The Evolution of the Infiniti I and J Series

Infiniti

Introduction

Infiniti, the luxury vehicle division of Nissan, has a storied history of producing premium sedans and coupes that combine performance, comfort, and advanced technology. Among its most notable lines are the Infiniti I and J series, which have contributed significantly to the brand’s reputation over the years. This article provides an in-depth look into the evolution of these series, detailing their production years, models, and trim levels.

Origins and Early Development

The Infiniti I and J series originated as part of Nissan’s strategic expansion into the luxury market, targeting customers seeking upscale sedans with sporty appeal. The I series mainly encompassed sedans, while the J series included coupes and sportier models.

The Infiniti I Series: Birth and Early Years

First Generation (2000–2003): Infiniti I30

  • Introduction: Launched in 2000, the I series debuted with the Infiniti I30, positioned as a luxury sedan competing with European rivals.
  • Models and Trims:
  • I30 Base: Standard luxury features, 16-inch alloy wheels, leather upholstery, and premium audio.
  • I30 Touring: Added features like sunroof, upgraded audio, and larger wheels.
  • Engine and Transmission:
  • 3.0L V6 engine (VQ30DE), producing approximately 190 horsepower.
  • 4-speed automatic transmission.
  • Features: Dual-zone climate control, leather seats, ABS, traction control.
  • Market Position: Competed against BMW 3 Series and Mercedes-Benz C-Class.

Second Generation (2003–2004): Infiniti I35

  • Introduction: In 2002, Infiniti replaced the I30 with the I35, emphasizing more space and luxury.
  • Models and Trims:
  • I35 Base: Standard features similar to first-gen I30 but with added luxury.
  • I35 Touring: Included sport-tuned suspension and premium features.
  • Engine and Transmission:
  • 3.5L V6 (VQ35DE), 280 horsepower.
  • 4-speed automatic transmission.
  • Features: Navigation options, premium audio, leather interior, wood trim.
  • Market Position: Slightly more upscale, targeting buyers seeking more power and refinement.

The Infiniti J Series: The Sporty Coupe Line

First Generation (2003–2008): Infiniti G35 Coupe and G37 Coupe

  • Introduction: Launched in 2003 as part of Nissan’s “G35” lineup, the J series was primarily embodied by the G35 coupe.
  • Models and Trims:
  • G35 Coupe Base: Equipped with a 3.5L V6, 17-inch alloy wheels, leather seats.
  • G35 Sport: Included sport-tuned suspension, 18-inch wheels, sport seats.
  • G35 Journey: Focused on comfort with additional luxury features.
  • G35 Sport 6MT: Manual transmission option for enthusiasts.
  • Engine and Transmission:
  • 3.5L V6 (VQ35DE), producing 280 horsepower.
  • 5-speed manual or 5-speed automatic transmissions.
  • Features: Bose audio, xenon headlights, Bluetooth, navigation.
  • Special Editions: Limited edition models with unique trims and features.

Renaming to G37 (2008–2013):

  • In 2008, the G35 coupe was renamed G37, aligning with Nissan’s updated naming conventions.
  • Models and Trims:
  • G37 Coupe 6MT: Manual transmission, sport suspension.
  • G37 Coupe Sport: Added sport-tuned suspension, better brakes.
  • G37 Coupe IPL (Infiniti Performance Line): High-performance variant with upgraded engine and suspension.
  • G37 Coupe Journey: Comfort-focused trim with luxury features.
  • Engine and Transmission:
  • 3.7L V6 (VQ37VHR), 330 horsepower.
  • 6-speed manual or 7-speed automatic transmissions.
  • Features: Navigation, premium audio, leather seats, rearview camera.
  • Special Editions: IPL (Infiniti Performance Line) models, with enhanced performance and styling.

Evolution of the Infiniti I Series (2004–2019)

Third Generation (2004–2009): Infiniti G35 Sedan and G37 Sedan

  • Introduction: The G35 sedan was refreshed in 2004, with a focus on increased luxury and updated styling.
  • Models and Trims:
  • G35 Sedan: The standard model with a 3.5L V6.
  • G35 Sport: Sport-tuned suspension, sport seats.
  • G35 Journey: More luxury features, wood trim.
  • Facelift (2007): Slight exterior updates, revised interior, improved technology.
  • G37 Sedan (2008–2013): Replaced G35, with more powerful engine and new styling.
  • Engine and Transmission:
  • 3.5L V6 (G35), 280 hp.
  • 3.7L V6 (G37), 330 hp.
  • 5-speed automatic, later models upgraded to 7-speed transmissions.
  • Features: Infiniti’s Intelligent Key, Bose audio, navigation, leather upholstery.
  • Performance Variants: G37 Sport, G37 IPL.

