BHP+60 hp (18%)
Standard
340 hp
Tuned
400 hp
Torque+130 Nm (29%)
Standard
450 Nm
Tuned
580 Nm
Suitability
Moderate (5.5/10)Gains Profile
Torque-focusedHeadroom
HighBMW 8 Series 840i 340hp ECU Remapping
Considering an ECU remap for your BMW 8 Series 840i 340hp? A Stage 1 remap can take this 2019 -> petrol engine from 340 BHP to 400 BHP and from 450 Nm to 580 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 8 Series can achieve.
How this engine compares
- 5thof 7 BMW 8 Series engines by power gain
- 86%of the 9,842 engines we hold gain data for see a smaller power increase
- 89%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 840i 340hp is a 3.0L naturally aspirated petrol engine producing 340 BHP and 450 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 400 BHP and 580 Nm — a gain of around 60 BHP (18%) and 130 Nm (29%).
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 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.. 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.. 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.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.