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MTK Archives · Mazda RX-7 FD
Technicalauto One's FD3S
Power481 HP
Engine13B-REW
TurboTRUST TD07-25…
One’s is a rotary specialist, and this FD3S is its works demo car, built for lap time alone. A TRUST TD07-25G replaced a TO4R because mid-range torque is what makes a lap quick, and the roll cage was cut from twenty points to eleven when that much rigidity proved unnecessary. At 1,080 kg it laps Nikko in 1’02.246.
Car Gallery8 scans
Overview
| Chassis Code | FD3S |
|---|---|
| Trim / Grade | Model IV |
| Drivetrain Layout | FR |
| Vehicle Weight | 1080 kg |
| Concept | Spartan, fully circuit-specification machine built for races at Nikko and Maze |
Engine
| Engine Code | 13B-REW |
|---|---|
| Power | 481 HP |
| Torque | 504 Nm |
| Boost | 1.1 bar |
| Displacement | 1308 cc |
| Throttle Bodies | Big throttle, +4 mm |
| Intercooler | BLITZ 3-layer core with a modified tank, arranged as a V-mount |
Rotary
| Porting | Side port, cut to put peak torque at 3,000–4,000 rpm |
|---|---|
| Apex Seals | Test-spec 3-piece |
| Tension Bolts | New Bolt |
Forced Induction
| Turbo / Turbine | TRUST TD07-25G, in place of the original TO4R |
|---|---|
| Exhaust Manifold | Custom |
Fuel & Ignition
| Injectors | 1000cc |
|---|---|
| Fuel Pump | BOSCH x2 |
| Fuel Pressure Regulator | HKS |
| Spark Plugs | NGK No. 11.5 |
Engine Management
| ECU | HKS F-CON V Pro |
|---|
Exhaust
| Exhaust / Muffler | One-off titanium |
|---|---|
| Piping | Stainless into a titanium front pipe |
Cooling
| Radiator | KOYO one-off aluminium with a modified tank |
|---|---|
| Oil Cooler | HKS 19-row. The left-hand cooler was returned to the stock unit to save weight — the standard one has a thermostat, which suits it just right |
Fluids
| Engine Oil | NUTEC UW02 10W-50 |
|---|
Drivetrain
| Clutch | AP twin-plate |
|---|---|
| Transmission | HKS sequential dog |
| Driveline Notes | LSD and modified final-drive components |
Suspension
| Dampers / Coilovers | One's original |
|---|---|
| Spring Rate (Front) | 16 kg/mm |
| Spring Rate (Rear) | 16 kg/mm |
| Springs | BESTEX front, Swift rear |
| Sway Bars | SARD or stock, chosen to suit the circuit |
| Chassis Bracing | AutoExe front tower bar, CUSCO rear tower bar |
| Suspension Notes | Original full-pillow bushes throughout |
Brakes
| Calipers | Brembo, front |
|---|---|
| Rotors (Front) | 340 mm |
| Rotors (Rear) | 335 mm |
| Pads | ENDLESS |
| Balancer | AP, mounted beside the shift lever — welcome on an FD, which locks its front wheels easily |
Wheels & Tires
| Wheels | RAYS Volk Racing TE37 |
|---|---|
| Wheel Size (Front) | 17" 9.5J ET28 |
| Wheel Size (Rear) | 17" 9.5J ET12 |
| Tires | Yokohama ADVAN A048 |
| Tire Size (Front) | 255/40R17 |
| Tire Size (Rear) | 255/40R17 |
Chassis & Rigidity
| Roll Cage | 11-point — drawn up as a 20-point design and cut back when that much rigidity proved unnecessary |
|---|---|
| Reinforcement | Rear fenders widened in sheet steel, chosen for weight |
Exterior & Aero
| Front Bumper | FreeStyle |
|---|---|
| Side Steps | RE Amemiya |
| Fenders | RE Amemiya front fenders; rear fenders widened in sheet steel |
| Wing / Spoiler | FreeStyle |
| Bonnet / Hood | RE Amemiya |
| Exterior Notes | Doors replaced with RE Amemiya FRP units |
Interior
| Interior Notes | All interior trim removed for weight |
|---|
Performance
| Lap Time | 1'02"24 |
|---|---|
| Circuit | Nikko Circuit |
| Notable History | Laps Nikko Circuit in 1'02.246, at around 1,080 kg — roughly 200 kg lighter than standard. |
Other
| Fuel Cooler | Fitted |
|---|---|
| Brake Reservoir Cap | Gold aftermarket type, which also resists loosening |