Considering an ECU remap for your BMW 1 Series M135i 306hp? A Stage 1 remap can take this F40 - 2019 -> petrol engine from 306 BHP to 335 BHP and from 450 Nm to 500 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 1 Series can achieve.
The BMW 1 serie M135i 306hp is a 2.0L naturally aspirated petrol engine producing 306 BHP and 450 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 335 BHP and 500 Nm — a gain of around 29 BHP (9%) and 50 Nm (11%).
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 |
|---|---|---|---|---|---|
| 116i (1.5T) 109hp |
| 109 → 170 |
| +61 |
| 190 → 300 |
| +110 |
| Excellent (8/10) |
| 116D (1.5D) 116hp | 116 → 150 | +34 | 270 → 330 | +60 | Excellent (8/10) |
| 118i (1.5T) 140hp | 140 → 180 | +40 | 220 → 300 | +80 | Excellent (8/10) |
| 118D (2.0D) 150hp | 150 → 190 | +40 | 350 → 400 | +50 | Excellent (8/10) |
| 120D (2.0D) 163hp | 163 → 220 | +57 | 380 → 440 | +60 | Good (7.5/10) |
| 120i (1.6T) 177hp | 177 → 220 | +43 | 250 → 310 | +60 | Good (7.5/10) |
| 120i (2.0T) 184hp | 184 → 260 | +76 | 290 → 420 | +130 | Excellent (8/10) |
| 120i (2.0T) 184hp (B48B20B) | 184 → 250 | +66 | 290 → 440 | +150 | Excellent (8/10) |
| 120D (2.0D) 190hp | 190 → 220 | +30 | 400 → 440 | +40 | Good (6.5/10) |
| 125i (2.0T) 218hp | 218 → 270 | +52 | 310 → 440 | +130 | Excellent (8/10) |
| 128ti 265hp | 265 → 310 | +45 | 400 → 500 | +100 | Moderate (5.5/10) |
Get a personalised remap quote for your BMW 1 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.
