Written by Chris Dennis, RemapIQ | Reviewed: 21 August 2026
Vehicle-specific tuning figures vary by ECU, software version, gearbox and hardware. RemapIQ verifies the exact vehicle before programming.
The Focus ST is already a fast hatch, so Stage 1 is about improving the way it delivers power rather than turning it into something entirely different. The 2.3 EcoBoost responds well when the calibration is kept sensible and the car is healthy.
Vehicle specification
| Vehicle | Ford Focus ST 2.3 EcoBoost |
| Generation | Mk4 |
| Engine | 2.3-litre turbo petrol |
| Factory power | 280 bhp (typical) |
| Factory torque | 420 Nm (typical) |
| Typical Stage 1 power | 300–330 bhp (vehicle-dependent) |
| Typical Stage 1 torque | 450–500 Nm (vehicle-dependent) |
| Method | OBD / Bench depending on ECU |
| Price | From £219 — request a quote for exact pricing |
What changes with Stage 1?
We refine boost and torque delivery so the car pulls harder in the mid-range and feels cleaner on throttle. The ST already has good hardware, so the aim is mostly calibration quality.
Expected power and torque
Typical Stage 1 output is 300–330 bhp and 450–500 Nm depending on fuel, ECU version and condition of the car.
What we check first
We confirm coolant health, intake/boost condition, fault memory and fuel quality before tuning.
Known vehicle-specific considerations
- The 2.3 EcoBoost should be run on premium fuel.
- Cooling system health matters on turbo petrol cars.
- If the car has been driven hard, we check for stored heat-related faults before writing.
Frequently asked questions
Does the Focus ST need premium fuel?expand_more
Yes, we recommend 97+ RON fuel after tuning.
Is Stage 1 safe?expand_more
Yes, if the engine is healthy and the tune is not overly aggressive.
Can you tune the gearbox too?expand_more
If supported, yes. It is optional.
Is it reversible?expand_more
Yes.
Related services
Get a quote for your Ford Focus ST 2.3 Stage 1 Remap
Tell us about your vehicle and we'll provide a tailored quote with expected figures.