Toyota Supra

In April 1978, Toyota began production of the Supra in Japan, as the Celica XX, and sold it alongside the Celica at Japanese dealership sales channels called Toyota Corolla Store.

The Supra was offered with a 125 PS (92 kW; 123 hp) 2.0 L 12-valve SOHC inline-six engine (M-EU, chassis code MA45) or the 82 kW (110 hp; 111 PS) 2.6-liter 12-valve SOHC inline-six engine (4M-E, chassis code MA46). The Japanese model was equipped with the smaller 2.0 L engine so that buyers would not incur an additional tax under vehicle size and engine displacement regulations. Both engines were equipped with electronic fuel injection.[6][9] The installation of the larger engine did obligate Japanese buyers to pay a higher annual road tax, making owning the car more expensive than the smaller Celica.

The Supra was first exported outside Japan in January 1979.[10] The federalized model was originally equipped with a 110 hp (82 kW; 112 PS) 2.6-liter 12-valve SOHC inline-6 engine.

Transmission options for the model were either a 5-speed manual (W50) or an optional 4-speed automatic transmission (A40D). Both transmissions featured an overdrive gear. The top gear in the 5-speed was its overdrive gear whereas the automatic transmission featured an overdrive gear that would engage at speeds over 56 km/h (35 mph). The drivetrain for the Supra retained the T series solid rear axle configuration of the Celica in the Japanese MA45 version and a larger F series (and optional Limited Slip Differential) in the MA46 and MA47. The car also came standard with 4-wheel disc brakes and featured a four-link rear suspension with coil springs, lateral track bar, and stabilizer bar. The front suspension consisted of MacPherson struts and a stabilizer bar.

The interior of the Supra had optional power windows and power locks as part of the convenience package. The convenience package also included cruise control and special door trim with door pull straps with an optional sunroof. As for standard features, in the centre console there was an extendable map light and a flip-top armrest, which provided storage. Some other features were the tilt steering wheel, deep zippered pockets on the backs of the front seats, and a tonneau cover under the liftback. The dashboard also contained a state of the art AM/FM/MPX 4-speaker stereo radio, analog clock, and tachometer as part of the instrument panel.

The mid-1979 changes for the 1980 model year US model were mostly cosmetic. The interior received a redesigned center console and a digital quartz clock. On the exterior were redesigned side view mirrors and 14x51⁄2 inch aluminum wheels were standard (the previous year had steel wheels with plastic wheel covers as standard and the aluminum wheels were optional). In addition, body molded mudflaps became available. On cars finished in copper metallic and white, the mudflaps were painted the body colour while the mudflaps were left black on all other colours. On the rear of the mudflaps, the word "Celica" was painted in white lettering.[11]

The official Supra site[6] also notes that there was an addition of optional leather-trimmed seating and automatic climate-control.

1981 Supra with Sports Performance Package (MA47, US)

In August 1980 (for the 1981 model year), the Supra received an upgrade in displacement with the 2.8-liter 5M-E engine. It was still a 12-valve SOHC engine, but had a power output of 116 hp (87 kW; 118 PS) and 145 lb⋅ft (197 N⋅m) of torque. The car's automatic transmission was changed to the revised Toyota A43D and it gained a revised final drive gearing. Because of the change in engine and transmission a new chassis code of MA47 was given to the 1981 model. Performance figures for this model include a 0–60 mph (97 km/h) acceleration time of 10.24 seconds and a 1/4-mile time of 17.5 seconds at a speed of 77.7 mph (125 km/h).[12]

Also in 1980 (for the 1981 model year), a new Sports Performance Package became an option, which included sport suspension, raised white letter tyres, and front and rear spoilers. This also marked the last year that an 8-track tape player was offered in any Supra.[6][11]

1979 Toyota Celica XX 2000G (MA45)

The Celica XX (pronounced "double X"[13]) is the Japanese market name of the first generation of the Celica Supra. It was offered in Japan during the years 1978–1981, and was redesigned in 1981. Toyota obtained engineering assistance from Lotus Cars, and supplied some components for use in the Lotus Excel. The Supra was sold as the Celica XX only in Japan at Japanese dealership sales channels called Toyota Corolla Store. In worldwide markets, it was sold as the Celica Supra.

