Cars / Vans · ECU Remapping
Mercedes S 400 (3.0T) 313 hp Tuning (2021–)
Factory specification and Stage 1 remap gains for the Mercedes S 400 (3.0T) 313 hp (2021–). A Stage 1 calibration adds 167 BHP and 150 Nm — software only, no hardware modifications required.
| Measure | Stock | Stage 1 |
|---|---|---|
Power BHP | 313 | 480 +167 BHP · +53% |
Torque Nm | 450 | 600 +150 Nm · +33% |
+167 BHP
Stage 1 power gain
+150 Nm
Stage 1 torque gain
Rolling road
Dyno Graph
Power (BHP, solid) and torque (Nm, dashed) across engine speed (RPM). Peak figures match our database exactly.
Hover / touch the graph
Stock: 313 bhp · 450 Nm (peak)
Stage 1: 480 bhp · 600 Nm (peak)
Tuning tool compatibility
This ECU is listed in 4 of 4 manufacturer compatibility databases.
AutoTuner
Supported
ECU: Bosch MG1CP002
Alientech KESS3
Supported
ECU: Bosch MG1CP002
Magicmotorsport FLEX
Supported
ECU: Bosch MG1CP002
Dimsport New Genius / New Trasdata
Supported
ECU: Bosch MG1CP002
Existing customers upload their ECU file via the Regal Tuning File Portal. New to Regal? Request a quote first.
About this remap
Mercedes S 400 (3.0T) 313 hp Stage 1 — what changes
The Mercedes S 400 (3.0T) 313 hp (2021–) leaves the factory at 313 BHP and 450 Nm of torque. Manufacturers deliberately detune this engine to separate it from more expensive variants in the range — a Regal Tuning Stage 1 calibration safely recovers that headroom through the ECU alone: no hardware changes, no dyno risk, fully reversible.
Fuelling, boost pressure, ignition and torque limiters are optimised within the safe tolerances of the 400 (3.0T) 313 hp powertrain (petrol). The result is 480 BHP and 600 Nm with factory smoothness, cold-start protection and emissions behaviour retained.
Why Regal Tuning
Verified on the dyno, backed by 20+ years
Every calibration is developed and verified by Regal Tuning on an in-house 4WD dynamometer and proven across a worldwide dealer network. Your file is supplied through the Regal Tuning file portal with full technical support, and the original factory file is always kept so the vehicle can be returned to stock at any time.
Figures shown are for this exact engine variant. Gains depend on vehicle health, fuel quality and conditions — we confirm the expected output for your specific vehicle in writing before work begins.
Mercedes S 400 (3.0T) 313 hp remap FAQ
How much power does Stage 1 add?
Stage 1 takes the 400 (3.0T) 313 hp to 480 BHP and 600 Nm — a gain of 167 BHP and 150 Nm over stock.
Is Stage 1 safe for this engine?
Yes — software-only calibration within the safe mechanical tolerances of the engine, gearbox and drivetrain, developed and verified on our in-house 4WD dyno.
How do I get this remap?
Request a quote with your vehicle details or registration. Existing customers upload their ECU file through the Regal Tuning file portal for a fast turnaround.
20+ years of ECU calibration
Ready to unlock your Mercedes S's real performance?
Tell us your vehicle and registration — we'll confirm support and the exact expected gains for your engine before any work begins.