BHP+40 hp (13%)
Standard
320 hp
Tuned
360 hp
Torque+90 Nm (12%)
Standard
730 Nm
Tuned
820 Nm
Suitability
Good (6/10)Gains Profile
BalancedHeadroom
MediumMercedes-Benz S 420 CDI 320hp ECU Remapping
Considering an ECU remap for your Mercedes-Benz S 420 CDI 320hp? A Stage 1 remap can take this W221 - 2005 - 2013 diesel engine from 320 BHP to 360 BHP and from 730 Nm to 820 Nm of torque (turbocharged). This engine scores 6/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your Mercedes-Benz S can achieve.
How this engine compares
- 27thof 43 Mercedes-Benz S engines by power gain
- 63%of the 9,842 engines we hold gain data for see a smaller power increase
- 74%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The Mercedes-Benz S 420 CDI 320hp is a 4.0L turbocharged diesel engine producing 320 BHP and 730 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 360 BHP and 820 Nm — a gain of around 40 BHP (12%) and 90 Nm (12%).
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 moderate, based on the percentage gain available from the factory output.
Considerations: High tuned torque: check transmission torque capacity and service history.. Older diesel: injector, turbo and intake condition can affect results; ensure maintenance is up to date.
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.
!Older diesel: injector, turbo and intake condition can affect results; ensure maintenance is up to date.