In 1981, the Celica XX introduced the world's first navigation computer.[14]

In the North American market, the Celica Supra was available in two distinct models. There was the "Performance Type" (P-type) and the "Luxury Type" (L-type). While being mechanically identical, they were differentiated by the available options; tire size, wheel size, and body trim. The P-type had fiberglass fender flares over the wheel wells, while the L-type did not. The P-type was also standard with the more sporty eight-way adjustable seats. The P-type did not get the option of a leather interior until 1983. Initially, the Luxury type meant Automatic transmission, and Performance Type stood for Manual. All editions of the P-type had the same 14x7-inch aluminum alloy wheels and throughout the years the L-type had 14x5.5-inch wheels until 1985 when they were changed to a P-type styled 15x6. The L-type also had the option of a digital instrument cluster with a trip computer; some Canadian models (both L-types and P-types) had this option as well as a few rare instances of American models. The L-type cluster was easily distinguished from the P-type cluster, by the 'ECT' function written on the dial plate. The digital cluster featured a digital tachometer, digital speedometer, and electronic fuel level and coolant level gauges. The trip computer could calculate and display various things such as fuel economy in miles-per-gallon, estimated time of arrival (ETA), and distance remaining to destination. Supras with trip computers also came with cruise control. Excluding the 1982 model, all P-types were available with headlight washers as an option, but the L-types were never given such an option. Although gear ratios changed throughout the years, all P-types came standard with a limited slip differential.

1982 Toyota Supra 2.8i L-Type (MA61)

For 1982, in the North American market, the Celica Supra's engine was the 2.8-liter 12-valve (two valves per cylinder) DOHC 5M-GE. Power output was 145 hp (108 kW; 147 PS) SAE net and 155 lb⋅ft (210 N⋅m) of torque. The engine used an 8.8:1 compression ratio to achieve the power and featured a vacuum advanced distributor. When the car debuted, it had a drag coefficient of Cd=0.348, a 0–60 mph (0–97 km/h) acceleration time of 9.8 seconds and a 1⁄4 mile (400 m) time of 17.2-seconds at 80 mph (129 km/h).[16]

The standard transmission for this year was the W58 5-speed manual with the A43DL 4-speed automatic transmission being an option for L-types. Both transmissions featured an overdrive gear and the automatic featured a locking torque converter. The top gear in the 5-speed was its overdrive whereas the automatic transmission featured an overdrive gear that would engage at speeds over 56 km/h (35 mph). The 1982 model's rear differential featured a 3.72:1 ratio. The Celica Supra's four-wheel independent suspension was specially tuned and designed by Lotus and featured variable assisted power rack-and-pinion steering and MacPherson struts up front. At the rear, it had semi-trailing arm suspension with coil springs and a stabilizer bar. Braking on the Celica Supra was handled by four-wheel disc brakes.

On the interior, this generation had standard power windows, power door locks, and power mirrors as well as a tilt steering wheel. The power door lock was located in the center console next to the power mirror control. The analog dash of this model only showed a top speed of 88 mph (142 km/h) in North America. The optional automatic climate control was renovated and was now seen as a standard feature on the A60. Cruise control and a retractable map light was standard in this generation. Some options included the addition of a sunroof, two-tone paint schemes, and a five-speaker AM/FM/MPX tuner with a cassette player (Fujitsu Ten Limited). The optional cassette stereo had a 105-watt power amplifier and a seven-band graphic equalizer. The standard stereo was a five-channel AM/FM/MPX tuner. Leather interior was an option on the L-type model, but the P-type models limited to standard striped cloth interior.

The AM/FM antenna was integrated into the front windshield rather than a typical external mast antenna. There was a key lock on the gas tank door (in lieu of a remote release) and the hatch and rear bumper were black regardless of exterior colour on the rest of the car. The P-type was available with an optional rear window visor above the hatch glass. The tail lights had a reverse light in the centre and the door handles opened the doors by pulling sideways. The front nose badge and B-pillar only read "Supra" for the first several months of production, but were changed to read "Celica Supra" midway through the model year. The L-type had front and rear mudflaps but P-type of this year did not.

There were not many changes for the 1983 model year, but there was an increase in power output to 150 hp (112 kW; 152 PS) and 159 lb⋅ft (216 N⋅m) of torque from the same 5M-GE engine. The only real change in the engine area was the switch from a vacuum advanced to an electronic advanced distributor, yet that did not increase the power output. Toyota switched to a 4.10:1 rear gear ratio for the P-type and a 3.73:1 for the L-type. As for the optional automatic transmission, they replaced the A43DL 4-speed with a newly designed A43DE 4-speed. It had an electronic controller that would adjust its shift pattern for a balance between performance and economy. It was the first in the industry to provide an electronically controlled transmission (ECT). This allowed the driver to choose either the "power" driving mode or "normal" driving mode at the touch of the button. The power mode provided the quickest acceleration and the normal mode provided the best all-around performance.

