Mercedes-Benz SL (R129) 1998-2002 320 231bhp remap figures
Stock, this 1998-2002 Mercedes-Benz SL petrol (3.2L) produces 231bhp and 271Nm. Our expected figures for a Stage 1 remap are 255bhp and 301Nm, an expected gain of up to 24bhp and 30Nm.
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 | 231 bhp | 255 bhp | +24 bhp |
| Torque | 271 Nm | 301 Nm | +30 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 231 bhp | 271 Nm | |
| Stage 1Maximum software-only performance | 255 bhp | 301 Nm | +24 bhp +30 Nm |
| Stage 1 EcoPerformance with economy in mind | 249 bhp | 299 Nm | +18 bhp +28 Nm |
| Eco mapEconomy first | 247 bhp | 297 Nm | +16 bhp +26 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.
Engine management is by a Bosch ME2.0 unit. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.
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 320 231bhp?
We expect 255bhp and 301Nm against 231bhp and 271Nm as standard: up to +24bhp and +30Nm. 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 320 231bhp?
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: 249bhp and 299Nm expected. The Eco map is economy first: 247bhp and 297Nm. Both still sit above the standard 231bhp and 271Nm.
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
All petrol SL (R129) variants · SL (R129) 1998-2002 overview · All Mercedes-Benz figures