BMW · MS43 ECU · petrol

BMW X3 MS43 tuning files

Here is what the catalog holds for the BMW X3 on the MS43. Across the matched variants stock power runs from 231 to 231 HP. On this petrol engine the focus is sharper throttle and useful, repeatable gains. Each file is tied to the precise software on your car and checked before it goes out.

Available solutions

Applicable work for the MS43 on this petrol. The available set firms up once the exact engine and software are known.

Engine variants & ECU software

1 distinct variant for the BMW X3 on the MS43 ECU. Reference the engine and controller software when you upload.

Variant 1

ECU
Catalog engine
3000 231HP
Generation
G01/G08 2017-
Matched gains engine
xDrive 25d 231
Controller brand
SIEMENS
ECU
MS43
Stock power
231 HP
Stage 1 power
270 HP
Power increase
+39 HP (+17%)
Stock torque
500 Nm
Stage 1 torque
550 Nm
Torque increase
+50 Nm (+10%)
SW upgrade
B137B56F
Calibration
B137B56F

Related vehicles

Other vehicles built on the MS43 controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the BMW X3 on the MS43?

Stage 1, Stage 2, Swirl Flaps Off, Lambda / O2, OPF/GPF Off. The exact set depends on the specific engine and software version.

Do you cover the MS43 ECU software on this model?

Yes — the BMW X3 on the MS43 ECU is part of the catalog. Upload your original file and it is matched to the right calibration before any work is done.

How is the file delivered?

Through the TuningBay workflow with operator validation and one safe, sensible result per job. Files we deliver, we stand behind.

BMW X3 MS43 ECU Tuning Files | TuningBay