Mazda RX-7 FC, The Complete Buying Guide

Overview

The second-generation Mazda RX-7 (FC, 1985-1992) represented a significant evolution from the lightweight FB. The FC was larger, heavier, more refined, and, critically, available with turbocharging. Where the FB was a stripped-back sports car, the FC was a grand tourer: comfortable enough for long drives, sophisticated enough for the luxury buyer, yet still sharp enough in the corners to remind you that this was a rotary-powered Mazda.

The FC was produced in naturally aspirated (NA) and turbocharged forms. The NA 13B produces 150hp (112kW), adequate for relaxed driving but not thrilling. The Turbo II model, with its turbocharged 13B producing 200hp (150kW), is the one enthusiasts seek. The Turbo II featured independent rear suspension (IRS), a limited-slip differential, four-wheel disc brakes, and a chassis tuned for serious performance driving.

For the Australian buyer in 2026, the FC Turbo represents exceptional value. Clean Turbo II examples run $15,000-30,000 AUD, far less than the stratospheric FD, while delivering a turbocharged rotary experience with genuine daily-driving capability. The FC is also the most comfortable RX-7 generation for touring, with a well-insulated cabin, effective air conditioning, and available convertible body style.

This guide focuses on the critical inspection points, with particular attention to the turbo model’s complex engine and the FC-specific issues that can turn a bargain into a money pit.

What to Look For

Engine, The Turbocharged 13B

Naturally Aspirated 13B (NA):

• The NA 13B produces 112kW (150hp) and 190Nm of torque. It uses a 4-port induction system and electronic fuel injection. The NA engine is unstressed and reliable, but its performance is uninspiring in the heavier FC body (1,200-1,300kg). If you’re buying an NA FC, you’re buying it for the handling and the rotary experience at a modest pace.
• The NA model uses a simpler, semi-trailing arm rear suspension rather than the Turbo’s IRS. The handling is still good but not on the Turbo’s level.

Turbocharged 13B (Turbo II):

• The Turbo II 13B produces 150kW (200hp) and 265Nm of torque. The turbo transforms the FC’s character, the additional 50hp and 75Nm over the NA model makes the car genuinely fast, with strong mid-range acceleration and a top speed well over 200 km/h.
• The turbo system uses a single Hitachi HT18S turbocharger with a wastegate. Boost is factory-set at approximately 6-7 psi.
• The Turbo II has independent rear suspension (IRS) with an aluminium multi-link design, LSD, and four-wheel ventilated disc brakes. This is a fundamentally more capable chassis than the NA model.

Compression Test, MANDATORY: As with all rotary engines, a warm compression test is essential.

• Healthy 13B (NA or Turbo): 110-130 psi per face, less than 10 psi variation.
• Below 90 psi on any face or more than 15 psi variation: budget for a rebuild ($3,000-5,000 for the turbo variant).
• The turbo engine experiences more thermal stress than the NA, which can accelerate apex seal wear. Turbo cars that have been boost-increased without supporting modifications are at higher risk.

Turbo-Specific Inspection:

• Turbo seals: Smoke on startup (blue-grey smoke for 5-10 seconds after a cold start) indicates worn turbo shaft seals. Oil leaks past the seals when the engine is off and the turbo cools, then burns off when the engine restarts. The turbo can be rebuilt ($500-800) or replaced ($800-1,500).
• Boost control: Check that the car makes proper boost. Factory boost is 6-7 psi, use a boost gauge to verify. Low boost indicates a boost leak, failed wastegate actuator, or failed boost control solenoid.
• Boost creep: If boost continues to rise beyond the target (wastegate not opening properly), the engine is at risk of detonation. This is a serious concern.
• Oil feed and drain lines: The turbo requires clean oil at adequate pressure. Check for leaks at the oil feed banjo fitting (top of turbo) and the oil drain line (bottom of turbo). Blocked or restricted oil lines are the primary cause of turbo bearing failure.

Coolant Seal O-Rings: The FC-era 13B has a well-documented issue with the coolant sealing O-rings between the rotor housings and side housings. These rubber O-rings harden with age and heat cycling, eventually losing their seal. When they fail, coolant leaks into the combustion chamber (white smoke, coolant loss) or leaks externally. The fix requires engine disassembly, and since the engine is apart, a full seal replacement is standard practice. Cost: $3,000-5,000 for a turbo engine rebuild including all seals.

This is the single most important issue to understand when buying an FC. Ask when the coolant seals were last done. If the answer is “never” on a high-mileage car, budget for an engine-out rebuild.

Cooling System

The FC’s cooling system is critical, particularly on the turbocharged model. The turbo generates significantly more heat than the NA engine, and the FC’s original cooling system was barely adequate from new.

• Radiator: Check for corrosion, leaks, and reduced cooling capacity. An aftermarket aluminium radiator is a strongly recommended upgrade ($400-600).
• Turbo coolant lines: The turbo is water-cooled as well as oil-cooled. The coolant lines to the turbo corrode and can leak. Check all connections.
• Electric fans: Both fans must operate. A failed fan in traffic will overheat the turbo engine very quickly.
• Thermostat: Must open at the correct temperature. A stuck thermostat is a quick path to engine damage.

