First boh are under the same platform (W).
The GXP is more purpose built, the SS is more of cruiser.
Yes, the The V8 does need premium gas.
The GXP has suspension setup that it tries its best to control FWD quirks from a high torque V8 from a re-tuned suspension that lowers the GXP approximately 9 mm. Bilstein gas-charged struts, higher-rate springs, and a 18.2-mm hollow rear stabilizer bar are also used. It also has upgraded brake system Oversized four-wheel vented disc brakes with Bosch four-channel ABS. The front wheels are eight inches wide, while and the rear wheels are seven inches wide. Tire sizes are P255/45R18 and P225/50R18 respectively. The tires are W speed-rated. Wider front wheels help the GXP achieve a more neutral cornering stance and optimize the inherent handling characteristics of a FWD vehicle. Magnasteer II are standard equipment too.
The Impala SS will make do with a flotier ride as it does not have the Bilsteins. It has a FE3 suspension, which includes 18-inch W-rated P235/50R18 AL3 (all-season performance) tires and five-spoke alloy wheels. A 34-mm hollow front stabilizer bar and 18-mm solid rear stabilizer bar combine to provide more roll control than the FE1 or FE2 suspensions. Also, increased stiffness helps reduce body lean and contributes to greater high-speed stability.
Lastly here you can read exactly what GM has to say about the two.
Goodluck.
2008 PONTIAC GRAND PRIX
New for 2008
GT model discontinued
Three new exterior colors: Gold Mist Metallic, Dark Mocha Metallic and Dark Slate Metallic
2008 PONTIAC GRAND PRIX EXCEEDS EXPECTATIONS IN SPORT SEDAN SEGMENT
Performance, functionality and a sporty profile converge in the 2008 Pontiac Grand Prix and Grand Prix GXP. No other sedan offers such a spacious interior, advanced safety and convenience features and nimbleness. Three new exterior colors have been added for 2008, including Gold Mist Metallic, Dark Mocha Metallic and Dark Slate Metallic.
The 2008 Grand Prix lineup features the well-equipped base model and the performance-minded Grand Prix GXP. The base Grand Prix is powered by the popular 3.8L V-6, producing 200 horsepower (149 kW). The 303-horsepower (226 kW) GXP is equipped with a 5.3L V-8. A four-wheel independent suspension with MacPherson struts forms the basis of the Grand Prix’s handling package, and provides a smooth, street-connected ride.
Inviting interior
Standard cloth seating and available leather surfaces on the 2008 Grand Prix provide the driver and passengers stylish comfort. Grand Prix interiors showcase climate control and HVAC outlets for the rear seat, two power outlets, rear reading lamps, electronic cruise control, a driver information center, remote keyless entry, power programmable door locks and ample interior storage.
The base Grand Prix comes standard with an AM/FM CD player, and the GXP model features an upgraded nine-speaker Monsoon system. Both models offer an additional range of excellent AM/FM stereos with CD/MP3 player, navigation system and six-CD changer.
The Grand Prix’s standard 60/40 split-folding rear seats, rear seat pass-through and an extra-wide trunk opening make it easy to carry large objects. Items as long as nine feet can be accommodated with the trunk closed when the available fold-flat front passenger seat is used. Ingress and egress is easy for passengers and cargo, with the rear door swinging open to a segment-leading 82 degrees.
Complete personalization
A number of packages are offered for the base 2008 Grand Prix that allow owners to personalize their ride inside and out. These packages expand the appeal of the Grand Prix by offering features customers expect on high-end performance sedans. Package options include:
Premium: dual-zone automatic air conditioning, leather-appointed front bucket seats with a passenger-side map pocket, front passenger flat-folding seatback, cargo net and heated driver and front passenger seats
Premium Light : illuminated visor vanity mirrors, front and rear reading lights and an overhead console with sunglass storage
Preferred: two-way driver lumbar control, remote vehicle start, cargo net, front passenger folding seatback, leather-wrapped steering wheel, steering-wheel mounted audio controls, leather-wrapped shift knob, driver information center and chrome interior accents (plus all the features included in the Premium Light package)
Security : head curtain side-impact air bags, four-wheel anti-lock, four-wheel disc brakes, Enhanced Traction System and powertrain modulation
Special Edition : 17-inch aluminum wheels, 17-inch touring tires, stainless-steel dual exhaust with dual outlets, body-color grille, front and rear fascia extensions and side rocker panels
Sun and Sound: power sunroof, Monsoon premium nine-speaker system and AM/FM stereo with six-disc in-dash CD changer
Safety and convenience
Grand Prix’s convenience and safety features are perfect for drivers who enjoy the precise handling characteristics of a sporty, family-friendly package. The 2008 Grand Prix remains a driver’s car inside and out. The active and passive safety features on the Grand Prix include standard four-wheel disc brakes, traction control and daytime running lamps.
