Mercedes-Benz SL (R129) 1998-2002 320 231bhp Stage 1 Eco remap figures
The Stage 1 Eco map for the Mercedes-Benz SL 320 231bhp (1998-2002): 249bhp and 299Nm expected from a standard 231bhp and 271Nm, up to +18bhp and +28Nm. It keeps most of the Stage 1 gain (Stage 1 is 255bhp and 301Nm) and is tuned with economy in mind: the choice if you want the performance and care what each tank costs.
Choose your map
Stage 1 Eco remap figures
Stage 1 Eco is performance with economy in mind. It keeps most of the Stage 1 gain, so the car still pulls well, but the map is shaped for efficient, relaxed driving rather than flat-out output. It is above the standard figures. We don't quote mpg, because economy depends on the car and how it is driven.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 231 bhp | 249 bhp | +18 bhp |
| Torque | 271 Nm | 299 Nm | +28 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 Eco map for?
- Naturally aspirated owners who want a little more response and a more efficient, relaxed drive. Every map we list stays above standard.
- Drivers who want the small gain on offer without chasing peak output.
- Anyone who would otherwise take the full Stage 1 map but wants it tuned with economy in mind.
How Stage 1 Eco compares with Stage 1
Full Stage 1 on this Mercedes-Benz SL is expected to give 255bhp and 301Nm (+24bhp, +30Nm). The Stage 1 Eco keeps about 75% of that power gain and 93% of the torque gain, so you get 249bhp and 299Nm: 6bhp less and 2Nm less than Stage 1, with the map shaped for efficient, relaxed driving, so it suits you if you want the pull and care about running costs. Both sit above the standard 231bhp and 271Nm.
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 Eco questions
How much power does the Stage 1 Eco map give the Mercedes-Benz SL 320 231bhp?
We expect 249bhp and 299Nm against 231bhp and 271Nm as standard: up to +18bhp and +28Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
How does Stage 1 Eco differ from Stage 1 on this engine?
Full Stage 1 is expected to give 255bhp and 301Nm. Stage 1 Eco gives 6bhp less and 2Nm less, in exchange for a map shaped with economy in mind. It still sits above the standard figures.
Is Stage 1 Eco or the Eco map better for me?
Choose Stage 1 Eco if you want the performance (249bhp and 299Nm) and still care about running costs. Choose the Eco map (247bhp and 297Nm) if economy matters more than pace.
Will the Stage 1 Eco map save fuel?
It is tuned with economy in mind while keeping most of the Stage 1 performance. We do not quote mpg figures, because economy depends on the car, its condition and how it is driven.
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