BMW 3 Series (G20) 2020> M340d MH 340bhp remap figures
The BMW 3 Series M340d MH 340bhp (2020>) is a diesel 3.0L model making 340bhp and 700Nm as standard. After a Stage 1 ECU remap we expect 417bhp and 805Nm - up to 77bhp and 105Nm more than stock.
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 | 340 bhp | 417 bhp | +77 bhp |
| Torque | 700 Nm | 805 Nm | +105 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 map for?
- Drivers who want stronger pulling power for overtaking, hills and towing, with no parts to fit.
- Daily and motorway drivers who want the engine to feel less strained at cruising speed.
- Anyone who wants the biggest software-only change we list for this engine.
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 questions
How much power does the Stage 1 map give the BMW 3 Series M340d MH 340bhp?
We expect 417bhp and 805Nm against 340bhp and 700Nm as standard: up to +77bhp and +105Nm. 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 3 Series M340d MH 340bhp?
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: 398bhp and 797Nm expected. The Eco map is economy first: 392bhp and 791Nm. Both still sit above the standard 340bhp and 700Nm.
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