported lid and snout, LPE LS9 solid blower isolator coupling, 8-rib belt, 21MC spacer
  • INTERCOOLER:¬†¬†custom; front-mount heat¬†exchanger
  • BOOST:¬†15.5-lbs.
  • IGNITION:¬†Stock coil packs, MSD plug wires
  • EXHAUST:¬†Kooks long-tube headers, high-flow catalytic converters, stock catback
  • FUEL DELIVERY:¬†FAST 85-lb. injectors, stock pump
  • OILING:¬†Stock
  • TUNING: John Page,¬†21st Century Musclecars
  • TRANSMISSION: Stock, 6L90E
  • CONVERTER: Stock
  • DRIVESHAFT:¬†Stock
  • REAREND:¬†Stock
  • SUSPENSION:¬†KW adjustable coilovers at all four corners
  • CHASSIS MODS:¬†None
  • BRAKES:¬†stock
  • WHEELS:¬†HRE P47SC 21√ó9 (front), 21√ó11 (rear)
  • TIRES:¬†Pirelli PZero 255/30/21 (front), 295/25/21 (rear)
  • HP/TQ.:¬†733/649
  • BEST 1/4-MILE ET:¬†10.30 at 135.7
  • BEST 60-FT.:¬†1.62

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