Expected gains of +59 BHP and +120 Nm torque
Get Your Free Quote ↓Considering an ECU remap for your BMW 1 Series 135i - N55 - twinscroll 306hp? A Stage 1 remap can take this E87 - 2007 - 2011 petrol engine from 306 BHP to 365 BHP and from 400 Nm to 520 Nm of torque (turbocharged). This engine scores 7/10 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 135i - N55 - twinscroll 306hp is a 3.0L turbocharged petrol engine producing 306 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 365 BHP and 520 Nm — a gain of around 59 BHP (19%) and 120 Nm (30%).
This engine has moderate remap suitability, with gains weighted towards torque — you will notice the difference most strongly in mid-range pulling power and in-gear acceleration. 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: Turbo petrol: fuel quality and cooling can influence repeatable performance.. High tuned torque: check transmission torque capacity and service history.. Large torque increase: drivetrain condition (clutch/gearbox) becomes more important at this level.
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 |
|---|---|---|---|---|---|
| 116D 115hp | 115 → 180 | +65 | 260 → 390 | +130 | Excellent (8/10) |
| 116i 122hp | 122 → 135 | +13 | 160 → 185 | +25 | Moderate (4.5/10) |
| 118D 136hp | 136 → 180 | +44 | 300 → 390 | +90 | Excellent (8/10) |
| 118D 143hp | 143 → 180 | +37 | 300 → 390 | +90 | Good (7.5/10) |
| 118i 143hp | 143 → 155 | +12 | 190 → 208 | +18 | Moderate (4/10) |
| 120D 163hp | 163 → 215 | +52 | 340 → 420 | +80 | Good (7.5/10) |
| 120i 170hp | 170 → 185 | +15 | 210 → 230 | +20 | Moderate (4/10) |
| 120D 177hp | 177 → 215 | +38 | 350 → 420 | +70 | Good (7.5/10) |
| 123D 204hp | 204 → 245 | +41 | 400 → 450 | +50 | Good (6.5/10) |
| 125i 218hp | 218 → 250 | +32 | 270 → 310 | +40 | Moderate (4.5/10) |
| 130i 265hp | 265 → 285 | +20 | 315 → 340 | +25 | Moderate (4/10) |
| 135i - N54 306hp | 306 → 362 | +56 | 400 → 510 | +110 | Good (7/10) |
| 1M - 3.0i Bi-turbo 340hp | 340 → 375 | +35 | 500 → 560 | +60 | Good (6/10) |
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.