From Acura press: The intention in creating the Acura NSX, which was first introduced for the 1991 model year, was to produce a hand-built, exotic, mid-engine sports car that would establish entirely new levels of prestige, performance, refinement, driveability and reliability. The aluminum-bodied NSX is designed to represent an entirely new definition of the exotic sports car through state-of-the-art, lightweight technology.
As the NSX has evolved during the 1990s, it has been hailed as a technological showcase.
The NSX-T model introduced during the 1995 model year, which features a removable roof panel, created a different level of excitement and broadened the appeal of the NSX. It also succeeded in maintaining the extremely high levels of performance and sophistication established by the NSX coupe.
It also included technological achievements such as an optional Formula One-inspired SportShift automatic transmission with a unique column-mounted electronic shifter, a drive-by-wire throttle system, standard variable electric power-assisted steering, a compact and efficient system pioneered in the firstyear NSX equipped with the automatic transmission.
For 1997, the NSX/NSX-T takes a giant step forward in performance with several major enhancements - most notable of which is a larger, more powerful 3.2-liter V-6 engine with a new 6-speed manual transmission.
Significant engineering updates also were made to the powertrain, brakes and steering. The new standard engine on the NSX is an all-aluminum, 90-degree, 3.2-liter (3179 cc), dual-overhead-cam, 4-valve-per-cylinder V-6 which produces 290 horsepower at 7100 rpm and 224 lbs-ft of torque at 5500 rpm. It is mated to an all-new 6-speed close-ratio manual transmission. Redline is at 8000 rpm.
The optional electronically controlled 4-speed automatic transmission comes with an all-aluminum, 90-degree, 3.0-liter (2977 cc), dual-overhead-cam, 4-valve-per-cylinder V-6 which 252 horsepower at 6600 rpm and 210 lbs-ft of torque at 5300 rpm. Redline is at 7500 rpm.
An exclusive electronically controlled Variable Valve Timing and Lift Electronic Control (VTEC) system optimizes volumetric efficiency at both high and low engine speeds. A unique Variable Volume Induction System changes the configuration of the intake system with varying engine speeds, working with the VTEC system to broaden the torque curve and increase peak power output. The new 3.2-liter engine boasts a new stainless steel exhaust header system to improve engine breathing. To increase the displacement of the 1997 NSX to 3.2 liters, the bore was increased from 90 to 93 mm.
Despite increases in horsepower and displacement, engine weight was reduced by 2.4 kilograms. To achieve both light weight and durability, the block is made of aluminum alloy. The cylinders on the new 3.2-liter V-6 are now made using an advanced metallurgical technique called Fiber Reinforced Metal (FRM), in which an alumina-carbon fiber is cast into the traditional aluminum alloy for enhanced rigidity. This process not only allows displacement to be increased without increasing bore centers.