Considering an ECU remap for your BMW 3 Series M340i 374hp? A Stage 1 remap can take this G2x - 2019 -> petrol engine from 374 BHP to 420 BHP and from 500 Nm to 575 Nm of torque (naturally aspirated). This engine scores 4.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 3 Series can achieve.
The BMW 3 serie M340i 374hp is a 3.0L naturally aspirated petrol engine producing 374 BHP and 500 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 420 BHP and 575 Nm — a gain of around 46 BHP (12%) and 75 Nm (15%).
This engine has limited remap suitability, with a balanced spread of gains across both power and torque — providing a noticeable improvement across the rev range. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.
From a technical perspective, the transmission is many variants use zf 8-speed automatic (where fitted); manuals also exist. at this torque level, transmission and driveline servicing history becomes especially important..
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
| Engine | BHP | Gain | Torque | Gain | Score |
|---|---|---|---|---|---|
| 318d 136hp |
| 136 → 190 |
| +54 |
| 320 → 400 |
| +80 |
| Excellent (8.5/10) |
| 318d 150hp | 150 → 190 | +40 | 320 → 400 | +80 | Excellent (8/10) |
| 318i 156hp | 156 → 260 | +104 | 250 → 420 | +170 | Good (6.5/10) |
| 320d 163hp | 163 → 220 | +57 | 400 → 480 | +80 | Moderate (5.5/10) |
| 320i 184hp | 184 → 250 | +66 | 300 → 440 | +140 | Good (6.5/10) |
| 320i (GPF) 184hp | 184 → 220 | +36 | 290 → 370 | +80 | Moderate (5.5/10) |
| 320d 190hp | 190 → 220 | +30 | 400 → 480 | +80 | Good (7/10) |
| 330e 252hp | 252 → 340 | +88 | 420 → 540 | +120 | Good (6.5/10) |
| 330i 258hp | 258 → 287 | +29 | 400 → 450 | +50 | Moderate (4.5/10) |
| 330d 265hp | 265 → 310 | +45 | 580 → 720 | +140 | Good (7.5/10) |
| 330d 286hp | 286 → 330 | +44 | 650 → 720 | +70 | Moderate (4.5/10) |
| 330e Hybrid 292hp | 292 → 400 | +108 | 420 → 700 | +280 | Good (6.5/10) |
| M340d 340hp | 340 → 380 | +40 | 700 → 750 | +50 | Limited (3.5/10) |
Get a personalised remap quote for your BMW 3 Series. We'll connect you with a trusted professional in your area.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.
We recommend discussing your specific vehicle with a qualified remap professional before proceeding.
