Mercedes SL-Class ECU Remapping & Engine Tuning
We have remap figures for 14 Mercedes SL-Class engines across three generations. Petrol engines gain +3% to +52% power and diesels +11%. The largest bhp increase is on the SL-Class R230 SL350 3.7: 242 to 368 bhp (+126 bhp, +52%). Book your SL-Class in at our Burnley workshop on 01282 779 000, or find a local dealer.
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View FAQs| Generation | Years | Engines | Power gain | Largest gain |
|---|---|---|---|---|
| SL-Class R129 | 2000–2002 | 3 | +3% to +6% | +13 bhp (+6%) Sl280 2.8 |
| SL-Class R230 | 2002–2011 | 9 | +4% to +52% | +126 bhp (+52%) SL350 3.7 |
| SL-Class R231 | 2012–present | 2 | +14% | +62 bhp (+14%) Sl500 4.7 Twinturbo |
| Mercedes SL-Class R129 | Original BHP | Remapped BHP | Original Torque (Nm) | Remapped Torque (Nm) |
|---|---|---|---|---|
| Sl280 2.8 204 BHP 2000-2002 | 204 | 217 (+6%) | 270 | 290 (+7%) |
| Sl 320 3.2 224 BHP 2000-2002 | 224 | 236 (+5%) | 315 | 330 (+4%) |
| Sl 500 5.0 306 BHP 2000-2002 | 306 | 316 (+3%) | 460 | 475 (+3%) |
| Mercedes SL-Class R230 | Original BHP | Remapped BHP | Original Torque (Nm) | Remapped Torque (Nm) |
|---|---|---|---|---|
| SL300 3.0 241 BHP 2002-2011 | 241 | 253 (+4%) | 350 | 369 (+5%) |
| SL350 3.5 311 BHP 2002-2011 | 311 | 329 (+5%) | 360 | 386 (+7%) |
| SL350 3.7 242 BHP 2002-2011 | 242 | 368 (+52%) | 350 | 380 (+8%) |
| Sl 500 5.0 306 BHP 2002-2011 | 306 | 331 (+8%) | 460 | 495 (+7%) |
| Sl 500 5.5 382 BHP 2002-2011 | 382 | 402 (+5%) | 530 | 562 (+6%) |
| Sl55 5.5 470 BHP 2002-2011 | 470 | 512 (+8%) | 700 | 760 (+8%) |
| Sl600 5.5 Twin Turbo 510 BHP 2002-2011 | 510 | 568 (+11%) | 830 | 907 (+9%) |
| Sl63 6.2 518 BHP 2002-2011 | 518 | 540 (+4%) | 630 | 660 (+4%) |
| Sl65 6.0 Twinturbo 604 BHP 2002-2011 | 604 | 656 (+8%) | 1000 | 1072 (+7%) |
| Mercedes SL-Class R231 | Original BHP | Remapped BHP | Original Torque (Nm) | Remapped Torque (Nm) |
|---|---|---|---|---|
| Sl500 4.7 Twinturbo 430 BHP 2012 - Present | 430 | 492 (+14%) | 700 | 802 (+14%) |
| Sl63 5.5 Twinturbo 530 BHP 2012 - Present | 530 | 418 (+-21%) | 800 | 903 (+12%) |
Frequently asked questions
How much power does a remap add to a Mercedes SL-Class?
Petrol engines gain +3% to +52% power and diesels +11%. The full figures for each engine are in the tables above.
How much extra torque does a remap give a Mercedes SL-Class?
Torque gains range from +3% to +14%, an extra 15 to 102 Nm depending on the engine.
Which SL-Class engine gains the most from a remap?
The SL-Class R230 SL350 3.7 gains the most: 242 to 368 bhp (+126 bhp, +52%). Torque rises from 350 to 380 Nm (+8%).
Which SL-Class generations do you have remap figures for?
We have figures for three generations: the SL-Class R129 (2000–2002), SL-Class R230 (2002–2011) and SL-Class R231 (2012–present).
Where can I get my SL-Class remapped?
Book it in at our workshop in Burnley, Lancashire, on 01282 779 000, or find a local remap dealer in our dealer directory.
How we develop your remap
Our remaps are developed in-house at our facility in Lancashire, and cars are developed on our Dynojet 424xLC² dyno. Read more about dyno tuning at BHP UK.
Related:Petrol ECU tuning · Diesel ECU tuning · All Mercedes remaps · Mercedes R-Class · Mercedes S-Class · Mercedes SLC-Class · Mercedes SLK-Class
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