Q45 (1st Gen): Technical Data / Specifications / Capacities

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Facts

Built in Japan.Produced 1989-1996.

Year-to-Year Changes (Src: Consumer Guide, some changes made)

1990 Infiniti Q45: The 1990 Q45 is the most sought after by performance enthusiasts for having the tightest and most responsive steering, quickest shifting, and an actual power rating of 300-305hp. Because of a "gentleman's agreement" among Japanese manufacturers, vehicles above a certain horsepower rating were not exported. Infiniti advertised 278hp, lower than actual output. Dealers offered BBS wheels, wood trim, and window tint as an option for customers. These options were not provided by Nissan.

1991 Infiniti Q45: Two new options joined for 1991: a traction-control system, and the world's first production "Full-Active Suspension (FAS)" In that latter setup, computer-controlled hydraulic actuators at each wheel generate forces in response to signals from 10 sensors to counteract body lean, nose lift and nose dive, and fore/aft pitch on wavy surfaces.

1992 Infiniti Q45: Cars with the Full-Active Suspension were now named "Q45A." In response to customer complaints, steering became lighter and shifts became smoother.

1993 Infiniti Q45: Monotone interiors replaced the former 2 tones, and steering wheels and other items adopted color-keying. All Q45s from here onward start off the line in first gear. Formerly, they started in second for smoother takeoffs.

1994 Infiniti Q45: The '94 Q45 arrived in spring 1993, adding a passenger-side airbag. The restyled front end featured a chrome grille and fog lamps. All Q45s now had front seatbelt pretensioners, softer leather seats, and wood inlays. Interiors adopted a friendlier layout with natural earth tones and factory wood trim around the shifter console. Side bolstering was reduced for comfort, and the seat bottoms widened to better accommodate larger drivers. Suspension bushings were softened for an easier and smoother ride. This is the last year for optional HICAS four-wheel steering, used to improve handling at highway speeds. Transmission cooling was significantly improved in response to to early failures in previous models. Thicker windows reduced road noise, making the 1994-1996 Q45 one of the quietest luxury cars sold in the United States. Air conditioning in 1994 began using the environmentally friendly R134a refrigerant, with additional condenser fans to make up for 134's reduced effectiveness. The piepan-style wheels in 1994 were replaced with turbine-style wheels with long spokes.

1995 Infiniti Q45: New alloy wheels. In late 1994, the one-touch sunroof open feature apparently disappeared. This is the last year for the Q45a with fully active height-adjustable suspension.

1996 Infiniti Q45: V8 engines deleted variable valve timing to meet new US emissions standards. Power was still advertised as 278hp, but now reflected actual output. ODB II was introduced, making diagnostics a bit easier. This year some leather interior pieces were replaced with vinyl. Metal handles were replaced with plastic. The headliner material also changed, possibly in late 1995. Due to financial difficulties, Nissan was forced to take these measures on the interior, but the 96 Q45 is among the most reliable and easiest to diagnose of the G50 series, as well as the most environmentally friendly on emissions.

1997 Infiniti Q45: The second-generaion Q45, originally based on the JDM short-wheelbase Nissan President, was replaced by the less powerful but lighter Nissan Cima, using a 4.1L 266hp V8 (VH41DE). Performance was much improved over the heavy 1996 model, the interior had more room, the ride was more compliant, but handling suffered. The analog clock disappeared but returned in later years. The original Nissan President was sold in Japan from 1990-2002.

Dimensions (Src: NICO)

Infiniti Q45 4-door sedanWheelbase, in. 113.4Overall Length, in. 199.8Overall Width, in. 71.9Overall Height, in. 56.3Curb Weight, lbs. 4039Cargo Volume, cu. ft. 14.8Standard Payload, lbs. --Fuel Capacity, gals. 22.5Seating Capacity 5Front Head Room, in. 38.2Max. Front Leg Room, in. 43.9Rear Head Room, in. 36.3Min. Rear Leg Room, in. 32.0

Powertrain

Engine:90-96 4.5L DOHC 32v V8 (VH45DE)4494 cc274 ci93x82.7 mm10.2:1 compressionHP: 278 at 6000 rpm*Torque: 292 lb-ft at 4000 rpm

