BHP+80 hp (25%)
Standard
320 hp
Tuned
400 hp
Torque+120 Nm (18%)
Standard
680 Nm
Tuned
800 Nm
Suitability
Good (7.5/10)Gains Profile
Power-focusedHeadroom
HighBMW 8 Series 840d 320hp ECU Remapping
Considering an ECU remap for your BMW 8 Series 840d 320hp? A Stage 1 remap can take this G15 - 2018 -> diesel engine from 320 BHP to 400 BHP and from 680 Nm to 800 Nm of torque (turbocharged). This engine scores 7.5/10 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
- 3rdof 7 BMW 8 Series engines by power gain
- 95%of the 9,842 engines we hold gain data for see a smaller power increase
- 87%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 320hp is a 3.0L turbocharged diesel engine producing 320 BHP and 680 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 400 BHP and 800 Nm — a gain of around 80 BHP (25%) and 120 Nm (18%).
This engine scores highly for remap suitability, with gains weighted towards peak power — the improvement is most noticeable at higher RPM. The tuning headroom is classified as high, based on the percentage gain available from the factory output.
From a technical perspective, the ECU is typically a Bosch EDC17 (likely), and 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: High tuned torque: check transmission torque capacity and service history.
Fuel economy note: possible improvement with conservative driving.
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
!High tuned torque: check transmission torque capacity and service history.