The interior virtually had no changes, but changes to the exterior included a switch to a power mast antenna, mudflaps on all models, and the addition of headlight washers on the P-type. All B-pillar and nose badges for cars sold in North America read "Celica Supra" and only the P-type was available in two-tone colour schemes.

1984 Toyota Supra 2.8 P-Type (MA67)

Changes for the 1984 model year were significant. Power output was increased on the 5-speed models to 160 hp (119 kW; 162 PS) and 163 lb⋅ft (221 N⋅m) of torque. The increase was achieved by a mixture of a redesigned intake manifold with "D"-shaped intake runners and an increase in compression ratio to: 9.2:1.[5] Another notable change in the 5-speed models was the switch to a 4.30:1 gear ratio in the rear differential. All automatic models retained the previous years power statistics, but the rear gear ratio was changed to 4.10:1.

The most notable exterior changes included the switch to wraparound front turn signals, the option of either a rear wing spoiler mounted high up on the rear hatch, or rear window and quarter window louvers. Also, the tail-lights were redesigned and the hatch received a billboard "Supra" sticker instead of the smaller sticker, which was previously positioned on the right. The rear hatch and bumper was changed and received the same colour as the rest of the car (instead of the black of previous years). The door handles were also switched, opening by pulling up instead of sideways. Two-tone paint schemes also became available on both the P-type and L-type models.

Some interior controls such as the steering wheel, cruise control, and door lock switch were redesigned. Toyota included a 130 mph (209 km/h) speedometer in North American models instead of the traditional 85 mph (140 km/h) speedometer and the automatic climate control display was also changed. The previous year's cassette and equalizer stereo option was now made a standard feature.

1986 Toyota Supra 2.8 with the third brake light (MA67)

The Supra was redesigned again in 1985. Power output was marginally increased to 161 hp (120 kW; 163 PS) and torque was up to 169 lb⋅ft (229 N⋅m). All models of this year had the same amount of power (both automatic models and 5-speed models). The engine received a redesigned throttle position sensor (TPS) as well as a new EGR system and knock sensor. With the slight increase in power the Supra was able to propel itself from 0–60 mph (97 km/h) in 8.4 seconds and netted a 16.1 second quarter-mile at 85 mph (137 km/h).[17]

Other changes would be a redesigned, more integrated sunshade and spoiler on the rear hatch. The rear spoiler was changed from a one-piece to a two-piece. The option of a leather interior remained exclusive now for the P-Type. Toyota added a standard factory theft deterrent system and the outside mirrors were equipped with a defogger that activated with the rear defroster. All Supras this year received automatic-off lights that also encompassed an automatic illuminated entry and fade-out system.

While 1985 was to be the last year of production of the second generation model, delays in production of the third generation model led to a surplus of second generation models. During the first half of 1986 the 1985 P-type was still offered for sale, with only minor cosmetic changes as well as the addition of a now mandatory rear-mounted third brake light on the hatch. These were all labelled officially as 1986 models. The P-type were the only model available for the 1986 model year. Production for the A60 Supra ended in December 1985 in order to make way for the upcoming A70 Supra.

1982-1983 Toyota Celica XX 2800GT (MA61)

1983–1986 Toyota Celica XX 2000GT Twin Cam 24 (GA61)

The second generation of the Supra came in a variety of options around the world as well as only being offered during select years.

From August 1982 to 1983, the Celica XX, as it was named in Japan, had fender mirrors and came in four models depending on the engine:[18]

• 2800GT Twin Cam: 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GEU 160 PS (118 kW; 158 hp) and 150 lb⋅ft (203 N⋅m) of torque.
• 2000GT Twin Cam 24: 1,988 cc (1.988 L; 121.3 cu in) DOHC 1G-GEU 160 PS (118 kW; 158 hp) and 134 lb⋅ft (182 N⋅m) of torque.
• 2000 Turbo: 1,988 cc (1.988 L; 121.3 cu in) SOHC turbocharged M-TEU 145 PS (107 kW; 143 hp) and 21.5 kg⋅m (211 N⋅m; 156 lb⋅ft) of torque.
• 2000: 1,988 cc (1.988 L; 121.3 cu in) SOHC 1G-EU 125 PS (92 kW; 123 hp) and 17.5 kg⋅m (172 N⋅m; 127 lb⋅ft) of torque.

