BMW 4 Series Gran Coupe (G22) 2021> 430i 254bhp remap figures
Thinking of remapping a BMW 4 Series Gran Coupe 430i 254bhp? The standard car makes 254bhp and 400Nm; with a Stage 1 remap from our Leicester workshop we expect around 308bhp and 484Nm, up to +54bhp and +84Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 254 bhp | 308 bhp | +54 bhp |
| Torque | 400 Nm | 484 Nm | +84 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 254 bhp | 400 Nm | |
| Stage 1Maximum software-only performance | 308 bhp | 484 Nm | +54 bhp +84 Nm |
| Stage 1 EcoPerformance with economy in mind | 295 bhp | 477 Nm | +41 bhp +77 Nm |
| Eco mapEconomy first | 290 bhp | 473 Nm | +36 bhp +73 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your 4 Series Gran Coupe
Without a turbocharger the improvement comes from ignition, fuelling and throttle mapping rather than boost, so expect a smaller but still noticeable change in response.
This car is listed with a Bosch MG1CS201 engine control unit. Newer ECUs often protect their software, so we read the exact unit and version on the car before confirming the figures on this page.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the BMW 4 Series Gran Coupe 430i 254bhp?
We expect 308bhp and 484Nm against 254bhp and 400Nm as standard: up to +54bhp and +84Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the BMW 4 Series Gran Coupe 430i 254bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 295bhp and 477Nm expected. The Eco map is economy first: 290bhp and 473Nm. Both still sit above the standard 254bhp and 400Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
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