BMW 4.4 T V8 X50I Remap & Chiptuning – 550i, 750i, X5 xDrive50i

Professional ECU tuning and remapping for the BMW 4.4 T V8 X50I petrol engine. Our dyno-tested Stage 1 and Stage 2 calibrations sharpen throttle response and power delivery, with options such as Pop & Bang, GPF/OPF off and limiter changes for supported ECUs.

Engine codes: N63B44

Fitted to 550i750iX5 xDrive50i

+74 hp Best Stage 1 power gain

+137 Nm Best Stage 1 torque gain

1 ECU variant covered

Petrol Fuel type

Performance Gains (Dyno-Tested)

Engine	Stock	Tuned	HP Gain	Torque Gain	ECU	Order
4.4 T V8 X50I	450 hp	524 hp	+74 hp +16%	+137 Nm	MEVD17.2.HStage 1	Order file →

Figures are dyno-tested averages and may vary with hardware condition and fuel quality.

Cars this engine is fitted to

550i, 750i, X5 xDrive50i and BMW 650i

BMW · 4

550i650i750iX5 xDrive50i

Fitment is read from the ECU part numbers in our own database, not from a generic catalogue. The same engine and control unit are fitted to several cars, which is why one page serves them all.

Measured here, tunable everywhere

The figures in the table above are readings taken on the dyno for this engine, not software estimates rounded up to sell a file, and our Stage 1 is calibrated to stay inside the margins the engine was designed with. Only a part of our work is published this way: every ECU, engine and model we can read can be remapped for power, measured page or not.

Available ECU Services for this Engine

The following solutions are supported on the ECU(s) of this vehicle (Petrol):

AGS Removal Cold Start Noise Reduction DTC Removal EVAP Removal Exhaust Flap Removal Immo Removal Lambda Pop&Bang Readiness Calibration Speed Limiter Removal Sport Displays Calibration

Technical Notes per ECU

Disconnection and read requirements differ by ECU. The notes below apply to the specific ECU listed; the exact removal scope per service is confirmed on each service page.

MEVD17.2.H

General FULL READ REQUIRED

Each note is tagged with the service it refers to and applies to the ECU it is listed under. Mechanical preparation is the installer's responsibility. Emission-related solutions are for off-road or motorsport use where permitted by law.

Supported ECU(s): MEVD17.2.H

Frequently Asked Questions

How much power can a BMW 4.4 T V8 X50I gain with Stage 1 tuning?

Stage 1 ECU tuning for the BMW 4.4 T V8 X50I can add up to +74 hp and +137 Nm of torque, based on dyno-tested calibrations. Actual figures depend on the exact engine variant and hardware condition.

Which tuning solutions are available for the BMW 4.4 T V8 X50I?

Supported solutions for the ECU(s) of this vehicle include AGS Removal, Cold Start Noise Reduction, DTC Removal, EVAP Removal, Exhaust Flap Removal, Immo Removal, Lambda and Pop&Bang. Each is applied to your original ECU file; any emission-related solution is intended for off-road or motorsport use where permitted by law.

How do I order and how fast is the tuning file delivered?

Upload your original ECU read through the tuning page and receive the calibration by email. Most files are delivered within 15-20 minutes during working hours (daily, 07:00-23:00 CET).

Is the BMW 4.4 T V8 X50I tuning file plug-and-play?

You receive a ready-to-flash calibration based on your original file. Flashing it back to the ECU and any related mechanical preparation are handled by the installer with their own tools.

Order your BMW 4.4 T V8 X50I tuning file

Upload your original ECU file and receive a professional calibration in 15-20 minutes.

Tune Your File →

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