Transmissions:90-93RE4R03A 51x65 transmission4 speed autoGear Ratio1st 2.784:12nd 1.544:13rd 1.000:14th 0.694:1R200V viscous limited slip differentialFinal Drive Ratio: 3.538:1

94-96RE4R03A 51x79 transmission4 speed autoGear Ratio1st 2.569:12nd 1.479:13rd 1.000:14th 0.694:1R200V viscous limited slip differentialFinal Drive Ratio: 3.538:1*Due to a limitation set by a Japanese manufacturer's agreement, the power and torque are greater than advertised, estimated at 300-305hp.

Fuel Consumption

EPA MPG City: 17EPA MPG Highway: 22

Technical Reference Specifications (Src: "vududoc" on NICO)

1990-1996 Q45

EngineOil SAE 10W-30 (API SG, SH & Energy Conserving II) With Oil Filter 6 3/8 qt Without Oil Filter 5 7/8 qtPlease see the engine oil guide for other reccommendations.

Tune upSpark Plugs (Platinum)Standard Type PFR5G-11Cold Type PFR6G-11 PFR7G-11Ignition Timing 15° ± 2° BTDCBase Idle speed 600 ± 25 rpmCurb Idle (target) 650 ± 50 rpmIdle Mixture Ratio Less than 8 % CO

Throttle Position SensorT/P Closed Approx. 0.6 kÙT/P Open Approx. 5 kÙIdle position voltage 0.35 - 0.65VClosed T/P Sw On rpm 810 ± 150 rpm

Radiator FillCoolant Type Ethylene GlycolCoolant Capacity 10 7/8 qtReservoir Tank 3/4 qt

Compression TestStandard 185 psiMinimum 142 psiDiff Between Cyl. 14 psi

Fuel SystemFuel Pump Pressure @ IdleVacuum applied at fuel pressure regulator 34 psiVacuum released at fuel pressure regulator 43 psiRecommended Fuel 91 OctaneFuel Pump Ù 0.2 - 5 ÙFuel Injector Ù 10 - 14 Ù

SensorsFt/Rr O2 Sen Heaters2.3 - 4.3 ÙCrank Position Sensor68 °F (20°C) 470 - 570 ÙMass Air Flow SensorSupply Volt. 11 - 14 VOutput Volt 1 - 1.7 VMass Air FlowAt Idle 3.0 - 6.0 gm/sec2500 rpm 12.9 - 25.3 gm/secCoolant Temp Sensor Ù14 °F (-10°C) 7 - 11.4 kÙ68°F (20°C) 2.1 - 2.9 kÙ122°F (50°C) 0.68 - 1.00 kÙ194°F (90°C) 0.236 - 0.260 kÙIACV-AAC Valve ÙApprox. 10 ÙEGR Temp Sensor Ù32°F (0°C) 7.9 - 9.7 mÙ122°F (50°C) 0.57 - 0.70 mÙ212°F (100°C) 0.08 - 0.010 mÙFuel Tank Temp Sensor Ù68°F (20°C) 2.3 - 2.7 kÙ122°F (50°C) 0.79 - 0.90 kÙIntake Air Temp Sensor68°F (20°C) 2.1 - 2.9 kÙ176°F (80°C) 0.27 - 0.38 kÙ

Electrical Ignition SystemFiring Order1-8-7-3-6-5-4-2Ignition CoilPrimary Voltage 12VPrimary Ù Approx. 0.7 ÙSecondary Ù Approx. 8 kÙBattery Specs.Type 95D31RCapacity 12V / 80 AHDischarge Amp 622 AAlternator Type LR1110-701Nom. Rated Out 12v / 110 AReg. Volt 14.1 - 14.7 VHot Output ampMore than 34 A / 1300 rpmMore than 82 A / 2500 rpmMore than 105 A / 5000 rpm

EPA Mileage Estimate(city/highway) 17/22

Front Wheel Alignment

Toe-inRangeTotal toe-in (A-B) 0.0 - 0.08 in (0 - 2 mm)Total toe-in angle (left + right)0° - 0.17° (0’ - 11’)NominalTotal toe-in (A-B) 0.04 in (1 mm)Total toe-in angle (left + right)0.08° (5’)

