Mercedes-Benz SL (R230) 2009> SL 300 227bhp remap figures
The Mercedes-Benz SL SL 300 227bhp (2009>) is a petrol 3.0L model making 227bhp and 300Nm as standard. After a Stage 1 ECU remap we expect 249bhp and 328Nm - up to 22bhp and 28Nm more than stock.
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 | 227 bhp | 249 bhp | +22 bhp |
| Torque | 300 Nm | 328 Nm | +28 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 227 bhp | 300 Nm | |
| Stage 1Maximum software-only performance | 249 bhp | 328 Nm | +22 bhp +28 Nm |
| Stage 1 EcoPerformance with economy in mind | 244 bhp | 326 Nm | +17 bhp +26 Nm |
| Eco mapEconomy first | 242 bhp | 324 Nm | +15 bhp +24 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 SL
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.
This car is listed with a Bosch ME9.7 engine control unit. 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 SL 300 227bhp?
We expect 249bhp and 328Nm against 227bhp and 300Nm as standard: up to +22bhp and +28Nm. 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 SL 300 227bhp?
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: 244bhp and 326Nm expected. The Eco map is economy first: 242bhp and 324Nm. Both still sit above the standard 227bhp and 300Nm.
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
- SL 350 245bhp 2003>
- SL 500 306bhp 2002>
- SL 350 310bhp 2008>
- SL 500 382bhp 2008>
- SL55 AMG 500bhp 2002-2006
- SL600 Bi-Turbo 500bhp 2003-2006
- SL 600 BiTurbo 509bhp 2006>
- SL600 Bi-Turbo 509bhp 2006>
- SL55 AMG 510bhp 2006-2008
- SL63 AMG 517bhp 2008-2011
All petrol SL (R230) variants · SL (R230) 2002-2011 overview · All Mercedes-Benz figures