The Grand Prix GXP takes convenience to another level with a standard head-up display (HUD), which helps the driver focus on the road by displaying dashboard information in the windshield. HUD also allows the driver to pilot with the instrument lights off for better night vision.
Dual-stage frontal air bags provide supplemental security for front-seat passengers. The Grand Prix’s air bag system’s control unit determines whether the severity of a crash warrants air bag deployment and if just the primary stage or the primary and secondary stages are necessary. This smart system helps reduce the risk of air bag-induced injuries. Head curtain air bags are also available for additional protection. They unfold from the roof rail between the A-pillar and side window header. The side air bags deploy in an angle toward the window to help provide protection for front and rear outboard passengers.
Grand Prix is equipped with child security locks and LATCH (Lower Anchors and Tethers for CHildren) system anchors for child safety seats. Two lower anchors and a top tether anchor secure the child seat to the vehicle seat structure for proper installation of compatible child safety seats.
OnStar is standard on Grand Prix, and includes enhanced digital hands-free voice recognition capabilities including more intuitive continuous digit dialing and improved voice recognition accuracy. Using the GPS satellite network and wireless technology, OnStar features core safety and security services and OnStar Hands-Free Calling, which allows drivers to make and receive voice-activated phone calls.
The OnStar service standard on the Grand Prix includes the General Motors Advanced Automatic Crash Notification (AACN) system, making crash data available to participating 911 centers to help them dispatch the appropriate life-saving personnel and equipment to crash scenes faster.
GM’s tire pressure monitoring system is standard on all Grand Prix models. The system uses sensors to track tire pressure, helping drivers avoid premature tire failure and potentially dangerous, costly breakdowns.
Performance engines
Achieving 0-to-60 mph times in 5.6 seconds is no easy accomplishment, but the Grand Prix GXP’s engine, which kicks out 303 horsepower (226 kW) and 323 lb.-ft. of torque (438 Nm), does it without breaking a sweat. The 5.3L V-8 uses GM’s Active Fuel Management (AFM) technology developed exclusively for front-drive applications and helps reduce fuel consumption by up to 12 percent in certain light-load driving conditions.
AFM technology enables fuel economy gains by reducing the number of cylinders engaged in the combustion process. A sophisticated engine controller determines when to deactivate cylinders, allowing the engine to maintain vehicle speed in lighter-load conditions such as highway cruising.
Key features of the 5.3L V-8 include an aluminum engine block with cross-bolted main bearing caps, lightweight composite intake manifold, electronic throttle control and GM’s Oil Life System to minimize required oil changes. GM’s Oil Life System informs the driver when an oil change is required based on driving conditions, not on a predetermined time or mileage basis. GM’s Oil Life System monitors engine speed and temperature, and the computer continuously examines engine conditions to determine when it's time to change the motor oil.
A high-performance Hydra-Matic 4T65 electronically controlled four-speed automatic transmission was strengthened to handle the prodigious torque of the 5.3L V-8. TAPshift (Touch Activated Power) is standard with the GXP and combines the fun and control of a manual transmission with the convenience of an automatic transmission.
GXP details
A Grand Prix on the automotive equivalent of steroids, the GXP model has a unique suspension and a more aggressive look resulting from a re-tuned suspension that lowers the GXP approximately 9 mm. GXP-specific body enhancements complement the car’s forceful stance, with front and rear fascias along with rocker extensions accentuating the low profile. Bilstein gas-charged struts, higher-rate springs and a larger hollow rear stabilizer bar for reduced body roll are also used.
The Grand Prix GXP has an upgraded brake system designed to match the car’s awesome performance. Oversized four-wheel vented disc brakes with Bosch four-channel ABS provide superior stopping power.
Polished, forged aluminum 18-inch wheels (P255/45R18 in front and P225/50R18 in reaer) offer a unique feature for the 2008 Grand Prix GXP. The front wheels are eight inches wide, while the rear wheels are seven inches wide. The tires are W speed-rated. Wider front wheels help the GXP achieve a more neutral cornering stance and optimize the inherent handling characteristics of a front-wheel drive-vehicle.
