The Infiniti G is a compact executive/entry-level luxury car produced by Nissan's luxury brand Infiniti. The first two generations of the Infiniti G (P10 and P11) were sedans based on the Nissan Primera. Beginning with its third generation (V35), the Infiniti G have been rebadged versions of the Nissan Skyline line of sedans and coupes that were exported to the United States and Canada. The current incarnation is the fourth generation (V36) which introduced the hardtop coupe convertible. The Nissan FM platform, on top of which the 3rd and 4th generations (V35 and V36) of the Infiniti G have been built, also underpins the Nissan 350Z and has shared components with the Infiniti M, Infiniti EX, and Infiniti FX.In 2007, the redesigned G coupe was unveiled at the 2007 New York International Auto Show and was available for sale as a 2008 model. Unlike the 2007 and 2008 G sedan it was given the new 3.7 L 330 hp (250 kW) V6 VQ37VHR engine but for this one model year still paired with the 5-speed automatic transmission and was named the "G37." In Japan, the G37 joined the updated G Sedan under the Nissan Skyline (V36) nameplate. This also marks the first use of Nissan's VVEL (Variable Valve Event and Lift) system on a production vehicle in the US market.Infiniti G37 Video Review - Kelley Blue Book
For the 2009 model the G35 sedan was replaced by the G37 sedan. The G37 sedan was first unveiled at the Geneva Motor Show for the European market. Exterior, interior and options remain identical to the 2008 G35 model range but the sedan now also sports the 3.7-liter VQ37VHR "VVEL" V6, rated 328 hp (245 kW) at 7,000 rpm and 269 ft·lbf (365 N·m) at 5,200 rpm that was previously introduced in the G37 Coupe. Although the engine gains only 0.2 kg·m (2 N·m; 1 ft·lbf) peak torque over the VQ35HR and this torque value arrives at a later 5,200 rpm vs. 4,800 in the VQ35HR, the torque curve itself is improved and flattened across the rpm range via Nissan's new VVEL (Variable Valve Event and Lift) variable valve timing resulting in better throttle response and low rpm torque. The G37s VQ37VHR engine has been touted by car magazines and reviewers as an improvement over the VQ35HR engine mostly adding much more refinement and smoother engine operation, especially at high rpm where the VQ35HR engine was frequently criticized for NVH and sounding strained, harsh and loud. The often criticized too aggressive clutch engagement, notchiness of the 6-speed manual in the G35 and engine vibrations transferred through the shifter and pedals in the G35 6MT cars was also addressed in the new G37 models.All 2009 models came standard with Infiniti's new 7-speed automatic transmission that was also introduced on the 2009 FX35 and FX50. A much welcomed improvement over the previous 5-speed box. To equip the G37 Sedan or Coupe with a 6-speed manual transmission the Sport 6MT model must be specified. Base, Journey and X models cannot be ordered with manual transmissions, however the Sport Package including all sport options of the 6MT model (except the manual transmission) can be added to the Journey and X models. The 2009 sport package (standard on Sport 6MT cars, optional on Journey and X models) now also included larger sport brakes with 4-piston front/2-piston rear calipers with 14-inch (360 mm) ventilated front rotors and 13.8-inch (350 mm) ventilated rear rotors, a new sport wheel design 18-inch (460 mm) for the Sedan and 19-inch (480 mm) on the Coupe, and Viscous Limited-Slip Differential (VLSD). The Sport Package on G37 x AWD Sedans does not include the larger opposed piston brakes. Brakes on non Sport models are front 13-inch (330 mm) ventilated discs and rear 13-inch (330 mm) ventilated discs with sliding calipers. The G37 is available as G37, G37 Journey, G37S 6MT and G37x AWD models. Major option packages remain to be the Premium Package, Sport Package, Nav Package, Tech Package. All 2009 models come standard with self healing "Scratch Shield" paint which employs a soft polymer top coat that can self heal small scratches and swirl marks.
Even though the final drive ratio for vehicles equipped with the 7-speed automatic has been (numerically) reduced from 3.69 to 3.36, the new 7-speed automatic has much lower first through fourth gear overall ratios than the old 5-speed automatic and the 6-speed manual in the 6MT cars (which retain the old 3.69 final drive ratio). Giving it closer gear ratios in all gears, to match engine rpm better with power demand, brings better acceleration while overdrive ratios in 6th and 7th gears reduces highway cruising rpm and improves fuel mileage. The new 7-speed automatic retains the Drive Sport (DS) shift mode and Downshift Rev Matching (DRM) feature of the previous 5-speed automatic. Paddle shifters are standard on G37S models equipped with the 7-speed automatic. The new engine/transmission combo did add some weight the car (3,590 lb. for the G37 vs. 3,508 for the G35 in identical trim). G37x Coupe uses an ATTESA E-TS all-wheel drive system. G37 coupe and sedan were set on sale in September 2008 as 2009 models. G37x Coupe and G37 sedan were unveiled in 58th annual Pebble Beach Concours d'Elegance. Pictures of G37 convertible was first shown in Monterey, while the vehicle itself would be unveiled in 2008 Los Angeles Auto Show in November. The 2009 Infiniti G37 Anniversary Art Project Vehicle - This is a version of G37 Sport Coupe inspired by Cirque du Soleil to commemorate Infiniti's 20th anniversary. The vehicle was designed by Montreal artist Heidi Taillefer. The vehicle was set on tour at various Cirque du Soleil shows and other events, with eventual vehicle sale at charity auction. G37 Convertible was introduced in June 2009 Media Release as a 2009 model on the V36 FM platform and is only from a design perspective based on the G Coupe. The G Convertible came equipped with a standard 325 horsepower (242 kW) 3.7-liter V6, backed by a choice of a 7-speed automatic transmission with available magnesium paddle shifters or a responsive close-ratio 6-speed manual transmission.