The "M" nameplate has been used on various mid-luxury cars from the Infiniti luxury division of Nissan. The first literation was the M30 Coupe/Convertible, which were rebadged JDM Nissan Leopard. After a long hiatus, the M nameplate was used for Infiniti's mid-luxury sedans (executive cars). First was the short-lived M45 sedan, a rebadged version of the Japanese-spec Nissan Gloria. The next generations, the M35/45 and M37/56/35h/30d, became the flagship of the Infiniti brand and are based on the JDM Nissan Fuga. The M30 had no factory options, but dealers offered the addition of a cellular phone and a CD player/changer. The sole engine was Nissan'sVG30E, a 3.0 L SOHC V6 that produced 162 hp(121 kW) and 180 ft·lbf (244 N·m) of torque, also used by many previous Nissan models such as theMaxima and 300ZX. Like the 300ZX, the M30 was afront-engined and rear-wheel drive vehicle. The transmission was an RE4R01A, four-speedautomatic with overdrive, as enabled or disabled by a button on the shifter. There was no option of a manual transmission. The differential was a Nissan R200-type open differential. It is generally regarded among M30 enthusiasts that the change of powertrain, weak suspension and the lack of options in these categories was a mistake on Infiniti’s part, and perhaps to blame for the lackluster sales. The M30 (coupe) weighed about 3300lbs (1498kgs), and produced 162 hp (121 kW). Unsurprisingly, the M30 convertible weighed even more, due to body and chassis reinforcements. This is regarded as a good thing to some, because the chassis is noticeably stiffer than it is on the coupes. All M30s came equipped with a four-speed automatic transmission.
with the Nissan Sonar Suspension II system that was also installed on the Maxima at the time, which featured a sonar module mounted under the front bumper that scanned the road surface and adjusted the suspension accordingly via actuators mounted on the strut towers. There was also a switch on the center console that allowed the driver to change between "Sport" and "Comfort" settings—essentially "firm" and "soft", respectively.For 1991 and onwards, the M30 received minor improvements. If an exterior door handle was pulled while the doors were locked, the keyhole would illuminate and the interior dome light would come on (coupe). There was also an available central locking switch placed next to the Sonar Suspension II adjuster, although it is not known whether this was a standard feature or option for 1991-92 models. Main gauge cluster text was changed to match the rest of the Infiniti lineup, and engine oil temperature and fuel gauges were switched around. The speedometer was also changed to the electric-type, as opposed to the cable-type used on the 1990 model.
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