BMW Serie 8 ECU remapping
100 files available
About remapping
The BMW 8 Series accounts for 100 files in our catalogue, with the M850i leading, alongside the 840d diesel, the 850i and 840i petrol units and the M8 Competition at the top. It is a large grand tourer with genuine performance credentials.
Stage 1 makes up 84 files, with 19 speed limiter removals, 10 Stage 2 and 5 pop and bang. The ECUs include MG1CS201 and MD1CP002 on the petrol units, plus references for the diesel side. All work starts from the original read of the ECU.
Model highlights
- ›84 Stage 1 files across the petrol and diesel range.
- ›Coverage of the M850i and the M8 Competition.
- ›19 speed limiter removals and 10 Stage 2 files.
- ›ECUs including MG1CS201 and MD1CP002.
Fuel split
Engines and gains
| Engine | Fuel | Stock | Stage 1 | Stage 2 |
|---|---|---|---|---|
| 850 CSI | Petrol | 380 hp | 400 hp +20 | — |
| 850 CI | Petrol | 326 hp | 344 hp +18 | — |
| 40d (3.0) | Diesel | 320 hp | 392 hp +72 | — |
| 850i | Petrol | 300 hp | 320 hp +20 | — |
| 840 CI 4.0l | Petrol | 286 hp | 305 hp +19 | — |
| 840 CI 4.4l | Petrol | 286 hp | 305 hp +19 | — |
Indicative figures from the technical catalogue; confirmed when you request the file.
Power curve
850i
ECUs
Generations covered
ECU manufacturers
Available services
Remapping services
Stage 1
Optimising the original map with no hardware changes: more power and torque, full reliability.
Speed limiter removal
Removal of the factory speed limiter.
Stage 2
Remap for vehicles with mechanical upgrades (intake, exhaust, intercooler…).
Pops & bangs
Pops & bangs exhaust effect (on lift-off and gear changes).
Why remap with Repromatronic
- ✓More power and torque with engine-safe tuning
- ✓Sharper throttle response and nicer driving
- ✓Potential fuel savings in normal driving
- ✓Files built from the original and 100% reversible
- ✓Made by technicians with thousands of projects behind them
Are you a driver?
Request a free quote for your vehicle and we'll tell you the gains you can expect.
Request a quoteAre you a workshop or professional?
Sign up, buy credits and download the optimised file instantly.
Log in as a professionalFrequently asked questions
Do you work on the M8 Competition?
Yes, it is present in our catalogue. Being twin-turbocharged, it offers substantial headroom despite very high factory figures.
Which engine gains most?
The turbocharged petrol units deliver the largest outright gains, while the 840d excels at effortless mid-range torque.
Is the work reversible?
Yes. We always keep the original ECU file, which matters particularly on a car in this segment.