StabiliTrak, GM’s electronic stability control system, and Magnasteer II are standard. StabiliTrak greatly improves vehicle control with a series of sophisticated sensors that maintain vehicle direction by independently applying brake force at the appropriate corners of the car. StabiliTrak monitors differences between the driver’s desired path and the vehicle’s actual path and then takes preventive measures to maintain the desired path. StabiliTrak greatly reduces the possibility of oversteer or understeer. StabiliTrak is integrated with the vehicle’s ABS and traction control systems.
SPECIFICATIONS
Overview
Models:
Pontiac Grand Prix and GXP
Body style / driveline:
5-passenger, front-engine, front-drive sedan
Construction:
unitized body frame, 1- and 2-sided galvanized steel
EPA vehicle class:
midsize sedan
Manufacturing location:
Oshawa, Ontario, Canada
Key competitors:
Nissan Maxima, Nissan Altima, Honda Accord, Dodge Charger
Engines
3.8L V-6 (L26)
5300 5.3L V-8 (LS4)
Application:
std on Grand Prix
std on GXP
Type:
3.8L V-6
5.3L V-8
Displacement (cu in / cc):
231 / 3791
325 / 5328
Bore & stroke (in / mm):
3.8 x 3.4 / 96.52 x 86.36
3.78 x 3.62 / 96 x 92
Block material:
cast iron
cast aluminum
Cylinder head material:
cast iron
cast aluminum
Valvetrain:
overhead valve, 2 valves per cylinder
OHV, 2 valves per cylinder
Ignition system:
electronic, direct ignition system (DIS) and electronic spark control (ESC) and extended-life platinum-tipped spark plugs
coil-near-plug, iridium electrode tip / iridium core spark plugs, low-resistance spark plug wires
Fuel delivery:
sequential-port fuel injection
Active Fuel Management, sequential-port fuel injection
Compression ratio:
9.4:1
10:1
Horsepower (hp / kW @ rpm):
200 / 149 @ 5200
303 / 226 @ 5600
Torque (lb-ft / Nm @ rpm):
230 / 311 @ 4000
323 / 438 @ 44 00
Recommended fuel:
regular unleaded (Grand Prix)
premium recommended (GXP)
Maximum engine speed (rpm):
6000
6100
Emissions controls:
evaporative emissions system, single close-coupled catalytic converter, positive crankcase ventilation, electronic throttle control, exhaust gas recirculation, SAI-supplemental air injection-SULEV, fast response oxygen sensor-SUVLEV
underfloor catalytic converter, Quick Sync 24X ignition, returnless fuel rail, fast-response O² sensor
EPA Estimated fuel economy (city/hwy)
18/28
16/25
Transmission
Type:
Hydra-Matic 4T65 4-spd electronic automatic FWD transverse (heavy-duty version with 5.3L)
Gear ratios (:1):
First:
2.92
Second:
1.56
Third:
1.00
Fourth:
0.70
Reverse:
2.38
Final drive ratio:
3.8L: 3.05:1
5.3L: 2.93:1
Chassis/Suspension
Front:
MacPherson struts with coil springs, lower A-arm, 20-mm solid anti-roll bar
Rear:
independent, tri-link coil over strut, 17.2-mm anti-roll bar on Grand Prix/GXP
Steering type:
low-friction rack and pinion, power-assisted on Grand Prix and Magnasteer II on GXP
Steering ratio:
13.2:1
Steering wheel turns, lock-to-lock:
2.4
Turning circle, curb-to-curb (ft / m):
37.4 / 11.3 Grand Prix, 38.0 / 11.6 GXP
Brakes
Type:
4-wheel disc, ABS std on GXP, opt on Grand Prix;
front: vented discs, power assisted
rear: solid discs, power assisted on base
front and rear vented discs w/cross-drilled rotors on GXP
Rotor diameter (in / mm):
front: 11.7 / 297; rear: 10.5 / 270 on base
front: 12.7 / 323; rear: 12 / 305 on GXP
Wheels/Tires
Grand Prix
Available on Grand Prix
GXP
Wheel size and type:
16-inch aluminum (QD1), std tire pressure monitoring system
16-inch 5-spoke aluminum (QP1), 16-inch black-painted steel (QB5), 17-inch aluminum (P04), std with B2E Special Edition Package
18 x 8-inch front (QR1), 18 x 7-inch rear forged aluminum, std tire pressure monitoring system
Tires:
Goodyear Eagle P225/60R16
Michelin Energy P225/55HR17
Bridgestone Potenza
P255/45R18 front P225/50R18 rear
Dimensions
Exterior
Grand Prix
GXP
Wheelbase (in / mm):
110.5 / 2807
110.5 / 2807
Overall length (in / mm):