Rust

The FC is better-protected than the FB, but rust still occurs on 30+ year old cars.

Key areas:

• Rear wheel arches: The most common FC rust area. Water gets trapped in the quarter panel area and corrodes from the inside. Check for bubbling paint or filler behind the rear wheels.
• Underbody: Inspect the sills, floor pans, and subframe mounting points from underneath. Surface rust is expected; perforation is a concern.
• Battery tray and surrounding area: Acid vapour corrodes the tray and adjacent structure.
• Convertible-specific: The FC convertible has additional drain channels for the folding roof mechanism. These block with debris and direct water into the body structure. Convertibles require extra scrutiny for hidden rust behind the seats and along the sills.

4th-Port Actuator System

The FC’s 13B uses a 4-port induction system with a variable intake geometry. The 4th port is controlled by a vacuum actuator that opens an additional intake port at higher RPM. The actuator system uses vacuum hoses and a solenoid that can fail with age. Symptoms: reduced high-RPM power, hesitation above 4,500 rpm. Fix: replace vacuum hoses and solenoid. Cost: $50-150. Not a major issue, but worth checking during inspection.

Power Steering

The FC’s power steering pump is a known failure item. Symptoms: whining noise from the pump, heavy steering, fluid leaks. The pump can be rebuilt ($200-400) or replaced with a remanufactured unit ($300-500). Check the power steering fluid for contamination, dark or metallic-looking fluid indicates internal wear.

Climate Control

The FC’s automatic climate control system uses vacuum-operated actuators to control airflow direction and temperature blend. These actuators fail with age, causing the system to default to a single mode (typically defrost). The vacuum lines also crack and leak. Diagnosis requires checking the vacuum system and testing individual actuators. Cost to repair: $200-500 if vacuum lines are the issue, $500-1,000 if actuators need replacement.

Price Guide (Australia, 2026)

Naturally Aspirated

• Project: $3,000-6,000
• Driver: $6,000-10,000
• Good: $10,000-16,000

Turbo II Coupe

• Project (needs engine work or significant rust): $5,000-10,000
• Driver (runs, cosmetic issues, may need turbo attention): $10,000-18,000
• Good (healthy engine, clean body, sorted): $18,000-30,000
• Excellent (low km, documented history): $30,000-45,000

Convertible (NA or Turbo)

• Driver: $8,000-15,000
• Good: $15,000-25,000
• Excellent: $25,000-40,000

Manual Turbo II models command the highest prices. Series 5 (final year, 1992) models with the improved engine management and equipment are the most sought-after.

Running Costs

Fuel: Expect 13-16 L/100km for the NA and 14-18 L/100km for the turbo in mixed driving. Spirited driving with the turbo will push consumption above 20 L/100km. Use 98 RON premium unleaded.

Oil: Change every 5,000 km. The turbo engine requires more diligent oil maintenance, turbo bearing life depends on clean oil at correct levels. Use 10W-40 or 15W-50 semi-synthetic. Oil capacity approximately 4.5-5.0L. Continue to pre-mix two-stroke oil in the fuel.

Parts: Mechanical parts are well-supplied. The FC shares the 13B engine with many Mazda applications, and turbo-specific components are available through rotary specialists. Body and trim parts are becoming scarce. Turbo-specific components (turbo, wastegate, boost control) are available new or remanufactured.

Insurance: Agreed-value policy recommended. Budget $600-1,500/year depending on the agreed value and your driving record.

Annual maintenance budget: $2,000-4,000 for a well-sorted turbo FC in regular use.

Which Variant?

Turbo II coupe with manual transmission is the definitive FC. The turbo engine transforms the car from pleasant to genuinely exciting, the IRS rear end is a significant handling improvement, and the manual gearbox (5-speed) is essential for driver engagement.

The NA model is an acceptable budget option if the turbo is out of reach, but understand that you’re getting a significantly less capable car, less power, simpler rear suspension, and drum rear brakes on some models.

The convertible is desirable for open-air motoring but more rust-prone and heavier. Buy one for summer cruising, not for lap times.

The Verdict

The FC Turbo II is the sleeper of the RX-7 family. While the FD gets the magazine covers and the FB gets the lightweight purist vote, the FC offers the most complete package: turbocharged performance, genuine grand touring comfort, independent rear suspension, and prices that are still accessible.

The critical inspection points are the coolant seals (budget for engine work if they’ve never been done), the turbo condition (a smoking turbo is a $500-1,500 repair), and rust in the rear quarters. A well-sorted FC Turbo II with healthy coolant seals, a good turbo, and a clean body is one of the best-value performance cars available in Australia.

Buy the best Turbo II you can find. Address the cooling system immediately. Pre-mix your fuel. And enjoy a turbocharged rotary sports car that is still, after all these years, a genuinely thrilling machine.