NEW HKS FCD Fuel Cut Defencer Standard Type 4501-RA002 JDM Turbo Boost ECU Japan For Sale - New and Used

HKS Fuel Cut Defencer (FCD) Standard Type (4501-RA002)

OverviewWhen you raise the boost pressure of a turbo car, the factory ECU forces a fuel cut as a safety function to prevent engine damage, causing severe hesitation (bogging) during acceleration. This product is an electronic tuning part that corrects (attenuates) the signal from the pressure sensor (or airflow meter) sent to the factory ECU, allowing smooth acceleration into higher boost ranges without the ECU triggering fuel / Brand: HKS

Product: FCD (Fuel Cut Defencer)

Product Code: 4501-RA002

Type: STD (standard)

Use: fuel-cut release device for engine boost pressure and airflow

Signal type: mainly for pressure sensors (some airflow meters)

Compatible vehicles: Japanese cars (DC 12V negative-earth)

Adjustment: control level via a volume dial (turn left toward cut release)

Wiring (4 wires): red power (+12V) / black earth / white signal input (sensor side) / yellow signal output (ECU side)

Package size / weight: H5.80 × W11.60 × D14.80 cm / approx. 240g

Country of Origin: Made in Japan

Important Notes

• Does NOT add fuel: as a part that "tricks" the ECU, it raises the fuel-cut level but does not increase the fuel injection amount itself.
• Risk of engine damage: excessive boost without adding fuel leans the air-fuel ratio (A/F), risking instant engine destruction (seizure, melted piston) in the worst case.
• Fuel correction recommended: for safe tuning, using an HKS F-CON series sub-computer or fuel controller alongside to add fuel enrichment at the same time is strongly recommended.

Notes for Overseas Buyers

• DC 12V negative-earth Japanese vehicles. Please confirm your car's signal type (pressure sensor / airflow) and compatibility before purchasing.
• IMPORTANT: this does not enrich fuel — improper use risks serious engine damage. Fuel correction (e.g. a sub-computer) is strongly recommended.
• This listing is for the FCD unit only. Instructions, if supplied, may be in Japanese; HKS documentation is generally available in English online.

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