Mazda MX5 Auto - First generation (NA) Part 3

Mazda MX5 Auto - First generation (NA)

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In November 1993, in an attempt to boost sales, Mazda of Australia introduced an automatic transmission as an option on the MX5 for the first time. Unfortunately, sales continued to decline, and hit an all-time low of just 197 units in 1995.

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For the 1994 model year, the first-generation MX5 was freshened with the introduction of the more powerful 1.8 L (110 cu in) BP-ZE engine, dual airbags and a limited slip differential in some markets. The chassis was substantially braced to meet new side-impact standards, most visibly by adding a "track bar" between the seatbelt towers inside the car, but also to the front and rear subframes. Also, 1994 and 1995 were the only years in which Mazda offered a light metallic blue paint (Laguna Blue Mica), making these cars rare collectors cars to some. 1994 also saw the introduction of the "R" package, a sport-themed package with Bilstein shocks and subtle underbody spoilers, in addition to the removal of unnecessary items such as power steering. No body style changes were made, though.

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The new 1.8 L (110 cu in) engine produced 98 kW (131 bhp), which was then increased by 1 kW (1.3 bhp) for the 1996 model year. The base weight increased to 990 kg (2,200 lb). Performance was improved slightly, the additional power being partly offset by the extra weight. In some markets such as Europe, the 1.6 L (98 cu in) engine continued to be available as a lower-cost option, but was detuned to 66 kW (89 bhp). This lower-powered model did not receive all the additional chassis bracing of the new 1.8 L (110 cu in). Japanese and US cars were fitted with an optional Torsen LSD, which was far more durable than the previous viscous differential.
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Mazda MX5 Auto - First generation (NA) Part 2

Mazda MX5 Auto - First generation (NA)

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The original MX5 came with a 1.6 L (98 cu in) dual overhead cam inline four-cylinder engine, producing 90 kW (120 bhp) at 6,500rpm, and 136 N·m (100 lbf·ft) of torque at 5,500rpm. The engine employs an electronic fuel injection system using a vane-type air flow meter and a camshaft angle sensor instead of a distributor. This engine, codename B61P, had been previously used in the 323 series. Standard transmission was 5-speed manual. Japan and the USA got an optional automatic transmission which proved unpopular; these markets also received an optional viscous limited slip rear differential, although were only available for cars with a manual transmission. To achieve the low introductory price, the base model was stripped. It had steel wheels, manual steering, roll-up windows, and no stereo or AC. Power steering, AC, and stereo were added as standard equipment in later years.

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The NA could reach 60 mph (97 km/h) in 9.4 seconds and had a top speed of 190 km/h (120 mph). This first generation of Miata (often referred to as the NA) included a special edition in 1991, produced in British Racing Green with the first use of tan interior.

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1500 LE (Limited Edition) cars were produced in 1993. This model featured red leather interior, upgraded stereo, Nardi shift knob, leather wrapped steering wheel, cruise, limited slip differential, power windows, power mirrors, power steering, air conditioning, BBS wheels, Bilstein shocks, front and rear spoilers, ABS brakes, stainless sill plates and Harley style peanut tank door speaker trim. All '93 LE cars came in black.
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Mazda MX5 Auto - First generation (NA) Part 1

Mazda MX5 Auto - First generation (NA)

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The MX5 was unveiled at the Chicago Auto Show on February 10, 1989 with a price tag of US$14,000 (US$24,100 in 2008 adjusted for inflation). The MX5, with production code NA, was made available for delivery to buyers worldwide in the following dates: March 1989 in Japan, May 1989 (as a 1990 model) in the U.S.A. and Canada, 1990 in Europe. An optional hardtop was made available at the same time, in sheet moulding compound (SMC). Demand initially outstripped production, fueled by enthusiastic press reviews.

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In Japan, the car was not badged as a Mazda, as the company was experimenting with the creation of different marques for deluxe models, similar to Nissan's Infiniti and Toyota's Lexus (both brands of which launched at the same time as the Miata). Instead, the Mazda MX5 was sold as the Eunos Roadster in that market.

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The body shell of the NA was all-steel with a light-weight aluminium hood. Overall dimensions were 3,970 mm (156 in) in length, 1,675 mm (65.9 in) in width, and 1,235 mm (48.6 in) in height. Drag coefficient was indicated as 0.38. Suspension was an independent double wishbone on all four wheels, with an anti-roll bar at the front and rear. Four wheel-disc brakes, ventilated at the front, were behind alloy wheels with 185/60HR14 radial tires. The base model came with stamped steel wheels from the current 323/Protege.
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Mazda MX5 Auto - From idea to production Part 2

Mazda MX5 Auto - From idea to production

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The first round of judging the competing designs was held in April 1984. At this stage, designs were presented solely on paper. The mid-engined car appeared the most impressive, although it was known at the time that such a layout would struggle to meet the noise, vibration and harshness (NVH) requirements of the project. It was only at the second round of the competition in August 1984, when full-scale clay models were presented, that the Duo 101 won the competition and was selected as the basis for Mazda's new light-weight sports car.

