400 CDI (4.0) - 250ch Tuning
Mercedes S — Detailed power and torque gains by stage.
Gains by stage(2)
Power
250 hp
Torque
560 Nm
diesel
Power
250→290ch
+40 ch
+16%
Torque
560→630Nm
+70 Nm
+13%
OriginalTuned
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Everything about 400 CDI (4.0) - 250ch tuning
Tuning the 400 CDI (4.0) - 250ch found in the Mercedes S is one of the most popular performance upgrades. This engine offers excellent potential for power and torque gains.
On ChiptuneMAP, find verified gain data for each stage, compare tuner prices and find the ideal professional for your project.
Gains summary by stage
On the Mercedes S 400 CDI (4.0) - 250ch, tuning delivers up to +70 hp and +130 Nm depending on the stage. Stock vs tuned figures:
| Stage | Power | Torque | Indicative price |
|---|---|---|---|
| Stage 1 | 250 → 290 hp | 560 → 630 Nm | — |
| Stage 2 | 250 → 320 hp | 560 → 690 Nm | — |
Frequently asked questions
What gains can I expect from tuning the 400 CDI (4.0) - 250ch?
Tuning the 400 CDI (4.0) - 250ch (Mercedes S) delivers significant power and torque gains depending on the chosen stage. Stage 1, with no hardware modifications, offers the best gain-to-reliability ratio.
Is tuning reliable on the 400 CDI (4.0) - 250ch?
Yes, the 400 CDI (4.0) - 250ch is known for its reliability when tuned, especially at Stage 1. It's essential to use a certified tuner with maps tailored to your engine.
How much does Mercedes S tuning cost?
Prices vary by stage and tuner. Check our directory to compare rates from professionals near you.
Should I get a tuning box or an ECU remap?
ECU remapping (modifying the engine control unit map) delivers better results and integration than a plug-in tuning box. It's customized for each engine.
How do I find a tuner for my Mercedes S?
Use the ChiptuneMAP directory to find a certified tuner near you. Compare reviews, prices and specialties.