Technology with a Purpose – 2005 Cadillac STSSpecifications

Overview
Body style / driveline: luxury 4-door performance sedan with rear-wheel drive (V-8 and V-6) or allwheel drive (V-8 only)

Construction: unitized welded steel body with direct-mounted front cradle and rubber-isolated, multi-link independent rear suspension assembly

Manufacturing location: Lansing Grand River Assembly, Lansing, Michigan

Key competitors: BMW 5- and 7-Series, Mercedes Benz E-Class, Lexus GS/LS 430, Audi A6

Engine
3.6L V-6, Northstar 4.6L V-8

Type: 60-degree 3.6L V-6 VVT (variable valve timing) 90-degree 4.6L V-8 VVT

Displacement (cu in / cc): 217 / 3564 278 / 4565

Bore & stroke (in / mm): 3.7 x 3.37 / 94 x 85 3.66 x 3.3 / 93 x 84

Block material: cast aluminum

Cylinder head material: semi-permanent mold aluminum

Valvetrain: roller follower DOHC, 4 valves per cylinder, continuously variable inlet and exhaust cam phasing roller follower DOHC, 4 valves per cylinder, continuously variable inlet and exhaust cam phasing

Ignition system: coil-on-plug with extended-life dual platinum-tipped spark plugs coil-on-plug with extended-life dual platinum-tipped spark plugs

Fuel delivery: returnless sequential fuel injection Compression ratio: 10.2:1 10.5:1

Horsepower: 255 at 6,500 (preliminary), 320 at 6,400 (preliminary) Torque (lb.ft. at rpm): 252 at 3,200 (preliminary) 315 at 4,400 (preliminary)

Recommended fuel: 87 octane unleaded regular 91 octane unleaded premium recommended

Maximum engine speed (rpm): 6700 / 6450

Emissions controls: evaporative system, closecoupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers, electronic throttle control feedback air-fuel-ratio control evaporative system, close-coupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers, electronic throttle control feedback air-fuel-ratio control

Transmissions
Hydra-Matic 5L40-E (V-6 ) Hydra-Matic 5L50-E (V-8 )

Type: 5-speed electronically controlled automatic with lockup torque converter, Driver Shift Control, and Performance Algorithm Liftfoot 5-speed electronically controlled automatic with lockup torque converter, Driver Shift Control and Performance Algorithm Liftfoot

Final drive ratio: 3.42 RWD: 2.73, 3.23, 3.42 AWD: 3.23

Wheels/Tires
Wheel size and type: 17 x 7-inch cast aluminum 17 x 7.5/8.0-inch (split size) aluminum; or 18 x 8- inch flow formed aluminum

Tires: Michelin V-rated, 235/50R17 & 255/45R17; or Michelin ALS 235/50R17 Michelin V-rated, 235/50R17 & 255/45R17; or, Michelin W-rated, 235/50R18 & 255/45R18; or, Michelin Pilot Sport, 255/45R18

Chassis/Suspension

Standard/Luxury Package Sport Package

Front: independent, short/long arm, coil-over shock, anti-roll bar independent, short/long arm, coil-over shock, anti-roll bar

Rear: independent, modified multi-link, coil springs, automatic load leveling shock absorbers, anti-roll bar independent, modified multi-link, coil springs, magnetic ride control, pneumatic load leveling, anti-roll bar Traction control system: full-range full-range

Stabilizer bar: Front: hollow, 33-mm diameter, Rear: hollow, 17-mm diameter, RWD: hollow, 19- mm diameter, AWD: hollow, 24-mm diameter

Steering type: power-assisted rack and pinion;

Steering ratio: 18.2:1, variable ratio power-assisted rack and pinion; ZF Servotronic II variable assist system available; steering ratio: 18.2:1, variable ratio

Turning circle, curb-to-curb: V-6 w/17-inch tires 36.9, V-8 w/17-inch tires 37.7, V-8 w/18-inch tires 38.8/11.82

Brakes

Type: power-assist – vacuum with anti-lock control, traction control and StabiliTrak stability control power-assist – vacuum with anti-lock control, traction control, StabiliTrak stability control.

Optional high-performance European brake linings

Rotor diameter x thickness (in / mm):
front: 11.9 x 1.3 / 303 x 32 vented disc;
rear: 11.7 x 1.0 / 298 x 26 vented disc
front: 12.7 x 1.3 / 323 x 32 vented disc;
rear: 12.6 x 1.0 / 320 x 26 vented disc

Dimensions
Exterior Wheelbase (in / mm): 116.4 / 2956

Overall length (in / mm): 196.3 / 4986

Overall width (in / mm): 72.6 / 1844

Overall height (in / mm): 57.6 / 1463

Track (in / mm): front: 61.8 / 1569; rear: 62.3 / 1581

Curb weight (lb / kg): 3.6L automatic: 3857 / 1750;
4.6L automatic: 3921 / 1779;
4.6 automatic w/AWD: 4230 / 1919

Weight distribution (percent front / rear): V-6: 52 / 48; V-8: 54 / 46

Interior
Head room (in / mm): front: 38.7 / 983 rear: 37.9 / 962

Leg room (in / mm): front: 42.6 / 1082 rear: 38.3 / 972

Shoulder room (in / mm): front: 58.6 / 1488 rear: 57.4 / 1458

Hip room (in / mm): front: 54.6 / 1387 rear: 55.6 / 1412

Capacities
EPA total volume (cu ft): 116.7

EPA trunk volume (cu ft): 13.8

Trailer towing maximum: 1000 Fuel tank (gal.): 17.5 / 66.2

Engine oil (qt): V-6: 5 / 4.7; V-8: 10 / 9.4

Cooling system (qt): 10.9 / 10.3

Seating capacity (front/rear): 2 / 3