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The Duo 101, so named as either a soft top or hard top could be used, incorporated many key stylistic cues inspired by the Lotus Elan, a 1960s roadster. International Automotive Design (IAD) in Worthing, England was commissioned to develop a running prototype, codenamed V705. It was built with a fiberglass body, a 1.4 L (85 cu in) engine from a Mazda Familia and components from a variety of early Mazda models. The V705 was completed in August 1985 and taken to the U.S.A. where it rolled on the roads around Santa Barbara and got positive reactions.

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The project received final approval on 18 January 1986. The model's codename was changed to P729 as it moved into production phase, under head of program Toshihiko Hirai. The task of constructing five engineering mules (more developed prototypes) was again allocated to IAD, which also conducted the first front and rear crash tests on the P729. While Tom Matano, Mark Jordan, Wu Huang Chin and Koichi Hayashi worked on the final design, the project was moved to Japan for engineering and production details.

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By 1989, with a definitive model name now chosen, the MX5 (as in "Mazda Experiment", project number 5) was ready to be introduced to the world as a true lightweight sports car, weighing just 940 kg (2,100 lb).
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Mazda MX5 Auto - From idea to production Part 1

Mazda MX5 Auto - From idea to production

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In 1976, Bob Hall, a journalist at Motor Trend magazine who was an expert in Japanese cars and fluent in the language, met Kenichi Yamamoto and Gai Arai head of Research and Development at Mazda.

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In 1981, Bob Hall moved to a product planning position with Mazda US and again met Kenichi Yamamoto, now chairman of Mazda Motors, who remembered their conversation about a roadster and gave Hall the go-ahead to research the idea further. At this time Bob Hall hired designer Mark Jordan to join the newly formed Mazda design studio in Southern California. There, He and Bob collaborated on the parameters of the initial image, proportion and visualization of the "light-weight sports" concept. In 1983, the idea turned concept was approved under the "Offline 55" program, an internal Mazda initiative that sought to change the way new models were developed. Thus, under head of project Masakatsu, the concept development was turned into a competition between the Mazda design teams in Tokyo and California.

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The California team proposed a front-engine, rear-wheel drive layout, codenamed Duo 101, in line with the British roadster ancestry, but their Japanese counterparts favored the more common front-engine, front-wheel drive layout or the rear mid-engine, rear-wheel drive layout.
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Mazda MX5 Auto - Generations and Overview Part 2

Mazda MX5 Auto - Generations and Overview

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The body is a conventional, but light, unibody or monocoque construction, with (detachable) front and rear subframes. The MX5 also incorporates a truss marketed as the Powerplant Frame (PPF) which connects the engine to the differential, minimizing flex and contributing to responsive handling. Some MX5s feature limited slip differentials and anti-lock braking system. Traction control is an option available on NC models. The earlier cars weighed in at just over a ton, with engine power output usually 116 bhp (87 kW). The later cars were heavier, with higher power engines.

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With an approximate 50:50 front/rear weight balance, the car has nearly neutral handling. Inducing oversteer is easy and very controllable, thus making the MX5 a popular choice for amateur and stock racing, including, in the USA, the Sports Car Club of America's Solo2 autocross and Spec Miata race series and in the UK the Mazda racing championship.


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Beginning with the third generation, Mazda consolidated worldwide marketing using the MX5 name, though enthusiasts in the USA still refer to it as Miata, a name that means "reward" in Old High German.
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Mazda MX5 Auto - Generations and Overview Part 1

Mazda MX5 Auto - Generations and Overview

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Now in its third generation, the MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997 – with a 1.6 L (98 cu in) straight-4 engine to 1993, a 1.8 L (110 cu in) engine thereafter (with a de-tuned 1.6 as a budget option in some markets) – recognizable by its pop-up headlights. The second generation (NB) was introduced in 1998 with a slight increase in engine power; it can be recognized by the fixed headlights and the glass rear window. The third generation (NC) was introduced in 2005 with a 2.0 L (120 cu in) engine.

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The MX5 was conceived as a small roadster – with light weight and minimal mechanical complexity limited only by legal and safety requirements; technologically modern, but a philosophically direct descendant of the small British roadsters of the 1960s such as the Triumph Spitfire, Austin-Healey Sprite, MG Midget and Lotus Elan.

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The MX5 was designed with a traditional front-engine, rear-wheel drive layout and four-wheel independent double wishbone suspension. It has a longitudinally-mounted four cylinder engine coupled to a manual transmission (5 speed for NA, 5 or 6 speed in NB & NC); an automatic transmission is a cost option.
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