While the NSX always was intended to be a world-class sports car, engineers had made some compromises in order to strike a suitable balance between raw performance and daily driveability. For those NSX customers seeking a no-compromise racing experience, Honda decided in 1992 to produce a version of the NSX specifically modified for superior on-track performance at the expense of customary creature comforts. Thus, the NSX Type R (or NSX-R) was born. Honda chose to use its moniker of Type-R to designate the NSX-R's race-oriented design.
Honda engineers started with a base NSX coupe and embarked on an aggressive program of weight reduction. Sound deadening, the audio system and the entire air conditioning system were removed. The power leather seats were replaced with lightweight carbon fiber racing seats manufactured for Honda by Recaro. The stock alloy wheels were replaced with forged aluminum wheels produced by Enkei, which reduced the car's unsprung weight. The stock leather shift knob was replaced with a sculpted titanium piece. Overall, Honda managed to remove approximately 120 kg (265 lb) of weight, giving the NSX-R a final weight of 1,230 kg (2,712 lb).
Turning to the suspension, it was well known by 1992 that the NSX, due to its mid-engine layout and rear-end link travel, was susceptible to a sudden oversteer condition during certain cornering maneuvers. While this condition rarely occurred during spirited street driving, it was much more prevalent on race tracks where speeds were much higher. To address the problem and improve the NSX-R's cornering stability at the limit, Honda replaced the entire suspension with completely new springs and dampers.
The stock NSX has a rear bias in its spring rates, where the rear springs are stiffer than the front. On hard deceleration upon corner entry, the softer front springs allow weight transfer to the front wheels, increasing front grip and thus improving steering response. However, the weight transfer also takes weight off of the rear wheels, causing them to lose grip. The net result is a tendency toward oversteer, as the rear wheels are more likely to break traction and cause a fishtail (drift) or spin. For the NSX-R, Honda reversed the spring bias, placing stiffer springs on the front suspension. This had the effect of preventing weight transfer to the front suspension under hard braking. This way, the rear tires would remain firmly set when entering the corner. Of course, by keeping weight off of the front wheels, front grip was reduced and the change therefore had the negative effect of increasing the understeer tendency of the car. This change required better driver skill to manage. Overall, the NSX-R uses much stiffer springs than the stock NSX (F 3.0 kg/mm—R 4.0 kg/mm for the NSX versus F 8.0 kg/mm—R 5.7 kg/mm for the NSX-R).
Honda also increased the final drive ratio by adding a 4.235:1 ring and pinion gear in place of the 4.06:1 stock unit, which moved the NSX-R's shifts further into the power band at the expense of top end performance.
The lightest of all NSX variants at 1,230 kg (2,712 lb), the First-Gen NSX-R is capable of blistering track performance, though the ride can be jarring and noisy due to the stiff spring rates and lack of sound insulation.
Beginning in 1992, Honda produced a limited number of 483 NSX-R variants exclusively for the Japanese domestic market (JDM). Air conditioning and the stereo system were available for a hefty premium as optional items. Production ended in 1995.
