Mercedes-Benz S 420 CDI 320hp Remap

Name: Mercedes-Benz S 420 CDI 320hp ECU Remap
Brand: Mercedes-Benz

Expected gains of +40 BHP and +90 Nm torque

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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

Balanced

Headroom

Medium

Mercedes-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.

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.

Other S W221 - 2005 - 2013 Engines

Engine	BHP	Gain	Torque	Gain	Score
250 CDI 204hp	204 → 230	+26	500 → 560	+60	Good (6/10)
320 CDI 211hp	211 → 260	+49	540 → 600	+60	Good (6.5/10)
320 CDI 235hp	235 → 260	+25	540 → 600	+60	Good (6/10)
350 CDI 235hp	235 → 290	+55	540 → 620	+80	Good (6.5/10)
350 CDI BlueTec 258hp	258 → 300	+42	620 → 700	+80	Good (6/10)
400 Hybrid 299hp	299 → 314	+15	384 → 399	+15	Limited (3.5/10)
450 CDI 320hp	320 → 360	+40	730 → 820	+90	Good (6/10)
500 - 388hp	388 → 408	+20	530 → 570	+40	Limited (3.5/10)
500 Turbo 435hp	435 → 510	+75	700 → 820	+120	Good (6.5/10)
600 V12 Turbo 517hp	517 → 585	+68	830 → 910	+80	Good (6/10)
63 AMG 525hp	525 → 541	+16	630 → 650	+20	Limited (3/10)
63 AMG Turbo 544hp	544 → 590	+46	800 → 900	+100	Good (6/10)
65 AMG V12 Turbo 630hp	630 → 670	+40	1000 → 1100	+100	Moderate (5.5/10)

Technical Specifications

Fuel Type: Diesel
Aspiration: Turbocharged
Displacement: 4L
Capacity: 3996 CC
Type: Car
Engine Family: Mercedes-benz 4.0L CDI Turbo Diesel

ECU & Transmission

Likely ECU Low confidence: Bosch EDC16 / Siemens SID (varies)
Gearbox Low confidence: Transmission varies by trim and market; check manual/automatic type and torque rating. At this torque level, transmission and driveline servicing history becomes especially important.

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MakeMercedes-Benz

ModelS

GenerationW221 - 2005 - 2013

Engine420 CDI 320hp

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 before proceeding.