Range Nominal Front Wheel Turning Angle (full turn)In/Wheel Range 35.50° - 39.50° 38.50°(38°30’) (35°30’ - 39°30’)Out/Wheel Nominal 32°

CamberRange -1.58° to 0.08° -0.83° (-0°50’) (-1°35’ to 0°05’)Lt/Rt Difference 0.75° (45’)

CasterRange 5.75° - 7.25° 6.50° (6°30’)(5°45’ - 7°15’)Lt/Rt Difference 0.75°(45’)

Kingpin InclinationRange 12.00° - 13.50° 12.75° (12°45’) (12°00’ - 13°30’)

Rear Wheel Alignment

Toe-inRangeTotal toe-in (A-B) 0.0 - 0.08 in (0 - 2 mm)NominalTotal toe-in (A-B) 0.04 in (1 mm)

Total toe-in angle(left + right) 0.00°- 0.17°(0’-10’) 0.08° (5’)

CamberRange -1.58° to -0.08° -0.83° (-0°50’) (-1°35’ to -0°05’)W/Lug Nut Torque 72-87 ft/lb (10-12 kg/m)

Brake System

Brake Model Code Front Disc Brake Rear Disc Brake CL28VF AD11BBrake Fluid DOT 3 (Recommended)Master Cyl. Bore Dia. 1 in (25.4 mm)

Front Disc BrakeCylinder Bore Dia.1.685 in (42.8 mm)Brake Pad DimensionsLength 5.0 in (127 mm)Width 0.433 in (11.0 mm)Thickness 0.433 in (11.0 mm)Brake Pad Wear LimitMin. Thickness 0.374 in (9.5 mm)Brake Rotor DimensionsOuter Diameter 11.02 in (280 mm)Standard Thickness 1.10 in (28.0 mm)Brake Rotor Repair/Wear LimitsMax. Runout 0.0028 in (0.07 mm)Min. Thickness 1.024 in (26.0 mm)Max. Thickness Variation(at least 8 positions) 0.0004 in (0.01 mm) Rear Disc BrakeCylinder Bore Dia1.50 in (38.2 mm)Brake Pad DimensionsLength 3.835 in (97.4 mm)Width 1.335 in (33.9 mm)Thickness 0.39 in (10.0 mm)Brake Pad Wear LimitMin. Thickness 0.059 in (1.5 mm)Brake Rotor DimensionsOuter Diameter 11.50 in (292 mm)Standard Thickness 0.35 in (9.0 mm)Brake Rotor Repair/Wear LimitsMax. Runout 0.0028 in (0.07 mm)Min. Thickness 0.31 in (8.0 mm)Max. Thickness Variation(at least 8 positions) 0.0008 in (0.02 mm))

Brake Pedal Dimen.Free Height 'H' 7.24 - 7.64 in (184 - 194 mm)Depressed Height 'D' 3.94 - 4.33 in (100 - 110 mm)Pedal Free Play 'A' 0.039 - 0.118 in (1.0 - 3.0 mm)Switch Clearance 'C' 0.012 - 0.039 in (0.3 - 1.0 mm)

Brake Booster Model M215TOutput Rod Length 0.4045 - 0.4144 in (10.275 - 10.525 mm)Clevis Length Approx. 5.51 in (140 mm)

Parking Drum Brake DS17HDInside Diameter 6.77 in(172 mm)Brake Shoe DimensionLength 6.07 in(154.1 mm)Width 0.984 in (25.0 mm)Thickness 0.118 in(3.0 mm)Parking Drum Brake Repair/Wear LimitMax Inside Diameter 6.81 in (173.0 mm)Shoe Minimum Thk. 0.059 in (1.5 mm)Parking Brake Control Number of Notches 5 - 6

ABS Wheel SensorClearance Frt 0.0083- 0.028 in (0.21 - 0.71 mm)Clearance Rr 0.0138 - 0.0246 in (0.35 - 0.625 mm)Resistance 0.8 - 1.2 kÙ Wheel Lug Nut 72-87 ft lb (10-12 kg-m)