From August 1983 to 1986, the Celica XX had door-mounted mirrors and the same four engines options but with performances improvements. The 5M-GEU engine compression ratio was increased to achieve 175 PS (129 kW; 173 hp) and 177 lb⋅ft (240 N⋅m) of torque and the M-TEU engine upgraded with an air-to-liquid intercooler to 160 PS (118 kW; 158 hp) and 23.5 kg⋅m (230 N⋅m; 170 lb⋅ft) of torque.[19]

• Sold from August 1982 to 1986.[15]
  • 82–83: 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GE 130 kW (174 hp; 177 PS) and 207 lb⋅ft (281 N⋅m) of torque. Analog instrument cluster, no fender flares.
  • 84–86: 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GE 170 PS (125 kW; 168 hp) and 212 lb⋅ft (287 N⋅m) of torque. Digital dash, P-Type fender flares.

• Sold from 1982 to 1986.
  • 82–83: 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GE 178 hp (133 kW; 180 PS) and 212 lb⋅ft (287 N⋅m) of torque. Analog dash, no fender flares.
  • 84–86: 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GE 178 hp (133 kW; 180 PS) and 212 lb⋅ft (287 N⋅m) of torque. Digital dash, P-Type fender flares.

• Sold from 1984 to 1986 - these had a version of the earlier single-cam engine as it was not worth the expense of making the twin cam engine meet the particular emissions regulations shared by these three countries. This particular engine was also used in the Cressida and the Crown in the Swiss market.
  • 2,759 cc (2.759 L; 168.4 cu in) SOHC 5M-E 140 PS (103 kW; 138 hp) and 167 lb⋅ft (226 N⋅m) of torque.
  • The Supra in Australia was sold from 1983 to 1986 had a digital instrument cluster, fender flares, 14x7-inch wheels, 84 style lights, single piece spoiler, LSD and optional sunroof. This was the only variant and no L Type model was offered.
• In Australia, the Supra (manufactured between 1982 and 1990), was assessed in the Used Car Safety Ratings in 2006 as providing "worse than average" protection for its occupants in the event of a crash.

• Sold from 1984 to 1985
  • 2,759 cc (2.759 L; 168.4 cu in) DOHC 5M-GE 133 kW (178 hp; 181 PS) and 212 lb⋅ft (287 N⋅m) of torque. Digital dash, P-Type fender flares.

The third generation of the Supra was introduced in February 1986 as a stand-alone model, officially being separate from the Celica. Whereas the Celica became a front-wheel-drive sport coupe, the Supra retained its image as a rear-wheel-drive sports/GT car. The new Supra would continue to move upscale and become a showcase for Toyota's technology. The Supra was powered by a 3.0-litre DOHC inline six-cylinder engine rated at 149 kW (200 hp; 203 PS). Notable features included an electronically controlled independent suspension (called the Toyota Electronic Modulated Suspension – TEMS), and some came with a removable Sport-Roof panel (Targa top).

The A70 Supra Turbo was introduced in 1987. The inter-cooled, turbocharged version of the 3.0-litre inline 6-cylinder engine boosted power to 172 kW (231 hp; 234 PS) and 240 lb⋅ft (325 N⋅m) of torque. The engine, designated as 7M-GTE, was one of the first distributor-less mass production engines in the United States. This was accomplished with 3 coils being shared using the wasted spark system. The Turbo model also included an engine oil cooler and an integrated rear spoiler. The sports package, which was standard on the Turbo and optional on the base model, included a limited slip differential (LSD), TEMS, and headlamp washers. A new 4-channel Anti-Lock Braking System (ABS) was optional on both models. In 1987, a new beige/tan colour combination was implemented, and only 1,000 cars were produced with this scheme. Toyota installed its variable induction technology into the DOHC twin-turbocharged 1G-GTE engine called T-VIS and also included it into the 7M-GTE engine as well.