Fourth Generation (2014–2019): Infiniti Q50

  • Introduction: The G-series was renamed Q50 in 2014, marking Infiniti’s shift to a new nomenclature.
  • Models and Trims:
  • Q50 2.0t: 2.0L turbocharged four-cylinder.
  • Q50 3.0t: 3.0L twin-turbo V6.
  • Q50 Red Sport 400: Top-tier with 400 horsepower.
  • Q50 Hybrid: Hybrid powertrain combining a turbocharged engine with electric motors.
  • Engine Options:
  • 2.0L turbo I4, 208 hp.
  • 3.0L twin-turbo V6, 300 hp.
  • 3.0L twin-turbo V6 (Red Sport), 400 hp.
  • Transmission: 7-speed dual-clutch automatic.
  • Features: ProPILOT Assist, Infiniti InTouch, premium audio, advanced safety.
  • Performance and Tech: Focus on driver-assistance and connectivity.

The Infiniti J Series: The Evolution Continues

Second Generation (2010–2013): Infiniti G37 Coupe and G37 Convertible

  • Design and Features: Maintained the sporty coupe look with refined styling, new interior options.
  • Models and Trims:
  • G37 Coupe Sport: Enhanced suspension, sport seats, 19-inch wheels.
  • G37 Convertible Sport: Open-air driving experience with similar performance features.
  • Engine: Same 3.7L V6 (VQ37VHR), 330 horsepower.
  • Transmission: 6-speed manual or 7-speed automatic.
  • Special Editions: Limited editions with unique interior/exterior packages.

Transition to Q60 (2016–Present):

  • The G37 coupe and convertible evolved into the Q60 line, reflecting Infiniti’s new naming strategy.
  • Q60 Models:
  • 2.0t, 3.0t, Red Sport 400.
  • Available with rear-wheel drive or all-wheel drive.
  • Features: Advanced driver-assist, infotainment, sporty styling.

.

RepairSurge Online Repair Manuals Replace Bulky Books With Reliable Digital Information!
Faster And Cheaper Than Traditional Printed Manuals, Users Get Instant Access To The Repair Information They Need For Any Car, Truck, Van or SUV.

ACCESS REPAIR MANUALS NOW

.

Notable Technological and Design Trends

Throughout their evolution, the Infiniti I and J series have incorporated several technological advancements:

  • Performance Enhancements: Transition from naturally aspirated engines to turbocharged V6s, especially in the later models.
  • Safety Features: Progressive inclusion of advanced safety systems like lane departure warning, adaptive cruise control, and blind-spot monitoring.
  • Interior Comfort: From basic luxury to high-end materials, heated and ventilated seats, premium audio, and customizable ambient lighting.
  • Technological Integration: The adoption of infotainment systems like Infiniti InTouch and ProPILOT driver assistance.

Summary and Legacy

The Infiniti I and J series have played a pivotal role in establishing Infiniti as a premium brand capable of competing with established European luxury automakers. The I series, primarily represented by the G and Q50 lines, evolved from basic luxury sedans to technologically sophisticated, high-performance vehicles. Meanwhile, the J series, represented by the G35 and G37 coupes and convertibles, cemented Infiniti’s reputation for sporty, stylish coupes.

Over nearly two decades, these series reflected broader industry trends: increased emphasis on safety, technology, and performance. Their models and trim levels provided options for diverse customer preferences, from sporty enthusiasts to luxury-focused buyers.

Today, Infiniti continues to evolve its lineup, with the Q50 and Q60 serving as modern embodiments of the brand’s commitment to innovation, performance, and luxury. The legacy of the I and J series remains embedded in Infiniti’s heritage, exemplifying a blend of sporty dynamics and premium refinement.

Conclusion

The evolution of the Infiniti I and J series showcases a journey from traditional luxury sedans and sporty coupes to high-tech, performance-oriented vehicles. Their years of production, from 2000 through the late 2010s, mark a period of significant innovation and stylistic refinement. As Infiniti moves forward, the legacy of these series continues to influence new models and the brand’s overall direction.

Similar Posts