BHP+20 hp (5%)
Standard
420 hp
Tuned
440 hp
Torque+30 Nm (8%)
Standard
400 Nm
Tuned
430 Nm
Suitability
Limited (3.5/10)Gains Profile
Limited headroomHeadroom
LowBMW M3 4.0 V8 - 420hp ECU Remapping
Considering an ECU remap for your BMW M3 4.0 V8 - 420hp? A Stage 1 remap can take this E90 - 2005 - 2011 petrol engine from 420 BHP to 440 BHP and from 400 Nm to 430 Nm of torque (naturally aspirated). This engine scores 3.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW M3 can achieve.
How this engine compares
- 6thof 8 BMW M3 engines by power gain
- 14%of the 9,842 engines we hold gain data for see a smaller power increase
- 17%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The BMW M3 4.0 V8 - 420hp is a 4.0L naturally aspirated petrol engine producing 420 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 440 BHP and 430 Nm — a gain of around 20 BHP (5%) and 30 Nm (8%).
This engine has limited remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, 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..
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.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
!High tuned torque: check transmission torque capacity and service history.