BHP+40 hp (12%)
Standard
340 hp
Tuned
380 hp
Torque+50 Nm (7%)
Standard
700 Nm
Tuned
750 Nm
Suitability
Limited (3.5/10)Gains Profile
Power-focusedHeadroom
LowBMW 8 Series 840d 340hp ECU Remapping
Considering an ECU remap for your BMW 8 Series 840d 340hp? A Stage 1 remap can take this G15 - 2018 -> diesel mhev engine from 340 BHP to 380 BHP and from 700 Nm to 750 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 8 Series can achieve.
How this engine compares
- 7thof 7 BMW 8 Series engines by power gain
- 63%of the 9,842 engines we hold gain data for see a smaller power increase
- 27%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The BMW 8 serie 840d 340hp is a 3.0L naturally aspirated diesel mhev engine producing 340 BHP and 700 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 380 BHP and 750 Nm — a gain of around 40 BHP (12%) and 50 Nm (7%).
This engine has limited remap suitability, with gains weighted towards peak power — the improvement is most noticeable at higher RPM. 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 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.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
!High tuned torque: check transmission torque capacity and service history.