Changes for the 1988 model year were nominal with the exception of the discontinuation of two-toned brown exterior paint. The spoiler mounted brake light changed from a square to a trapezoid shape. Seat pattern was changed from squares to lines, and "foil" on climate control and switch gear changed from light to dark gray. Japanese buyers could select from six different trim packages starting with the top level 3.0 GT Turbo Limited with the 7M-GTEU engine, followed by the 3.0 GT Turbo, GT Twin Turbo with the 1G-GTEU DOHC 2.0 L engine, the GT with the 2.0 L DOHC 1G-GEU engine, the G with the 1G-EU engine and the S with the 1G-EU engine as the base model. All Japanese models came with either a 5-speed manual transmission or the 4-speed automatic transmission with ECT-s except the G and the S on which the ECT-s wasn't available. In Japan, the 3.0 GT Turbo Limited, the 3.0 GT Turbo and the GT Twin Turbo were installed standard with a digital instrument panel, the 3.0 L models came with an AM/FM Cassette stereo with an integrated CD player and cruise control. Climate control was also standard on all turbocharged models, and leather interior was only available on the GT Turbo Limited.

Changes for the 1989 model year include modifications to the wastegate actuator, feed location and engine management increased power output by 1.5 kW (2 hp; 2 PS) on the turbo model. The engine mount and brace were also revised in late 1989. The changes made to the cross member and mounts made to accommodate the (1JZ engine) for Japanese models. The protective body molding was also changed by taking away the steel reinforcement. This made the molding lighter and prevented the rusting problem found on the previous year models. The "white package" was introduced as well, featuring white body molding and white "saw blade" wheels. Interior choices were limited to blue and burgundy only. Other than pure cosmetics changes, there was nothing different from other models. All models received rear 3-point seat belts to replace the previous years' two-point lap belts. New tail lights, front bumper with integrated lower grille (as opposed to the previous years' detachable grille), side mirrors, turn signals, upper grilles, foglights, steering wheel, door panels, climate control, window switches and bezels, and stereo are added. Addition of coat hooks on B-pillar and removal of rear seat pockets round out interior changes. Turbo models received three piece spoiler with an integrated LED brake light. 1989 also marked the end of headlight washers in the US and SuperMonitor; an advanced system offered by Toyota able to calculate miles able to be traveled on current tank, ability to check vehicle codes from inside the cabin, among other features.

1990 Toyota Supra 3.0i turbo (MA70)

For the 1990 model year, changes included larger protective laminate in front of rear wheels, lower redline (owing to the heavier crank with cylinders 2 & 5 counterbalanced), redesigned steering wheel with cruise control relocated to a stalk on the right side. In addition to an airbag and airbag indicator light on dashboard, the left side of the switch panel was also redesigned, which replaced one of the coin slots with the dimmer. The lower dashboard panel became a two piece design, which was also much heavier than the previous one piece panel owing to a change in material. Finally, the memory lever on the steering column was removed. In short, a plethora of the changes for the 1989 and 1990 were from the interior.

1991–1992 Toyota Supra 3.0i (MA70)

For the 1991 model year, the wheel design was changed to 5-spoke wheels. Both models had 16x7 aluminum alloy wheels that were fitted with 225/50/16 tyres and full-sized spares on steel wheels. Body molding changed in colour to better match the exterior. The front "Supra" emblem was also changed to the current corporate oval Toyota symbol was used from this model year onwards. The speedometer was also revised, and included more lines that were removed in 1989, but still did not have as many (one line per mph) as 1986.5 to 1988 models. New interior colours, namely shadow gray and deep red, were introduced, which marked the end of medium gray, tan and burgundy. Blue interior became only available on white packages, and those with blue paint. Burgundy was replaced with white package-only deep red. Every other body colour received a shadow gray interior, with leather interiors retaining medium gray seats and interior inserts. Front speakers were changed from 3.5 inch to 6.5 inches and the speaker cover was also enlarged to accommodate them. Beginning in 1991, Toyota began to offer a factory spoiler-style panel sunroof. These sunroofs are now highly sought after and rare since they were introduced in the ending production years of the A70 Supra.

1992 Toyota Supra with sunroof (MA70)

For the 1992 model year, the leather shadow gray interiors received black seats and inserts. Non-turbo models lost the option of a targa top, and a new optional subwoofer was available. Subwoofer-equipped Supras did without the rear bins and wooden "floorboard". Instead, rear carpet was molded to the spare tire, and there was a cut-out for the woofer housing.

The Japanese models of the Supra were given the chassis codes JZA70 and GA70 respectively. The JZA70 has a 2.5-litre 206 kW (276 hp; 280 PS) parallel twin-turbocharged 1JZ-GTE engine, and the GA70 has a 2.0-litre 154 kW (207 hp; 209 PS) twin-turbocharged 1G-GTE and a naturally aspirated 1G-GEU engines respectively.