198.3 / 5038
198.3 / 5038
Overall width (in / mm):
71.6 / 1819
71.6 / 1819
Overall height (in / mm):
55.9 / 1420
55.9 / 1420
Track (in / mm):
front: 61.6 / 1565
front: 61.6 / 1565
rear: 61.3 / 1577
rear: 61.7 / 1557
Curb weight (lb / kg):
3477 / 1577
3600 / 1633
Weight distribution (% front / rear):
62 / 38
62 / 38
Interior
Seating capacity (front / rear):
2 / 3
Headroom (in / mm):
front: 38.8 / 986; rear: 36.2 / 919
Legroom (in / mm):
front: 42.2 / 1072; rear: 36.2 / 1072
Shoulder room (in / mm):
front: 58 / 1473; rear: 54.8 / 1392
Hip room (in / mm):
front: 54.5 / 1384; rear: 54.3 / 1379
Capacities
EPA interior volume (cu ft / L):
114 / 3228
Cargo volume (cu ft / L):
16 / 453; 57 / 1614 with all seats folded down
Trailer towing maximum (lb / kg):
1000 / 454
Fuel tank (gal / L):
17 / 64.3
Engine oil (qt / L):
3.8L: 4.3 / 4.1 ; 5.3L: 6.0/5.7
Cooling system (qt / L):
3.8L: 11.2 / 10.6; 5.3L: 13.0 / 12.3
Note: Information shown is current at time of publication.
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{b]2008 CHEVROLET IMPALA & IMPALA SS
New for 2008
StabiliTrak electronic stability control system standard on 2LT, LTZ and SS
E85 FlexFuel capability on the 3.9L V-6 engine
XM Satellite Radio standard on all models
18-inch chrome aluminum wheels on SS
18-inch machined aluminum flangeless wheels on LTZ
17-inch alloy wheels 2LT
Performance suspension standard on LTZ
1LT Luxury Edition includes leather trim, OnStar Turn-By-Turn Navigation, steering wheel radio controls, flip-and-fold rear seat, ABS with traction control and rear spoiler
Three exterior colors: Gold Mist Metallic, Mocha Bronze Metallic and Slate Metallic
2008 CHEVROLET IMPALA: STABILITRAK STABILITY CONTROL AND ADDITIONAL E85 FLEXFUEL POWERTRAIN HIGHLIGHT'08 MODEL YEAR
Chevy’s popular Impala was one of America's top 10 vehicles in sales during the 2006 model year and continued to attract more customers through'07 – including a nearly 44-percent jump in February'07 alone. Indeed, the Impala’s combination of chiseled style, generous room, sporty driving characteristics and value answers the needs of a broad range of drivers.
The 2008 Impala reinforces the brand’s value story with new features and revisions that add to its safety and efficiency, including the addition of standard StabiliTrak electronic stability control on 2LT, LTZ and SS models; and the addition of E85 FlexFuel capability to the 3.9L V-6 engine – an engine that also is equipped with the fuel-saving Active Fuel Management feature.
This marks the second engine in the Impala lineup to offer E85 capability; the 3.5L V-6 also is offered in a FlexFuel configuration. In fact, fuel-saving and FlexFuel powertrains are found in all Impala models:
The 3.5L V-6 of LS and LT models comes standard with E85 FlexFuel capability in some markets and is available with it in some others
The 3.9L V-6 that is standard on LTZ (and available on LT) is equipped with standard E85 FlexFuel capability and Active Fuel Management
The 5.3L V-8 of the Impala SS comes with standard Active Fuel Management.
Active Fuel Management is a fuel-saving technology that shuts off half the engine’s cylinders when full power is not needed. It can improve fuel economy by up to 12 percent in certain driving situations.
“Alternative fuels and fuel economy are important considerations for many customers,” said Ed Peper, Chevrolet general manager. “The Impala lineup offers a great range of models that answer the needs of those who are looking for efficient, flexible engines – and with the 3.9L engine, they can now choose a FlexFuel vehicle that also provides the gas-saving benefits of Active Fuel Management.”
New and revised features for'08
Impala’s standard and available safety features include ABS, traction control and side-curtain roof rail air bags. StabiliTrak electronic stability control is new for'08 and is standard on 2LT, LTZ and SS models.
