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MelloBoy
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All MA70's in Japan were stamped as follows:
MA70-XXXXXXX
As all 7M supras in Japan were TURBO (there were no 7M-GE supras in Japan), there was no need to stamp MA71 on the firewall.
MA71 was coded because the supra came in both 7M-GE and 7M-GTE variants. Some statements made by other people in this thread have led me to believe that stamping on the firewall was done in Japan for the US models but also by their respective countries that they were sold such as Australia. I apologize for the false statement.
Here are comprehensive specs for the MA70/71. All years are the same unless otherwise updated in the later year specs. Some years may overlap:
1986.5 (never released in the US) - 1988.5
7MGTE
Combustion Chamber: Pentroof style
Engine Displacement: 2.954L
Bore x Stroke: 83.0mm x 91.0mm
Compression Ratio: 8.4:1
Max HP:
Max Torque:
Engine Size: 817mm(l) x 665mm(w) x 688mm(h)
Long Block Weight: 207kg
Transmission
AUTO
Transmission Code: A340E
Transmission type: Electronically Controlled Transmission
Gear ratio: 1st-2.805, 2nd-1.531, 3rd-1.000, O/D-0.705
MANUAL
Manual transmission was not produced in the first run of MA71's. They were available only for the GA70.
Suspension
FRONT
Spring rate: 5.3kg/mm
Swaybar diameter: 27mm
REAR
Spring rate: 2.6kg/mm
Swaybar diameter: 19mm
Brakes
Brake Booster size: 8" + 9" tandem
Master Cylinder inner diameter: 25.4mm
FRONT
Caliper Code: AD60
Cylinder diameter: 60mm
Brake pad surface area: 50cm^2
Disc Rotor type: ventilated
Rotor measurements: 277mm(d) x 22mm(w)
REAR
Caliper Code: AD38
Cylinder diameter: 38mm
Brake pad surface area: 36.6cm^2
Disc Rotor type: Ventilated
Rotor measurements: 291mm(d) x 18mm(w)
1987-1988.5
Clutch
Type: Oil pressure based diaphram type clutch
Clutch Cover size: 240mm
Clutch Disc dimensions(outer diameter x inner diameter x thickness): 240mm x 160mm x 3.5mm
Clutch Disc surface area: 251cm^2
Clutch Pedal stroke: 145mm
Transmission
MANUAL
Transmission Code: R154
Gear ratio: 1st-3.251, 2nd-1,955, 3rd-1.310, 4th-1.000, 5th-0.753
1988.5-1989.5
7MGTE
Max HP:
Max Torque:
Engine Size:845mm(l) x 665mm(w) x 690mm(h)
Long Block Weight: 208kg
Other changes: Increased piston durability via alumite patination of piston surface, engine was ready to use unleaded gasoline, higher torque lower in the powerband
Brakes
FRONT
Rotor measurement: 302mm(d) x 18mm(w)
Wiper: Rear wiper blade is perpendicular to defogger lines at rest.
1989.5-1990.5
Engine Mounts: Chaneged to liquid filled engine mounts
1990-1992
No information at my disposal.
Not quite everything, but alot of the things that make the supra move
Someone please fill me in on the HP and Torque ratings.
Melloboy
MA70-XXXXXXX
As all 7M supras in Japan were TURBO (there were no 7M-GE supras in Japan), there was no need to stamp MA71 on the firewall.
MA71 was coded because the supra came in both 7M-GE and 7M-GTE variants. Some statements made by other people in this thread have led me to believe that stamping on the firewall was done in Japan for the US models but also by their respective countries that they were sold such as Australia. I apologize for the false statement.
Here are comprehensive specs for the MA70/71. All years are the same unless otherwise updated in the later year specs. Some years may overlap:
1986.5 (never released in the US) - 1988.5
7MGTE
Combustion Chamber: Pentroof style
Engine Displacement: 2.954L
Bore x Stroke: 83.0mm x 91.0mm
Compression Ratio: 8.4:1
Max HP:
Max Torque:
Engine Size: 817mm(l) x 665mm(w) x 688mm(h)
Long Block Weight: 207kg
Transmission
AUTO
Transmission Code: A340E
Transmission type: Electronically Controlled Transmission
Gear ratio: 1st-2.805, 2nd-1.531, 3rd-1.000, O/D-0.705
MANUAL
Manual transmission was not produced in the first run of MA71's. They were available only for the GA70.
Suspension
FRONT
Spring rate: 5.3kg/mm
Swaybar diameter: 27mm
REAR
Spring rate: 2.6kg/mm
Swaybar diameter: 19mm
Brakes
Brake Booster size: 8" + 9" tandem
Master Cylinder inner diameter: 25.4mm
FRONT
Caliper Code: AD60
Cylinder diameter: 60mm
Brake pad surface area: 50cm^2
Disc Rotor type: ventilated
Rotor measurements: 277mm(d) x 22mm(w)
REAR
Caliper Code: AD38
Cylinder diameter: 38mm
Brake pad surface area: 36.6cm^2
Disc Rotor type: Ventilated
Rotor measurements: 291mm(d) x 18mm(w)
1987-1988.5
Clutch
Type: Oil pressure based diaphram type clutch
Clutch Cover size: 240mm
Clutch Disc dimensions(outer diameter x inner diameter x thickness): 240mm x 160mm x 3.5mm
Clutch Disc surface area: 251cm^2
Clutch Pedal stroke: 145mm
Transmission
MANUAL
Transmission Code: R154
Gear ratio: 1st-3.251, 2nd-1,955, 3rd-1.310, 4th-1.000, 5th-0.753
1988.5-1989.5
7MGTE
Max HP:
Max Torque:
Engine Size:845mm(l) x 665mm(w) x 690mm(h)
Long Block Weight: 208kg
Other changes: Increased piston durability via alumite patination of piston surface, engine was ready to use unleaded gasoline, higher torque lower in the powerband
Brakes
FRONT
Rotor measurement: 302mm(d) x 18mm(w)
Wiper: Rear wiper blade is perpendicular to defogger lines at rest.
1989.5-1990.5
Engine Mounts: Chaneged to liquid filled engine mounts
1990-1992
No information at my disposal.
Not quite everything, but alot of the things that make the supra move
Melloboy