In addition to the introduction of the JZA70 in 1990, Toyota introduced a special version of the JZA70 with the 1JZ-GTE engine known as the 2.5 Twin Turbo R model (JZA70-R). It boasted additional upgrades, including lighter sway bars, a larger intercooler, Torsen differential, Interbred TEIN/Bilstein sports suspension, Shadow/Dark grey interior trim, MOMO steering wheel and gear knob and Recaro seats and door trim. The wheels were painted charcoal grey, and the front bumper lip featured channeled air ducts for the front brakes. The Twin Turbo R introduced a new and exclusive colour option in 1992 for JZA70-R models known as Jade Mica Green. The JZA70-R model is the lightest and fastest model of third generation of the Supra.

The Turbo-A was Toyota's evolution model for the Group A Japanese Touring Car Championship (JTCC) all over the world that required a minimum homologation run of 500 units. The Turbo-A was manufactured for 2 months during the period of September and October 1988 and was available strictly in Japan. Thus the term 88 Spec A. Some notable differences between the standard MA70 Supra 3.0 GT and the Turbo-A model are both cosmetic and mechanical. The standard CT-26 turbo had a slightly larger inducer and can be identified by a stamped "E" on the raised casting on the compressor housing. The Turbo-A had a 65 mm (2.6 in) wide throttle body and accompanied a larger diameter "blank" crossover pipe, instead of the standard 7M-GTE 60 mm (2.4 in) throttle body and original "3000" cast pipe. The Turbo-A also benefited from a larger volume steel air cleaner instead of the factory plastic unit, as well as thicker roll bars and ventilated brake discs all-round.

The fuel management used a MAP system, instead of the standard Karmen Vortex AFM. The front nose features an additional "Turbo A duct" to add airflow to the top area of the intercooler. Also unique was the side decal and rear badging ("3.0GT Turbo A") and a black paint job (paint code 202). All cars came standard with grey leather interior featuring a MOMO-sourced steering wheel and shift knob. It is powered by a 204 kW (274 hp; 277 PS) Toyota 7M-GTEU engine. It is important to note that the 7M-GTEU was standard in all Japanese MA70 models and is not unique to the Turbo-A. The "U" designation meant the engine came equipped with a catalytic converter as per Japan emission laws.

Toyota Supra MA70 Group-A in 1991 at Bathurst

The Group-A MA70 Supra had varying degrees of success in various fields such as Rally and 24HR, but is most known for its participation in the Japanese Touring Car Championship (JTCC). In the JTCC, the Supra did not win as many races as intended, which is primarily judged on the fact it was underdeveloped and its placement in a higher tier division under regulations because of the 3.0-litre engine displacement, imposing the Toyota with the performance inhibition of running with a higher curb weight and less power compared to the rest of its class. Both the TOM'S and SARD teams fared well in results in the (JTCC) with the TOM'S team winning on its debut in 1987, before abruptly ending their (JTCC) career with the MA70 Group-A in 1989. Upon its initial Australian Touring Car Championship (ATCC) debut in 1989, the Group-A Supra failed to finish its first race. With DNF's becoming a regular upset owing to the lack of power and heavy weight of the Supra, it began to strike doubt in the car's capability of success in the (ATCC) which suffered increasingly due to constant rules and regulation changes issuing a red-faced outcome against its main rivals like the Ford Sierra Cosworth RS500, Nissan Skyline HR31 GTS-R and the BMW M3 (E30) which were lighter, more powerful, and had smaller displacement engines. Hopes would further diminish for Toyota in the top division by the introduction of the domineering Nissan Skyline GT-R (R32) in the (JTCC) in 1989 and the Australian Touring Car Championship (ATCC) in 1990. Toyota in 1991 would switch to racing the Corolla Levin instead in the lower tier divisions, while many privateer teams soldiered on with the Supra until the Group A racing's final demise in 1993. Only eleven MA70 Group-A cars were built by TRD Japan for homologation racing. A few out of many special developed parts that were fitted to the various Group-A race cars happen to include a cast magnesium nine litre oil pan with matching high flow oil pump, 288 camshafts with 10.88mm lift, Hollinger close proportion 5-speed gear-set in the R154 case, Harrop 4 piston brake calipers with 15.5-inch (393 mm) rotors, and TRD-sourced torque-vectoring mechanical limited-slip differential with 50:50 left:right lockup on full throttle. TRD was also responsible for the thick rear-anti squat tram-rods which were integral to the multi-link rear suspension setup to control rear squat under hard acceleration and launching.