Additional new features and revisions for'08 Impala include:
XM Satellite Radio is standard on all models
18-inch chrome aluminum wheels on Impala SS
18-inch machined aluminum flangeless wheels on LTZ
17-inch alloy wheels on 2LT models
Performance-oriented FE3 suspension is standard on LTZ
Three exterior colors: Gold Mist Metallic, Mocha Bronze Metallic and Slate Metallic
There is also a new 1LT Luxury Edition package, which features a leather-trimmed interior – including a leather-wrapped steering wheel with radio controls – flip-and-fold rear seat, four-wheel ABS with electronic traction control, rear spoiler, OnStar with Turn-By-Turn Navigation and one-year Directions & Connections service. This package offers popular features and the industry’s easiest-to-use navigation system at a discounted price.
Impala design
Chevy Impala conveys sophistication and exudes big-car roominess. On the exterior, large headlamps have a premium, jeweled appearance with three independent lighting units. These details complement other high-quality attributes, such as tight tolerances of 3.5 mm or less between body components and substantial “grab”-style door handles, to provide an overall feeling of solidity. Also, new, flat-blade windshield wipers are used to provide consistent pressure on the glass, which helps eliminate streaking and wind noise.
The Impala LS, LT and LTZ models have varied exterior trim cues that identify each model, while the Impala SS receives a distinct front-end appearance. It includes a dual-split grille with a SS-signature black-diamond crosshatch pattern. At the rear, a spoiler is standard on LTZ and SS models and is available on LT. The Impala SS also receives Corvette-inspired bright exhaust tips.
Inside, Impala is packed with thoughtful features, including clever flip-and-fold rear seats (standard on LTZ and SS, available on LT). The forward-flip rear seat cushions reveal a storage tub under the seat that can contain spillage while transporting a variety of items. The tub also serves as a covered storage area beneath the seat with cushions down and offer convenient grocery bag hooks when the cushions are flipped forward. A generous pass-through from the trunk can be created by flipping the seat bottoms forward and the seat backs flat – an exclusive feature in the midsize segment.
All of Impala’s available seating features cleaner, simpler and more tailored appearances. Uplevel Nuance leather- appointed seating features premium deck seams around their perimeter and French seams on the center cushions. The seats also have firmer cushions and increased lumbar support that provide more comfort, especially during long drives. The driver’s seat also includes adjustable lumbar.
The Impala’s instrument panel wraps around into the door panels and has a double-hump design that is reminiscent of early Corvettes. Impala LS, LT and LTZ models have a wood-trimmed appearance, while a sportier, brushed sterling-appearance trim is available. The Impala SS comes standard with a “technical”-pattern trim panel, with the wood-trimmed appearance as an option.
Completing the Impala’s comprehensive interior is a host of useful comfort and convenience features, including:
Available dual-zone climate control system with up to 12 degrees F temperature setting difference between the two front zones
Available factory-installed remote vehicle start system with a 200-foot (61-meter) range and automatic climate pre-conditioning to warm or cool the vehicle prior to entry (Impala LS features available dealer-installed remote start)
Informative gauge clusters and an expanded driver information center – with more than 50 alerts, depending on the vehicle’s equipment
Standard easy-access, steering wheel-mounted cruise control buttons
Steering wheel radio controls on uplevel models
Eight-way, heated power driver seat standard on LTZ and SS leather-appointed seats; six-way power driver seat standard on LS, LT with cloth seats
New 7.0 Generation OnStar system offers Turn-by-Turn navigation.
Three audio systems feature simple-to-operate radios that include standard XM Satellite Radio and are compatible with the enhanced OnStar system. The base MP3/CD radio includes a six-speaker system, a two-line, 32-character reconfigurable display and the capability to select between AM, FM and XM stations without having to reset the frequency. An uplevel ICDX radio adds an in-dash six-CD changer. Impala also offers a premium Bose audio system. All radios include a standard auxiliary input jack for external devices such as an iPod or remote cassette player. Located in the lower right-hand corner of each radio, the input allows for plug-and-play through Impala’s sound system.
Chassis and suspension
Quiet, smoothness and refinement are the ride and handling traits conveyed through the Impala’s chassis and suspension systems. A robust front-end structure provides a firmer foundation to help reduce noise, vibration and harshness (NVH), while also enhancing steering and handling performance.
