Mercedes-Benz SL (R231) 2012> SL500 BiTurbo 428bhp remap figures
Thinking of remapping a Mercedes-Benz SL SL500 BiTurbo 428bhp? The standard car makes 428bhp and 700Nm; with a Stage 1 remap from our Leicester workshop we expect around 515bhp and 791Nm, up to +87bhp and +91Nm.
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 | 428 bhp | 515 bhp | +87 bhp |
| Torque | 700 Nm | 791 Nm | +91 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 428 bhp | 700 Nm | |
| Stage 1Maximum software-only performance | 515 bhp | 791 Nm | +87 bhp +91 Nm |
| Stage 1 EcoPerformance with economy in mind | 493 bhp | 784 Nm | +65 bhp +84 Nm |
| Eco mapEconomy first | 486 bhp | 779 Nm | +58 bhp +79 Nm |
Who is the Stage 1 map for?
- Drivers who want a noticeably quicker car from a software-only change, with no new parts.
- Daily drivers who want stronger mid-range pull and a sharper throttle.
- Anyone who wants the biggest gain we list without fitting hardware.
What this means for your SL
On a turbocharged petrol engine a remap adjusts boost, ignition timing and fuelling together, so both power and mid-range torque rise and the car pulls harder out of corners and junctions.
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 SL SL500 BiTurbo 428bhp?
We expect 515bhp and 791Nm against 428bhp and 700Nm as standard: up to +87bhp and +91Nm. 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 SL SL500 BiTurbo 428bhp?
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: 493bhp and 784Nm expected. The Eco map is economy first: 486bhp and 779Nm. Both still sit above the standard 428bhp and 700Nm.
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 SL figures
Other petrol variants
- 500 448bhp 2014>
- 400 361bhp 2016>
- 400 328bhp 2014>
- SL63 AMG BiTurbo 537bhp 2012>
- SL63 AMG BiTurbo PP 577bhp 2012>
- SL65 AMG 621bhp 2012>
All petrol SL (R231) variants · SL (R231) 2012> overview · All Mercedes-Benz figures