Mercedes S 5.5i 388 hp — Stage 1 file (+12 hp)
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Stage 1 file for Mercedes S 5.5i 388 hp
Target +0 hp. Custom development for your engine.
Chip tuning for Mercedes S 5.5i 388 hp ECU
Mercedes S (2005 - W221) 5.5i 388 hp — premium petrol 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 388 to 400 hp (+12 hp, +3%) and torque from 530 to 550 Nm (+20 Nm). ECU — Bosch ME9.7. Flashing method: OBD or Bench depending on the unit's protection. A petrol engine built in 2005 — the era before widespread firmware encryption, OBD flash without complications.
Maybach is Mercedes's ultra-luxury sub-brand. Mercedes-Benz is the world's oldest carmaker, founded in 1926 by the merger of Daimler-Motoren-Gesellschaft and Benz & Cie. The Mercedes slogan is 'Das Beste oder nichts' ('The best or nothing'). Mercedes encryption is among the toughest in the industry, especially on modern models. Top AMG engines offer significant potential with a downpipe + intake. AMG is Mercedes's performance division (since 1967), acquired by Mercedes in 1999.
Stage 1 on Mercedes often requires refreshing the adaptations after the flash. Mercedes is one of the most protected brands in the chip tuning industry in terms of encryption. The Mercedes community in Europe has a large pool of available Stage files for the standard models. Bench reading is a mandatory procedure for modern AMG models. Top AMG engines sit at the Mercedes power ceiling, and the gain is significant. AMG engines are a well-known base once hardware is added (downpipe + intake + intercooler). Brabus is a premium alternative to AMG for the top models.
Frequently asked questions
How many horsepower does the Mercedes S 5.5i 388 hp reach after a remap?
Stage 1 for the Mercedes S 5.5i 388 hp adds +12 hp — power increases from 388 to 400 hp (+3%). Torque rises from 530 to 550 Nm (+20 Nm).
What does a Stage 1 remap of the Mercedes S 5.5i 388 hp include?
Stage 1 chip tuning of the Mercedes S is a rework of the ECU maps: boost pressure, ignition advance, target lambda and the removal of factory torque limiters. The gain is +12 hp with no hardware changes.
What is the Stage 1 potential of the Mercedes S 5.5i 388 hp?
On the top-spec Mercedes S 5.5i 388 hp engine, Stage 1 is the starting point before Stage 2 with a downpipe, intake and a larger intercooler. The mass-market factory calibration leaves substantial headroom for an aggressive software tune.
How much does Stage 2 add on the Mercedes S?
Stage 2 for the Mercedes S 5.5i 388 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.
Which ECU is fitted to the Mercedes S 5.5i 388 hp?
The Mercedes S 5.5i 388 hp ECU is the Bosch ME9.7. Production versions support OBD access; locked variants require Bench (BDM/JTAG).
What happens to the Mercedes S warranty after chip tuning?
The factory warranty of the Mercedes S does not remain valid after Stage 1 — the manufacturer withdraws its obligations once the ECU software is changed. CHIPOK provides its own warranty on its work and support.
How long does remapping the Mercedes S take?
On the Mercedes S 5.5i 388 hp: OBD flash 25-30 minutes, Bench (if required) about an hour. The file processing itself takes 5-30 minutes once the original bin is received.
Is the original file kept when chip tuning the Mercedes S?
Yes, the original ECU firmware of the Mercedes S 5.5i 388 hp is kept and can be flashed back at any time. Returning to stock via OBD takes 25-30 minutes.
What is the price of a Stage 1 remap for the Mercedes S?
Stage 1 for the Mercedes S 5.5i 388 hp is paid for with CHIPOK credits (1 cr = 1 €). The final amount is set in the calculator, taking the extra options (off functions) into account.