BMW 3 Series (F3X) 2017> 340i 322bhp remap figures
The BMW 3 Series 340i 322bhp (2017>) is a petrol 3.0L model making 322bhp and 450Nm as standard. After a Stage 1 ECU remap we expect 428bhp and 608Nm - up to 106bhp and 158Nm 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 | 322 bhp | 428 bhp | +106 bhp |
| Torque | 450 Nm | 608 Nm | +158 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 322 bhp | 450 Nm | |
| Stage 1Maximum software-only performance | 428 bhp | 608 Nm | +106 bhp +158 Nm |
| Stage 1 EcoPerformance with economy in mind | 402 bhp | 595 Nm | +80 bhp +145 Nm |
| Eco mapEconomy first | 393 bhp | 587 Nm | +71 bhp +137 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 3 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.
The ECU recorded for this variant is a Bosch MG1CS003. 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 340i 322bhp?
We expect 428bhp and 608Nm against 322bhp and 450Nm as standard: up to +106bhp and +158Nm. 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 340i 322bhp?
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: 402bhp and 595Nm expected. The Eco map is economy first: 393bhp and 587Nm. Both still sit above the standard 322bhp and 450Nm.
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 petrol variants
- 3.0 ActiveHybrid 335bhp 2012>
- 335i 301bhp 2012>
- 330e (B48B20A) 252bhp 2015>
- 330i (B48) 248bhp 2015>
- 328i (N20) 241bhp 2012-2015
- M3 424bhp 2014>
- M3 Competition 443bhp 2014>
- 320i (B48) 181bhp 2015>
- 320i (1.6) 167bhp 2012>
- 318i (1.5) 134bhp 2015>
All petrol 3 Series (F3X) variants · 3 Series (F3X) 2012-2019 overview · All BMW figures