BMW 3 Series (G20) 2020> M340d MH 340bhp Stage 1 Eco remap figures
The Stage 1 Eco map for the BMW 3 Series M340d MH 340bhp (2020>): 398bhp and 797Nm expected from a standard 340bhp and 700Nm, up to +58bhp and +97Nm. It keeps most of the Stage 1 gain (Stage 1 is 417bhp and 805Nm) and is tuned with economy in mind: the choice if you want the performance and care what each tank costs.
Choose your map
Stage 1 Eco remap figures
Stage 1 Eco is performance with economy in mind. It keeps most of the Stage 1 gain, so the car still pulls well, but the map is shaped for efficient, relaxed driving rather than flat-out output. It is above the standard figures. We don't quote mpg, because economy depends on the car and how it is driven.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 340 bhp | 398 bhp | +58 bhp |
| Torque | 700 Nm | 797 Nm | +97 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 340 bhp | 700 Nm | |
| Stage 1Maximum software-only performance | 417 bhp | 805 Nm | +77 bhp +105 Nm |
| Stage 1 EcoPerformance with economy in mind | 398 bhp | 797 Nm | +58 bhp +97 Nm |
| Eco mapEconomy first | 392 bhp | 791 Nm | +52 bhp +91 Nm |
Who is the Stage 1 Eco map for?
- Drivers who want the pull of a remap for overtaking, motorways and towing, with the engine tuned with economy in mind.
- High-mileage drivers who want better performance and a more efficient everyday car in one map.
- Anyone who would otherwise take full Stage 1 but cares what each tank costs.
How Stage 1 Eco compares with Stage 1
Full Stage 1 on this BMW 3 Series is expected to give 417bhp and 805Nm (+77bhp, +105Nm). The Stage 1 Eco keeps about 75% of that power gain and 92% of the torque gain, so you get 398bhp and 797Nm: 19bhp less and 8Nm less than Stage 1, with the map shaped for efficient, relaxed driving, so it suits you if you want the pull and care about running costs. Both sit above the standard 340bhp and 700Nm.
What this means for your 3 Series
Diesel remaps work mainly on boost pressure, fuel delivery and torque limiters, which is why the Nm gain is usually the figure you feel in everyday driving, particularly when overtaking or towing.
The ECU recorded for this variant is a Bosch MD1CP032. 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 Eco questions
How much power does the Stage 1 Eco map give the BMW 3 Series M340d MH 340bhp?
We expect 398bhp and 797Nm against 340bhp and 700Nm as standard: up to +58bhp and +97Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
How does Stage 1 Eco differ from Stage 1 on this engine?
Full Stage 1 is expected to give 417bhp and 805Nm. Stage 1 Eco gives 19bhp less and 8Nm less, in exchange for a map shaped with economy in mind. It still sits above the standard figures.
Is Stage 1 Eco or the Eco map better for me?
Choose Stage 1 Eco if you want the performance (398bhp and 797Nm) and still care about running costs. Choose the Eco map (392bhp and 791Nm) if economy matters more than pace.
Will the Stage 1 Eco map save fuel?
It is tuned with economy in mind while keeping most of the Stage 1 performance. We do not quote mpg figures, because economy depends on the car, its condition and how it is driven.
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 3 Series figures
Other diesel variants
- 330d MH 282bhp 2019>
- 330d 261bhp 2019>
- 320d 187bhp 2019>
- 320d MH 187bhp 2019>
- 320d MH 163bhp 2019>
- 318d 147bhp 2019>
All diesel 3 Series (G20) variants · 3 Series (G20) 2019> overview · All BMW figures