Mercedes-Benz S Class (W221) 2010-2013 S65L 621bhp remap figures
Thinking of remapping a Mercedes-Benz S Class S65L 621bhp? The standard car makes 621bhp and 1001Nm; with a Stage 1 remap from our Leicester workshop we expect around 675bhp and 1090Nm, up to +54bhp and +89Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 621 bhp | 675 bhp | +54 bhp |
| Torque | 1001 Nm | 1090 Nm | +89 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 621 bhp | 1001 Nm | |
| Stage 1Maximum software-only performance | 675 bhp | 1090 Nm | +54 bhp +89 Nm |
| Stage 1 EcoPerformance with economy in mind | 662 bhp | 1083 Nm | +41 bhp +82 Nm |
| Eco mapEconomy first | 657 bhp | 1078 Nm | +36 bhp +77 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your S Class
Without a turbocharger the improvement comes from ignition, fuelling and throttle mapping rather than boost, so expect a smaller but still noticeable change in response.
The ECU recorded for this variant is a Bosch MED17.7.1. We read the ECU on your car and compare it with the software listed here before any work starts, so you know what to expect before you commit.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the Mercedes-Benz S Class S65L 621bhp?
We expect 675bhp and 1090Nm against 621bhp and 1001Nm as standard: up to +54bhp and +89Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the Mercedes-Benz S Class S65L 621bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 662bhp and 1083Nm expected. The Eco map is economy first: 657bhp and 1078Nm. Both still sit above the standard 621bhp and 1001Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More Mercedes-Benz S Class figures
Other petrol variants
- S65 Bi-Tubro 603bhp 2006-2010
- S63L 544bhp 2010>
- S63L AMG 517bhp 2007-2010
- S600L Bi-Turbo 509bhp 2006>
- S500 382bhp 2006-2011
- S350 268bhp 2006>
- S280 227bhp 2006>
All petrol S Class (W221) variants · S Class (W221) 2006-2013 overview · All Mercedes-Benz figures