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The 2003-2005 Cadillac CTS

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The 2005 CTS builds on Cadillac's century-long tradition of technology and design innovation, and is a modern interpretation of the strikingly beautiful cars that made Cadillac famous. Built on GM's acclaimed Sigma rear-wheel-drive architecture, CTS was rigorously tested at the famed Nurburgring racetrack in Germany.

For 2005, CTS debuts a new entry-level model with a new 2.8L engine that makes 210 horsepower (156 kw) and 195 lb.-ft. of torque (265 Nm). The 2.8L V-6 VVT is a modified version of the 3.6L VVT CTS engine. Braking and suspension capabilities remain the same. The new model is intended to widen the CTS and Cadillac demographic base to include younger buyers. Production begins in October 2004. Both engines can be mated to a new six-speed manual transmission, and the 2.8L also is available with the five-speed automatic transmission.

The 2005 CTS also has a new instrument cluster, 16-inch painted wheels, 16-inch machined wheels, and three new exterior colors: Stealth Gray, Sand Storm and Moonstone.

2.8L V-6 VVT

As the second-produced variant of GM’s new global V-6 engine family, the new 2.8L V-6 VVT was designed using the latest advanced engineering tools. It is an all-aluminum 60-degree dual overhead cam, four-valve-per-cylinder design developing 210 hp (156 kw) at 6500 rpm and 195 lb.-ft. (265 Nm) of torque at 3200 rpm. Consistent with the 60 degree V-6 design, the engine employs a wide range of advanced technologies, including fully variable valve timing of the intake and exhaust valves and a dual-stage variable intake manifold to deliver outstanding flexibility, fuel economy and emissions control. The 2.8L V-6 comes mated to a new six-speed manual transmission or the Hydra-Matic 5L40-E automatic transmission.

3.6L V-6 VVT engine

The3.6L V-6 VVT debuted in the 2004 CTS, earning praise from consumers and media alike. For 2005, the 3.6L V-6 VVT comes standard with a six-speed manual transmission.

The 3.6L V-6 is an all-aluminum, 60-degree dual overhead cam, four-valves-per-cylinder design. Like the 2.8L V-6, it has fully variable valve timing and a dual-stage variable intake manifold.The 3.6L V-6 develops 255 horse power (190 kw) at 6200 rpm and 252 lb.-ft. (342 Nm) of torque at 3200 rpm.

Two transmissions

New for 2005, the CTS will be offered with an Aisin six-speed manual transmission. Eagerly anticipated by performance enthusiasts, this is the first time the 3.6L V-6 VVT will be offered with a manual transmission. The 2.8L also is available with the six-speed manual.

The six-speed transmission is fully synchronized (including reverse), with a single overdrive. This allows for lower propshaft speeds and improved NVH. The transmission is rated for 400 Nm (295 horse power) and its unique architecture is such that the gear inertias are lower, resulting in significantly lower shift efforts compared to conventional RWD manual transmissions.

The compact, state-of-the-art 5L40-E automatic transmission features a full complement of advanced electronic control capabilities. These include a shift mode button that allows the driver to select between "sport," "winter" and "economy" modes. Another electronic feature is also a first for GM: engine braking in all five gears, giving the automatic the same sporty feel as a downshifting manual.

Dramatic design

The design team gave CTS a uniquely Cadillac look. Its lean, chiseled body features sheer forms, sharp edges and crisp intersecting lines that honor Cadillac's storied past and look to the future.

Conventional Cadillac cues, including the grille and exterior lighting, have been updated for the CTS. Cadillac's traditional vertical headlamps and taillamps first appeared in 1965, and CTS refines the tradition. CTS' integrated headlamps convey the high-tech image of optical instruments and high-end camera lenses. Thin and tall, they create more space for the large, louvered grille.

The interior provides all the amenities that luxury customers have come to expect, with the emphasis on comfort and convenience. It uses warm, rich materials to contrast with the cool, computer-like, high-tech cockpit appearance, balancing the contemporary feel with touches of traditional luxury. Wooden surfaces are used sparingly on the steering wheel, shifter knob and door pulls.

New Sigma architecture

The CTS' Sigma architecture is the first usage of ultra high-strength steel at GM, and the first time the steel has been incorporated as a welded member of the structure. In the past, ultra high-strength steel was limited to applications such as bumpers, where bolts were used for attachment. Ultra high-strength steel permits the use of thinner, lighter steel, which reduces mass yet still allows proper energy absorption and reduces intrusion into the passenger compartment in an accident.

Comprehensive safety and security CTS has six air bags, including dual-stage frontal air bags for front-seat passengers. Head-curtain side air bags help protect front and outboard rear passengers. It also has Xenon high-intensity discharge (HID) halogen headlamps, StabiliTrak and OnStar, and several other safety and security features.

StabiliTrak assists the vehicle in maintaining the driver’s intended path by applying a brake force at any corner of the vehicle independent of the driver’s use of the brake pedal.

StabiliTrak uses an accelerator pedal position sensor, a brake master cylinder pressure sensor and a steering wheel angle sensor as inputs to interpret the driver’s desired path and whether to accelerate or decelerate the vehicle. StabiliTrak also uses these sensors plus a lateral accelerometer and yaw rate sensor to determine the vehicle’s actual path.

If the difference between the driver’s desired path and the vehicle’s actual path becomes great enough, StabiliTrak takes appropriate action to assist the driver with maintaining the desired path. If the vehicle begins to “snowplow,” or understeer, StabiliTrak applies the inside rear brake to help turn the vehicle. If the vehicle begins to fishtail, or oversteer, StabiliTrak applies the outside front brake to straighten the vehicle. StabiliTrak is integrated with the traction control and ABS systems.

