Mercedes S 320 CDI (3.0) 235 hp — Stage 1 file (+30 hp)

or choose step by step
1
Choose a vehicle type

Chip tuning for Mercedes S 320 CDI (3.0) 235 hp ECU

Mercedes S (2005 - W221) 320 CDI (3.0) 235 hp — premium diesel engine of the passenger segment of the Mercedes-Benz Group AG (Mercedes-Benz, AMG, Maybach, Smart, EQ) group (Германия, 1926). Stage 1 chip tuning raises power from 235 to 265 hp (+30 hp, +13%) and torque from 540 to 600 Nm (+60 Nm). ECU — Bosch EDC16CP31. Flashing method: OBD or Bench depending on the unit's protection. Diesel engines built in 2005 — the era of classic Common Rail without strong encryption.

AMG is the performance division of Mercedes (since 1967), building engines on the 'one man, one engine' principle in Affalterbach. Mercedes is one of the most protected brands in the chip tuning industry in terms of encryption. Maybach is Mercedes's ultra-luxury sub-brand. On older Mercedes diesels, Stage 1 is flashed over OBD with no complications. Mercedes diesels are known for smooth, quiet running, a hallmark of the premium segment. Mercedes diesels have long been known for legendary reliability, with German taxi fleets running to million-kilometre mileages.

In the Mercedes commercial segment, Stage 1 focuses on torque. The AMG community is active in Germany, but the protection is the toughest in the industry, so Stage 1 on AMG usually requires Bench. Stage 1 on Mercedes often requires refreshing the adaptations after the flash. High-output Mercedes engines are premium-class with solid headroom for Stage 1. On modern high-output Mercedes, Bench reading is often required because of the encryption. The Mercedes premium segment is a high-output platform with Stage 2 potential.

Frequently asked questions

What is the Stage 1 effect on the Mercedes S 320 CDI (3.0) 235 hp?

Stage 1 chip tuning on the Mercedes S 320 CDI (3.0) 235 hp boosts engine output by 30 hp: from 235 to 265 hp. Torque rises from 540 to 600 Nm (+60 Nm).

What changes in the Mercedes S ECU after Stage 1?

Stage 1 is a software optimization of the factory ECU firmware of the Mercedes S with no hardware changes. The injection, boost, ignition-timing and torque maps are reprogrammed. The gain is +30 hp with no hardware changes.

Do you need hardware changes for Stage 1 on the Mercedes S?

Stage 1 on the powerful Mercedes S 320 CDI (3.0) 235 hp “lifts” the factory limiters with no hardware changes. The gain is noticeable in the mid and upper range. There is headroom left for moving to Stage 2 (downpipe + intake + intercooler).

What is Stage 2 for the Mercedes S 320 CDI (3.0) 235 hp?

Stage 2 for the Mercedes S 320 CDI (3.0) 235 hp is Stage 1 plus hardware changes: a downpipe, a larger intake and a performance intercooler. The gain is considerably higher, but it requires professional component selection.

What ECU platform does the Mercedes S 320 CDI (3.0) 235 hp use?

The Mercedes S 320 CDI (3.0) 235 hp is fitted with the Bosch EDC16CP31 ECU. The read method depends on the unit's protection: OBD, Bench via BDM, or Boot mode.

Does the factory warranty of the Mercedes S remain valid after Stage 1?

After remapping the Mercedes S, the official factory warranty on the engine and gearbox is lost (this applies to any manufacturer when the ECU is modified). CHIPOK guarantees the quality of the calibration and free revisions.

How long is the wait for a Stage 1 remap for the Mercedes S?

Reading and writing via OBD takes 25-30 minutes on the Mercedes S. Bench reading (BDM/JTAG) takes about 60 minutes plus refitting. Remote file processing at CHIPOK takes 5-30 minutes.

How do you roll back to the factory firmware of the Mercedes S?

Before Stage 1 the original of the Mercedes S 320 CDI (3.0) 235 hp is read out and saved — returning to the factory state is possible at any time.

How much does chip tuning the Mercedes S 320 CDI (3.0) 235 hp cost?

The remap price for the Mercedes S 320 CDI (3.0) 235 hp is dynamic and is calculated in the CHIPOK calculator based on the selected options. A credit-based payment model, with no subscription fees.

Last updated: 31.08.2026 · Source: manufacturer technical documentation · Measurements: CHIPOK dyno