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Mazda RX-7 Technical Specs (FD3S Generation Focus)
Engine and Performance
- 13B-REW Rotary: A twin-rotor engine with a displacement of 1.3L (though it possesses the power stroke frequency of a much larger piston engine), featuring two 654cc rotors.
- Sequential Twin-Turbocharging: Utilizes two Hitachi HT12 turbochargers; the first provides boost at low RPM (1,800–4,000 RPM), while the second pre-spools and kicks in at 4,500 RPM to provide seamless high-end power.
- Output: In its final Japanese iterations, it produced up to 276 hp (280 PS) and 231 lb-ft of torque.
- Thermal Management: Rotaries run significantly hotter than piston engines; the FD utilizes a complex cooling system and oil injection to lubricate the apex seals, which are critical to maintaining compression.
Drivetrain and Chassis
- Transmission: Equipped with a 5-speed manual or a 4-speed automatic; the manual features a short-throw shifter and a synchronized reverse gear.
- Torsen Limited-Slip Differential: Standard on most performance trims, ensuring the high-RPM power is distributed effectively to the rear wheels during cornering.
- Power Plant Frame (PPF): A rigid aluminum beam that connects the transmission to the differential, eliminating independent powertrain twist and improving throttle response.
Chassis and Versatility
- Suspension: A sophisticated four-wheel double-wishbone setup made primarily of aluminum to reduce unsprung weight, providing world-class handling and feedback.
- Braking: Features four-piston front calipers and ventilated discs at all corners, with a specialized ABS system that accounts for the unique deceleration characteristics of a rotary engine.
- Weight Reduction: Engineers utilized thin-gauge steel and aluminum components to keep the curb weight under 2,800 lbs.
Dimensions
- Wheelbase: 95.5 inches (2,425 mm).
- Overall Length: 168.5 inches (4,280 mm).
- Curb Weight: Approximately 2,789 lbs (1,265 kg).
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