Data under review — The figures shown for this engine variant are currently being verified. They may be updated as we refine our data.
Considering an ECU remap for your BMW 1 Series 135i 306hp? A Stage 1 remap can take this E87 - 2004 - 2007 petrol engine from 306 BHP to 370 BHP and from 400 Nm to 500 Nm of torque (naturally aspirated). This engine scores 5.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 1 Series can achieve.
Comparisons are calculated from our own recorded Stage 1 figures.
The BMW 1 serie 135i 306hp is a 3.0L naturally aspirated petrol engine producing 306 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 370 BHP and 500 Nm — a gain of around 64 BHP (21%) and 100 Nm (25%).
This engine has moderate 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 high, based on the percentage gain available from the factory output.
From a technical perspective, the transmission is many variants use zf 5/6-speed automatics (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.. Unusually high gain for NA engine: treat as an estimate and verify against the exact engine variant.. 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 115hp | 115 → 128 | +13 | 150 → 165 | +15 | Moderate (4.5/10) |
| 118D 122hp | 122 → 155 | +33 | 280 → 340 | +60 | Good (7.5/10) |
| 118i 129hp | 129 → 145 | +16 | 180 → 200 | +20 | Moderate (4.5/10) |
| 120i 150hp | 150 → 165 | +15 | 200 → 220 | +20 | Moderate (4.5/10) |
| 120D 163hp | 163 → 200 | +37 | 340 → 420 | +80 | Good (7.5/10) |
| 130i 265hp | 265 → 285 | +20 | 315 → 340 | +25 | Moderate (4/10) |
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.
