BMW 1 Series (F70) 2024> 123i 204bhp remap figures
Stock, this 2024> BMW 1 Series petrol (2.0L) produces 204bhp and 320Nm. Our expected figures for a Stage 1 remap are 308bhp and 484Nm, an expected gain of up to 104bhp and 164Nm.
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 | 204 bhp | 308 bhp | +104 bhp |
| Torque | 320 Nm | 484 Nm | +164 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 204 bhp | 320 Nm | |
| Stage 1Maximum software-only performance | 308 bhp | 484 Nm | +104 bhp +164 Nm |
| Stage 1 EcoPerformance with economy in mind | 282 bhp | 471 Nm | +78 bhp +151 Nm |
| Eco mapEconomy first | 274 bhp | 463 Nm | +70 bhp +143 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 1 Series
Naturally aspirated petrol engines have no boost to raise, so gains from software alone are more modest than on a turbocharged car and come from fuelling, ignition and throttle response.
Engine management is by a Bosch MG1CS201 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 1 Series 123i 204bhp?
We expect 308bhp and 484Nm against 204bhp and 320Nm as standard: up to +104bhp and +164Nm. 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 1 Series 123i 204bhp?
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: 282bhp and 471Nm expected. The Eco map is economy first: 274bhp and 463Nm. Both still sit above the standard 204bhp and 320Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More BMW 1 Series figures
Other petrol variants
All petrol 1 Series (F70) variants · 1 Series (F70) 2024> overview · All BMW figures