Data under review — The figures shown for this engine variant are currently being verified. They may be updated as we refine our data.
BHP+64 hp (21%)
Standard
306 hp
Tuned
370 hp
Torque+100 Nm (25%)
Standard
400 Nm
Tuned
500 Nm
Suitability
Moderate (5.5/10)Gains Profile
BalancedHeadroom
HighBMW 1 Series 135i 306hp ECU Remapping
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.
How this engine compares
- 11thof 68 BMW 1 Series engines by power gain
- 89%of the 9,842 engines we hold gain data for see a smaller power increase
- 79%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
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.
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.