OnStar is the leading provider of in-vehicle safety, security and information services in the United States and Canada. Using the GPS satellite network and wireless technology, OnStar features core safety services and OnStar Personal Calling that allows drivers to make and receive hands-free, voice-activated phone calls using a powerful three-watt system and external antenna for greater reception.

All 2005 Cadillac owners in the U.S. will receive 12 months of complimentary access to Cadillac VirtualAdvisor by OnStar. Cadillac Virtual Advisor service begins at activation of OnStar Personal Calling. Cadillac Virtual Advisor provides three-day weather forecasts and traffic reports within pre-selected ranges of 5, 10 or 15 miles of the vehicle’s location in most major markets. Cadillac Virtual Advisor also monitors traffic for up to three personalized routes and reports information on up to 10 selected stocks on the DJI and NASDAQ markets – all at the touch of a single button.




Body style / driveline:

entry-luxury, rear-wheel drive, 4-door sports sedan


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

EPA vehicle class:

midsize car

Manufacturing location:

LansingGrand River Assembly, Lansing, Michigan

Key competitors:

BMW 3 Series, Mercedes C-Class, Audi A4, Lexus ES 300, Lincoln LS


2.8L VVT V-6

3.6L V-6 VVT (LY7)


2.8L V-6 VVT (variable valve timing)

3.6L V-6 VVT (variable valve timing)

Displacement (cu in / cc):

170 / 2792

217 / 3564

Bore & stroke (in / mm):

89 x  3.5 / 74.8 x  2.94

3.7 x 3.37 / 94 x 85.6

Block material:

cast aluminum

cast aluminum

Cylinder head material:

cast aluminum

cast aluminum


DOHC with 4 valves per cylinder with variable valve timing (VVT)

DOHC with 4 valves per cylinder with variable valve timing (VVT)

Ignition system:

individual coil on plug, individual cylinder knock control

 individual coil on plug, individual cylinder knock control

Fuel delivery:

returnless sequential fuel injection

returnless sequential fuel injection

Compression ratio:



Horsepower (hp / kw @ rpm):

210 / 156@ 6500 rpm

255 / 190 @ 6200

Torque (lb-ft / Nm @ rpm):

195  / 265 @ 3200 rpm

252 / 342 @ 3200

Recommended fuel:

unleaded regular

unleaded regular

Maximum engine speed (rpm):

7000 auto, 7200 manual


Emissions controls:

dual close coupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers with internal exhaust gas recirculation (no EGR/AIR reqd.), evaporative emissions system

dual close-coupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers with internal exhaust gas recirculation (no EGR/AIR reqd.), evaporative emissions system

Estimated fuel economy:


MPG (city / hwy / combined)

automatic: 18 / 27 / 21
manual: 17 / 27 / 20.4

automatic: 18 / 27 / 21
manual: 17 / 27 / 20.4

MPIG (city / hwy / combined)

manual 5-speed: 22 / 35 / 26
manual 6-speed: 21 / 35 / 25

automatic: 21 / 36 / 26
manual: 20 / 35 / 25

L/100km (city / hwy / combined)

manual 5-speed: 13.1 / 8.1 / 10.8
manual 6-speed: 13.6 / 8.0 / 11.1

automatic: 13.4 / 7.9 / 10.9
manual: 14.1 / 8.1 / 11.4


Hydra-Matic 5L40-E

Aisin AY6


5-speed electronically-controlled automatic with lockup torque converter

fully synchronized 6-speed manual with single overdrive

Gear ratios (:1):






















Final drive ratio:





Standard/Luxury Package

Sport Package


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

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


independent, modified multi-link, coil springs, shock absorbers, anti-roll bar

independent, modified multi-link, coil springs, automatic load-leveling shock absorbers, anti-roll bar

Traction control system:



Steering type:

power-assisted rack and pinion

power-assisted rack and pinion, TRW Speedpro variable assist system

Steering wheel turns, lock-to-lock:



Turning circle, curb-to-curb (ft / m):

35.5 / 10.8

35.5 / 10.8



power-assist – vacuum with anti-lock control and traction control

power-assist – vacuum with antilock control, traction control, StabiliTrak stability control, with high-performance brake linings

Rotor diameter x thickness

(in / mm):

front: 11.9 x 1.3 / 303 x 32 vented disc rear: 11.7 x 1 / 298 x 26 vented disc

front: 11.9 x 1.3 / 303 x 32 vented disc rear: 11.7 x 1 / 298 x 26 vented disc


Wheel size and type:

16inch x 7-inch cast aluminum

17inch x 7.5-inch cast aluminum


Goodyear Eagle RS-A, P225/55HR16, all season

Goodyear Eagle RS-A, P225/50VR17, all season




Wheelbase (in / mm):

113.4 / 2880

Overall length (in / mm):

190.1 / 4829

Overall width (in / mm):

70.6 / 1793

Overall height (in / mm):

56.7 / 1440

Track (in / mm):

front: 60 / 1524; rear: 60 / 1524

Curb weight (lb / kg):

3.2L manual: 3568 / 1618; 3.6L automatic: 3694 / 1676

Weight distribution
(% front / rear):

53 / 47



Head room (in / mm):

front: 38.9 / 989

rear: 36.9 / 937

Leg room (in / mm):

front: 42.4 / 1077
rear: 37 / 940

Shoulder room (in / mm):

front: 56.6 / 1438

rear: 56.2 / 1427

Hip room (in / mm):

front:  53.4 / 1356

rear:  53.8 / 1366


EPA passenger volume
(cu ft / L):

98 / 2775

Cargo volume (cu ft / L):

12.8 / 362

Trailer towing maximum (lb / kg):

1000 / 454

Fuel tank (gal / L):

17.5 / 66.2

Engine oil (qt / L):

 6 / 5.7

Cooling system (qt / L):

 11.7 / 11.1

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