BMW X5 25d Biturbo B47 – Stage 1 – 219 HP → 262 HP / 461 Nm → 542 Nm

The BMW X5 25d model with the B47 biturbo engine is an advanced design that combines high operating refinement with great modification potential.
In this case, we performed the Stage 1 modification while maintaining full thermal safety of the engine and accessories , as the vehicle is used to tow a trailer.

The Bosch EDC17C50 controller allows for very precise calibration of torque, boost pressure, fuel dose and temperature protection parameters – thanks to which we achieved a significant increase in power without the risk of overheating under load.

---

Stage 1 Mod Effects

These gains were achieved while maintaining a safety margin for EGT and coolant temperatures – especially important for vehicles operating under heavy loads (e.g., pulling a caravan, trailer, or construction equipment).

---

Safe calibration for utility applications

The B47 engine in the 25d version is a design with great potential, but when operating under load it is crucial to maintain a stable exhaust gas temperature (EGT) and cooling.

This project used:

• 🧠 optimized torque and boost maps ,

• ⚙️ limiting the maximum values ​​of EGT and torque limiters ,

• 🔥 precisely set SOI and AFR maps for low combustion temperature,

• 📈 boost control as a function of load and rotational speed .

Thanks to this, the engine maintains high dynamics while being resistant to overheating under continuous load.

---

EDC17C50 Controller – BMW Precision Platform

The Bosch EDC17C50 controller used in B47 units offers full control over the combustion process, torque and fuel pressure.
The modification was made based on real logs and data from the Dynomax / Dynomet dynamometer.

The process included:

1. 💻 ECU reading in bench mode,

2. 🔍 log analysis – rail pressure, boost, AFR, EGT, injection corrections,

3. ⚙️ individual Stage 1 calibration with thermal limitations ,

4. 📈 dynamometer testing and validation,

5. 🧩 optimization for long-term operation under load.

---

Effects in practice

• 🚀 noticeably better flexibility at low and medium speeds,

• 🧭 stronger gas response and smooth acceleration,

• 🔧 maintained work culture and durability of accessories,

• 🧊 full thermal control in long load cycles,

• ⛽ no increase in fuel consumption when driving calmly.

This is an example of a professional Stage 1 designed for safe operation in harsh conditions .

---

For tuners and workshops – processing BMW B47 / EDC17C50 files

For cooperating workshops and tuners, we offer professional processing of BMW ECU files , including B47 / EDC17C50 units.

• 💾 Stage 1 / ECO / Custom / Trailer Use files ,

• ⚙️ Individual calibration for HW/SW ,

• 🧠 Log analysis and adjustment of thermal parameters ,

• ⏱️ Completion time: 30–40 minutes ,

• 📊 Validation on Dynomax / Dynomet / Dynoroad dynamometers

We prepare each file manually , taking full account of the payload – without ready-made drivers and presets.

---

Summary

✅ BMW X5 25d B47 Biturbo
✅ ECU: Bosch EDC17C50
✅ Modification: Stage 1 – 262 HP / 542 Nm
✅ Gain: +43 HP / +81 Nm
✅ Measurement: Dynomax / Dynomet dynamometers
✅ Configuration: trailer version, with restrictive thermal limits
✅ Completion time: approx. 40 minutes

---

📩 Do you run a workshop or tune a BMW with a B47 engine?
Order a professional Stage 1 file individually developed for your ECU number, with temperature control and adaptation to the vehicle's operating conditions.