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 BMW 340i is one of the strongest all-round petrol saloons of its generation, so Stage 1 is about improving response and mid-range surge rather than changing the car's character. It responds well when the calibration is matched to the exact ECU and fuel quality.
Vehicle specification
| Vehicle | BMW 340i |
| Generation | F30 / F31 |
| Engine | 3.0-litre turbocharged straight-six petrol |
| Factory power | 326 bhp (typical) |
| Factory torque | 450 Nm (typical) |
| Typical Stage 1 power | 380–410 bhp (vehicle-dependent) |
| Typical Stage 1 torque | 520–560 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 to make the 340i more responsive and more urgent in the mid-range while keeping daily use intact.
Expected power and torque
Typical Stage 1 numbers are 380–410 bhp and 520–560 Nm, subject to ECU version, fuel quality and vehicle condition.
What we check first
We confirm spark health, cooling system condition, boost control and any stored faults before programming.
Known vehicle-specific considerations
- The B58 responds best to premium fuel.
- Cooling health matters on turbo petrol cars.
- If the car has prior modifications, we verify the file state before tuning.
Frequently asked questions
Is the BMW 340i a good Stage 1 car?expand_more
Yes. It has strong factory hardware and good tuning headroom.
Do I need premium fuel?expand_more
Yes, premium fuel is strongly recommended.
Can you tune the gearbox?expand_more
If supported, yes, but it is optional.
Is the remap reversible?expand_more
Yes.
Related services
Get a quote for your BMW 340i F30 Stage 1 Remap
Tell us about your vehicle and we'll provide a tailored quote with expected figures.