Impala’s fully boxed upper frame rail assemblies have a wider, deeper and structurally stronger upper front tie bar. Stronger ties between the upper and lower rails stiffen the front structure for improved ride and handling and a large, lower front-of-dash panel has been strengthened. It is constructed of Quiet Steel laminated steel, which consists of sound deadening material bonded between sheets of steel and reduces resonant sound.
An extruded aluminum engine cradle is used on both vehicles, too, and contributes to a smoother, vibration-free ride. The cradle’s lateral stiffness (at the steering joint) is increased with a new, one-piece machined rear cross member and new aluminum rear body mounts to help improve handling control. Models equipped with a V-6 engine have a two-point engine-mounting system, while V-8 models have a three-point mounting system.
A power rack-and-pinion steering system is standard on all models, with a responsive 13.3:1 steering ratio on LT, LTZ and SS models. All models feature a quiet, efficient power steering system that optimizes internal flow of the hydraulic steering fluid within the pump and reservoirs.
The front suspension features a MacPherson strut coil-over-spring independent setup with gas-charged struts and a stabilizer bar. Tall jounce bumpers in the front suspension help enhance stability and control. The rear suspension uses a trailing arm, tri-link setup with gas-charged struts and coil springs. A rear stabilizer bar is standard on all models. Based on the basic front and rear suspension designs, the Impala offers two levels of suspension tuning – FE1 and FE3 – each matched to the power and expected performance level of its respective model
FE1 (LS and LT): The FE1 suspension provides great control without compromising ride quality. It uses stiff, constant-rate front springs and variable-rate rear springs to provide higher roll rates and, at the front, a stiffer torque strut design reduces NVH and helps provide a smoother, quieter ride. The packages include 16-inch wheels and P225/60R16 ALS (all-season) Goodyear Integrity radials; on LT models equipped with the 3.9L V-6, it includes 17-inch wheels and P225/55R17 AL2 (touring) Goodyear Eagle LS2 radials.
FE3 ( LTZ and SS): Impala LTZ and SS models receive a FE3 suspension, which includes 18-inch W-rated P235/50R18 AL3 (performance) tires and five-spoke alloy wheels, to provide a sporty ride that complements the 5.3L small-block V-8’s performance. A 34-mm hollow front stabilizer bar and 18-mm solid rear stabilizer bar combine to provide more roll control than the FE1 or FE2 suspensions. Also, increased stiffness helps reduce body lean and contributes to greater high-speed stability.
Powertrain details
Impala’s V-6 engines are as fuel-efficient as they are sophisticated. A 3.5L V-6 is standard in the Impala LS and LT, delivering 211 horsepower (157 kW)* and 214 lb.-ft. (290 Nm)* of torque – more standard power as a base engine than some key competitors’ top (or only) offering.
Vehicles with federal emissions systems in the United States are equipped with the 3.5L engine, which is compatible with E85 ethanol fuel, allowing the vehicle to run on any combination of gasoline and/or E85. Vehicles sold in YF5 ( California ) or NE1 (Northeast) emissions are equipped with PZEV versions of the 3.5L engine. This engine is not E85-compatible. Customers in these areas have the option of ordering E85-compatible engines .
Standard in LTZ and available in LT models is the 3.9L V-6 that features E85 FlexFuel capability and Active Fuel Management. The 3.9L uses variable valve timing and a variable-length intake manifold to help produce 233 horsepower (174 kW)* and 240 lb.-ft. (325 Nm) of torque.* This engine offers more power and usable torque within its operating range, with 90 percent of peak torque available from 1800 to 5800 rpm.
The 5.3L all-aluminum small-block V-8 powers the performance-oriented Impala SS. It features Active Fuel Management, which can provide up to 8 percent better fuel economy. Developed exclusively for front-drive applications, the SS’s 5.3L engine produces 303 horsepower (226 kW)* and 323 lb.-ft. (438 Nm)* of torque.
All of Impala’s engines are matched with the Hydra-Matic 4T65 electronically controlled four-speed automatic transmission, which is renowned for its smoothness and durability. A strengthened version is equipped with the 5.3L engine to handle the V-8’s torque.
Safety and crash avoidance
Impala offers standard side-curtain air bags, which provide optimum head protection for outboard passengers. The side curtain air bags are mounted in the side roof rails and deploy down to the lower edge of the windows from the A-pillar to the C-pillar. Impala’s other safety features include:
StabiliTrak electronic stability control system is new for 2008; it is standard on 2LT, LTZ and SS models
Four-wheel-disc brake system featuring smooth, quiet operation, longer pad life, and more resistance to brake pulsation
ABS system is standard on LTZ and SS, and available on LS and LT, and helps provide improved steering control while braking. It also includes Electronic Brake Force Distribution, which helps provide optimum braking regardless of load, traction or braking speed
Available engine- and brake-managed full-function traction control system works with the ABS system to help ensure stable acceleration on a variety of road conditions
Pretensioners are standard on the front safety belts, helping to minimize forward movement during a frontal collision and new, more effective load-limiting retractors. The retractors have more “take-up” force, cinching the belt more tightly. Three-point safety belts are equipped in all standard seating positions
LATCH (Lower Anchors and Tethers for CHildren) child seat attachment system is included in all second-row seating positions
Tire pressure monitoring system is standard on all models
Standard remote keyless entry (RKE) system provides a second function for the red panic button. Drivers can use the button to locate their cars, without sounding the panic alarm.
The Impala includes features designed to enhance the vehicle structure, including lighter, more rigid front and rear bumper systems. Also, the Impala features a strengthened “safety cage” passenger compartment with the front and rear doors designed for improved energy dissipation in the event of a crash.
The OnStar system is standard on Impala. Its digital hardware includes upgraded hands-free voice recognition capabilities, including more intuitive continuous digit dialing and improved voice recognition accuracy. 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 3-watt digital/analog system and external antenna for greater reception.
The OnStar service available on the 2008 Impala includes the General Motors Advanced Automatic Crash Notification (AACN) system, making crash data available to 911 centers to potentially dispatch the appropriate life-saving personnel and equipment to crash scenes faster.
The 7.0 Generation OnStar system offers Turn-by-Turn navigation with the optional Directions and Connections service. Turn-by-Turn navigation directs the driver through the route by using the digital readout lines in the radio head. Directions are downloaded by the OnStar advisor to the vehicle and can be played back or paused through the drive up to the destination. Besides being an easy to use system (all directions are downloaded to the car by an advisor) Turn-by-Turn offers an affordable system that is always up to date (no need to purchase map updates).
SPECIFICATIONS
Models:
Chevrolet Impala LS, LT, LTZ and SS
Body style / driveline:
front-engine, front-drive, 5- / 6-passenger sedan
Construction:
2-sided galvanized steel (except roof); Quiet Steel (F.O.D.)
EPA vehicle class:
large car
Manufacturing location:
Oshawa, Ontario, Canada
Key competitors:
Ford Taurus, Honda Accord, Toyota Camry, Nissan Altima, Chrysler 300C
Engines
3500 3.5L V-6 w/VVT (LZE, LZ4)
3.9L V-6 (LZG)
5.3L V-8 (LS4)
LZE (E85): std. in FE9 states; optional in YF5 and NE1 States
LZ4:std. in Canada and NE1 and YF5 states
Application:
LS, LT
LT, LTZ
SS
Type:
3.5L V-6
3.9L V-6
5.3L V-8
Displacement (cu in / cc):
214 / 3510
237 / 3880
325 / 5327
Bore & stroke (in / mm):
3.90 x 2.99 / 99 x 76
3.90 x 3.31 / 99 x 84
3.78 x 3.62 / 96 x 92
Block material:
cast iron
cast iron
cast aluminum
Cylinder head material:
cast aluminum
cast aluminum
cast aluminum
Valvetrain:
overhead valve, 2 valves per cylinder, continuously variable valve timing
overhead valve, 2 valves per cylinder, continuously variable valve timing
overhead valve, 2 valves per cylinder
Ignition system:
Quick Sync 58X; direct
iridium electrode tip / iridium core spark plugs, low resistance spark plug wires
Quick Sync 58X; direct
iridium electrode tip / iridium core spark plugs, low resistance spark plug wires
coil-near-plug, iridium electrode tip / iridium core spark plugs, low resistance spark plug wires
Fuel:
sequential fuel injection
Active Fuel Management; sequential fuel injection
Active Fuel Management; sequential fuel injection
Compression ratio:
9.8:1
9.8:1
10:1
Horsepower (hp/ kW @ rpm):
211 / 157 @ 5800*
233 / 174 @ 5600
303 / 226 @ 5600
Torque (lb-ft / Nm @ rpm):
214 / 290 @ 4000*
240 / 325 @ 4000
323 / 438 @ 40 00
Fuel:
(LZ4) regular unleaded;
(LZE) regular unleaded, E85-capable
regular unleaded; E85 capable
premium recommended but not required
Maximum engine speed (rpm):
6400
6400
6100
Emissions controls:
close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor
close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor
underfloor catalytic converter, Quick Sync 24X ignition, returnless fuel rail, fast-response O² sensor
Estimated fuel economy:
TBD
TBD
TBD
Transmission
Type:
Hydra- Ma tic 4T65, 4-speed automatic, front-wheel drive
Gear ratios (:1):
First:
2.92
Second:
1.56
Third:
1.00
Fourth:
0.70
Reverse:
2.38
Final drive ratio:
3.5L – 2.86:1; 3.9L – 3.29:1; 5.3L – 3.29:1
Overall drive ratio:
3.5L – 2.86:1; 3.9L – 3.29:1; 5.3L – 2.93:1
Chassis/Suspension
Suspension type:
std. with LS, LT: FE1; std with LTZ, SS: FE3
Front:
independent MacPherson strut coil-over-spring, twin-tube dampers with gas-charged valving; coil springs; hollow 30-mm stabilizer bar; FE3 has hollow 34-mm stabilizer bar
Rear:
independent tri-link coil over strut, twin-tube dampers, variable-rate coil springs, 16-mm solid stabilizer bar (FE1); LTZ/SS FE3 has dual rate coil springs, hollow 19.4-mm stabilizer bar
Steering type:
power rack-and-pinion (all models)
Steering ratio:
13.3:1 (all models)
Steering wheel turns, lock-to-lock:
3.5L and 3.9L: 2.4; 5.3L: 2.3
Turning circle, curb-to-curb (ft / m):
38 / 11.6: models with 16-inch or 17-inch wheels
40 / 12.2: models with 18-inch wheels
Brakes
Type:
4-wheel disc with power assist, vented front, solid rear
Rotor diameter x thickness (mm):
front: 303 x 30;
rear: 278 x 11
ABS
opt. LS, std: LT, LTZ, SS
Wheels/Tires
w/ 3.5L engine
w/ 3.9L engine
w/ 5.3L engine
Wheel size and type:
std: 16 x 6.5- inch, steel wheels, available cast aluminum w/ five-spoke composite wheel cover; opt: same size painted aluminum wheels
2LT:17 x 6.5-inch high-vent steel w/ chromed wheel covers
LTZ: five-spoke 18x 7-inch machined aluminum wheel
std: 18 x 7-inch chrome aluminum
Tires:
P225/60R16
P225/50R17 (2LT)
P235/55R18 (LTZ)
P235/50R18
Dimensions
Exterior
Wheelbase (in / mm):
110.5 / 2807
Overall length (in / mm):
200.4 / 5091
Overall width (in / mm):
72.9 / 1851
Overall height (in / mm):
58.7 / 1487
Track (in / mm):
(all) front: 62.4 / 1585.5; rear : 61.5 / 1562
Curb weight (lb / kg):
LS: 3555/ 1613
LT w/3.5L: 3555/ 1613
LT w/3.9L: 3649 / 1655
LTZ: 3649 / 1655
SS: 3711 / 1683
Weight distribution (% front / rear):
LS: 62 / 38
LT: 61 / 39
LTZ: 61 / 39
SS: 62 / 38
Drag coefficient:
0.33
Interior
front
rear
Seating capacity:
LS, LT, LTZ: 2/3; SS: 2
All models: 3
Headroom (in / mm):
39.4 / 1001
37.8 / 961
Legroom (in / mm):
42.3 / 1076
37.6 / 954
Shoulder room (in / mm):
58.7 / 1490
58.6 / 1488
Hip room (in / mm):
56.4 / 1432
57.2 / 1452
Rear pass-through (in / mm):
15.4 / 390 x 37.1 / 943
Capacities
EPA passenger volume (cu ft / L):
104.5 / 2959
EPA interior volume (cu ft / L):
123.1 / 3486
Cargo volume (cu ft / L):
18.6 / 526.7
Trailer towing maximum (lb / kg):
1000 / 454
Fuel tank (gal / L):
17.5 / 66.2
Engine oil (qt / L):
3.5L: 4.5 / 4.3; 3.9L: 4.5 / 4.3; 5.3L: 6.0/ 5.7
Cooling system (qt / L):
3.5L: 11.7 / 11.1; 3.9L: 12.2 / 11.5; 5.3L: TBD
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-----The orginal Mr.Goodwrench on the JBO since 11/99-----
